Coridius adii Boyane, Ghate & Priyadarsanan, 2024

Boyane, Swapnil S., Sen, Sandeep, Priyadarsanan, Dharma Rajan, Thunga, Pavan Kumar, Joshi, Nikhil U. & Ghate, Hemant V., 2024, Integrative taxonomy of the genus Coridius Illiger, 1807 (Hemiptera: Heteroptera: Dinidoridae) reveals hidden diversity and three new species from North-East India, PLoS ONE (e 0298176) 1807 (7), pp. 1-46 : 15-16

Coridius adii Boyane, Ghate & Priyadarsanan , sp. nov. urn:lsid:zoobank.org: act:2A940B0F-7D83-4975-83EE-04718495F7C9 ( Figs 5B, 6B, 9B, 10B, 11B and 12B).

Etymology. This species is dedicated to the Adi tribe, one of the populous groups of Arunachal Pradesh, inhabiting mainly along the Siang valley, who consume this species for food.

Material examined: Holotype male. INDIA: Arunachal Pradesh, Rani Village, Pasighat , leg. Swapnil Boyane, 1.x.2018, 27.9653˚N, 95.316˚E, 139 m . Female unknown.

Diagnosis. Overall pale brown to dark brown with irregular patches of yellow on pronotum, and corium. Lateral margins of pronotum black, pronotum with a levigate pale line from posterior region of calli to mid-point of its length. First four segments of antennae black, minute regions at base and apex are ochraceous, fifth ochraceous except a minute region at base and apex which are brown ( Figs 5B and 6B). Connexival segments with yellow spot in between segmentation; ventrally, dark brown. Labium pale brown. Pleural area and area near spiracles dark brown or blackish brown. All legs yellowish brown, femora slightly darker, claws dark brown to black in distal half.

Description. Overall structure. Body finely punctate, region around calli smooth, shining; scutellum punctate rugulose, its apical region somewhat rounded. Prosternum with smooth flat region on either side of the median groove, laterally rugulose and coarsely punctate. Meso and metasternum smooth.

Head transverse, 1.92 times wider than long, mandibular plates longer than clypeus, rounded anteriorly and meeting in front of clypeus ( Fig 9B), dorsally with irregular folds and scattered punctures and very sparse golden setae. Eyes globular and pedunculate. Ocelli prominent, interocellar distance 2.16 times distance between eyes and ocelli. Antennae five segmented, first segment (0.87 mm) cylindrical with sparse setae surpassing apex of head, second (1.59 mm) and third (1.64 mm) subequal, compressed; second, third and fourth segments with longitudinal grooves and fine spine-like setae on the sides, fourth segment slightly dilated in basal half, fifth finely covered with numerous small and sparse long setae, pointed at the tip.

Labium four segmented, reaching anterior third of mesosternum. First (0.94 mm) and second (1.04 mm) segments subequal, third (0.80 mm) and fourth (0.72 mm) smaller, sub-equal. Bucculae prominent, raised above the level of labium.

Pronotum declivous, rugulose, punctate, somewhat shining. Anterior margin of pronotum concave behind head. Lateral margins almost straight, slightly raised. Humeral angles rounded, posterior margin of pronotum straight. Prosternum sulcate in the middle, its lateral area flat. Meso and metasternum smooth on disk with a shallow, rugulose median groove.

Scutellum 0.95 times longer than broad, apex broadly rounded, finely punctate, and longitudinally rugulose.

Hemelytra shorter than abdomen, clavus narrow, short, corium broad, finely, and closely punctate, rugulose. Membrane long and broad with numerous longitudinal veins. Legs laterally compressed; femora with spines ventrally, tibiae distinctly sulcate and spined ventrally as well as dorsally; first segment of tarsus densely setose, second and third with very sparse long setae; claws widely separated, pulvilli distinct, well developed.

Abdomen broad, seventh sternum longest. Spiracles black, closer to anterior margin than lateral margin of respective segment. Trichobothria distinct with a pair situated behind the pseudosuture, posterior to spiracle.

Male genitalia. Pygophore longer than broad, sclerotized, basally convex, flat in distal half. Ventral rim slightly notched, irregular and without setae ( Fig 10B), ventrally convex, smooth ( Fig 11B). Parameres broad, medially rounded, irregular on outer margin and apically narrowing with numerous long setae ( Fig 12B).

Geographical distribution. India. This species is known only from its type locality (Pasighat: Arunachal Pradesh).