Carebara rectangulata

Nothing is known about the biology of .

Identification
Bharti & Kumar (2013) - Carebara rectangulata is allied to Carebara lusciosa and can be distinguished by following combination of characteristics: in major worker the head longer with straight and parallel sides, posterior margin of head with a transverse carina, katepisternum sculptured, body longer (TL 2.41mm), while its worker with occipital margin straight, eyes present; however, in major worker of C. lusciosa head suboblong with sub parallel sides which are somewhat sinuous in the middle, posterior margin of head without transverse carina, katepisternum smooth, body comparatively smaller (TL 2mm) and worker with posterior margin of head concave, and without eyes.

Distribution based on Regional Taxon Lists
Oriental Region: India.

Castes
Known only from the worker caste.

Nomenclature

 * . Carebara rectangulata Bharti & Kumar, 2013b: 56, figs. 19-24 (s.w.) INDIA (Jammu & Kashmir).
 * Type-material: holotype major worker, 10 paratype major workers, 2 paratype minor workers.
 * Type-locality: holotype India: Jammu & Kashmir, Bilawar, 32.611653°N, 75.608361°E, 650 m., 6.viii.2010, soil core (R. Kumar); paratypes: 9 major workers, 1 minor worker with same data, 1 major worker, 1 minor worker Jammu & Kashmir, Suriensar, 700 m., 1.viii.2010, soil core (R. Kumar).
 * Type-depositories: PUAC (holotype); BMNH, PUAC (paratypes).
 * Status as species: Bharti, Guénard, et al. 2016: 35; Akbar & Bharti, 2017: 37 (in key).
 * Distribution: India.

Worker
Major. Measurements. Holotype Ψ. HL 0.70, HW 0.47, SL 0.28, ML 0.16, MSL 0.60, PW 0.32, PTL 0.19, PPTL 0.14, PTW 0.15, PPTW 0.16, PTH 0.16, PPTH 0.12, GL 0.62, TL 2.41, CI 67.14, SI 59.57.

Measurements. Holotype Ψ. HL 0.70, HW 0.47, SL 0.28, ML 0.16, MSL 0.60, PW 0.32, PTL 0.19, PPTL 0.14, PTW 0.15, PPTW 0.16, PTH 0.16, PPTH 0.12, GL 0.62, TL 2.41, CI 67.14, SI 59.57.

Paratypes Ψ. HL 0.53-0.70, HW 0.37-0.47, SL 0.23-0.28, ML 0.14-0.16, MSL 0.46-0.60, PW 0.23-0.32, PTL 0.15-0.19, PPTL 0.12-0.14, PTW 0.11-0.15, PPTW 0.12-0.16, PTH 0.13-0.16, PPTH 0.10-0.12, GL 0.41-0.62, TL 1.81-2.41, CI 67.14-69.81, SI 58.14-62.16 (10 measured).

Head large, longer than broad, nearly rectangular in full face view, sides straight and parallel; posterior margin of head emarginated, concave, occipital corners without horns; clypeus steep, almost flat with anterior margin straight; mandibles triangular, masticatory margin with 5 teeth; frontal lobes developed and cover the condylar bulb; eyes minute with a single ommatidium, situated below mid-length of head at a distance of 0.15mm from mandibular insertions into head; antennae slender, nine segmented; scape short, just fail to reach half of the distance from antennal insertions to posterior margin of head and 0.4x of head length; promesonotum convex; promesonotum suture indistinct, mesonotum sloping backwards; metanotal groove broad and shallow; propodeum weakly concave, sloping backwards and with posterodorsal corners bluntly angled; declivitous face of propodeum vertical, weakly concave, with lateral raised margins; petiole with a long peduncle, ventral face straight, node broader than long and compressed antero-posteriorly in dorsal view; postpetiole convex, broader than long; gaster broadly oval.

Head, clypeus and mandibles smooth and shiny while genae longitudinally rugulose; head with punctures at the base of hairs; posterior margin of head with a transverse carina; frontal lobes finely longitudinally rugulose; clypeus with divergent lateral carinae; mesosoma, dorsum of petiolar and postpetiolar node, gaster, legs smooth and shiny except katepisternum and sides of petiole and postpetiole punctured.

Body yellowish brown with masticatory margin of mandibles blackish; whole body covered with abundant, short and long erect to suberect hairs, while scape, middle and hind tibiae with short suberect hairs only.

Minor. Measurements worker HL 0.37, HW 0.30-0.32, SL 0.21-0.22, ML 0.11-0.12, ED 0.01, MSL 0.38-0.39, PW 0.19-0.20, PTL 0.13, PPTL 0.08-0.10, PTW 0.08, PPTW 0.08-0.1, PTH 0.10, PPTH 0.07, GL 0.30-0.33, TL 1.38-1.43, CI 81.08-86.49, EI 3.13-3.33, SI 68.75-70.00 (2 measured).

Head slightly longer than broad, sides convex, posterior margin of head straight; masticatory margin with five acute teeth; eyes situated below mid-length of head at a distance of 0.11-0.12mm from mandibular insertions into head; scape falls short from posterior margin of head by 1/3 of its own length and 0.57x of head length; promesonotum weakly convex; metanotal groove deep and narrow; petiolar node rounded in dorsal view; postpetiole as broad as long.

Genae faintly longitudinally rugulose; posterior margin of head without a transverse carina. Whole body light yellowish brown in colour. Rest like major worker.

Etymology
The specific epithet refers to nearly rectangular head shape.

Type Material
Holotype major worker, India: Jammu and Kashmir, Bilawar, 32.611653°N 75.608361°E, 650m, 6.viii.2010, soil core; R. Kumar Leg.;. Paratypes. India. Jammu and Kashmir: Suriensar, 700m, 1 major worker, 01.08.2010, soil core, 1 worker, 01.08.2010, soil core; Bilawar, 650m, 9 major worker, 6.08.2010, soil core, 1 worker, 6.08.2010, soil core. R. Kumar Leg.; PUPAC.