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versão impressa ISSN 1519-6984
Braz. J. Biol. vol.72 no.2 São Carlos maio 2012
Nova espécie do grupo Eiphosoma dentator (Fabricius, 1804) (Hymenoptera, Ichneumonidae, Cremastinae) para o Brasil
Melo, IF.*; Onody, HC.; Penteado-Dias, AM.
Departamento de Ecologia e Biologia Evolutiva, Universidade Federal de São Carlos - UFSCar, Rod. Washington Luís, Km 235, SP-310, CP 676, CEP 13565-905, São Carlos, SP, Brazil
A new species of Eiphosoma Cresson, 1865 (Hymenoptera, Ichneumonidae) is described based on five specimens collected in organic crops areas in Araraquara and Cravinhos municipalities, São Paulo State, Brazil. A diagnostic key to the neotropical Eiphosoma dentator species-group is also provided.
Keywords: neotropical region, taxonomy, parasitoid.
Descrição de uma nova espécie de Eiphosoma Cresson, 1865 (Hymenoptera, Ichneumonidae), baseada em cinco exemplares coletados em áreas de hortas orgânicas nos municípios de Araraquara e Cravinhos, no Estado de São Paulo, Brasil. Uma chave diagnóstica para as espécies neotropicais do grupo Eiphosoma dentator é também apresentada neste trabalho.
Palavras-chave: região neotropical, taxonomia, parasitoide.
Eiphosoma Cresson (1865) is a New World genus of Cremastinae (Ichneumonidae) comprising about 52 described neotropical species, 17 of which occur in Brazil (Costa Lima, 1953; Gauld, 2000; Yu et al., 2005; Fernández-Triana and Ravelo, 2007). The majority of Eiphosoma species occur in lowland habitats, and they are rarely encountered above 1500 m. The genus includes some of the commonest ichneumonid species to be seen and collected in open degraded habitats (Gauld, 2000).
Several species occur in agroecosystems and are important natural enemies of lepidopterous pests (Ashley et al., 1982; Gauld, 2000; Pozo, 2000; Fernández-Triana and Ravelo, 2007; Onody et al., 2009). Eiphosoma species are recorded as attacking a range of pyralid species like Diaphania hyalinata Linnaeus (Lepidoptera, Pyralidae) (Gauld, 2000), although the species most commonly found E. laphygmae, attacks noctuids (Townes and Townes, 1966). There are multiple hosts reported in previous papers, but all require confirmation because the identification of species of Eiphosoma it is often suspected due to the fact that many species have many similarities between them (Gauld, 2000).
Whilst the genus Eiphosoma is very distinguishable and well-known, the species are difficult to identify (Gauld, 2000) due to the small number of taxonomic works and the recurrent use of coloration patterns. There have been three taxonomic reviews in the last century that treated New World tropics Eiphosoma species: Cockerell (1913), Costa Lima (1953) and Gauld (2000) (Fernández-Triana and Ravelo, 2007).
Eiphosoma gauldi sp. nov. is a new neotropical Eiphosoma species that belongs to the E. dentator species-group. This group is characterised by the metapleuron densely punctate all over, straight ovipositor and uniformly hyaline fore wing. Only four neotropical species belonging to this group have been registered until now: E. dentator (Fabricius, 1804); E. mexicanum Cresson, 1874; E. yoron Gauld, 2000 and E. bioeco Fernández-Triana and Ravelo, 2007.
This paper describes Eiphosoma gauldi sp. nov. , captured during a study carried out in agro-ecosystems in São Paulo state. A key to Neotropical Eiphosoma dentator species-group is also presented.
2. Material and Methods
This study is based on the examination of five Eiphosoma specimens that have been collected in agroecosystems, in Araraquara (21° 44,5' S and 48° 13,04' W) and Cravinhos (21° 18' 54" S and 47° 47' 39" W) municipalities, in São Paulo state, using Malaise and Moericke traps. The specimens collected were deposited in the collection of the Departmento de Ecologia e Biologia Evolutiva da Universidade Federal de São Carlos, São Carlos, SP, Brazil (DCBU). The terminology follows Gauld (2000) and Fernández-Triana and Ravelo (2007).
Key to Neotropical Eiphosoma dentator species-group
1. Pleural carina absent posteriorly, only indicated by an impressed groove (Figure 8). Fore wing sparsely hirsute; distal abscissa of M and Cu1 spectral or absent (Figure 9); areolet absent or small and petiolate above, petiole usually longer than height of areolet......................................................E. dentator (Fabricius)
- Pleural carina complete (Figure 6). Fore wing not sparsely hirsute; distal abscissa of M and Cu1 more or less complete to margin; areolet always present if petiolate above, petiole shorter than height of areolet............................................................ 2
2. Upper mandibular teeth distinctly or slightly longer than lower ones. Propodeum with a short black stripe, at most only reaching the centre....................3
- Mandibular teeth more or less equal (Figure 4), sometimes lower slightly longer. Black strip on the propodeum not short, reaching at least the posterior carina ......................................................4
3. Malar space 0.2-0.3 times as long as basal mandibular width. Fore wing with shorter petiole compared to dorsal end of areolet. Upper end of epomia very weakly raised, forming a low rounded swelling laterally.............................E. yoron Gauld
- Malar space 0.3-0.4 times as long as basal mandibular width. Fore wing with longer petiole compared to dorsal end of areolet. Epomia raised, without low and rounded swollen flange...............................E. bioeco Fernández-Triana and Ravelo
4. Malar space about 0.3 times as long as basal mandibular width. Scutellum with one or two punctures. Hind wing with five distal hamuli.................. .............................................E. mexicanum Cresson
- Malar space about 0.6 times as long as basal mandibular width. Scutellum densely punctate centrally (Figure 5). Hind wing with four distal hamuli..........................................E. gauldi sp. nov.
Eiphosoma gauldi sp. nov. Melo, Onody and Penteado-Dias
- Holotype: 1♀ Palmares farm - coffee cultivars, 24/ III/ 2006, Moericke trap, R.I.R. Lara and team col., Cravinhos, SP, Brazil.
- Paratypes: 2♂ organic cultivars, 10/IV/2006, Malaise trap, H. C. Onody col., Araraquara, SP, Brazil; 2♀ organic cultivars, 23/ VI to 07/VII/2006, Malaise trap, H. C. Onody col., Araraquara, SP, Brazil.
- Etymology: The specific name "gauldi" is in memoriam and honor of Ian D. Gauld for his contributions to the Ichneumonidae knowledge.
- Diagnosis: E. gauldi runs to couplet 17 in Gauld (2000) key to Eiphosoma species. It is, however, different from E. mexicanum and E. yoron. The new species most closely resembles E. mexicanum by having the mandible more or less equally bidentate (in the others species the lower mandibular tooth is shorter than the upper ones) and the lower part of the occipital carina not meeting the hypostomal carina. However E. gauldi sp. nov. has a scutellum densely punctate all over, hind wing with only four distal hamuli and a longer malar space.
Female- Large sized species (Figure 1), fore wing length 6 mm (Figure 3). Mandible weakly tapered towards distal end, with teeth more or less equal (Figure 4); clypeus, in profile, convex, malar space about 0.6 times as long as basal mandibular width (Figure 4); posterior ocellus separated from eye by 1× its own diameter. Pronotum with dorsal end of epomia raised; mesoscutum strongly punctate (Figure 5); scutellum more or less flat with punctures (Figure 5), mesopleuron with regularly punctate except in the black diagonal stripe; epicnemial carina reaching anterior end of pleuron about half way up pronotum; sternaulus strongly impressed anteriorly; metapleuron regularly punctate over entire surface (Figure 6); submetapleural carina present and moderately elevated (Figure 6). Propodeum usually smooth in the central furrow, laterally sparsely punctate; anterior and posterior tranverse carina complete (Figure 7); area basalis smooth, laterally often confluent with area postero externae. Hind leg with trochantellus, in dorsal view, 0.7× as long as the trochanter; hind tibia and tarsus densely spinose; hind tarsal claw with long stout pectinae to the end. Fore wing with areolet large, obliquely quadrate, shortly petiolate above (Figure 3). Hind wing with 4 distal hamuli. Ovipositor straight 1.1-1.3× as long as hind tibia; ovipositor sheath with long and dense pubescence.
Head yellow with frons centrally, interocellar area, part of occiput and gena black; mesosoma yellow with three longitudinal black marks on the mesoscutum, distal end of scutellum, a diagonal stripe and the anterior margin of metapleuron, anterior margin and median long stripe on propodeum black. Metasoma yellowish brown with apical tergite I and tergite II black. Anterior two pairs of legs yellow; hind legs yellow with spots on inner and outer sides of coxa, trochanter, apical and basal bands of femur, broad basal and apical bands on tibia and entire tarsus black. Wings hyaline, pterostigma dark brown.
- Male (Figure 2): Similar to female, but propodeum is more punctate.
- Variation: The diagonal black stripe on mesopleuron sometimes is interrupted and the size of black marks near propodeal spiracles can be variable.
- Host: unknown.
Acknowledgements - The authors are grateful to FAPESP (Fundação de Amparo à Pesquisa do Estado de São Paulo) and to CAPES (Coordenação de Aperfeiçoamento de Pessoal de Nível Superior) for financial support. Thanks also to Marcelo Oyafuso for facilitating the fieldwork, Daniell Fernandes for collection of one specimen, and Luciana Bueno dos Reis Fernandes for the support with the pictures.
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Received April 14, 2011
Accepted June 07, 2011
Distributed May 31, 2012