Simplocarina angolensis Matsumoto, 2021

Matsumoto, Keita, 2021, New species and records of Angolan Limnichidae (Coleoptera: Byrrhoidea), Zootaxa 4985 (1), pp. 111-117 : 112-114

Simplocarina angolensis Matsumoto sp. nov. [ Figures 6‒9 ]

Type locality. Angola, Kangumbe , Lungué-Bungo River .

Type materials. Holotype male, deposited at BMNH “ ANGOLA 1298m, Kangumbe , Lungué-Bungo River, 12.58449S, 18.66771E; 18-21.xi.2019, // General Coll., Matsumoto,K., James, H., Diedericks,G. leg. Okavango Wilderness Project, BMNH (E) 2020-30” with unique identification number “NHMUK014372343”. Additional label on red paper added “ Simplocarina angolensis sp. nov. K. Matsumoto det. 2020 HOLOTYPE ♂ ”.

Description of holotype, male. Body: Elongate, oval, dorsum convex, BL: 2.5 mm, EL: 2.1 mm, EW: 1.9 mm, PL: 0.6 mm, PW: 1.4 mm and HW: 0.7 mm. Colour: Dorsal side black; venter brown to dark reddish brown, tibia brown, tarsal claws light brown.

Dorsum. Overall surface covered with mixture of white and light brown setae emerging from the punctures. Head: Partially retracted into pronotum; dense punctuations present across surface, surface between punctures smooth. Antennae: 11 segmented, filiform, fully pubescent, antennomeres long and slender, 1st AS widest and largest, 2nd AS slightly narrower than 1st AS, 3rd to 7th AS increase in width, 11th AS oval. Pronotum: Transverse, widest at posterior, narrowest at anterior, narrower than elytra; anterior margin concave, posterior margin gently sinuate; lateral margin nearly convex; surface covered with moderately dense punctation, surface between punctures smooth and shiny. Scutellum: Subtriangular, large, lateral sides nearly straight. Elytra: Longer than wide; anterior margin sinuate; anterior lateral angle acute; lateral margins moderately curved from anterior end to anterior 2/3, curvature decreases towards the apex; surface with small dense punctuation across surface; elytral striae not visible; surface between punctures smooth and shiny.

Venter. Overall surface with moderately dense punctures with setae emerging from the punctures. Prosternum: Concave on anterior margin; prosternal process twice as wide as long, lateral margin concave, posterior margin acute. Mesoventrite: Wider than long, narrows towards posterior; anterior margin concave where prosternal process fits, discrimen very small; lateral sub-parallel and gently curved, posterior nearly flat, anterior tri-sinuate. Metaventrite: Long and wide, flat in the middle; discrimen not visible. Abdomen: Five clearly visible ventrites. Intercoxal process sinuate with pointed apex. Posterior margin of 1st and 2nd ventrites convex, 3rd to 4th ventrites slightly concave, 5th ventrite nearly semi-circle. Surface covered with long, light yellow, recumbent setae.

Legs. Tibiae: Outer lateral and inner lateral margin gently convex. Tarsi: Simple, segments increase in length towards the apex. Tarsal claws: Short, narrow, symmetrical.

Genitalia. Aedeagus long, gently curved in lateral view, and narrows relatively sharply from middle to apical end. Median lobe: Wide in lateral view, pointed at apex, longer than the parameres. Parameres: Apical emargination fused, apex semi-oval in ventral view, inner margin sinuates in lateral view.

Female. Unknown.

Distribution. Simplocarina angolensis Matsumoto sp. nov. is known only from the type locality ( Figure 13 for habitat).

Etymology. The species named after Angola, where it was collected.

Remarks. This new species is the second species of this genus.

Differential diagnosis. Key to differentiate between Simplocarina curticollis Pic, 1922 and Simplocarina angolensis Matsumoto sp. nov.: 1. Outer margin of the elytra gently curved. Overall body shape more or less oval. In males the ratio of AB and BC for the genitalia is 3.7. Length of genitalia from apex of median lobe to the base of phallobase 0.70 mm. PL/EL = 3.6. Median lobe sharply pointed and slightly slender.......................................... Simplocarina angolensis Matsumoto sp. nov. – Outer margin of the elytra gently rounded. Overall body shape nearly circular. In males the ratio of AB and BC for the genitalia is 2.0-2.2. Length of genitalia from apex of median lobe to the base of phallobase 0.80-0.83 mm. PL/EL = 3.8 to 4.0. Median lobe slightly blunted and slightly broader........................................ Simplocarina curticollis Pic, 1922

Figures

Figures 6‒9. Simplocarina angolensis Matsumoto sp. nov. 6, Dorsal habitus; 7, abdomen; 8, genitalia, ventral; 9, genitalia, lateral.

Figures 13‒14. Limnichidae habitat. 13, Kangumbe, Lungué-Bungo River; 14, Cassamba, near Luio River.