Rogeria besucheti

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

Rogeria besucheti P casent0900956.jpg

Rogeria besucheti D casent0900956.jpg

Specimen Label

Paraguayan specimens come from gallery forest with some bamboo. Peruvian specimens are from mixed broadleaf primary forest on a steep hillside at 1000m. In both localities collections resulted from Berlese and Winkler sampling of leaf litter and rotten wood.

Identification

Kugler (1994) - stigmatica species group. WL 0.67-0.75mm. Eye small (8-10 facets). Propodeal spiracles small, more than 3/4 diameter from infradental lamella. PSI 0.17-0.20. Metapleural lobes well developed. Inferior petiolar process a small step. Head, mesosoma, nodes and gaster with abundant decumbent pilosity and more sparse erect hairs.

Rogeria besucheti differs from Rogeria ciliosa, Rogeria gibba, Rogeria prominula, and Rogeria blanda in pilosity. It differs from Rogeria stigmatica and Rogeria megastigmatica in mesosoma shape, propodeal spine length, and generally smaller eye size.

Keys including this Species

Distribution

Paraguay and Peru.

Distribution based on Regional Taxon Lists

Neotropical Region: Paraguay (type locality).

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

Known only from workers.

Nomenclature

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

  • besucheti. Rogeria besucheti Kugler, C. 1994: 36, figs. 15-16 (w.) PARAGUAY.

Description

Worker

Holotype and Paratype - TL 2.7-3.1 (2.85), HL 0.65-0.71 (0.66), HW 0.59-0.63 (0.60), SL 0.43-0.49 (0.44), EL 0.05-0.08 (0.06) (8-10 facets), PW 0.42-0.46 (0.43), WL 0.67-0.75 (0.69), SpL 0.12-0.15 (0.13), PetL 0.30-0.34 (0.32), PpetL 0.16-0.18 (0.18)mm, CI O.87-0.90 (0.90), OI 0.08-0.13 (0.10), SI 0.72-0.78 (0.72), PSI 0.17-0.20 (0.18). N=7

Holotype mandible with 5 visible teeth decreasing in size basad. In paratypes, mandibles always with 3 apical teeth, but basal teeth may have additional denticles or be replaced by pairs of denticles. Palpal formula 3,2. Clypeal apron truncate; body of clypeus projecting enough to block view of apron in full dorsal view. Pronotal shoulders rounded. Shallow metanotal groove shallow present on dorsum and sides of mesosoma. Propodeum lacking a distinct transverse carina at anterior

Kugler 1994 fig 15-23

border. Peduncle of petiole with weak ventral keel; inferior process reduced to a small step. Petiolar node bulbous, wider than long. Postpetiolar node widest in anterior half (as in Fig. 74). Postpetiolar sternum short, anterior lip not greatly prominent. GW /WL 0.91-0.98. Terminal segments of gaster slightly rotated ventrad, but not enough to make T3 the distalmost point of the gaster. Sting apparatus much like that of ciliosa (Fig. 3), but: 1) anterior apodeme of spiracular plate widest mid length, 2) anterodorsal corner of quadrate plate longer, narrower, 3) anterior apodeme of oblong plate longer, 4) gonostylus a little longer, with two companion setae and less distinct gap in setation and 5) sting base lower and without anterolateral processes (Fig. 16).

Longitudinally rugose macrosculpture on frontal lobes becomes rugose-areolate on middorsum. Laterodorsa, sides, and posterior head areolate with rather small areolae; intervals smooth and shining, except for piligerous punctures. Pronotal disc varies from all rugose-areolate to all areolate. Rest of promesonotum slightly less coarsely areolate. Intervals smooth, except for piligerous punctures. Dorsal face of Propodeum densely microareolate, with or without overlying transverse rugulae.

Dorsum and anterior face of petiolar node smooth; rest of petiolar and postpetiolar nodes effaced areolate. Gaster predominantly smooth and shiny; T1 and Sl with piligerous punctures that in some specimens become weaker caudad. Remaining terga and sterna very weakly roughened and shiny.

Paraguayan specimens have suberect hair on scapes; others do not. Head dorsum with suberect hairs. Pilosity on mesosoma dorsum and nodes ranges from short and decumbent to long and erect; all curving quite strongly toward midline. Gaster T1 similar, but with no erect hairs. Terminal segments of gaster with rather dense erect hair and decumbent pilosity. No hair on ventral petiole.

Extremities and mandibles light brownish yellow. Rest of body brown with more yellowish than reddish accents; frontoclypeal area and terminal segments of gaster lighter.

Type Material

Paratype Specimen Labels

Holotype locality. PARAGUAY: Alto Parana Province, Puerto Santa Teresa, 3-XI-1979 (F. Baud, et al.) Musee d'Histoire Naturelle Genève.

Paratype localities. COLOMBIA: 3 workers, Putumayo Department, Villa Garzón, 23-VII –1977 (D. Jackson) The Natural History Museum . PERU: 2 workers, Pasco Department, near Pozuzo, 1000m (c. Kugler and R. R. Lambert) [mouthparts, sting] Museum of Comparative Zoology, Museu de Zoologia da Universidade de Sao Paulo. PARAGUAY: 1 worker, San Benito Province, Itapua, 29-X-1982 (F. Baud, et al.) MHNG.

Etymology

This species is named for Claude Besuchet, who as director of the Musee d'Histoire Naturelle Genève in Geneva was most helpful and patient in loaning material valuable for this work.

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 36, figs. 15-16 worker described)