Open-access First record of Eumops glaucinus (Wager, 1843) (Chiroptera, Molossidae) to the Brazilian state of Maranhão

Abstract

The study provides the first record of Eumops glaucinus in the Maranhão state, located in the northern region of Brazil. The collected specimen was a non-lactating adult female, with grayish pelage, broad ears, smooth face, a well-developed and squarish tragus, and elongated snout. The combined analysis of the morphological and molecular data (COI, Cyt b, and rRNA 16S genes) confirmed the occurrence of E. glaucinus in the state of Maranhão. This record extends the known species range area by 660 km easternward from the closest locality, Belém, Pará.

Keywords. Wagner’s bonneted bat; Morphology; Mitochondrial DNA; Maranhão.

INTRODUCTION

Eumops Miller (1906) is the most diversified bat genus of the family Molossidae, which currently includes 14 species, worldwide (Medina et al., 2012; Gregorin et al., 2016). These species considerably vary in body size (Eger, 2008) and several qualitative traits of external, cranio-dental and penial morphology (Gregorin, 2009). The 14 Eumops species recognized at present are E. auripendulus (Shaw, 1800), E. bonariensis (Peters, 1874), E. glaucinus (Wagner, 1843), E. hansae (Sanborn, 1932), E. perotis (Schinz, 1821), E. patagonicus (Thomas, 1924), E. maurus (Thomas, 1901), E. delticus (Thomas, 1923), E. trumbulli (Thomas, 1901), E. chimaera (Gregorin et al., 2016), E. dabbenei (Thomas, 1914), E. nanus (Miller, 1900), E. wilsoni (Baker et al., 2009), and E. floridanus (Allen, 1932).

The external morphology of E. glaucinus is defined by its short and shiny hair, a light chestnut to yellowish or occasionally grayish colored pelage. However, some individuals are darker and blackish. Its venter is lighter than the dorsum, the snout is elongated, the tragus is well developed and it has a squarish shape (Gregorin & Taddei, 2002). E. glaucinus is widely distributed in South America, between Venezuela and northern Argentina, occurring in all countries except French Guiana, Suriname, Chile and Uruguay (McDonough et al., 2008; Eger, 2008). In Brazil, these species has been recorded in 14 states - Acre, Alagoas, Amazonas, Bahia, Espirito Santo, Minas Gerais, Mato Grosso do Sul, Mato Grosso, Pará, Paraíba, Pernambuco, Paraná, Rio de Janeiro and São Paulo (Guerra, 2007; Mendes et al., 2009; Ramos et al., 2013).

The mitochondrial Cytochrome Oxidase subunit I gene (COI), a fragment of 650 nucleotides from the 5’ extremity, was proposed by Hebert et al. (2003a, 2003b) as a molecular marker for the identification of species, which has been widely adopted as a identification tool for vertebrates species. The Cytochrome b gene (Cyt b) has provided excellent results in phylogenetic analyses (Meyer & Wilson, 1990; Esposti et al., 1993; Gregorin et al., 2016), while the 16S rRNA gene has been widely used for the identification of animal species and their relatedness, given its species-specific characteristics (Coleman, 2003; Naegele et al., 2006).

The combined analysis of these molecular markers provides a reliable approach for the identification of species. In the present study, the analysis of morphological and molecular data has been used to identify a specimen of E. glaucinus collected in the eastern of the Maranhão state, which represents the first record for the state of Maranhão.

MATERIAL AND METHODS

The E. glaucinus specimen recorded here was collected in the municipality of Codó (04°27′41″S, 43°53′11″W) located in the eastern of the Maranhão state, this state is located in the northern region of Brazil (IBGE, 2019). The specimen was collected in a disused textile factory, located in the center of the city of Codó, in July 2018. This place is located in an area that has a high trees density, with several large houses, retail stores, and also street vendors. The specimen was collected with a mist net which dimensions are: 3 meters high for 12 meters length, with a 25 mm mesh, this was fixed to the ground by being tied to poles.

We took the specimen to the Genetics and Molecular Biology Laboratory (GENBIMOL) of the Center for Higher Studies at Maranhão State University (CESC/UEMA) based in the city of Caxias, Maranhão. The bat was weighed with a Pesola spring balance and its morphological length was measured using a caliper (300 mm). A series of external measurements were obtained (Table 2) using a caliper: The length of the right (RF) and the left forearm (LF), ear (E), tragus (TG), foot (F), and tail (TL). Ten craniometric measurements were also taken (Table 3): The greatest length of the skull (GLS), condylobasal length (CBL), height of the braincase (HBC), braincase breadth (BB), zygomatic arch (ZA), postorbital breadth (PB), width across upper canines (CC), height of the first molar (M1M1), length of the mandible (LMAN) and the palate length (PL). The specimen was treated with formalin at 10% of concentration and conserved in a 70% ethanol concentration fluid into a sealed glass jar. The specimen was identified taxonomically using the classification keys of Gardner (2008) and Reis et al. (2011, 2013, 2017). The collection of specimen was authorized by ICMBio through IBAMA/SISBIO license number: 42670-3.

Table 1
The GenBank accession numbers of the sequences included in the present analysis of the Cyt b and COI gene sequences.

Table 2
Morphological measurements of the E. glaucinus specimen collected in eastern Maranhão, Brazil.

Table 3
Comparison of the craniometric measurements of the E. glaucinus specimen collected in the present study with those of the holotype presented by Medina et al. (2014).

For the molecular analyses, the total DNA was extracted from muscle tissue using Promega’s Wizard Genomic DNA Purification kit. The mitochondrial COI, Cyt b, and rRNA 16S genes were amplified by Polymerase Chain Reaction (PCR). The COI gene was amplified using the primers LCO-1490 and HCO-2198 described by Folmer et al. (1994), while the Cyt b sequence was amplified with the primers L14121-H15318 described by Redondo et al. (2008), and the rRNA 16S gene was amplified using the primers 16SL-1987 and 16SH-2609 described by Palumbi et al. (1991).

The samples were sequenced using the dideoxy-terminal method (Sanger et al., 1977) in an ABI Prism™ 3500 automatic DNA sequencer using the Big Dye kit. The phylogenetic analysis was run in MEGA X (Kumar et al., 2018), using the Tamura Nei algorithm as the evolutionary model. To determine the degree of similarity among the different species, the COI sequence was plotted in the BOLD Systems (Barcode of Life Data) platform, v3 (Ratnasingham & Hebert, 2007), while the sequences of the Cyt b and rRNA 16S genes were plotted in the BLAST (Basic Local Alignment Search Tool) platform (Myers et al., 2014).

The Cyt b and COI sequences obtained in the present study were compared with those obtained from GenBank for E. glaucinus and other Eumops species (Table 1). The rRNA 16S gene was not included in this analysis because no GenBank sequences are available for E. glaucinus. The sequence presented here is thus the first E. glaucinus rRNA 16S sequence deposited in the GenBank.

RESULTS

In the present study was collected an individual of E. glaucinus (field number: CUMA 72, voucher: 12156), identified as a non-lactating adult female, with a short, shiny, and grayish coat, wide ears, smooth face, well-developed square tragus, and elongated snout (Fig. 1). The bat weighed 35 g and had a dental formula of 1/2, 1/1, 2/2, and 3/3 = 30 teeth.

Figure 1
The E. glaucinus specimen collected in the Brazilian state of Maranhão.

The species was identified based on the morphological measurements of the forearm (left and right), ear, tragus, foot, and tail (Table 2), and the set of craniometric parameters (Table 3). The skull is elongated with a rounded braincase, which is flattened dorsally, with a high and well-developed occipital protuberance. The rostrum is flat and is only slightly lower than the braincase. The presence position of the first upper premolar is a diagnostic characteristic of E. glaucinus (Fig. 2).

Figure 2
Skull of E. glaucinus: (A) dorsal view, showing the bifid upper incisors and diastema, (B) ventral view, showing the size of the canines relative to the incisors, (C) upper tooth row, showing the size and position of the first upper premolar, (D) lateral view, showing the elongation of the flattened, rounded braincase, and (E) lateral view showing the length of the mandible. Scale bar = 10 mm.

The E. glaucinus specimen recorded in current study confirms the occurrence of the species in the state of Maranhão and extends the known distribution of the species by 660 km from the nearest locality, at Belém (01°27′18″S, 48°30′09″W) in Pará, Brazil (Fig. 3).

Figure 3
Geographic distribution of E. glaucinus in Brazil. The star indicates the collecting locality of the present study, which is the first record of the occurrence of the species in the state of Maranhão. The dots indicate all previous localities in Brazil, as recorded by Manhães (2017).

The analysis of the COI, Cyt b and rRNA 16S molecular markers, confirmed the morphological diagnosis of the occurrence of E. glaucinus in the Brazilian state of Maranhão. The COI sequence had 617 base pairs (bps) and the specimen described here was 96.20% similar to E. floridanus, based on the analysis on the BOLD Systems platform. The Maximum Likelihood, Maximum Parsimony, and Neighbor-Joining phylogenetic trees all had a similar topology, in which the E. glaucinus specimen from Maranhão formed a clade (99% bootstrap value) with E. floridanus from the United States, which was, in turn, a well-supported sister group of E. perotis and E. auripendulus (Fig. 4). The mean interspecific nucleotide divergence of E. glaucinus from the other Eumops species varied from 4.3% concerning E. floridanus, to 18% in comparison with E. hansae (Table 4).

The Cyt b sequence had 598 bps, and the specimen collected in the present study was 98.44% similar to the E. glaucinus sequences on the BLAST platform. The Maximum Likelihood, Maximum Parsimony, and Neighbor-Joining trees all had a similar topology, in which the specimen from Maranhão formed a well-supported clade with the E. glaucinus sequences from Venezuela and Paraguay, with 99% bootstrap support, which is the sister group of the E. glaucinus specimens from Cuba and Mexico, with 99-100% bootstrap support (Fig. 5). The mean interspecific nucleotide divergence between E. glaucinus (including the specimen from Maranhão) and the other Eumops species ranged from 5.5% to 20.9%, while the intraspecific divergence between the specimen from Maranhão and E. glaucinus from Paraguay and Venezuela was 1.4%, increasing to 4.9% for the E. glaucinus sequences from Cuba and 5.2% for those from Mexico. The divergence from the American E. floridanus sequences (5.5%) was virtually the same as that for the Mexican E. glaucinus (Table 5).

Figure 4
Neighbor-Joining phylogenetic tree of Eumops species based on the analysis of the COI sequences, using the Tamura-Nei algorithm. The E. glaucinus specimen from Maranhão (CUMA72) is highlighted. The values at each node refer to the Neighbor-Joining/Maximum Parsimony/Maximum Likelihood bootstrap scores. Legend: USA = United States; CAN = Canada; FG = French Guiana; MA = Maranhão, Brazil.

Table 4
Matrix of the mean genetic distances between the Eumops species (and the outgroup) based on the COI sequences, with the Tamura Nei algorithm. Interspecific divergence is shown below the diagonal, and intraspecific distances are shown along the diagonal, in bold type.

Figure 5
Neighbor-Joining phylogenetic tree of Eumops species based on the analysis of the COI sequences, using the Tamura-Nei algorithm. The E. glaucinus specimen from Maranhão (CUMA72) is highlighted. The values at each node refer to the Neighbor-Joining/Maximum Parsimony/Maximum Likelihood bootstrap scores. Legenda VEN = Venezuela, CUB = Cuba, MEX = Mexico, ECU = Ecuador, FG = French Guiana; PAR = Paraguai, USA = United States, BOL = Bolivia, MA = Maranhão, Brazil.

Table 5
Matrix of the mean genetic distances between the Eumops species (and the outgroup) based on the Cyt b sequences, with the Tamura Nei algorithm. Interspecific divergence is shown below the diagonal, and intraspecific distances are shown along the diagonal, in bold type. Legend: n/c = not calculated; USA = United States; MA = Maranhão; VEN = Venezuela; MEX = Mexico; ECU = Ecuador; PAR = Paraguay; FG = French Guiana.

DISCUSSION

The genus Eumops is made up of fast-flying insectivorous bats, which forage in open environments or above the forest canopy (Sodré et al., 2008). These features of the behavior of Eumops are assumed to account for the infrequent capture of E. glaucinus specimens in Brazil. This species appears to inhabit mainly forests, but may roost in rock crevices, tree holes, and even buildings, where it forms small colonies. Eumops glaucinus hunts insects in flight, in particular species of the orders Coleoptera, Diptera, Orthoptera, and Hemiptera (Reis et al., 2007). The abundance of insects found in the vicinity of old buildings, such as the disused textile factory in Codó, is favorable to the presence of insectivorous bats, and was presumably a factor contributing to the capture of the E. glaucinus individual for the present study.

The external morphology of E. glaucinus is similar of the other species of the genus, although it can be differentiated from E. floridanus by its medium size, in comparison with the much larger E. floridanus (Timm & Genoways, 2004) and the far geographic distance. The cranial features of E. floridanus are also distinct from those of E. glaucinus, including the maximum cranial length, condylobasal length, and the width of the zygomatic arch, which are all relatively large, and also differentiate the species from the other members of the genus (Eger, 1977; Peracchi et al., 2011). In general, the craniometric and morphological data collected from the Maranhão specimen support its identification as E. glaciunus (Fig. 2 and Tables 2 and 3).

The Cyt b sequence of the specimen from Maranhão diverges only marginally (1.4%) from those of the E. glaucinus specimens from Paraguay and Venezuela, which is consistent with an intraspecific level of differentiation, considering the 2% threshold proposed by Bradley & Baker (2001). The Maranhão sequence nevertheless diverges considerably from the E. glaucinus sequences from Cuba (4.9%) and Mexico (5.2%), and in fact, these distances are similar to that recorded for E. floridanus from the United States (5.5%). In the case of the COI gene, the smallest distance recorded between the Maranhão sequence and the other Eumops sequences was recorded in the case of the American E. floridanus, with a distance of 4.3%. This level of divergence is typical of that found between populations (Bradley & Baker, 2001).

McDonough et al. (2008) concluded that E. glaucinus are complex species, and Gregorin (2009) was unable to elucidate the relationship between this complexity and the other Eumops species. Bartlett et al. (2013) has failed to elucidate the relationship of the E. glaucinus complexity to other species of the genus Eumops,Gregorin et al. (2016) recognized four species groups, including an E. glaucinus species group, which contained E. floridanus, E. glaucinus, E. wilsoni, E. ferox, E. dabbenei, and E. underwoodi. Despite these advances, some of the relationships within the genus remain unresolved, including those of the E. glaucinus complexity, and a more definitive arrangement will require more systematic and integrative analyses that include a broader selection of taxa. In this context, it will be especially important to integrate different approaches to the understanding the diversity of the genus, given the often-inconclusive findings of the genetic analyses.

CONCLUSIONS

The combined analysis of the morphological and molecular data confirmed the occurrence of E. glaucinus in the Brazilian state of Maranhão, it’s a location that extends its known distribution by 660 km east from the nearest locality, Belém, Pará. The study also provides the first sequence of the mitochondrial rRNA 16S gene of E. glaucinus deposited on the Genbank in addition to the sequences of the other genes (COI and Cyt b).

ACKNOWLEDGMENTS

We are grateful to the Maranhão State Research, the Scientific and Technological Development Foundation (FAPEMA), the Brazilian Coordination for Higher Education Personnel Training (CAPES) and the National Council for Scientific and Technological Development (CNPq).

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  • FUNDING INFORMATION:
    FHSC and SBM were supported by the coordination of improvement of higher-level personnel - Brazil (CAPES) - Financial Code 001. APMO was supported by the National Council for Scientific and Technological Development (CNPq).
  • Published with the financial support of the "Programa de Apoio às Publicações Cientícas Periódicas da USP"

Edited by

  • Edited by: Luís Fábio Silveira

Publication Dates

  • Publication in this collection
    09 Dec 2022
  • Date of issue
    2022

History

  • Received
    24 Mar 2022
  • Accepted
    07 Sept 2022
  • Published
    01 Nov 2022
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