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Sudden and simultaneous population outbreak of Neoaulacoryssus speciosus in an urban area of 12 municipalities in the Caatinga biome

Abstract

The ground beetle, Neoaulacoryssus speciosus (Coleoptera: Carabidae) is of high relevance to field because it has been recorded as a pest of seeds and young plants of vegetables and other crops and a predator in agricultural crops, forest and weeds in Brazil. However, natural habitat changes are increasing agriculture and forest insect outbreaks in urban areas. A N. speciosus population outbreak occurred in October and November 2018 simultaneously in 12 neighboring municipalities at the beginning of the rainy season in the northern region of Minas Gerais State, Brazil. The objectives of this study were to report a sudden and simultaneous population outbreak of N. speciosus and to describe the factors of habitat change that could have contributed to this invasion in 12 municipalities in the northern region of Minas Gerais State in the Caatinga biome of Brazil. In addition, female and male genitals were described and illustrated, the scientific classification revised and common names of N. speciosus listed. Thousands of males and females of N. speciosus agglomerated in shady, humid places during the day and night for about 15 days. Neoaulacoryssus speciosus has been identified and illustrated, its scientific classification revised and four common names listed for this species.

Key words
Carabidae; Genitalia; Ground beetle; Infestation; Insect pest; Invasion

INTRODUCTION

Population outbreaks of carabids (Coleoptera) occur in agricultural, forest and urban areas, with high density of individuals in a short period of time, usually after emergence of their last larval instars or adults from the soil (Eo et al. 2016EO J, KIM MH, BANG HS, CHOI SK, NA YE, CHO KJ, OH YJ, YANG D & PARK S. 2016. Effects of climate and landscape heterogeneity on the distribution of ground beetles (Coleoptera: Carabidae) in agricultural fields. J Asia-Pac Entomol 19(4): 1009-1014., Hammond et al. 2018HAMMOND HEJ, HOFFMAN PGK, PINNO BD, PINZON J, KLIMASZEWSKI J & HARTLEY DJ. 2018. Response of ground and rove beetles (Coleoptera: Carabidae, Staphylinidae) to operational oil sands mine reclamation in northeastern Alberta, a case study. J Insect Conserv 22(5-6): 687-706.). Carabids, with different feeding habits and producing toxic substances, can be predators in agriculture and forests and negatively affect urban areas and health in humans and animals (Raupp et al. 2010RAUPP MJ, SHREWSBURY PM AND HERMS DA. 2010. Ecology of herbivorous arthropods in urban landscapes. Annu Rev Entomol 55(1): 19-38., Tavares et al. 2014TAVARES W DE S, WILCKEN CF, RAMALHO F DE S, LEITE GLD, SERRÃO JE & ZANUNCIO JC. 2014. Defoliation of Terminalia catappa by larvae of Thagona tibialis (Lepidoptera: Erebidae) in Viçosa, Brazil. J Agric Urban Entomol 30(1): 1-11.). Population outbreaks of carabids in urban areas may be related to regional environmental imbalance influenced by factors such as deforestation, reduction in the number of biocontrol agents, agricultural and/or forest crops in monocultures (Queiroz & Garcia 2007QUEIROZ JM & GARCIA MA. 2007. Ambrosia beetles occurrence (Coleoptera: Platypodidae) in Campinas urban area, SP. FLORAM 14(1): 1-5., Albuquerque et al. 2008ALBUQUERQUE HN, LEITE CF, ALBUQUERQUE ICS & CAVALCANTI MLF. 2008. The potós (Paederus sp.) study contribution in two neighborhoods of the city of Campina Grande - PB. BioFar - Rev Biol Far 3(1): 26-37.), and climatic phenomena (Alva-Dávalos et al. 2002ALVA-DÁVALOS V, LAGUNA-TORRES VA, HUAMÁN A, OLIVOS R, CHÁVEZ M, GARCÍA C & MENDOZA N. 2002. Epidemic dermatits by Paederus irritans in Piura, Perú at 1999, related to El Niño phenomenon. Rev Soc Bras Med Trop 35(1): 23-28.).

Neoaulacoryssus speciosus (Dejean) (Coleoptera: Carabidae: Harpalinae) larvae, reported as its synonym Arthrostictus speciosus (Dejean), develop in the soil and their adults live in forest fragments and can move to nearby agricultural and/or urban areas in population outbreaks (Cividanes et al. 2003CIVIDANES FJ, SOUZA V DE P & SAKEMI LK. 2003. Faunal composition of predator insects in forest fragment and area of vegetables in Jaboticabal region, state of São Paulo, Brazil. Acta Sci Biol Sci 25(2): 315-321., 2010CIVIDANES FJ, CIVIDANES TM DOS S & FERRAUDO AS. 2017. Carabid beetle (Coleoptera: Carabidae) abundance and habitat preference in Northeastern São Paulo State, Brazil. Coleopt Bull 71(4): 769-777.). This insect, reported as A. speciosus (Drury), prefers dark environments with high air and soil moisture (da Costa Lima 1952DA COSTA LIMA A. 1952. Insetos do Brasil. 7° Tomo - Coleópteros, 2ª Parte. Escola Nacional de Agronomia, Série didática 9: 263-264.). Adults and larvae of N. speciosus, reported as A. speciosus (Drury), feed on post-sown seeds of pearl millet, Pennisetum glaucum (L.) R. Br. (Poales: Poaceae) and young plants of vegetables and other crops (da Costa Lima 1952DA COSTA LIMA A. 1952. Insetos do Brasil. 7° Tomo - Coleópteros, 2ª Parte. Escola Nacional de Agronomia, Série didática 9: 263-264.). However, necrophagy on carcasses of pigs, Sus L. (Artiodactyla: Suidae) has been reported for this species, reported as A. speciosus (Drury), in Serra Talhada, Pernambuco State, Brazil (Mayer & Vasconcelos 2013MAYER AC & VASCONCELOS SD. 2013. Necrophagous beetles associated with carcasses in a semi-arid environment in Northeastern Brazil: Implications for forensic entomology. Forensic Sci Int 226(1-3): 41-45., de Almeida et al. 2015DE ALMEIDA LM, CORRÊA RC & GROSSI PC. 2015. Coleoptera species of forensic importance from Brazil: An updated list. Rev Bras Entomol 59(4): 274-284.) and a predatory habit on caterpillars of the velvetbean caterpillar, Anticarsia gemmatalis Hübner (Lepidoptera: Noctuidae) by Athrostictus sp. 1 and Athrostictus sulcatulus (Dejean) in Jaboticabal, São Paulo State, Brazil (Cividanes et al. 2014CIVIDANES FJ, IDE S, RIBEIRO AA & CIVIDANES TM DOS S. 2014. Predatory potential of Carabidae and Staphylinidae (Coleoptera) on the velvetbean caterpillar. Pesq Agropec Bras 49(8): 652-655.). In addition, N. speciosus reported as A. speciosus (Dejean) is recorded as a predator in agricultural crops of corn Zea mays L., lettuce Lactuca sativa L. (Poales: Poaceae), eggplant Solanum melongena L., gilo Solanum aethiopicum L., tomato Solanum lycopersicum L. (Solanales: Solanaceae), soybean Glycine max (L.) Merr. (Fabales: Fabaceae), etc. and forest of pine Pinus sp. (Pinales: Pinaceae) besides a range of weed species in Guaíra and Jaboticabal, São Paulo State (Cividanes & Cividanes 2008CIVIDANES FJ & CIVIDANES TMS. 2008. Faunistic analysis and populational fluctuation of Carabidae and Staphylinidae (Coleoptera) in Jaboticabal, state of São Paulo, Brazil. Arq Inst Biol 75(4): 449-456., Cividanes et al. 2003CIVIDANES FJ, SOUZA V DE P & SAKEMI LK. 2003. Faunal composition of predator insects in forest fragment and area of vegetables in Jaboticabal region, state of São Paulo, Brazil. Acta Sci Biol Sci 25(2): 315-321., 2017CIVIDANES FJ, CIVIDANES TM DOS S & FERRAUDO AS. 2017. Carabid beetle (Coleoptera: Carabidae) abundance and habitat preference in Northeastern São Paulo State, Brazil. Coleopt Bull 71(4): 769-777., 2018aCIVIDANES FJ, CIVIDANES TM DOS S & RIBEIRO AA. 2018b. Occurrence of carabid beetles in the phenological stages of weedy plants. Adv Entomol 6(2): 176-188.) and forest fragments and orange orchards, Citrus × sinensis (L.) Osbeck (Rutales: Rutaceae) in Gavião Peixoto, São Paulo State (Cividanes et al. 2010CIVIDANES FJ, ARAÚJO ES, IDE S & GALLI JC. 2010. Distribution and habitat preference of Carabidae and Staphylinidae (Coleoptera) in an orange orchard and a forest fragment. Fla Entomol 93(3): 339-345.).

The objectives of this study were to report a sudden and simultaneous population outbreak of N. speciosus and to describe the factors that could have contributed to this invasion in an urban area of 12 neighboring municipalities in the northern region of Minas Gerais State, Brazil in the Caatinga biome. In addition, female and male genitals were described and illustrated, its scientific classification revised and common names of N. speciosus presented.

MATERIALS AND METHODS

A population outbreak of N. speciosus suddenly began on 30 October 2018 with thousands of adults of this insect in the urban area of Januária municipality (Figure 1 and Table I). This outbreak lasted about 15 days and the number of beetles gradually decreased after the first week. Rainfall and average air temperature in Januária in October and November 2018 during the occurrence of N. speciosus were 32.0 and 136.1 mm and 28.3 and 25.3 °C, respectively (INMET 2018INMET. 2018. Instituto Nacional de Meteorologia. Available from: <http://www.inmet.gov.br/portal/index.php?r=home/page&page=rede_estacoes_conv_graf>. Accessed: Jul. 06, 2019.
http://www.inmet.gov.br/portal/index.php...
).

Table I
South latitude, West longitude, altitude, and area (Km2)* of 12 municipalities of the northern region of Minas Gerais State, Brazil with recorded occurrence of Neoaulacoryssus speciosus (Coleoptera: Carabidae).

In addition to Januária, the population outbreak of N. speciosus extended to the urban area of 11 neighboring municipalities in the northern region of Minas Gerais State, Brazil (Figure 1 and Table I). The occurrence of N. speciosus in these municipalities was confirmed by telephone calls, reading reports on internet blogs and direct observation in visits to some of them by the authors and partners of this work.

The locations of N. speciosus population outbreaks in the 12 listed municipalities were georeferenced and their coordinates used to prepare an occurrence map (Figure 1) for this insect in a laboratory of the Departamento de Ciências do Meio Ambiente at the Universidade Federal Rural do Rio de Janeiro in Três Rios, Rio de Janeiro State, Brazil using the ArcGIS Geographic Information System program, version 10.2.1 (Environmental Systems Research Institute®; Redlands, California, United States of America), with use licensed by SJM da C de M.

Photographs of N. speciosus in an urban area of the municipality of Januária were obtained (Figures 2a-2d) with a digital camera having a 35 mm lens, ISO-40, attached to a Smartphone (Samsung Electronics Co., Ltd.®; Seoul, South Korea).

Figure 1
Municipalities of the northern region of Minas Gerais State, Brazil with recorded occurrence of Neoaulacoryssus speciosus (Coleoptera: Carabidae).
Figure 2
Neoaulacoryssus speciosus (Coleoptera: Carabidae) in an urban area of the municipality of Januária, northern region of Minas Gerais State, Brazil (a and b); an adult of N. speciosus (c); N. speciosus at the base of a streetlight pole located in an urban garden (arrow) (d).

About 40 N. speciosus adults, without sex identification, were collected per municipality and placed in 250 mL plastic pots with the perforated lid. These insects were brought to the Laboratório de Entomologia of the Instituto Federal do Norte de Minas Gerais in Januária, sexed and mounted using an entomological pin. A part of the beetles was sent to Dr. Germano Henrique Rosado Neto, from the Departamento de Zoologia of the Universidade Federal do Paraná (UFPR) in Curitiba, Paraná State, Brazil, to identify the species by its external and internal morphological characteristics with dichotomous key of the genus Neoaulacoryssus provided by Noonan (1985)NOONAN GR. 1985. Classification and names of the Selenophori group (Coleoptera: Carabidae: Harpalini) and of nine genera and subgenera placed in incertae sedis within Harpalina. Milwaukee Public Museum. Contrib Biol Geol 64(1): 1-92. and Shpeley et al. (2017)SHPELEY D, HUNTING WM & BALL GE. 2017. A taxonomic review of the Selenophori group (Coleoptera, Carabidae, Harpalini) in the West Indies, with descriptions of new species and notes about classification and biogeography. ZooKeys 690(1): 1-195.. The specimens sent to the UFPR were deposited at the Museu de Entomologia of this institution under registration number 0152B/2018-RN. Another part of the beetles was preserved in 70% ethanol and sent to the Laboratório de Biologia Celular of the Universidade Federal dos Vales do Jequitinhonha e Mucuri in Diamantina, Minas Gerais State, Brazil where the female and male genitals were extracted, photographed and described.

Neoaulacoryssus speciosus females and males were sexed by extraction of the female ovipositor and male aedeagus with surgical forceps (Figures 3a-3d). Genitals were described after analysed, based on those of the internal morphology of insects of the Carabidae family provided by Noonan (1985)NOONAN GR. 1985. Classification and names of the Selenophori group (Coleoptera: Carabidae: Harpalini) and of nine genera and subgenera placed in incertae sedis within Harpalina. Milwaukee Public Museum. Contrib Biol Geol 64(1): 1-92. and Shpeley et al. (2017)SHPELEY D, HUNTING WM & BALL GE. 2017. A taxonomic review of the Selenophori group (Coleoptera, Carabidae, Harpalini) in the West Indies, with descriptions of new species and notes about classification and biogeography. ZooKeys 690(1): 1-195..

Figure 3
Female ovipositor and male aedeagus of Neoaulacoryssus speciosus (Coleoptera: Carabidae): dorsal (a) and lateral (b) aspects of male aedeagus; female ovipositor sclerite (c and d), gc 1= gonocoxite 1, gc 2= gonocoxite 2 and tl= lateral tergite. Arrows show the seta. Bar= 0.5 mm.

The scientific classification of N. speciosus has been updated (Table II) and scientific papers with the name “Neoaulacoryssus speciosus” and its synonyms “Athrostictus speciosus” and “Selenophorus speciosus”, published until the date of submission of this manuscript, read to listing of names of this species.

Table II
Scientific classification of Neoaulacoryssus speciosus.

Neoaulacoryssus speciosus (Dejean 1829DEJEAN PFMA. 1829. Species général des Coléoptères de M. le Comte Dejean. Tome IV, Paris, 520 p.)

Description. Diagnosis. Elytral macrosculpture is composed of elongate punctures in merging and chain-like places, with very short pubescence, with its length almost half or less the width of the elongated punctures. Elytra are reddish, pronotum is greenish and head is greenish-bluish-violaceous. Female reproductive tract and genitalia. Gonocoxite 2 is moderately thick, nearly straight. Bursa copulatrix is moderately large; spermatheca is long curved inflated initiating near base of common oviduct; spermatheca is terminated with two sausage-like extensions; spermatecal gland duct initiates near base of spermateca. Spermatecal gland duct is moderately long, gland triramous, with bulb-like swelling of duct basad gland. Setae in the female genitalia probably have sensory function. Male aedeagus. Top portion of phallic median lobe is long, narrowly tapered, symmetrically rounded in dorsal/ventral feature, with two small ventral hooks; endophalus with three fields of short fine spines, a longer and wider field in dorsal feature, a shorter and narrow field in left lateral feature, and a small field near the ostium; without lamina. Ventral surface of shaft with two rows of basad directed sharp saw-toothed ridges.

Outbreak. The insect causing the outbreak was identified as N. speciosus and the description and illustration of the female and male genitals are important for the identification of this species. Selenophorus (p. 80) and speciosus (p. 117) were described by Dejean in 1829 as the original binomen Selenophorus speciosus Dejean. In 1932, Csiki listed speciosus as a species in the genus Athrostictus (p. 1195). In 1985, Noonan described a new genus Neoaulacoryssus, and designated Selenophorus speciosus as the type species (Table II). Four common names were found for N. speciosus. They are carabid, carabe, ground beetle (Bousquet 2012BOUSQUET Y. 2012. Catalogue of Geadephaga (Coleoptera, Adephaga) of America, north of Mexico (in three parts). ZooKeys 245(1): 1-1722.), and vegetable beetle.

The sudden and simultaneous population outbreak of N. speciosus was recorded in 12 neighboring municipalities, with altitude between 434 and 1,130 m, at the beginning of the rainy season in the northern region of Minas Gerais State in the Caatinga biome of Brazil. Thousands of adults of both sexes of N. speciosus were observed in the analyzed municipalities, but the presence of this insect may also have occurred in other municipalities. Insects in the daytime were observed agglomerated in shady and moist places on the ground, including the base of streetlight poles, manhole and sidewalk edges, gardens, and rooftop gutters (Figures 2a-2d). At night, the beetles were observed in any artificially lit places including trade store lamps, streetlights, houses, and streets.

During the daytime, thousands of N. speciosus individuals were observed on myrtle trees, Myrtus sp. (Myrtales: Myrtaceae), a common plant in the urban gardens in Januária, but without damaging them (Figures 2a-2b). Neoaulacoryssus speciosus mating was observed during the night, but no egg was found at the sites of this insect occurrence in Januária.

Some people reported minor accidents from direct contact with N. speciosus adults during the outbreak of this insect, such as skin irritation. However, no official record of an accident with this insect was obtained from health facilities in the municipalities listed.

The genus Neoaulacoryssus Noonan includes only the species Neoaulacoryssus cupripennis (Gory) and N. speciosus (Noonan 1985NOONAN GR. 1985. Classification and names of the Selenophori group (Coleoptera: Carabidae: Harpalini) and of nine genera and subgenera placed in incertae sedis within Harpalina. Milwaukee Public Museum. Contrib Biol Geol 64(1): 1-92.). Neoaulacoryssus cupripennis has been reported to the West Indies, specifically in the eastern South America region known from Cayenne on the mainland, the islands of the Dutch Antilles and the islands of Saint Lucia, Mustique and Grenada in the Lesser Antilles (Shpeley et al. 2017SHPELEY D, HUNTING WM & BALL GE. 2017. A taxonomic review of the Selenophori group (Coleoptera, Carabidae, Harpalini) in the West Indies, with descriptions of new species and notes about classification and biogeography. ZooKeys 690(1): 1-195.). Neoaulacoryssus speciosus has been reported for South America (Shpeley et al. 2017SHPELEY D, HUNTING WM & BALL GE. 2017. A taxonomic review of the Selenophori group (Coleoptera, Carabidae, Harpalini) in the West Indies, with descriptions of new species and notes about classification and biogeography. ZooKeys 690(1): 1-195.).

Neoaulacoryssus cupripennis differs from N. speciosus by having the entire dorsum metallic cuprous (Shpeley et al. 2017SHPELEY D, HUNTING WM & BALL GE. 2017. A taxonomic review of the Selenophori group (Coleoptera, Carabidae, Harpalini) in the West Indies, with descriptions of new species and notes about classification and biogeography. ZooKeys 690(1): 1-195.). Neoaulacoryssus cupripennis and N. speciosus may be conspecific, due to the nearly identical form of the phallic medial lobe of the endophallus of these species (Noonan 1985NOONAN GR. 1985. Classification and names of the Selenophori group (Coleoptera: Carabidae: Harpalini) and of nine genera and subgenera placed in incertae sedis within Harpalina. Milwaukee Public Museum. Contrib Biol Geol 64(1): 1-92.). The three spine fields of these insects are similar in placement on the surface of the everted endophallus and length of spines, but differed in size and shape of the field (Shpeley et al. 2017SHPELEY D, HUNTING WM & BALL GE. 2017. A taxonomic review of the Selenophori group (Coleoptera, Carabidae, Harpalini) in the West Indies, with descriptions of new species and notes about classification and biogeography. ZooKeys 690(1): 1-195.).

The lack of information on N. speciosus morphology increases the importance of characterizing the female and especially the male genitalia of this insect for taxonomic and evolutionary studies (Shpeley et al. 2017SHPELEY D, HUNTING WM & BALL GE. 2017. A taxonomic review of the Selenophori group (Coleoptera, Carabidae, Harpalini) in the West Indies, with descriptions of new species and notes about classification and biogeography. ZooKeys 690(1): 1-195.). Photographs of N. speciosus can be used in medical situations to identify the species during diagnosis of allergies or irritations caused by insect contact. The valid name for the species studied is Neoaulacoryssus speciosus (Dejean), as confirmed by Shpeley et al. (2017)SHPELEY D, HUNTING WM & BALL GE. 2017. A taxonomic review of the Selenophori group (Coleoptera, Carabidae, Harpalini) in the West Indies, with descriptions of new species and notes about classification and biogeography. ZooKeys 690(1): 1-195.. The common names of N. speciosus are also used for other species in this group and no common name is specific for N. speciosus.

Potential associating factors to invasion

Neoaulacoryssus speciosus outbreaks have been reported at least since 1996 in Januária, with a significant beetle population, mainly in 1996 and 2009 as reported by local people. The outbreaks described occurred from October to February, months of the rainy season, and with increasing numbers of individuals since at least 2014. The outbreak reported in this work was the most significant (personal information, CWG de M). Outbreaks of a field cricket species, near Gryllus L., 1758 (Orthoptera: Gryllidae) were reported from early March to late April 2018 and 2019 after N. speciosus, with the largest population of this field cricket in 2018 in Januária (personal information, CWG de M). The begining of the rainy season in the northern region of Minas Gerais State coincided with the N. speciosus population outbreak, characterized by high air temperatures and air relative humidities (Silva et al. 2017SILVA MR, DE MOURA FP & JARDIM CH. 2017. The box diagram (Box Plot) applied to the analysis of the temporal distribution of rainfall in Januária, Belo Horizonte and Sete Lagoas, Minas Gerais, Brazil. Revista Brasileira de Geografia Física 10(1): 23-40.). Deforestation and expansion of monoculture crops (de Araújo et al. 2019DE ARAÚJO EJG, MORAIS VA, DAVID HC, SCOLFORO JRS, DE MELLO JM & EBLING AA. 2019. Spatialization of tree species diversity in the State of Minas Gerais. Floresta Ambien 26(1): e20150206.) may have contributed to the population outbreaks of N. speciosus in the northern region of Minas Gerais State. On the other hand, weed emergence at the beginning of the rainy season attracted carabids as shelter and food in Wageningen, Netherlands (Saska et al. 2007SASKA P, VODDE M, HEIJERMAN T, WESTERMAN P & VAN DER WERF W. 2007. The significance of a grassy field boundary for the spatial distribution of carabids within two cereal fields. Agr Ecosyst Environ 122(4): 427-434.).

Myrtus L. trees, used as shelter by N. speciosus in Januária, are of a botanical genus native to southwestern Europe and northern Africa (Siracusa et al. 2019SIRACUSA L, NAPOLI E, TUTTOLOMONDO T, LICATA M, LA BELLA S, GENNARO MC, LETO C, SARNO M, SPERLINGA E & RUBERTO G. 2019. A two-year bio-agronomic and chemotaxonomic evaluation of wild Sicilian myrtle (Myrtus communis L.) berries and leaves. Chem Biodivers 16(3): e1800575.), but any plant species in the urban area of Januária could have been used as a shelter by this insect. Neoaulacoryssus speciosus, reported as A. speciosus (Drury), damages post-sown seeds of P. glaucum and young plants of vegetables and other crops (da Costa Lima 1952DA COSTA LIMA A. 1952. Insetos do Brasil. 7° Tomo - Coleópteros, 2ª Parte. Escola Nacional de Agronomia, Série didática 9: 263-264.). However, predatory behavior by N. speciosus reported as A. speciosus (Dejean) has been recorded on orchards of C. × sinensis and forest fragments (Cividanes et al. 2010CIVIDANES FJ, ARAÚJO ES, IDE S & GALLI JC. 2010. Distribution and habitat preference of Carabidae and Staphylinidae (Coleoptera) in an orange orchard and a forest fragment. Fla Entomol 93(3): 339-345.) and agricultural crops of G. max, L. sativa, S. aethiopicum, S. lycopersicum, S. melongena, Z. mays, etc. and forest of Pinus sp. besides a range of weeds in Gavião Peixoto, Guaíra and Jaboticabal, São Paulo State, Brazil (Cividanes & Cividanes 2008CIVIDANES FJ & CIVIDANES TMS. 2008. Faunistic analysis and populational fluctuation of Carabidae and Staphylinidae (Coleoptera) in Jaboticabal, state of São Paulo, Brazil. Arq Inst Biol 75(4): 449-456., Cividanes et al. 2016CIVIDANES FJ, CIVIDANES TM DOS S & BARBOSA JC. 2016. Seasonal activity of Carabidae (Coleoptera) in forest fragments and crops in São Paulo, Brazil. Coleopt Bull 70(3): 638-644., 2018a, 2018b). The predation of A. gemmatalis caterpillars by Athrostictus sp. 1 and A. sulcatulus adults was studied for the biological control of this pest, with percentage of adult carabids that caused prey mortality and dry mass consumed of the prey (mean ± SE) of 50.0 (N= 20) and 8.0% (N= 12) and 0.0048 ± 0.0003 and 0.0027 ± 0.0001 mg, respectively (Cividanes et al. 2014CIVIDANES FJ, IDE S, RIBEIRO AA & CIVIDANES TM DOS S. 2014. Predatory potential of Carabidae and Staphylinidae (Coleoptera) on the velvetbean caterpillar. Pesq Agropec Bras 49(8): 652-655.). Neoaulacoryssus speciosus, reported as A. speciosus (Dejean), prefers to forage in dark places and with moist soil during the daytime like those with litter accumulation (Cividanes et al. 2003CIVIDANES FJ, SOUZA V DE P & SAKEMI LK. 2003. Faunal composition of predator insects in forest fragment and area of vegetables in Jaboticabal region, state of São Paulo, Brazil. Acta Sci Biol Sci 25(2): 315-321., 2010).

Other ecological importance

Neoaulacoryssus speciosus direct contact with the human skin can cause dermatitis due to the repellency defense mechanism of this insect, but they are rare because the insect has reduced flight capacity. The secretion of chemicals, such as formic acid with irritating effect on invertebrates and vertebrates, by carabid adults is common as a defense against predators (Bonacci 2013BONACCI T. 2013. Chlaenius velutinus (Coleoptera: Carabidae): The conspicuous ‘polecat’ among European carabid beetles. J Insect Behav 26(2): 223-227.). This compound has also been reported for ants of the subfamily Formicinae (Hymenoptera: Formicidae) (Rossini et al. 1997ROSSINI C, ATTYGALLE AB, GONZÁLEZ A, SMEDLEY SR, EISNER M, MEINWALD J & EISNER T. 1997. Defensive production of formic acid (80%) by a carabid beetle (Galerita lecontei). Proc Natl Acad Sci USA 94(13): 6792-6797.). However, studies of the defense mechanism and repellency of N. speciosus are scarce.

CONCLUSIONS

Neoaulacoryssus speciosus has been identified as the insect causing sudden and simultaneous outbreaks in an urban area of 12 municipalities in the northern region of Minas Gerais State in the Caatinga biome of Brazil, its female and male genitals illustrated, its scientific classification revised and four common names listed for this species. Deforestation and expansion of monoculture crops may have contributed to the population outbreaks of N. speciosus in the northern region of Minas Gerais State. The begining of the rainy season in the northern region of Minas Gerais State coincided with the N. speciosus population outbreak, characterized by high air temperatures and air relative humidities.

ACKNOWLEDGMENTS

To Dr. Danny Shpeley (University of Alberta, Edmonton, Canada) for information on the scientific classification, geographical distribution, and morphological description of Neoaulacoryssus speciosus. To Prof. Ana Paula Araújo Silva for the information on N. speciosus infestation in the municipalities of Janaúba, Nova Porteirinha, Porteirinha, and Riacho dos Machados. To the Conselho Nacional de Desenvolvimento Científico e Tecnológico (CNPq), Coordenação de Aperfeiçoamento de Pessoal de Nível Superior (CAPES) - Finance Code 001, Fundação de Amparo à Pesquisa do Estado de Minas Gerais (FAPEMIG), and Programa Cooperativo sobre Proteção Florestal (PROTEF) of the Instituto de Pesquisas e Estudos Florestais (IPEF) for their financial support.

REFERENCES

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Publication Dates

  • Publication in this collection
    13 Mar 2023
  • Date of issue
    2023

History

  • Received
    14 Oct 2019
  • Accepted
    26 Jan 2020
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