Brachinus (Brachynolomus) devagiriensis, Akhil & Divya & Sabu, 2020

Akhil, S. V., Divya, M. & Sabu, K. Thomas, 2020, Bombardier beetles of genus Brachinus Weber, 1801 (Carabidae: Brachininae Brachinini) from India, Zootaxa 4816 (4), pp. 576-600 : 595-598

Brachinus (Brachynolomus) devagiriensis sp. nov.

Fig. 4

Type material. Holotype (male) labelled: “ Male; India: Kerala: Pattambi (KAU Campus , 10°48’42.9”N 76°11’25.7”E), ‘Light’, 14.XI.2016, coll. and det. S. V. Akhil ”, deposited in ZSIC ; Paratypes labelled “ Female, India: Kerala: Pattambi (KAU Campus , 10°48’42.9”N 76°11’25.7”E), ‘ Light’ , 14.XI.2016, coll. and det. S. V. Akhil ”, deposited in ZSIC ; labelled: “ Male; India: Kerala: Peruvannamoozhi (IISR station, 11°36’26.0”N 75°49’24.9”E), 02.ii.2017, coll. V. A. Jithmon, det. S. V. Akhil ” deposited in ZSIC .

Description: Length (TLA) 5.8–6.1 mm. Head, pronotum, scutellum and region around scutellum dark reddish brown; first two segments of antennae, palpi and legs pale reddish yellow (apical segments of palpi darker); femur, apex of tibiae and tarsi dark brown; antennal segments 3–4 dark reddish yellow, rest of the antennal segments reddish brown; lateral margin of pronotum and elytra black; eyes pitch black; genae, gula and prosternum dark reddish yellow; mesosternum, metasternum and abdominal ventrites brownish yellow.

Head broad, wider than long, sparsely pubescent, smooth, with very faint wrinkles; frons with frontal foveae setose, shallow, densely punctated (mid region finely punctated, with short setae), smooth; vertex very faintly wrinkled, glabrous; neck rough, densely punctated, pubescent; labrum rectangular, transverse, anterior margin straight, apical angles almost at right angle, having six setae at anterior margin with two long setae at the corners, four (2 long, 2 intermediate) setae in the middle, rest glabrous. Clypeus sub-rectangular, anterior angles obtuse, with one long setae on each lateral edge, minute setae in the anterior margin; fronto-clypeal suture well impressed, deep, intended. Mentum transverse with two triangular, large lateral lobes which are toothed laterally, a single long seta present at the apex of lateral tooth, rest of the mentum glabrous; lateral lobes pointed apically; mentum without median tooth. Submentum very narrow, glabrous. Antennae long, slender, reaching beyond the middle of elytra; segment 1 longest, segment 2 elongate oval, all the segments densely pubescent with a ring of long setae in the apex of the segments. Palpi with segment 2 longest, wide, rectangular; the entire segment pubescent, penultimate segment long, slender, in the shape of an inverted cone, apical segment conical, tapering towards apex. Mandibles stout, scrobe plurisetose, tip pointed, arcuate, not crossing. Eyes highly protruding, prominent. Genae evidently wrinkled except at the base, a few setae present below eyes, rest of the genae glabrous. Gula large, widening towards pronotum, gular suture divergent, well impressed.

Pronotum shiny, as long as wide, disc punctated, sparsely pubescent, smooth without wrinkles; disc apically sinuate without forward projection on lateral region of apical margin, disc straight at base, hind angles rounded, blunt, right angled; disc broad, laterally with anterior two-thirds convex and posterior third narrowed, with parallel sides; surface of disc convex; median groove deep, reaching both apical and basal margin; lateral bead narrow, widest near apical region.

Elytra subparallel, slightly narrowed towards base, shiny, densely punctated and densely pubescent with short yellow setae; humerus prominent, corners rounded; apex obliquely truncate without any re-entrant angle; scutellum long, narrow, pointed, glabrous; striations well marked, deep, carinate; intervals broad, convex/ carinate; suture not completely closed apically; setae present on striations as well as on intervals.

Hind wings well developed.

Legs strong, densely pubescent; protibial comb rounded with spur at the basal end of the comb. Two tibial spurs pointing inwards. Tarsi with article 1 longest, article 4 shortest.

Ventrally, pronotum smooth, pubescent, punctate. Prosternal process prominent, pubescent, extending beyond procoxae, apex pointing downwards. Ventral region densely punctate, pubescent with golden brown setae; hind coxae contiguous; abdomen rounded till apex, apex pointed; mesepisternum prominent, long and broad.

Sexual dimorphism. Symmetrically and diagonally arranged adhesive pads on male pro-tarsomeres 1, 2 and 3.

Male genitalia. Median lobe (in lateral view) straight in the basal half, sharply curving downwards towards the apex, with apex blunt, pointing straight rather than downwards.

Measurements. Holotype (male), TLA = 6.08 mm, TLB = 5.74 mm, PL = 1.10 mm, PW = 1.16 mm, EL = 3.60 mm, EW = 2.39 mm; Paratype (female), TLA = 5.81 mm, TLB = 5.74 mm, PL = 1.10 mm, PW = 1.18 mm, EL = 3.52 mm, EW = 2.48 mm.

Distribution. INDIA: Kerala: Pattambi, Peruvannamoozhi.

Collecting circumstances. Light-attracted, collected using low-intensity UV light trap.

Etymology. Named after the host institution of the authors.

Remarks. This new species is similar to B. dryas but differs in having rounded, obliquely truncate elytral apex without re-entrant angle, deeply impressed elytral striations, hind angle of pronotum right angled, blunt, not projecting laterally and strongly protruding eyes.

Figures

FIGURE 4. Brachinus devagiriensis sp. nov.: a) Dorsal habitus; b) Aedeagus (right lateral view); c) Aedeagus (left lateral view)