Rogeria scandens

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Rogeria scandens
Scientific classification
Kingdom: Animalia
Phylum: Arthropoda
Class: Insecta
Order: Hymenoptera
Family: Formicidae
Subfamily: Myrmicinae
Tribe: Solenopsidini
Genus: Rogeria
Species: R. scandens
Binomial name
Rogeria scandens
(Mann, 1922)

A collection from Panama was taken from Heliconia.

Identification

Kugler (1994) - scandens species group. WL 0.93-1 .17mm. Eye very large (about 60-80 facets). Propodeal spines long (PSI 0.25-0.28). Petiole clavate, with rather large node (PetW/PetL 0.49-0.58). Postpetiole wide (PpetW/PpetL 1.38-1.61). Mesosoma and petiolar node strongly macro sculptured. Erect hairs with dentate ends.

Similar to Rogeria terescandens but terescandens differs by having: 1) Propodeal spines shorter, 2) petiolar node lower, more slender (PetW/PetL0.40-0.41), 3) postpetiole narrower (PpetW/PpetL 1.08-1.16), and 4) macrosculp ture very weak, especially on mesosoma and waist, and 5) eye slightly smaller.

Keys including this Species

Distribution

Honduras, Nicaragua and Panama

Distribution based on Regional Taxon Lists

Neotropical Region: Honduras (type locality), Nicaragua, Panama.


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

Males have not been collected.

Nomenclature

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

  • scandens. Macromischa scandens Mann, 1922: 30, fig. 14 (w.) HONDURAS. Wheeler, G.C. & Wheeler, J. 1986f: 493 (l.); Kugler, C. 1994: 39 (q.). Combination in Irogera: Kempf, 1961d: 438; in Rogeria: Kempf, 1965: 185.

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

Kugler (1994) - The Honduran and Panamanian specimens may be separate species. They differ slightly in shape of mesosoma and petiole, sculpture, and color, and the Honduran specimens are a little larger (WL 1. 13-1.17mm) than the Panamanian specimens (WL 0.93-1 .08mm). I prefer to call these geographic variants, however, until we have more specimens from more localities.

Description

Worker

Kugler (1994) - TL 3.5-4.2, HL 0.83-1.02, HW 0.70•0.85, SL 0.59-0.73, EL 0.17-0.20 (60-80 facets), PW 0.53-0.62, WL 0.93-1.17, SpL 0.23-0.30, PetL 0.42•0.55, PpetL 0.23-0.27mm, CI 0.82-0.86, OI 0.21•0.24, SI 0.84-0.86, PSI 0.25-0.28. N=6

Kugler 1994 fig 15-23

Mandible in most specimens with 5 teeth decreasing in size until large basal tooth. A denticle may appear between basal and penultimate tooth. Nuchal grooves shallow, not visible in lateral view. Metanotal groove in lateral view broad and shallow to absent; groove sometimes accentuated by a low transverse ridge at anterior of propodeum. Propodeal spines more strongly inclined in Honduran than Panamanian specimens. Metapleural lobes somewhat longer and narrower in Honduran specimens. Petiolar node slightly more distinct in Honduran specimens. Sting apparatus like that of inermis, except for wider anterior apodemes and a more rounded posterodorsal corners on spiracular plates and larger anterolateral processes on the sting base (pygidium and anal plate lost in preparation).

Median clypeus with additional 1-2 pairs of fairly distinct carinulae lateral to the usual pair for the genus. Posterior head longitudinally rugose (continuing from middorsum), transversely arching rugose, or transversely rugose-areolate. Interrugal spaces on head distinctly to weakly granular; microsculpture weaker and surface shinier on posterior. Oval area on ventral half of sides of head largely smooth and very shiny. Anterior surface and neck of pronotum smooth; rest of promesonotum with widely spaced longitudinal rugae, which become vermiculate on mesonotum. Rugae on Panamanian specimens not so vermiculate on mesonotum, and with lateral spurs. Sides of pronotum with parallel, upcurved carinae, which are more numerous and more distinct on Honduran specimens. Dorsal face of propodeum confused areolate or areolaterugose. Intervals in mesosoma macrosculpture smooth and shiny. Petiolar node heavily areolaterugose on sides and posterior face; sculpture weaker dorsad; no clear microsculpture. Postpetiolar node weakly rugose or rugose-areolate on sides and posterior surface, becoming weaker, sometimes absent toward midline; microsculpture vaguely microareolate to nearly smooth.

Scapes and extensor surfaces of legs without erect hair. Dorsa of head, mesosoma, nodes, and gaster Tl sparsely covered with fine appressed hair and longer, stiff, thick, erect-suberect hair with toothed apex. Mandibles, clypeus and terminal segments of gaster with long erect hair that is tapered and less stiff.

Color of Honduran specimens reddish-brown. Panamanian specimens blackish-brown. Appendages often lighter.

Queen

Kugler (1994) - TL 4.2, HL 0.95, HW 0.82, 5L 0.63, EL 0.22, PW 0.69, WL 1.20, SpL 0.28, PetL 0.50, PpetL 0.30mm, CI 0.86, SI 0.76, P51 0.23. N=l

Differing from the Panamanian workers in the usual queen characteristics. Pronotum transversely rugose. Mesonotum longitudinally rugose without cross-connections or vermiculate appearance.

Type Material

Kugler (1994) - Syntype workers, HONDURAS: Lombardia (Mann) National Museum of Natural History [5 of 6 syntypes examined].

References

  • Kempf, W. W. 1961g. Remarks on the ant genus Irogera Emery, with the description of a new species (Hymenoptera, Formicidae). Rev. Bras. Biol. 21: 435-441 (page 438, Combination in Irogera)
  • Kempf, W. W. 1965. Nota preliminar sôbre algumas formigas neotrópicas, descritas por Frederick Smith (Hymenoptera, Formicidae). Rev. Bras. Biol. 25: 181-186 (page 185, Combination in Rogeria)
  • Mann, W. M. 1922. Ants from Honduras and Guatemala. Proc. U. S. Natl. Mus. 61: 1-54 (page 30, fig. 14 worker described)
  • Wheeler, G. C.; Wheeler, J. 1986f. Supplementary studies on ant larvae: Myrmicinae (Hymenoptera: Formicidae). J. N. Y. Entomol. Soc. 94: 489-499 (page 493, larva described)