Oxyepoecus myops

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

Oxyepoecus myops casent0178853 p 1 high.jpg

Oxyepoecus myops casent0178853 d 1 high.jpg

Specimen Labels

Workers of this species have been recently extracted from litter samples taken in localities at sea level and up to more than 1000 m high in the Serra do Mar Range. Most localities are covered by dense evergreen tropical forests, but in some cases, samples come from drier forests as well, as in Seara, SC and Teresópolis, RJ. In Serra da Cantareira, SP, workers were attracted to sardine baits set on the forest floor during the day.

Identification

Albuquerque & Brandão (2009) - The exclusive character of Oxyepoecus myops workers in relation to the other species of the Rastratus group is the irregularly reticulate sculpture fully covering the head dorsum and almost all the mesosoma dorsum. Their compound eyes are the smallest in the genus.

Keys including this Species

Distribution

The distribution of O. myops includes several Southern Brazil localities, and in Minas Gerais, São Paulo and Rio de Janeiro 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.

  • myops. Oxyepoecus myops Albuquerque & Brandão, 2009: 295, figs. 1a-c, 6 (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 = 30), variation within brackets): t.l. = 2.08 (1.95‑2,15); h.l. = 0.53 (0.50‑0.53); h.w. = 0.40 (0.38‑0.43); s.l. = 0.30 (0.28‑0.31); m.l.e. = 0.06 (0.05‑0.08); m.w.pr. = 0.25 (0.23‑0.28); a.l. = 0.60 (0.58‑0.60); h.f.l. = 0.33 (0.28‑0.33); m.w.p. = 0.15 (0.13‑0.18); m.w.pp. = 0.20 (0.18‑0.20); c.i. 75 (76‑81). Color chestnut brown, legs and antennae slightly lighter. Integument with irregularly reticulate sculpture covering almost all head dorsum, except close to clypeus, and around antennal insertions; almost all mesosoma, petiole dorsum and postpetiole with irregulary reticulate sculpture; gaster smooth and shining. Hairs relatively abundant, short, subdecumbent and curved mesad on head dorsum, and anteriorly curved on the head sides; long and suberect on dorsum of mesosoma, petiole and postpetiole; hairs on gaster decumbent and shorter.

Mandible with basal border approximately equal chewing border, basal tooth separated from subbasal tooth by shallow diastema. Anterior tooth of clypeus with lateral, blunt denticle. Frontal carinae short, subparallel, with posterior end at level of anterior margin of compound eye, maximum width between their outer edges less than one fourth of head width. Compound eye very small, with 3‑4 facets r.g.d.; total number of ommatidia not exceeding 7. Antennal scape fails to reach vertexal margin by distance greater than maximum scape width. Funnicular segment I longer than either VIII or IX, as long as II‑V combined, segments II‑VII distinctly broader than long, VIII and IX as long as broad. Head with vertexal margin straight (f.f.v.).

Mesosoma with lateral and dorsal surfaces of pronotum not forming a well marked angle, slightly rounded. Metanotal groove weakly impressed (p.v.). Basal face of propodeum immarginate on sides, posteriorly with a small and obliquely directed tooth (p.v.). Declivous face laterally weakly carinate.

Petiole pedunculate, node scarcely compressed antero-posteriorly (d.v.); subpetiolar process with anterior end as a small and obliquely oriented denticle. Postpetiole strongly compressed antero-posteriorly, not as high as petiolar node; subpostpetiolar process shaped as small, transversal crest, parallel to ventrally produced posterior socket of postpetiole.

Queen

(variation of three paratype gynes): t.l. = (2.53‑2.58); h.l. = (0.55‑0.56); h.w. = (0.45‑0.48); s.l. = (0.33‑0.35); m.l.e. = (0.20‑0.25); 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. = (0.28‑0.30); c.i. (81‑86). Characters almost the same as workers, with the differences of the caste: the three ocelli with same diameter, approximately equal to minimum scape width, compound eye with 10 facets r.g.d., about 30 in all, scutellum not marginate.

Type Material

Holotype: worker. Brazil: São Paulo: Salesópolis [23°39’S, 45°53’W], 05‑07.vii.1997, C.I. Yamamoto col., extracted from the leaf litter using Winkler extractor; deposited in Museu de Zoologia da Universidade de Sao Paulo. Paratypes (all from Brazil): São Paulo: thirty workers and three gynes from Salesópolis (same locality of the Holotype, but collected in different dates and by different collectors), 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

The specific name refers to the relatively minute size of the compound eyes that characterize workers of this species.

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.