Anisocentropus (Anisocentropus) samuh, Oláh & Johanson, 2010

Oláh, János & Johanson, Kjell Arne, 2010, Description of 33 new species of Calamoceratidae, Molannidae, Odontoceridae and Philorheithridae (Trichoptera), with detailed presentation of their cephalic setal warts and grooves 2457, Zootaxa 2457 (1), pp. 1-128 : 49-52

Anisocentropus (Anisocentropus) samuh , new species

Figs 99–104

This species is very similar to Anisocentropus voeltzkowi Ulmer from Madagascar. In the genus Ganonema and the Anisocentropus latifascia diagnostic species-group, the shape of the genitalia is rather uniform, and the wing and body colour, as well as wing shape and forewing pattern, are effectively used to discriminate species. The genitalia of Anisocentropus samuh , new species are nearly identical with those of Anisocentropus voeltzkowi only differing in the presence of a more developed median, finger-like, small process at the intersegmental depression between segment IX and segment X, as seen in lateral view; and the gonocoxites are more quadrangular. The most striking difference between the 2 species is the larger size and presence of dark brown-banded forewings.

Male (pinned). Medium-sized, body light brown-ochraceous; legs, palps and antennae lighter than body; forewings with wide, dark, subapical band. Head rectangular in dorsal view, slightly shorter than broad. Ocelli absent. Facial groove pattern modified, with plate-like flange, or rim, of frontal sclerite between anterior tentorial pits. Theoretical lines separating frons and clypeus manifested by transverse frontal rim. Frontogenal vertical groove forming oblique, dorsal continuation from anterior tentorial pits; almost horizontally merging with antennal grooves. Clypeogenal vertical grooves located ventrally of anterior tentorial pits, short, running slightly mesoventrad; plate-like flanges, and frontogenal and clypeogenal sutures forming complex of anterior tentorial arms (frontogenal septa). Subantennal grooves small, sinuous, running almost horizontally between frontogenal compact setal wart and palpifers, forming proximal articulation of palpi on stipes. Subocular grooves invisible. Frontal groove pronoumced, short, present between antennae, joining vertexal medioantennal compact setose warts. Vertexal groove pattern reduced; large, anterad directed, rounded elevated hump dominating on anterior half of vertex, reaching interantennal area; laterally delineated by large membranous antennal sockets with corrugated or granulous surface near frontogenal compact setose wart. Epicranial groove (coronal groove) with vestigial stem. Antennal and ocular grooves accompanied by occipito-postgenal grooves, partly merging anteriorly; tangential to large occipital compact setal warts. Labrum triangular, distal half narrow, freely hanging. Mandibles long, weakly pigmented, orienting laterad along each labrum; laciniae narrow, elongated, with few setae. Frontal setal warts absent; frontal interantennal warts absent due to forward directed vertexal elevation. Pair of large, nearly triangular frontogenal compact setal warts present on posterior pregenae, obliquely or almost horizontally from frontogenal grooves, representing only compact warts visible on face. Triangular elevation on vertex with fused vertexal medioantennal compact setose warts present anteriorly on head. Vertexal lateroantennal compact setal warts absent. Antennal sockets large; pair of rounded vertexal ocellar compact setose warts and pair of small vertexal, medioocellar setose warts present, with 1 or 2 setae in middle of vertex. Pair of large, obliquely located, ovoid occipital compact setose warts dominating on posterior half of vertex. Pair of small postgenal compact setose warts visible between posterior section of ocular grooves and occipital compact setose warts. Maxillary palps filiform, each segment with long setae, maxillary palp formula II-IV-I-VI-V-III. Scapes rounded, about half as long as head; pedicels 2/ 5ths as long as scapes. Two pairs pronotal warts present: pair of large dorsal transverse ovoid pair almost touching mesally; pair of small, rounded warts located deep laterally, visible in lateral view. Mesoscutum with 1 pair diffused warts, arranged in longitudinal line along entire mesoscutum, composed of single, double and triple setae in groups visible as weakly pigmented alveoli. Pair of mesoscutellar warts forming small, weakly pigmented, rounded area with 5 to 6 setal alveoli. Each proepisternum with minute, rounded setose wart located proximally, above articulation of cervical sclerites. Large, compact setal warts present mainly on membranous part of cervix, touching anterior arm of cervical sclerites. Lateral cervical sclerites forming narrow anterior arms, articulating anteriorly with back of head, with occipital condyle above posterior tentorial pits; fusing with posterior cervical sclerites. Posterior cervical sclerites forming narrow, elongated plates reaching prothoracic episternum, articulating with weakly sclerotized anteromedian band of prothoracic eusternum by thin, ventral intercervical sclerites. Legs with symmetrical claws; spur formula 2, 4, 3; foreleg spurs about equally large, midleg posterior subapical spurs 1/3rd as long as anterior subapical spur, hind leg posteroapical spur 1/6th as long as other spurs. Forewings: length 13.0 mm, membrane densely covered by long setae; setae on proximal 2/3rds silky, light brown-ochraceous; wide subapical transverse band dark brown, with fringed anterior and posterior margins followed by light brown apical marginal band.

Male genitalia. Abdominal segment IX fused annularly, without longitudinal groove separating dorsal mesal and ventral parts; tergum as long as venter; acrotergite (precostal lip of tergum) less pigmented and granulous, contrasting from stronger sclerotized antecosta and antecostal suture; anterolateral margins of segment IX convex, triangular below midheight; posterior margins straight at gonocoxites, additional lateral flank ventrally of preanal appendages medium sized, rounded subtriangular, glabrous, less pigmented on apical half. Antecosta well developed, short in dorsal view, directed mesad, lateral rims well separate; gap between antecostae filled by acrotergite; antecosta broadest on apex of triangular apodeme in lateral view; broadest on mesal 1/3rd of venter in ventral view. Acrotergites well developed, pale, forming pair of laterally elongating surfaces separate from large part; covered with microthrichia; in dorsal view tergum forming triangular median keel densely packed with microtrichia; spine row absent on posterior margins of segment IX; segment smoothly glabrous by microtrichia, except at smaller dorsopleural setose area behind flank, and larger ventropleural setose area on venter. Intersegmental depression between segment IX and segment X forming steep slope in lateral view, armed with median, finger-like process below triangular apex of median keel. Segment X as long as gonocoxites; longer than preanal appendage, forming broad hood with ventrolaterad directed apices, ending in long spine; in dorsal view segment X quadrangular with laterad curving apices and broad, triangular, mesal excision. Apicoventral setose lobes forming setose surfaces before each apex. Apicodorsal setose lobes forming sparsely setose surfaces above middle of segment X. Dorsal interlobular gap widely V-shaped. Preanal appendages filiform in lateral view; straight rod-shaped in dorsal view. Gonocoxites without harpago; basal body broadly quadrangular in lateral and ventral view, ending in digitate process on apicodorsal corner in lateral view. Phallic apparatus forming slightly curving tube, ending in sclerotized ventral apical lobe hosting endotheca and phallicata. Phallotheca straight in ventral view. Phallotremal sclerite feeble in lateral view as sclerotized triangle structure in membranous phallicata; in ventral view phallotremal sclerite sickle-shaped. Ejaculatory duct slender, clearly visible, nearly reaching phallotremal sclerite.

Holotype male: MADAGASCAR: Fianarantsoa Province, 7 km W Ranomafana , 900 m, 8–13.iii.1990, Malaise trap across stream, montane rain forest [W.E. Steiner] – ( NMNH).

Distribution: Madagascar.

Etymology: Samuh, band in Sanskrit. This species is named after the dark brown wide transverse subapical band on the ochraceous forewing.

Figures

FIGURES 99–104. Anisocentropus samuh, new species, holotype. 99 — right forewing; 100 — genitalia, lateral; 101 — genitalia, dorsal; 102 — genitalia, ventral; 103 — phallus, lateral; 104 — phallus, ventral.