Proceratium amazonicum

Distribution based on Regional Taxon Lists
Neotropical Region: Brazil.

Nomenclature

 *  amazonicum. Proceratium amazonicum Fernandes, Delabie & Fernández, 2019: 552, figs. 1, 2 (w.) BRAZIL.

Worker
Holotype measurements: SL: 0.52, HW: 0.70, HL: 0.79, EL: 0.03, WL: 0.86, PW: 0.48, PtL: 0.28, PtH: 0.26, PtW: 0.28, LT3: 0.35, LT4: 0.60, LS4: 0.18, GL: 0.97, TL: 3.39, CI: 88, OI: 4, SI: 65, IGR: 0.30, ASI: 171, DPeI: 100.

Head longer than broad; sides slightly narrower anteriorly than posteriorly. Vertex in full face view convex. Clypeus recognizable as small triangular or subtriangular tooth between antennal sockets. Frontal carinae close to each other, not covering antennal insertions. Lateral expansions of the frontal carinae relatively narrow, raised and diverging posteriorly. Frontal triangle elevated. Genal carinae strongly marked. Sulcus between genal carinae and gular area impressed. Eyes present, composed of 6−7 convex facets slightly below midline of head. Scapes thicker in distal half and far short of vertexal margin. First funicular joint 1/4 longer than broad. Mandible with 4 denticles including the apical tooth.

Mesosoma slightly elongate. Promesopleural and mesometapleural sutures weakly impressed. Propodeum with elevated tumosity (tumulus) on apex, before the declivity. Declivous face of propodeum flat, sides crenulate and concave close to propodeal lobes. Propodeal lobe semitransparent. Propodeal spiracle tumuliform. Petiole slightly longer than broad, with sides subparallel in anterior third and convex posteriorly in dorsal view. Anterior border of petiole straight. In lateral, view of the basal area of petiole slightly smaller than the apex. Ventral process of petiole triangular, semitransparent and sharply pointed. Abdominal segment III (G1 tergite) slightly shorter than 1/3 length of abdominal segment IV (G2 tergite), in lateral view. Abdominal segment III (G1 sternite) with ventral carina, close to anterior border. Abdominal segment IV (G2 sternite), ventrally with marked subround convex projection. Abdominal segment IV (sternite) slightly convex. Constriction between abdominal segments III and IV strongly impressed. Abdominal sternite III very short medially, carinate and protruding anteriorly on sides.

Mid tibiae without pectinate spur. Spurs of fore legs without basal spine. Fore basitarsi longer than mid and hind ones. Pretarsal claws simple. Arolia small.

Sculpture. Head, mesosoma, petiole and gaster densely foveolate. Legs foveolate.

Body covered by hairs of three main types: (1) short, dense, subdecumbent on whole body, very dense on dorsal face of propodeum tumulus, sparse and erect on funicular joints; (2) long, erect or suberect on petiole and on abdominal segment III (G1 sternite, lateral view); sparse on whole body, absent from tumulus of basal face of propodeum and on antennae. Appressed, short and sparse hairs present on head.

Colour ferrugineous-brown with slightly lighter antennae and legs.

Etymology
“amazonicum” is a neologism indicating the provenance of this species from the Amazon (Rondônia state).