A new species of Lyrocladius Mendes et Andersen from Brazil (Diptera: Chironomidae, Orthocladiinae)

Uma espécie nova de Lyrocladius Mendes et Andersen do Brasil (Diptera: Chironomidae, Orthocladiinae)

ARTICLES

A new species of Lyrocladius Mendes et Andersen from Brazil (Diptera: Chironomidae, Orthocladiinae)

Uma espécie nova de Lyrocladius Mendes et Andersen do Brasil (Diptera: Chironomidae, Orthocladiinae)

Humberto Fonseca Mendes^I,*; Trond Andersen^II

^ICentro de Ciências Naturais e Humanas, Universidade Federal do ABC -UFABC, Av. dos Estados, 5001, Bloco A, Torre 3, 6º andar, Bairro Bangu, CEP 09210-580, Santo André, SP, Brazil

^IIDepartment of Natural History, University Museum of Bergen, University of Bergen, P.O. Box 7800, N-5020 Bergen, Norway

ABSTRACT

The genus Lyrocladius Mendes et Andersen was described in 2008 based on L. radulatus Mendes et Andersen from Southern and Southeastern Brazil. Here a second species, Lyrocladius cacau sp.n., is described and figured based on a single male from Bahia in Northeastern Brazil.

Keywords:Chironomidae, Orthocladiinae, Lyrocladius cacau, new species, Brazil, Bahia, Neotropical region, Mata Atlântica.

RESUMO

O gênero Lyrocladius Mendes et Andersen foi descrito em 2008 com base na espécie L. radulatus Mendes et Andersen a partir de material das regiões sul e sudeste do Brasil. Aqui descrevemos e ilustramos uma espécie nova, Lyrocladius cacau, com base em um único macho adulto da Bahia, nordeste brasileiro.

Palavras-chave:Chironomidae, Orthocladiinae, Lyrocladius cacau, espécie nova, Brasil, Bahia, região Neotropical, Mata Atlântica.

Introduction

The genus Lyrocladius was described by Mendes & Andersen (2008) based on the male of L. radulatus Mendes et Andersen, 2008 from Paraná and Rio de Janeiro States in Southern and Southeastern Brazil. The genus can be separated from other orthoclad genera by having simple, slightly decumbent acrostichals starting close to antepronotum and scalpellate acrostichals in mid scutum combined with a lyre-shaped anal point, eyes without dorsomedian extension, wing membrane bare, squama with setae, costa extended, and megaseta sitting on tubercle.

Below we describe a second species of Lyrocladius, L. cacau sp.n. based on a male from Bahia in Northeastern Brazil. The new species shares with L. radulatus all the diagnostic characters proposed in the original description of the genus (Mendes & Andersen 2008), placing it well within Lyrocladius.

Material and Methods

The specimen was mounted on slides in Canada balsam following the procedures outlined by Sæther (1969). The terminology follows Sæther (1980).

The type will be deposited in the Museu de Zoologia da Universidade de São Paulo, São Paulo, Brazil (MZUSP).

Lyrocladius Mendes et Andersen

Lyrocladius Mendes et Andersen, 2008: 61.

Type species:

Lyrocladius radulatus Mendes et Andersen, 2008: 62, by original designation.

Other included species:

Lyrocladius cacau sp.n.

Description as in Mendes & Andersen (2008) with the following emendations: virga with or apparently without lateral lamellae; gonostylus with row of straight, moderately strong to curved, very strong setae.

Lyrocladius cacau new species (Figures 1-3)

 

Type material: Holotype male, Brazil: Bahia: Ilhéus (CEPLAC - Áreas de cultivo de cacau), 14º 46' 16.6"; S and 39º 13' 12.8"; W, 17.v.2002, 42 m a.s.l., light trap, M.V. Yamada (MZUSP).

Diagnostic characters: The species can be separated from L. radulatus by the higher VR (1.77 compared to 1.43 in L. radulatus), slightly longer C extension (95 µm compared to 81 µm in L. radulatus), and by the shape of the gonostylus with row of straight, moderately strong setae.

Etymology: From Portuguese 'cacau' meaning cocoa referring to the fact that the species was collected in a cocoa crop field. The name is to be regarded as a noun in apposition.

Description

Male (n = 1). Total length 1.62 mm. Wing length 958 µm. Total length / wing length 1.69. Wing length / length of profemur 2.42.

Coloration. Dark brown without lighter markings

Head. AR 0.77. Ultimate flagellomere 256 µm long. Temporal setae 9, including 4 inner verticals, 3 outer verticals, and 2 postorbitals. Clypeus with 8 setae. Tentorium 104 µm long, 14 µm wide. Stipes 77 µm long. Palp segment lengths (in µm): 18, 34, remaining segments not measurable. Third palpomere with 3 sensilla clavata subapically, longest 11 µm long.

Thorax. Antepronotum with 1 seta. Dorsocentrals 8; acrostichals 13 beginning close to antepronotum, composed of 8 anterior simple and 5 posterior scalpellate; prealars 3, 2 posterior and 1 anterior; supraalar 1. Scutellum with 4 setae.

Wing (Figure 1). VR 1.77. C extension 95 µm long. Brachiolum with 1 seta; R with 1 seta, remaining veins and cells bare. Squama with 1 seta.

Legs. Spur of fore tibia 41 µm long, mid leg lost, spurs of hind tibia 11 and 35 µm long. Width at apex of fore tibia 20 µm, of hind tibia 32 µm. Comb with 13 setae, longest 41 µm, shortest 19 µm long. Lengths and proportions of legs as in Table 1.

Hypopygium (Figures 2-3). Tergite IX covered with microtrichia; laterosternite IX with 4 setae. Anal point triangular, lyre-shaped, 32 µm long, 23 µm wide at base, with 21 marginal setae. Phallapodeme 57 µm long; transverse sternapodeme 68 µm long. Virga 50 µm long, apparently without lateral lamellae. Gonocoxite 129 µm long. Gonostylus 64 µm long, megaseta 7 µm long. HR 2.03; HV 2.55.

Distribution

The species is known from Bahia State in Northeastern Brazil, where it was collected in a light trap in a cocoa crop field.

Acknowledgements

We are indebted to Dr. Fabio O. Roque for making the new species available to us. The study was partially funded through the Brazilian Research Council of São Paulo State (FAPESP 11/50162-1) within the BIOTA/FAPESP - The Biodiversity Virtual Institute Program (www.biota.org.br), partly by the University Museum of Bergen, University of Bergen.

Received 08/12/2011

Revised 08/12/2011

Accepted 09/01/2012

References

• MENDES, H.F. & ANDERSEN, T. 2008. A review of Antillocladius Sæthe and Litocladius Mendes, Andersen et Sæther, with the description of two new Neotropical genera (Diptera, Chironomidae, Orthocladiinae). Zootaxa 1887:1-75.
• SÆTHER, O.A. 1969. Some Nearctic Podonominae, Diamesinae and Orthocladiinae (Diptera: Chironomidae). Bull. Fish. Res. Board Canada 107:1-154.
• SÆTHER, O.A. 1980. Glossary of Chironomid morphology terminology (Diptera: Chironomidae). Ent. Scand. 14(Suppl.):1-51.

Publication Dates

• Publication in this collection
  25 July 2012
• Date of issue
  Mar 2012

History

• Received
  08 Dec 2011
• Accepted
  09 Jan 2012
• Reviewed
  08 Dec 2011