Anthracus leyteensis, Jaeger, 2017

Jaeger, Bernd, 2017, Five new species of the Anthracus annamensis group from the Philippines and India (Coleoptera, Carabidae, Harpalini, Stenolophina), Linzer biologische Beiträge 49 (1), pp. 585-608 : 602-606

Anthracus leyteensis nov.sp. ( Figs 36-44 )

T y p e m a t e r i a l: Holotype: 3 ( MCZ) labelled "Plains of / NE Leyte Is., P.I. / Nov '44-Jan '45 / Darlington" and " HOLOTYPE 3 / Anthracus / leyteensis nov.sp. / des. B. Jaeger 2017".

Paratypes: 1533, 7♀♀ ( MCZ, cJAE) with same locality label as the holotype, 1 3 additionally with the label "det. Darlington / at B.M. 1947-48 / Notes p." 1♀ ( MCZ) labelled " Tarragona , Leyte / P.I., IX-9-1945 / C.L. Remington / "at light" [hw]. 13 (cWRA) labelled " PHILIPPINES Mindanao Isl. / ( Aguasan del Sur Prov. ) / Aguasan marsh, Bayugan, / Mambalii, rest of lowland swamp"; rainforest/rice field, 25 m / N 08°11'52.2'' /E 125°56'98.4'' / 25./ 26.IX.2011 / S. Neumann & J.H. Lourens " ; "prosternum / schütter/fein / behaart / prost. process glatt" and "COLL. WRASE / BERLIN". All paratypes additionally labelled " PARATYPE 3 or ♀ / Anthracus / leyteensis nov.sp. / des. B. Jaeger 2017" .

E t y m o l o g y: The species name refers to the type locality.

D e s c r i p t i o n: General appearance as figured ( Fig. 36 ). Body length 3.7-4.2 mm (HT 4.1 mm); width 1.5-1.7 mm.

Shiny, pronotum and elytra moderately iridescent. Head reddish yellow or reddish brown, clypeus and labrum often somewhat paler, reddish yellow, and inner margins and apices of mandibles blackish. Pronotum either darker than head, or of same colour, reddish yellow, or dark reddish brown to dark brown, if darker than head, lateral margins and base, sometimes also a small stripe along median line more or less widely paler. Elytra reddish brown, with each elytron having a large blackish or blackish brown central macula, expanding laterally to interval 7 or 8, and leaving base, apex and first interval reddish brown. Legs, palpi and first two antennomeres yellowish brown, remaining antennomeres slightly infuscated. Ventral surface with head, prosternum, abdomen and epimera reddish yellow or pale reddish brown, other parts dark reddish brown.

Head ( Figs 36-38 ) including eyes moderately broad (HW/PW: 0.77-0.82), with eyes moderately prominent (head 1.56-1.62 times as wide as head between eyes). Labrum slightly rounded at apical margin. Mandibles medium sized, not distinctly prolonged and curved, left mandible rather obtuse at apex, but not markedly thickened or truncate. Antennae moderately long relative to pronotal (AL/PL: 2.28-2.52), and elytral length (AL/EL: 0.78-0.88). Microsculpture on labrum almost isodiametric to weakly transverse, on clypeus weakly transverse, on anterior half of head partly obliterated, partly with very lightly impressed isodiametric meshes, on posterior half posterior to eyes with lightly impressed isodiametric meshes, becoming moderately transverse in front of pronotal anterior margin.

Pronotum ( Figs 36-38 ) moderately transverse, 1.26-1.35 times as wide as long, 1.23-1.30 times as wide as head, widest in second quarter, lateral seta inserted about at beginning of second quarter. Apical margin almost rectilinear or slightly emarginate with anterior angles weakly projecting forward and narrowly rounded at tips. Sides moderately rounded to anterior angles, from widest point rectilinearly narrowed to posterior angles, which are more or less well marked, and more or less widely rounded at tips. Basal margin almost rectilinear, or very slightly convex medially, moderately oblique to posterior angles. Lateral furrows evenly narrow in anterior two thirds, and in posterior third rather markedly widened and fused with the baso-lateral impressions. Baso-lateral impressions small to moderately large and deep, clearly delimited from pronotal disc and the slightly depressed median part of base, flattened to basal and lateral margin. Basolateral impressions and other parts of pronotal surface impunctate. Median line fine, disappearing before reaching basal and apical margins. Anterior transverse impression at least suggested. Microsculpture on disc with traces of lightly impressed strongly transverse meshes, at baso-lateral impressions and lateral furrows with moderately impressed moderately transverse meshes.

Elytra ( Fig. 36 ) rather short, 1.50-1.56 times as long as wide, 2.78-2.94 times as long and 1.38-1.49 times as wide as pronotum, with sides weakly widened posteriorly, widest about at middle. Subapical sinuation weak to moderate, apical tip of each elytron narrowly rounded. Elytral striae distinctly impressed and impunctate, scutellar striole long. Intervals slightly convex on disc, becoming narrowed and moderately convex at apex. Basal pore at beginning of scutellar striole present, interval 3 in third quarter with one setiferous pore, adjoining stria 2. Microsculpture on scutellum isodiametric, on elytral intervals only here and there traces of very lightly impressed transverse lines rudiments visible. Macropterous.

Metepisterna at inner margin about 1.5 times longer than wide at basal margin. Prosternum medially with 5-6, and in front of apical margin with a row of 6-8 longer setae. Prosternal process posteriorly with 2 distinct setae. Abdominal sternites IV-VI with distinct and dense pubescence, in sternite IV often reduced laterally. Last visible sternite of males faintly emarginate and that of females almost rectilinear or very faintly emarginate at apex, at apical margin with 2 longer setae in males and 4 in females.

Protarsomeres 1-4 of males markedly dilated and with distinct, biseriately arranged adhesive hairs on ventral surface. Protarsomere 4 markedly bilobed. Mesotarsomeres 1-4 of males moderately dilated and with adhesive hairs on ventral surface, mesotarsomere 4 moderately bilobed. In females pro- and mesotarsomeres unmodified. Male profemora not thickened in relation to females, without a row of numerous long and fine setae at upper inner margin.

Median lobe of aedeagus ( Figs 39-44 ) rather large, with apical portion rather broad and short, with apex narrowly rounded in dorsal aspect ( Figs 42-43 ). In lateral aspect distinctly curved and apex with a distinct hook ( Fig. 40a ). Internal sac composed of 2 small and 2 large subapical teeth ( Figs 39-41 ), and one longitudinal row of 7-9 medium sized teeth at middle and one longitudinal row of 4-6 medium sized teeth at right side ( Figs 42-43 ).

C o m p a r i s o n s A. leyteensis nov.sp. belongs to the Anthracus annamensis group and represents the second maculate species of this group becoming known from the Philippines. In general appearance, it is very similar to A. philippinensis JAEGER, 2015 , which occurs sympatrically at least at Leyte, and probably also in Mindanao and other Philippine islands. It differs from this species usually by its darker colour, particularly of the pronotum and head, which are mostly dark brown or dark reddish brown and more rarely reddish yellow (as in A. philippinensis ), the larger size ( A. leyteensis usually> 3.9 mm, A. philippinensis <3,8 mm), the pronotal lateral furrows which are clearly widened in basal quarter, instead of being more less evenly narrow, and the elytra which are longer relative to pronotal length. Besides both species differ markedly in the shape of the median lobe and its internal structures. Due to the latter characters A. leyteensis is obviously not closely related to A. philippinensis , but probably to other maculate species known from Indonesia and continental SE Asia. From these species, it differs by its large size and/or different colour and body proportions, or the other shape and internal structures of the median lobe of the aedeagus.

D i s t r i b u t i o n A. leyteensis is so far known from the Philippine islands of Leyte and Mindanao.

Figures

Figs 36-38: Anthracus leyteensis nov.sp. Habitus, head and pronotum. (36) PT, Leyte, (37) HT, (38) PT, Mindanao.

Figs 39-44: Anthracus leyteensis nov.sp. Median lobe of aedeagus, dorsal and lateral aspects. (39) HT, (40, 43, 44) PTs, Leyte, (41, 42) PT, Mindanao.