Rogeria nevadensis

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Rogeria nevadensis
Scientific classification
Kingdom: Animalia
Phylum: Arthropoda
Class: Insecta
Order: Hymenoptera
Family: Formicidae
Subfamily: Myrmicinae
Tribe: Solenopsidini
Genus: Rogeria
Species: R. nevadensis
Binomial name
Rogeria nevadensis
Kugler, C., 1994

Rogeria nevadensis P casent0106209.jpg

Rogeria nevadensis D casent0106209.jpg

Specimen Label

Collections of Rogeria nevadensis have been made from montane wet forest.

Identification

Kugler (1994) - creightoni species group. WL 0.58-0.65mm. Clypeal apron emarginate. Eye small. Shoulders rounded; promesonotum and Propodeum meet without a strong angle. Postpetiolar node widest in anterior half. Sides of head largely smooth and shiny. Promesonotal dorsum longitudinally rugose, with low, rounded ridges and no lateral spurs; interrugal spaces wide and nearly smooth. No erect hair on scapes or extensor surfaces of legs.

Rogeria merenbergiana, which is also found at high elevations in Colombia and Ecuador, has similar shapes of clypeus, mesosoma and propodeal spines, and somewhat reduced sculpture, but: 1) are a little larger than Rogeria nevadensis (WL 0.69-0.83mm), 2) have a metanotal impression, 3) have erect hair on second and third tibiae and scapes, and 4) are more distinctly sculptured, with sides of head rugose.

Rogeria carinata from Puerto Rico and Tortola have the same size, pilosity, shape of waist, and extensive shiny spaces on mesosoma, but: 1) the metanotal-propodeal junction is more angular, 2) the sides of the head are distinctly rugose, 3) the promesonotal dorsum has straighter parallel ridges and smoother intervals, and 4) the propodeal spines are generally shorter (PSI 0.11-0.15).

Keys including this Species

Distribution

Colombia and Venezuela

Distribution based on Regional Taxon Lists

Neotropical Region: Colombia (type locality), Venezuela.

Distribution based on AntMaps

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Distribution based on AntWeb specimens

Check data from AntWeb

Biology

The following is modified from Kugler (1994): Little is known about these cryptic ants. Collection records typically range from sea level to 1000m, but five species extend higher and two (Rogeria unguispina and Rogeria merenbergiana) can be found at 2000m. Rogeria are generally collected in moist forests (primary or secondary forests, coffee or cacao plantations), but at higher elevations can be found in pastures (Rogeria leptonana, Rogeria merenbergiana). Several species (Rogeria creightoni, Rogeria cuneola, Rogeria foreli) have been found in moist and dry climates. Rogeria foreli is the most unusual, with some members dwelling at over 1800m in the temperate mountains of southern Arizona.

Most species have only been collected as strays or by Berlese or Winkler sampling, from leaf litter and rotten wood, but occasionally among epiphytes and moss (Rogeria belti, creightoni, Rogeria exsulans). Nests of several species (belti, Rogeria blanda, merenbergiana) have been found under the loose bark of rotten logs. Nests of blanda and Rogeria tonduzi have been taken from the trunks of cacao trees. A nest of Rogeria leptonana was found at 1750m under a rock in a pasture.

Nests are rarely found. Males are known for only four species (belti, blanda, leptonana and Rogeria stigmatica) and queens associated through nest series for only nine species.

Castes

Only known from workers.

Nomenclature

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

  • nevadensis. Rogeria nevadensis Kugler, C. 1994: 57, figs. 65, 94 (w.) COLOMBIA.

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 Paratype. TL 2.2-2.5 (2.2), HL 0.59-0.62 (0.59), HW 0.49-0.51 (0.49), SL 0.40-0.42 (0.40), EL 0.06-0.08 (0.06) (7-10 facets), PW 0.34-0.38 (0.34), WL 0.58-0.65 (0.58), SpL 0.09-0.10 (0.09), PetL 0. 22-0.25 (0. 22), PpetL 0.12-0.14 (0.12)mm, CI 0.81-0.83 (0.82), OI 0.13-0.15 (0.13), SI 0.82, PSI 0.15, MHI 0.93-0.95 (0.93). N=3

Kugler 1994 fig 63-70

Mandibles with 5 teeth plus two denticles, or six teeth plus 1-2 denticles among basal teeth; basal tooth not larger than penultimate basal. Eye elliptical. Nuchal groove weak. Promesonotum slopes to join dorsal face of propodeum without an angle or transverse carina; metanotal groove weak or absent. Propodeal spines narrow; a bisecting line passes through anteroventral corner of pronotum. Propodeal spiracle within one diameter of edge of infradental lamella. Petiolar ped uncle with indistinct keel. Postpetiolar node with a short vertical anterior face and long, sloping dorsal face; posterior face slightly concave in two paratypes. Postpetiole widest in anterior half as in Fig. 66. Postpetiolar sternum with flat ventral profile and somewhat prominent anterior edge. Sting shaft projecting from apex is like that of Rogeria inermis.

Laterodorsa of head rugose-areolate. Posterior head with transversely arching rugae. Head shiny with effaced microsculpture, especially on sides and back. Anterior pronotum crossed by several incomplete rugae. Lateral mesosoma with little distinct macrosculpture and smooth, shiny intervals. Dorsal face of propodeum with transverse rugae and effaced microareolate sculpture. Both nodes with weak, effaced microareolate sculpture and vague, vestigial rugose macrosculpture.

Mesosoma dorsum with 10-11 pairs of erect hairs; 2-3 pairs project posterodorsally from each node.

Color brown to dark reddish-brown (mesosoma and head dorsum may be darkest), with brownish-yellow appendages and frontoclypeal area.

Gynecoid Worker. —A nontype specimen is worker-like in most respects, but is larger (WL 0.70mm; PSI 0.19), has distinct mesonotal and metanotal sutures and partially formed wing attachments. Pronotum transversely rugose; mesoscutum longitudinally rugose. Sides of postpetiolar node from above more evenly convex.

Type Material

Holotype locality. COLOMBIA: Magdalena Department, SE Santa Marta, Cuchilla San Lorenzo, vicinity of EI Campano, 1340m, rain forest, VI-1976 (W. L. Brown) Museum of Comparative Zoology.

Paratype localities. 1 worker, same site as holotype [coated for SEM] MCZ. 1 worker, COLOMBIA: Magdalena, E Orihueca, 74.03W 10.55N, San Pedro de la Sierra, 1300m, rotten log in coffee plantation, 10-11-1977 (c. Kugler) Los Angeles County Museum of Natural History.

Etymology

Rogeria nevadensis takes its name from the Sierra Nevada de Santa Marta, site of the type localities.

References

  • Kugler, C. 1994. A revision of the ant genus Rogeria with description of the sting apparatus (Hymenoptera: Formicidae). J. Hym. Res. 3: 17-89 (page 57, figs. 65, 94 worker described)