Anisocentropus (Anisomontropus) thonmihn, 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 : 65-66

Anisocentropus (Anisomontropus) thonmihn , new species

Figs 133–137

This species is large, greyish brown, with light patterned forewing membrane. The genitalia resemble those of A. bungus . Anisocentropus thonmihn , new species is separated from A. bungus in the genitalia by the more slender preanal appendages in dorsal view; and possessing triangular apical lobes on the posterior margins of segment IX. Another distinguishing character is the large maculae along each forewing crossveins and fork bases, and the presence of 2 irregular patches on the anterior margin of the forewings. The forewings of Anisocentropus bungus have no membrane pattern.

Male (in alcohol). Body large, brown; forewings with large, light maculae and patches. Head rectangular in dorsal and facial view, almost as long as broad. Ocelli absent. Tentorium is visible. Facial groove patterns with plate-like flange, or rim, connecting anterior tentorial pits. Theoretical line separating frons and clypeus forming oblique, dorsad 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). Small subantennal grooves sinuous, running almost horizontally between large frontogenal compact 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 elevation dominating 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 vertically long, subquadrangular, with rounded apex, freely hanging, sparsely setose. Mandibles long, turning mesad, weakly pigmented, located laterad along labrum. Lacinia broad elongate, bearing few setae. Frontal setal warts absent; frontal interantennal warts absent due to anterad directing elevation of vertex. 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 large. Pair of small, rounded vertexal ocellar compact setose warts, as well as equally large, or slightly larger pair of vertexal medioocellar compact setose warts visible centrally on vertex. Pair of large, obliquely located, ovoid occipital compact setose warts dominating on posterior half of vertex. Pair of small, postgenal compact warts visible between posterior section of ocular grooves and large occipital compact setose warts. Maxillary palps filiform, covered by long setae; maxillary palp formula VI-IV-(II,V)-I-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, ovoid, transversely elongated warts mesally widely separated by deep cleft; pair of small, rounded warts located deep laterally, visible in lateral view. Pair of mesoscutal warts almost indiscernible, arranged in pair of longitudinal lines running along mesoscutum. Pair of mesoscutellar warts forming round, weakly pigmented areas with 5 to 6 setal alveoli. Large, rounded setose warts located proximally, above articulation of cervical sclerite on proepisternum, larger than setal wart on precoxale. Large, compact setal warts present mainly on membranous part of cervix, touching anterior arm of cervical sclerites. Lateral cervical sclerites, forming narrow anterior arm articulating anteriorly to back of head with occipital condyle, above posterior tentorial pits; fused 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, 2; each foreleg with posteroapical spur 2 times longer than anteroapical spur; midleg anteroapical and anterosubapical spurs 1/4th as long as other spurs; hind leg apical spurs equally long. Forewings: length 12.0 mm; membrane brown, without pattern; Sc hypertrophied with crossvein sc-r, forming thick, strengthened longitudinal vein; R1 confluent with, or recurrent into, R2 well before C; vestigial crossvein r visible at confluence of R1 and R2; base of discoidal cell located proximally of mid-length of wing; forks I, II, III, IV, V present; crossveins h, sc-r, r, s, r-m, m, m-cu, cu1 and cu2 present; crossvein cu-a absent; postanal vein absent. Hind wings: R1 meeting R2; forks I, II, III, V present; fork I longer than fork II.

Male genitalia. Abdominal segment IX fused annularly, without longitudinal groove separating dorsal, mesal and ventral parts; tergum shorter than venter; anterior margin of segment IX convex towards venter in lateral view, more developed ventrally; apical lobes triangular. Antecostae weakly developed, forming narrow, marginal rim, almost equally thin along margins, without conspicuous external groove of antecostal sutures; tergum IX with narrow triangular mesal keel in dorsal view, forming continuation of sharp dorsal keel of segment X, characterised by lateroapical rounded projections, overhanging partially base of preanal appendages; tergite with less pigmented band in dorsal view; acrotergite visible on anterior margin; spine row on posterolateral margin forming setal patches of almost equal size behind apical lobes, below ventropleural region. Intersegmental depression between segment IX and segment X filled. Segment X slightly shorter than gonocoxites, forming broad hood with straight-cut apex; sclerotized band running from apex to base of gonocoxites on lower ventral sub margin less developed. Apicoventral setose lobes forming setose surfaces before and at apex. Apicodorsal setose lobes with few tiny setae above middle of segment X. Dorsal interlobular gap narrow, deeply triangular. Preanal appendages much longer than segment X; almost parallel-sided, arching on apical 1/3rd in lateral view, slender in dorsal view, with well developed constriction at middle, with clavate apices. Gonocoxites without harpago, slender, sinuous, with mesal broadening in ventral view; forming regular arch in lateral view. Phallic apparatus straight; with elongated, sclerotized apicoventral lobe; endotheca and phallicata membranous above apicoventral lobe. Phallotremal sclerites U-shaped in ventral view, with tapering apices. Ejaculatory duct sinuous in lateral view.

Holotype male: VIETNAM: Quang Tri Province, Huong Hoa District, Huong Hoa Nature Reserve, near Cup Village , 400m, loc. No. 92, centered at 16 o 56 ’ 15N 106 o 34 ’ 52E, 7–10.xi.2007, light [G. Csorba] — ( OPC).

Distribution: Vietnam.

Etymology: thonmihn , after “thon mihn”, slender in Vietnamese, named after the slender preanal appendages.

Remarks: The Anisocentropus latifasciata diagnostic species-group has a Gondwanan distribution, including Sri Lanka and India. The following 43 species belong to this group, all with unique forewing patterns ( Fig. 138–159 ): A. banghaasi Ulmer, 1909 , A. bellus Banks, 1931 , A. bicoloratus (Martynov, 1914) , A. bipustulatus Botosaneanu & DeVos, 2004 , A. brevipennis ( Ulmer, 1906) , A. corvinus Neboiss, 1980 , A. cretosus McLachlan, 1875 , A. croesus McLachlan, 1875 , A. dilucidus Botosaneanu & DeVos, 2004 , A. eungellus Neboiss, 1980 , A. fijianus Banks, 1936 , A. fridae , new species, A. fulgidus Navás, 1933 , A. furcatus ( Banks, 1924) , A. gilvimacula Botosaneanu & DeVos, 2004 , A. hannahae , new species, A. hoisat , new species, A. hyboma Neboiss, 1986 , A. illustris McLachlan, 1863 , A. immunis McLachlan, 1863 , A. io Kimmins, 1962, A. kirramus Neboiss, 1980 , A. krampus Malicky, 1994 , A. latifascia (Walker, 1852) , A. maclachlani Ulmer, 1929 , A. magnificus Ulmer, 1906 , A. maralus , new species, A. mjoebergi , new species, A. muricatus Neboiss, 1980 , A. nitidus Banks, 1937 , A. pictilis Neboiss, 1986 , A. piepersi McLachlan, 1875 , A. semiflavus Banks, 1939 , A. sierramadrensis Mey, 2003 , A. solomonis Banks, 1939 , A. tapenan , new species, A. thinlin , new species, A. torulus Neboiss, 1980 , A. triangulatus Ulmer, 1907 , A. tristis Ulmer, 1929 , A. valgus Neboiss, 1980 , A. vanuensis , new species, and A. vitiensis , new species.

There are 3 species of this diagnostic species-group recorded from outside Gondwana: A. erichthonios Malicky & Cheunbarn in Malicky et al. 2001 ( Thailand), A. golem Malicky, 1994 ( Brunei) , and A. malaisei , new species ( Myanmar).

It seems that all the species described from the Afrotropical Region belong to this group as well. However, the genitalia of most of these species are poorly described. The Afrotropical species are: A. brunneus Jacquemart, 1966 , A. fischeri Marlier, 1971 , A. usambarensis Ulmer, 1908 , A. fulvus Navás, 1934 , A. samuh , new species, and A. voeltzkowi Ulmer, 1909 .

Figures

FIGURES 133–137. Anisocentropus thonmihn, new species, holotype. 133 — right forewing; 134 — genitalia, lateral; 135 — genitalia, dorsal; 136 — gonocoxite, ventral; 137 — phallus, lateral.

FIGURES 138–147. Anisocentropus species, right forewings, non-types. 138 — A. banghaasi Ulmer; 139 — A. bellus Banks; 140 — A. bicoloratus (Martynov); 141 — A. bipustulatus Botosaneanu & DeVos; 142 — A. dilucidus Botosaneanu & DeVos; 143 — A. eungellus Neboiss; 144 — A. fulgidus Navás; 145 — A. illustris McLachlan; 146 — A. io Kimmins; 147 — A. kirramus Malicky.

FIGURES 148–157. Anisocentropus species, right forewings, non-types. 148 — A. krampus Maicky; 149 — A. latifascia (Walker); 150 — A. machlachlani Ulmer; 151 — A. muricatus Neboiss; 152 — A. pictilis Neboiss; 153 — A. piepersi McLachlan; 154 — A. semiflavus Banks; 155 — A. solomonis Banks; 156 — A. torulus Neboiss; 157 — A. triangulatus Ulmer.

FIGURES 158–159. Anisocentropus species, right forewings, non-types. 158 — A. tristis Ulmer; 159 — A. valgus Neboiss.