Endustomus sanjensis, Matsumoto & Háva, 2021

Matsumoto, Keita & Háva, Jiří, 2021, A new species of Endustomus Brême, 1842 and new records of Afrotropical Cossyphini Latreille, 1802 (Coleoptera: Tenebrionidae), Zootaxa 5016 (1), pp. 133-141 : 134-138

Endustomus sanjensis sp. nov.

( Figs. 1 , 11A‒11C , 21‒25 )

Type material. Holotype ♂, deposited at BMNH: “ TANZANIA vi.00 Sanje , Udzangwa Mts. Pitfall. UDSM coll. // BMNH 2012-92 1191597 // NHMUK014377648”. Additional label on red paper added “ Endustomus sanjensis sp. nov. K. Matsumoto & J. Háva det. 2020 HOLOTYPE ♂ ”.

Description. Body. Elongate, oval, dorsum on outer part nearly flat and inner part slightly convex. BL: 16.0 mm, EL: 9.5 mm, EW: 8.2 mm, PL: 6.4 mm and PW: 7.9 mm. Colour. Dorsal side brown to light brown; venter brown to light brown, tibia brown, tarsal claws brown. Dorsal and ventral surface covered with very short setae.

Dorsal side ( Fig. 1 ). Head: Retracted into the extension of anterior part of the pronotum and prosternum. Antennae: 11 segmented, capitate; 1 st AS square-shaped; 2 nd AS shortest and nearly circular; 3 rd to 7 th AS similar sized, trapezium-shaped with anterior end widest; 8 th AS trapezium-shaped, wider at anterior; 9 th AS trapezium shaped, wider at anterior, widest than rest of the AS; 10 th AS narrow and similar length as 2 nd AS, slightly concave on anterior; 11 th AS similar width to 8 th AS and oval. Pronotum: Pronotal lamina semi-oval, lateral sides nearly straight, posterior lateral angle right angled, surface with small, densely packed punctures. Pronotal sulcus deeply concave inwards. Carina of the pronotal bulge not visible. Pronotal bulge very faint and not clearly visible. Carina of the pronotal bulge extending from anterior 1/4 to posterior 1/4. Surface covered with very short setae. Scutellum: Triangular, wider than long. Elytra: Longer than wide, narrow oval, apex acute; carinae very faint, extending from anterior base to posterior 1/4. Flange constant width, lateral margin from anterior end to middle nearly straight, gently curved from middle to the apex, anterior lateral angle right angled, apex acute, inner margin near the apex gently convex.

Ventral side. Prosternum: Prosternal extension covers the head, concave on anterior margin. Prosternal process as wide as long, concave in the middle, acutely angled outwards at the procoxae, posterior lateral sides relatively straight towards the posterior, apex semioval. Basal expansion of the prosternum with small punctures across surface. Mesoventrite: Wider than long, width relatively constant, sulcus present on both sides and curved inwards, posterior end between the meso-coxae nearly flat and slightly concave just before the apex. Metaventrite: Wider than long, concave at the middle.Abdomen: Five clearly visible ventrite, width relatively constant. Posterior margin of 1 st and 2 nd ventrites convex, 3 rd to 4 th ventrites slightly concave, anal ventrite flat with lateral sides curved. 1 st and 2 nd ventrite similar length and size, 3 rd ventrite slightly shorter than 1 st and 2 nd ventrites; 4 th ventrite shortest, anal ventrite longest. Surface covered with very short, light yellow setae. Legs. Tibiae: Long and thin, surface covered with very short setae. Light pubescence extending almost throughout the length on the metatibia ( Fig. 25 ). Femora: Long and thin, surface covered with very short setae. Tarsi: tarsal formula 5-5-4, simple, last segment largest and longest, other segments similar length and size. Inner end of 5 th protarsi with short bulge ( Fig. 24 ). Tarsal claws: Long, narrow, symmetrical.

Abdominal organs. Eighth urites outer margin m-shaped with middle concave, anterior lateral margin convex, inner middle projection semi-circle ( Fig. 22 ), apical end apiculate, apical emargination shallow V-shaped, anterior margin gently curved ( Fig. 23 ).

Male genitalia. Forceps copulatrix is asymmetrical, one extension slightly longer than other, concave section on the basal ( Fig. 21 ). Phallobase: Nearly symmetrical, lateral end nearly parallel, basal end rounded. Parameres: Asymmetrical; left section strongly directed laterally, narrowing towards the apical end, as long as wide and lateral end shallow convex in ventral view; right section directing ventrally, longer than wide and sinuate on both lateral ends in ventral view, apical end convex on lateral view. Median lobe: Widest at base, as wide as long, narrowing towards the apical end in ventral view ( Figs. 11A‒11C ).

Female. Unknown.

Etymology. This new species is named after the type locality, Sanje in Tanzania.

Distribution. Endustomus sanjensis sp. nov. is known only from the type locality (Sanje, Tanzania).

Differential character diagnosis. The new species belongs to the grandicollis group. According to Scupola (2006), this group is characterised by: Strong asymmetry of the apex of the aedeagus, reduced or absence of bulge on onyx, peculiar modification of the eighth urites of the male, the absence of punctuation on the body surface, the absence of foveole on the elytral marginal stria which appears smooth, the reduction or absence of the elytral carinae or the considerable development of the keels which appears spatuliform, carinae on the middle of the pronotum, sexual dimorphism on pseudopleuras, larger body dimensions compared to Cossyphus .

The new species differs from the other species of the grandicollis group: 1. eighth urite of male: sanjensis — shallow V-shaped, magnicollis —shallow V-shaped, gebieni —deep V-shaped, grandicollis —V-shaped and apical ends pointing to each other; 2. parameres: sanjensis —long and extending laterally and anteriorly ( Figs. 11A‒11C ); magnicollis —short and extending laterally and anteriorly ( Figs. 12A‒12C ); gebieni —short and extending laterally and anteriorly ( Figs. 13A‒13C ), grandicollis —short and extending towards one side ( Figs. 14A‒14C ).

Modified key for Endustomus grandicollis group, adapted from Scupola (2006), is given below:

31. Hind tibiae of male hairy or pubescent, covered on the inner side by pale setae, strongly developed................... 32

‒ Hind tibiae of male not pubescent or hairy. Prothorax subquadrate with narrow base and basal angles evidently projecting (see Scupola, 2006: Fig. 76C). Apices of flange sub-contiguous but with internal margin concave “tong-shaped” (see Scupola, 2006: Fig. 2n ). Flange crenulate in correspondence of the junction with the pseudopleuron. Elytron with two longitudinal carinae. Aedeagus (see Scupola, 2006: Fig. 30). Eighth urite of male (see Scupola, 2006: Fig. 63). Length 11 mm. Mozambique, Zimbabwe, South Africa (Transvaal).......................................... E. grandicollis (Gerstaecker, 1855)

32. Eighth urite of male (see Scupola, 2006: Fig. 67). Aedeagus (see Scupola, 2006: Fig. 32.). Apices of flange less developed (see Scupola, 2006: Fig. 76B). Length 16 mm ................................................................. 33

‒ Eighth urite of male (see Scupola, 2006: Fig. 66). Flange with strongly prominent margin. Apices of flange more developed and divaricate (see Scupola, 2006: Fig. 76A)...................................................................34

33. Aedeagus asymmetrical; left parameres strongly directed laterally, narrowing towards the apical end, as long as wide and lateral end shallow convex in ventral view; right parameres directing ventrally, longer than wide and sinuate on both lateral ends in ventral view, apical end convex in lateral view ( Figs. 11A‒11C ). Lateral margin of flange gently curved from the middle to the apex; apex of elytra acutely angled ( Fig. 1 ). Tanzania.......................................... E. sanjensis sp. nov.

‒ Aedeagus asymmetrical; left parameres weakly directed laterally, narrowing towards the apex, as longer than wide and lateral end almost semi-circular in ventral view; right parameres directing ventrally, longer than wide and sinuate on both lateral ends in ventral view, apical end pointed in lateral view ( Figs. 12A‒12C ). Lateral margin of flange strongly curved from the middle to the apex; apex of elytra closer to right-angled ( Fig. 2 ). Kenya and Tanzania............ E. magnicollis Fairmaire, 1887

34. Aedeagus (see Scupola, 2006: Fig. 31). Tanzania, Mozambique........................ E. gebieni gebieni Reitter, 1917 ‒ Aedeagus (see Scupola, 2006: Fig. 35). Tanzania................................. E. gebieni daccordii Scupola, 2006

Figures

FIGS. 1‒10. Dorsal habitus of Afrotropical Cossyphini. 1) Endustomus sanjensis sp. nov.; 2) Endustomus magnicollis Fairmaire, 1887; 3) Endustomus gebieni gebieni Reitter, 1917; 4) Endustomus grandicollis (Gerstaecker, 1855); 5) Endustomus nimbaensis Ardoin, 1963; 6) Endustomus integrinus Reitter, 1917; 7) Endustomus rhodesianus Péringuey, 1904; 8) Endustomus senegalensis Laporte de Castelnau, 1833; 9) Endustomus parallelogrammus parallelogrammus Fairmaire, 1888; 10) Cossyphus (Cossyphus) moniliferus moniliferus Chevrolat, 1829.

FIGS. 11‒20. Male genitalia of Afrotropical Cossyphini. 11) Endustomus sanjensis sp. nov.; 12) Endustomus magnicollis Fairmaire, 1887; 13) Endustomus gebieni gebieni Reitter, 1917; 14) Endustomus grandicollis (Gerstaecker, 1855); 15) Endustomus nimbaensis Ardoin, 1963; 16) Endustomus integrinus Reitter, 1917; 17) Endustomus rhodesianus Péringuey, 1904; 18) Endustomus senegalensis Laporte de Castelnau, 1833; 19) Endustomus parallelogrammus parallelogrammus Fairmaire, 1888; 20) Cossyphus (Cossyphus) moniliferus moniliferus Chevrolat, 1829. A = genitalia, dorsal view; B = genitalia, ventral view; C = genitalia, lateral view.

FIGS. 21‒25. Holotype of Endustomus sanjensis sp. nov. 21) forceps copulatrix; 22 & 23) eighth dorsal urites; 24) left metatibia, ventral view; 25) protarsus.