Oxyepoecus rosai

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Oxyepoecus rosai
Scientific classification
Kingdom: Animalia
Phylum: Arthropoda
Class: Insecta
Order: Hymenoptera
Family: Formicidae
Subfamily: Myrmicinae
Tribe: Solenopsidini
Genus: Oxyepoecus
Species: O. rosai
Binomial name
Oxyepoecus rosai
Albuquerque & Brandão, 2009

Oxyepoecus rosai casent0178852 p 1 high.jpg

Oxyepoecus rosai casent0178852 d 1 high.jpg

Specimen Labels

Specimens were attracted to sardine baits or recovered from the leaf-litter using Winkler extractors.

Identification

Albuquerque & Brandão (2009) - In the Rastratus species-group, O. rosai workers present the integument of mesopleuron and lateral pronotum irregularly sculptured, as in Oxyepoecus myops, but differs from the later by the larger compound eyes, and by the smooth integument on the head vertex and lateral portions of the pronotum, petiolar node, and postpetiole.

Keys including this Species

Distribution

The distribution of O. rosai includes only localities at South and Southeastern Brazil, between São Paulo and Santa Catarina States.

Distribution based on Regional Taxon Lists

Neotropical Region: Brazil (type locality).

Distribution based on AntMaps

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Distribution based on AntWeb specimens

Check data from AntWeb

Biology

Castes

Males are unknown.

Nomenclature

The following information is derived from Barry Bolton's New General Catalogue, a catalogue of the world's ants.

  • rosai. Oxyepoecus rosai Albuquerque & Brandão, 2009: 304, figs. 5a-c, 8 (w.q.) BRAZIL.

Unless otherwise noted the text for the remainder of this section is reported from the publication that includes the original description.

Description

Worker

(Holotype and paratypes (N = 33) variation within brackets): t.l. = 2.33 (2.30‑2,40); h.l. = 0.60 (0.60‑0.63); h.w. = 0.45 (0.43‑0.48); s.l. = 0.35 (0.35‑0.38); m.l.e. = 0.10 (0.10‑0.13); m.w.pr. = 0.33 (0.30‑0.35); a.l. = 0.65 (0.65‑0.68); h.f.l. = 0.35 (0.35‑0.38); m.w.p. = 0.20 (0.20‑0.23); m.w.pp. = 0.25 (0.25‑0.28); c.i. 75 (72‑76). Color chestnut brown, gaster fuscous. Irregularly costulae and rugulate sculpture covering almost all head dorsum integument, except by clypeus, around antennal insertions and vertex; almost all mesosoma irregularly reticulate, except antero-lateral portion of pronotum, area around propodeal spiracle, petiolar peduncle dorsum, node of petiole and postpetiole smooth and shining. Hairs moderately abundant, short and subdecumbent, on head dorsum mesad oriented, anteriorly curved on head sides; dorsum of mesosoma with suberect hairs, backwards oriented on petiolar and postpetiole nodes; gaster without interspersed shorter and decumbent hairs.

Head (f.f.v.): Mandible with basal border slightly shorter than chewing border, basal tooth separated from subbasal tooth by shallow diastema. Anterior tooth of clypeus mesially directed with smaller lateral denticle. Frontal carinae gently convex and subparallel over antennal sockets, maximum width between outer edges always less than one fourth head width. Compound eye with 4‑5 facets r.g.d., height less than oculomalar; total number of ommatidia not exceeding 13. Antennal scape fails to reach vertexal corner by distance approximately equal to maximum scape width. Funnicular segment I longer than II‑V combined, segments II‑VII distinctly broader than long, VIII and IX as long as broad. Vertexal margin straight.

Mesosoma with promesonotum gently rounded on shoulders. Metanotal groove almost indistinct (p.v.). Basal face of propodeum immarginate on sides, posteriorly with a small tooth. Declivous face laterally weakly carinate.

Petiole pedunculate, node scarcely compressed antero-posteriorly (d.v.) club shaped; subpetiolar process with a small, blunt and obliquely oriented denticle anteriorly. Postpetiole very broad, not as high as petiolar node; subpostpetiolar process shaped as small, transversal crest.

Queen

(variation of gynes paratypes, N = 2): t.l. = (2.80‑2.93); h.l. = (0.60‑0.63); h.w. = (0.50‑0.53); s.l. = (0.40‑0.43); m.l.e. = (0.25‑0.30); m.w.pr. = (0.43‑0.45); a.l. = (0.70‑0.73); h.f.l. = (0.38‑0.40); m.w.p. = (0.18‑0.20); m.w.pp. = (0.33‑0.35); c.i. (83‑85). Almost same workers character states, with caste differences of: three ocelli very small, with same diameter, approximately half minimum thickness of antennal scape, compound eye with 8 facets r.g.d., and circa 40 in whole eye.

Type Material

Holotype: worker. Brazil: São Paulo: Salesópolis [23°39’S, 45°53’W], 20‑26.x.1997, C. Klingenberg & C.I. Yamamoto col., attracted to sardine baits; deposited in Museu de Zoologia da Universidade de Sao Paulo. Paratypes (all from Brazil): São Paulo: forty one workers and two gynes from Salesópolis (Same locality of the Holotype, but collected in different dates and by different collectors); 33 workers and 2 gynes deposited in MZSP, one worker deposited in American Museum of Natural History, one worker deposited in California Academy of Sciences, one worker deposited in Instituto de Biologia Universidade Federal Rural do Rio de Janeiro, one worker deposited in Laboratório de Mirmecologia CEPEC / CPDC, one worker deposited in Museo de Historia Natural, Bogata, one worker deposited in Los Angeles County Museum of Natural History, one worker deposited in Instituto de Zoologia Agricola, one worker deposited in National Museum of Natural History.

Etymology

We are pleased to dedicate this species to our friend and colleague, Rogério Rosa da Silva, the most efficient collector in our team.

References

  • Albuquerque, N. L. d. and C. R. F. Brandão. 2009. A revision of the Neotropical Solenopsidini ant genus Oxyepoecus Santschi, 1926 (Hymenoptera: Formicidae: Myrmicinae): 2. Final. Key for species and revision of the Rastratus species-group. Papéis Avulsos de Zoologia (São Paulo). 49:289-309.