Cheumatopsyche tiokalamkita Oláh & Johanson, 2008

Oláh, J. & Johanson, K. A., 2008, Generic review of Hydropsychinae, with description of Schmidopsyche, new genus, 3 new genus clusters, 8 new species groups, 4 new species clades, 12 new species clusters and 62 new species from the Oriental and Afrotropical regions (Trichoptera: Hydropsychidae), Zootaxa 1802, pp. 1-248 : 213-216

Cheumatopsyche tiokalamkita Oláh & Johanson , new species

Fig. 358–362

This dark animal bimaculated in white, is very similar to C. ranomafana Oláh & Johanson in the male genitalia, and both species collected in the same Malaise trap. Cheumatopsyche ranomafana has uniformly coloured forewing membranes without the remarkable white patch being characteristic for the new species. Although there are some individuals of C. tiokalamkita with less pronounced white patch, both males and females, C. tiokalamkita are easily distinguished by the presence of this pale patch.

Cheumatopsyche tiokalamkita , new species is separated from C. ranomafana in the female genitalia by the absence of an elongated, ventrocaudal angle of tergite VIII. It is separated from C. ranomafana in the male genitalia by the rounded, more robust apicoventral setose lobes, being more slender in C. ranomafana ; and the apical lobes of segment IX is rounded, while triangular in C. ranomafana . In the over-cleared holotype of C. ranomafana the left apical lobe do not looks triangular, as it was also drawn, but it is triangular on the right side of the holotype and on both sides of all subsequently examined specimens.

Male ( Fig. 358–361). Body and wings dark brown with darker pubescence; legs and antennae with paler pubescence. Maxillary palp formula I-(III, IV)-II-V, segment V as long as sum of segments I–IV. Head dorsum dark chestnut brown, with 7 dark chestnut brown setal warts. Mesolateral warts dividing into mesad orienting row of 3–4 warts gradually decreasing in size. Swollen setal wart absent on proepisternum. Setal wart present on precoxale. Pretarsal claws asymmetrical, laterally flanked by setal bundle. Mid- and hind-leg claws asymmetrical. Spur fomula 244. Protibiae with posteroapical spur slightly smaller than anteroapical spur.

Wings. Forewing evenly brown with slightly darker veins and setae. Large, white, compact, rounded, patch located between first radial forks and M veins at point where discoidal and median cells start, more at basis of median cells. Forewing crossveins m-cu and cu tangential. Sc and R separate before costa. Cu2 and A1 confluent, meeting before wing margin. Hind wing Sc and R meeting after crossvein r. Crossvein r located posteriorly of crossvein s. Fork 1 present. Forewing length 7.1 mm.

Male genitalia. Abdominal segment IX fused annularly, tergum much shorter than sternum ( Fig. 358), reduced to narrow strip constricting at middle in dorsal view ( Fig. 359). Anterior margins of segment IX regularly bow-shaped; dorsally sinuate in lateral view ( Fig. 358). Apical lobe on posterolateral margins right angled, rounded; situated above less sclerotized articulation cavity of gonocoxites. Spine row on posterior margins of segment IX almost continuous, heterogeneous. Spines on dorsolateral spiny lobes longer than spines on apical lobes; dorsolateral spiny lobes reduced in dorsal view ( Fig. 359), present on posterior slope of tergum IX and ventrad into intersegmental depression ( Fig. 358). Intersegmental step between segments IX and X sloping. Segment X elongate, with rounded, with slightly dorsad orienting apex ( Fig. 358); dorsum strongly concave in lateral view; nearly quadrangular in dorsal view ( Fig. 359); slightly broadening and rounded at middle; apicoventral setal lobes wide; forming bilobed segment X in dorsal view ( Fig. 359); with narrow and deep dorsal interlobular gap. Sutures broad; transverse sutures crossing segment X obliquely; longitudinal sutures starting from apicoventral setose lobes; fusing with transverse sutures into Y. Smooth mesocaudal plate with reduced central part filling basal half of interlobular gap in dorsal view ( Fig. 359). Apicoventral setose lobes modified into large, laterally broad, posterodorsad orienting, rounded lobes being setose on apex and basis ( Fig. 358). Lateral setose areas (superior or preanal appendages) forming vertical, elongated, elevated setal warts centrally on segment X; reaching slightly above dorsum in lateral view ( Fig. 358); surrounded basally by longitudinal sutures, and anteriorly by transverse sutures. Coxopodites slightly exceeding apex of segment X, forming straight rod dilating gradually apicad ( Fig. 358); weakly curving mesad in ventral view ( Fig. 360). Harpagones broad, nearly parallel-sided in lateral view ( Fig. 358); in ventral view ( Fig. 360) apically tapering from after mid-length, slightly concave mesally. Phallotheca ( Fig. 361) welldeveloped, broad, ventrad curving; dorsally concave. Endophallus forming long, narrow tube, running through entire phallotheca, ending in sclerotized ring at gonopore; ventral enlarged part difficult to discern. Chitinized endothecal process circular, located apicodorsally on apex. Phallotremal sclerites large, broad, rounded in lateral view. Vestigial, membranous, ventral endothecal lobes situated together with more sclerotized ventromesal lobe.

Female. Body and wings dark brown with darker pubescence; legs and antennae with paler pubescence. Maxillary palp formula I-(III, IV)-II-V, segment V as long as sum of segments I–IV. Head dorsum dark chestnut brown, with 7 dark chestnut brown setal warts. Mesolateral warts forming mesad orienting row of 3–4 warts gradually decreasing in size. Swollen setal wart absent on proepisternum. Setal wart present on precoxale. Pretarsal claws symmetrical, not laterally flanked by setal bundle. Claws on mid- and hind legs symmetrical. Spur fomula 244. Protibiae with posteroapical spur slightly smaller than anteroapical spur. Spotreticulated circular plaque present on both sides of membranous pleura of abdominal segment IV.

Wings. Forewing membrane ground color evenly brown, with slightly darker veins and setae; large, white compact, rounded patch located between first forks of R and M where Dc and median cells starting, slightly more on basis of median cells. Forewing crossveins m-cu and cu on line. Sc and R running separately before costa. Cu2 and A1 meeting before wing margin. Hind wing Sc and R meeting after crossvein r. Crossvein r located posteriorly of crossvein s. Fork 1 present. Forewing length 7.6 mm.

Female genitalia ( Fig. 362). Anteroventral corners remaining covered by sternum VIII. Abdomen tapering slightly more in lateral than in dorsal and ventral views, sagittally narrowing posterad. Tergum VIII quadrangular, narrowing slightly apicad; with small ventrocaudal lobes or triangular corners in lateral view. Lobes with wide, shallowly sinuate, mesal dorsocaudal incision visible in dorsal view. Tergal surface smooth, produced, provided by tiny, closely set microtrichiae; setae absent, except on ventrocaudal corners being covered by mesad curving setae. Tergite VIII producing into long, slender anterolateral apodemes. Pleurosternum ( sensu Denning 1943 ), or posterolateral apodeme ( sensu Schefter & Ward 2002 ) narrow, more strongly sclerotized anterior and posteriorly than at centre; parallel-sided; fusing to dorsal margin of sternum VIII; separated by well-developed sutures; setose posteriorly. Sternum VIII rounded, nearly quadrangular; freely flanking ventrocaudal lobe-like corners, ventral plate ( sensu Nielsen 1980 ) or lateral plate ( sensu Denning 1943 ) formed by deep, wide, mesal V-shaped incision. Lobe-like corners, together with distal margin densely covered by long setae flanking fusing membranous sternal part of segment IX. Internal surfaces densely packed with minute hooks; heavily setose ventrocaudal lobes forming second support of copulation chelum of segment VIII. Long setae densely packed on ventrocaudal lobes; posterior half of sternum VIII covered by short setae; basal part devoid of setae. Tergum IX vertically elongate in lateral view; orienting obliquely to main axis of abdomen; narrowing ventrad together with lateral lobe on ventrodistal corners of segment. Narrow antecosta present on anterior margins, with acrotergite on dorsum. Dorsal margin rounded. Posterodorsal margin of segment IX with small rim-like lobe on both sides; with 3 long, stiff setae. Sclerotized ridge running along central part of tergum IX from apicodorsal corners and from small clasper receptacles, ventrad to onethird of segment; delineating shallow, flat, depressed, distal cavity of clasper grooves. Clasper grooves forming small clasper areas being depressions on apicodorsal corners of tergum IX; delineated anteriorly by ridge with 3 setae on anterior margins; delineated ventrally by elevated lateral lobes; delineated dorsally by dorsal rim housing clasper receptacles. Elevating ventral part producing into small triangular, lateral lobe ( sensu Denning 1943 ) or tongue-like lamellae ( sensu Nielsen 1980 ); with 2–3 long apical setae. Clasper receptacles reduced into small, sinuous, cavities. Distinctly marked suture delineating less pigmented, short tergum X along distal margin of tergite IX. Tergum X representing body of upper lip of atrium ( sensu Nielsen 1980 ) composed of pair of foliate, principal, flat lobes covered by short setae nested in large wart-like alveoli; and tridactylate short lobes; dorsal lobe being largest; middle process (cercus sensu Nielsen 1980 ) digitate, slen- der, armed with 2 apical setae. Dorsal and ventral processes blunt, with tiny, peg-like setae on dome-like alveolar membranes in deep alveoli, visible at high magnification. Sclerotized, setose, foliate, small, flat, lobe concealed under foliate, principal setose lobes of tergite X; possibly representing rudimentary sternal lobes, or the lateral tergal plate ( sensu Denning 1943 ). Lobes connected by smooth, membranous, triangular, median body surrounding anovaginal dorsal parts of opening; connecting basally to lower lip. Lower lip of atrium ( sensu Nielsen 1980 ), or vulvar scale ( sensu Schmid 1998 ), representing sternal portions of segment IX, visible mostly as distended bag-like structure; mostly covered by sternum VIII. Vaginal apparatus in mostly membranous, slightly sclerotized, sinuate, thin, trip connecting lower lip with sclerotized tergum of segment IX, as well as pair of slightly sclerotized plates on dorsum of lower lip.

Holotype male: MADAGASCAR: Fianarantsoa Province, 7 km W Ranomafana , 1000 m, Malaise trap in small clearing, mountain rainforest, 26–29.iii.1990 [W.E. Steiner] - ( NMNH).

Paratypes: MADAGASCAR: same data as holotype - 1 male, 5 females ( NMNH); 1 male, 1 female ( OPC) .

Distribution. Madagascar.

Etymology. tiokalamkita , from “tio”, meaning bi; and “kalamkita”, meaning maculated in Sanskrit, named after the remarkable, single white spot in the forewing centre, giving it an elegant, bimaculate feature.

Remarks. Segments IX and X slightly extruded with pincers from partial coverage of segment VIII for proper illustration.