Temporal range: Burdigalian, Early Miocene Dominican amber, Dominican Republic
(Vierbergen & Scheven, 1995)
A member of the emeryi clade characterised, in the worker, by the long, flexuous hairs, by the pronotal sides with a broad, pointed triangular tooth and by HBaI < 35.0. Cephalotes jansei is very similar to Cephalotes serratus but it has the pronotal lamellae with a pair of broad, triangular teeth, the gaster with short anterolateral lobes and HBal < 35.0. (de Andrade and Baroni Urbani 1999)
Keys including this Species
This taxon was described from Dominican amber, Dominican Republic (Burdigalian, Early Miocene).
The following information is derived from Barry Bolton's New General Catalogue, a catalogue of the world's ants.
- †jansei. †Exocryptocerus jansei Vierbergen & Scheven, 1995: 161, fig. 4 (w.) DOMINICAN AMBER (Miocene). Combination in Cephalotes: De Andrade & Baroni Urbani, 1999: 526.
- Holotype: Staatliches Museum fur Naturkunde Stuttgart, no. Do-5688 (ex Coll. SCHEVEN).
- Paratype worker in Museum of Comparative Zoology, reference number MCZC-4, examined by de Andrade and Baroni Urbani (1999).
Unless otherwise noted the text for the remainder of this section is reported from the publication that includes the original description.
de Andrade and Baroni Urbani (1999) - Head subquadrate. Frontal carinae strongly but sparsely crenulate, not upturned above the eyes. Vertexal angles with a truncate, crenulate lamella. Vertexal margin concave. Vertex with a small pair of denticles. Mandibles laterally angulate.
Mesosoma. Scapular angles present. Anterior pronotal border straight. Pronotal sides with a broad, pointed, triangular teeth. Promesonotal suture marked. Sides of the mesonotum straight and with a pair of posterior angles. Propodeum with differentiate basal and declivous faces; sides of the basal face marked anteriorly and posteriorly by an angle; sides of the declivous face converging posteriorly.
Petiole. Anterior face truncate, posterior face gently concave medially; petiolar sides with a pair of minute denticles. Postpetiolar node also weakly concave in the middle; anterior half of the postpetiolar sides with a pair of round, broad teeth arising from the anterior border of the postpetiole and directed laterally.
Gaster suboval, with a minute pair of anterior lobes.
Fore coxae angulate. Mid and hind femora without angle or denticles. Mid and hind basitarsi flat and with slightly broad base.
Sculpture. Head and mesosoma minutely punctate and with superimposed dense, irregular foveae; this sculpture on the posterior half of the mesonotum and on the anterior part of the propodeum is superimposed to irregular, longitudinal rugosites. Peduncular segments with the same sculpture as on the head dorsum but with smaller foveae. Frontal carinae with the same type of sculpture as on the head dorsum but more superficial. Ventral face of the head punctate and with irregular, superficial foveae and rugosities. Gastral tergites and sternites reticulate; the reticulation more superficial on the center of the first gastral sternite. Legs strongly reticulate and with superimposed irregular, faint rugosities.
Pilosity. Each fovea with a long, thin, pointed, flexuous hair; hairs similar or longer but denser on the legs and on the gaster and on the crenulation of the frontal carinae.
Measurements (in mm) and indices: TL 4.69-5.48; HL 1.22-1.32; HW 1.50-1.77; EL 0.27-0.30; PW 1.48-1.52; PeW 0.50; PpW 0.52-0.60; HBaL 0.52-0.63; HBaW 0.16-0.22; CI 122.9-134.1; PI 101.3-116.4; PPeI 296.0-304.0; PPpI 246.7-292.3; HBaI 30.8-34.9.
- de Andrade, M. L.; Baroni Urbani, C. 1999. Diversity and adaptation in the ant genus Cephalotes, past and present. Stuttgarter Beitrage zur Naturkunde Series B (Geolgie and Palaontologie). 271:1-889. (page 526, Combination in Cephalotes)
- Vierbergen, G.; Scheven, J. 1995. Nine new species and a new genus of Dominican amber ants of the tribe (Cephalotini Hymenoptera: Formicidae) [sic]. Creat. Res. Soc. Q. 32: 158-170 (page 161, fig. 4 worker described)