Anisocentropus (Anisocentropus) hoisat, 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 : 45-49

Anisocentropus (Anisocentropus) hoisat , new species

Figs 89–94

This species is medium-sized, brown, with light brown forewings. It belongs to the Anisocentropus brevipennis diagnostic species-cluster of the Anisocentropus latifascia diagnostic species-group characterized by having shortened gonocoxites. It’s genitalia are unique in having a digitate process at the apicodorsal corner of the gonocoxites. The lateral flank between the preanal and gonocoxites is small. It is close to A. brevipennis , but segment X is not excised apicomesally, and the preanal appendages are not sigmoid; instead they are long and filiform in lateral view, and clearly clavate in dorsal view.

Male (in alcohol). Eyes small, body medium-sized, light brown. Head rectangular in dorsal view, almost as long as broad. Ocelli absent. Tentorium slender, without dorsal arm; posterior arms short, robust, ending in pair of large posterior tentorial pits; strong tentorial bridge without anteromesal or posteromesal protuberance; anterior tentorial arm posteriorly robust, anteriorly slender, without median lamellate process; broad posterior half ending in median keel in dorsal view, and in ventral corner in lateral view. Facial groove pattern modified by presence of 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, dorsad continuation from anterior tentorial pits, merging almost horizontally with broad antennal grooves. Clypeogenal vertical grooves located ventrally of anterior tentorial pits, short, running slightly mesoventrad. Plate-like flanges, frontogenal, and clypeogenal sutures form complex of anterior tentorial arms (frontogenal septum). 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. Stem of epicranial groove (coronal groove) vestigial. Antennal and ocular grooves accompanied by occipito-postgenal grooves, partly merged anterad; tangential to large occipital compact setal warts. Labrum heart-shaped, distal half narrow, freely hanging. Mandibles long, weakly pigmented, orienting laterad along each labrum; laciniae narrow, elongate, bearing few setae. Frontal setal warts absent on face. Pair of large, nearly triangular frontogenal compact setal warts present on posterior pregenae, obliquely or almost horizontally from frontogenal grooves, representing only visible setal warts on face. Triangular elevation on vertex with fused vertexal medioantennal compact setose warts located anteriorly on head. Vertexal lateroantennal compact setal warts absent. Antennal sockets large. Pair of small, rounded vertexal ocellar compact setose warts and pair of minute vertexal medioocellar diffuse setose warts present, each with 1 or 2 setae in middle of vertex. Obliquely located pair of large, ovoid occipital compact setose warts dominating 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-VI-IV-I-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, almost tangential 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 mostly of single, double and maximum triple setae in groups visible as weakly pigmented alveoli. Pair of mesoscutellar warts form small, less pigmented, rounded area, each with 5 to 6 setal alveoli. Each proepisternum with minute, rounded setose wart located proximally above articulation of each cervical sclerite. 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 posteroapical spur half as long as anteroapical spurs; midleg anteroapical spurs 1/5th as long as posteroapical spur. Forewings: length 8.0 mm, membrane brown with inconspicuous, lighter band before apex; minute dots present on membrane; sparsely scattered, tiny, light dots more dense around median cell; R1 apparently running free along its length, however hypertrophied crossvein r dominates and terminal section of R1 atrophied, almost vestigial; base of discoidal cell located near midpoint of wing; forks I, II, III, IV, V present; crossveins h, sc-r, r, s, r-m, m, m-cu and cu2 present; crossveins cu1 and cu-a absent; postanal vein absent. Hind wings: R1 meeting R2; forks I, II, III, V present; fork I and fork II nearly equally large.

Male genitalia. Abdominal segment IX fused annularly, without longitudinal groove separating dorsal mesal and ventral parts; tergum shorter than venter; acrotergite (precostal lip of tergum) less pigmented, granulous, significantly contrasting in colour from heavily sclerotized antecosta and antecostal suture. Anterior margin of segment IX convex, sub-triangular, more developed in ventral half; posterior margin slightly concave; short, dorsad curving groove and ridge running obliquely from bottom or middle of concavity, visible in lateral view; additional lateral flank below preanal appendages small, glabrous, less pigmented. Antecosta well developed, directed mesad in dorsal view; curving slightly apicad; 2 lateral rims not tangential; gap between rims filled by acrotergite; antecosta broader ventrally than dorsally in lateral view. Spine row absent on posterior margins of segment IX; segment smoothly glabrous, except with large setose area on venter. Intersegmental depression between segment IX and segment X filled, forming straight horizontal line in lateral view. Segment X as long as gonocoxites and preanal appendages, forming broad hood with ventrolaterad directed apices; segment X quadrangular in dorsal view; mesal excision absent, wide, U-shaped excising on apical margin visible in caudal view. Apicoventral setose lobes reduced to setose surfaces before apex. Apicodorsal setose lobes with few tiny setae above middle of segment X. Dorsal interlobular gap wide U-shaped. Preanal appendages long, filiform in lateral view, straight clavate in dorsal view. Gonocoxites without harpago; basal half broad, with digitate process on apicodorsal corner; dorsal margin convex in lateral view. Phallic apparatus forming regularly curving tube; dorsal margin slightly convex; ventral margin concave; ventroapically elongate, sclerotized, with endotheca and phallicata. Phallotheca forming straight tube in ventral view; slightly broadening apically. Phallotremal sclerite feeble visible in lateral view; forming sclerotized complex accompanied by spines in membranous phallicata. Phallotremal sclerite complex; in ventral view forming Y-shaped structure. Ejaculatory duct slender, reaching phallotremal sclerite complex.

Holotype male: LAOS PDR: Luang Phrabang Prov. : Nam Sat stream, 150 m upstr. Hoi Sat Village, 344 m, UTM 48Q0220680, 2260258, 28.iv–2.v.2005, Malaise trap, loc 17 [N. Jönsson, T. Malm & B. Viklund] – ( NRM).

Paratypes: same data as holotype – 3 females allotypes ( NRM) .

Distribution: Laos.

Etymology: Hoisat, named after the village Hoi Sat, situated 150 meters downstream the type locality.

Anisocentropus (Anisocentropus) maralus , new species

Figs 95–98

This species is medium sized and light brown. It is morphologically close to A. brevipennis in having apicomesally excised segment X. The preanal appendages are not sigmoid but clavate in lateral and dorsal views as in A. brevipennis , and the dorsum of both gonocoxites is almost straight, not bulbous.

Male (in alcohol). Eyes small, body medium-sized, light brown. Head rectangular in dorsal view, almost as long as broad. Ocelli absent. Tentorium slender, without dorsal arm; posterior arms short, robust, ending in pair of large posterior tentorial pits; strong tentorial bridge without anteromesal or posteromesal protuberance; anterior tentorial arms posteriorly robust, anteriorly slender, without median lamellate process; posterior half broad, ending in median keel in dorsal view and in ventral corner in lateral view. Facial groove pattern modified by 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; pattern of plate-like flanges, frontogenal and clypeogenal sutures forming anterior tentorial arm complex (frontogenal septum). 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, directed obliquely or almost horizontally from frontogenal grooves, representing only visible setal warts on face. Triangular elevation on vertex with fused vertexal medioantennal compact setose warts located anteriorly on head. Vertexal lateroantennal compact setal warts absent. Antennal sockets enlarged. Pair of small, rounded vertexal ocellar compact setose warts and pair of minute vertexal medioocellar diffuse setose warts present, each with 1 or 2 setae in middle of vertex. Pair of large, 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-VI-IV-V-I-III (II-I-IV-VI-V-III in a male paratype). 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, almost tangential mesally; pair of small, rounded warts located deep laterally, visible in lateral view. Mesoscutum with 1 pair diffuse warts arranged in longitudinal line along entire mesoscutum, composed mostly 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 each cervical sclerite. 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 present 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 posteroapical spur and hind leg anteroapical spur about half as long as other spurs, midleg anteroapical spur 1/5th as long as posteroapical spur. Forewings: length 8.0 mm, membrane brown with inconspicuous, light subapical band and minute dots scattered on membrane, mostly around median cell; R1 running separate along its length, but crossvein r apicad shifted and more developed than terminal part of R1; base of discoidal cell located around middle of wing; forks I, II, III, IV, V present; crossveins h, sc-r, r, s, r-m, m, m-cu, cu2 and cu-a present, crossvein cu1 absent; postanal vein absent. Hind wings: R1 meeting R2; forks I, II, III, V present, fork I and fork II equal.

Male genitalia. Abdominal segment IX fused annularly, without longitudinal groove separating dorsal mesal and ventral parts; tergum half as long as venter; acrotergite (precostal lip of tergum) less pigmented and granulous, contrasting in colour from heavily sclerotized antecosta and antecostal suture; anterolateral margins of segment IX convex, triangular below midheight; posterior margin straight at gonocoxites; groove and ridge running obliquely from small excision ventrally of additional lateral flank in lateral view; additional lateral flank below preanal appendages medium sized, triangular, glabrous, less pigmented. Antecosta well developed, directing mesad before curving apicad; lateral rims separate; gap between rims filled by acrotergite; antecosta broader at anterior apex of triangular lobe in lateral view. Spine row absent on posterior margins of segment IX; segment smoothly glabrous, except presence of small dorsopleural setose areas at flank, and large ventropleural setose area on venter. Intersegmental depression between segment IX and segment X sloping gently in lateral view. Segment X as long as gonocoxites and preanal appendages, forming broad hood with ventrad and laterad directed double dentate apices; segment X quadrangular with triangular mesal excision visible in dorsal view, with triangular mesal excision. Apicoventral setose lobes reduced into setose surfaces before apex. Apicodorsal setose lobes with few tiny setae located above midheight of segment X. Dorsal interlobular gap widely V-shaped. Preanal appendages long, filiform in lateral view, straight clavate in dorsal view. Gonocoxites without harpago; basal half broad, with digitate process on apicodorsal corner; dorsum straight in lateral view. Phallic apparatus, apically forming straight, regular tube, curving ventrad at basal 1/ 3rd, ending in sclerotized ventral apical trough hosting endotheca and phallicata. Phallotheca forming straight tube in ventral view. Phallotremal sclerite feeble in lateral view, forming complex of sclerotized structure accompanied by spines in membranous phallicata. Phallotremal sclerite complex in ventral view, nearly Yshaped. Ejaculatory duct thin, reaching phallotremal sclerite complex.

Holotype male: MALAYSIA: Perak, Halong stream, ix–x.1993, light [G. S. Robinson] – ( NHML).

Paratypes: same data as holotype – 3 males (2 males in NHML, 1 male in OPC); West-Malaysia, Belum Expedition, Lichtfang Falle 1, 27.xii.1993 [M. Erle] – 1 male ( NHML) .

Distribution: Malaysia (Perak).

Etymology: Maralus, from Sanskrit “marala”, meaning straight, referring to the straight dorsum of the gonocoxites.

Figures

FIGURES 89–94. Anisocentropus hoisat, new species, holotype. 89 — right forewing; 90 — genitalia, lateral; 91 — genitalia, dorsal; 92 — gonocoxite, ventral; 93 — phallus, lateral; 94 — phallus, ventral.

FIGURES 95–98. Anisocentropus maralus, new species, holotype. 95 — genitalia, lateral; 96 — genitalia, dorsal; 97 — gonocoxite, ventral; 98 — phallus, lateral.