Dipseudopsis rathnotoia, Oláh, János & Johanson, Kjell Arne, 2010

Oláh, János & Johanson, Kjell Arne, 2010, Contributions to the systematics of the genera Dipseudopsis, Hyalopsyche and Pseudoneureclipsis (Trichoptera: Dipseudopsidae), with descriptions of 19 new species from the Oriental Region., Zootaxa 2658, pp. 1-37 : 11-12

Dipseudopsis rathnotoia , new species

Figs 22–27

This species is darker than many other Oriental species in the genus. It is close to D. varians Ulmer, 1929 , from which it is separated by having almost no translucent spots on the forewings (only small, faded, lighter spots are visible); modified hind leg spurs that are each twisted into a short spiral; and inferior appendages that are triangular, not elongate oblong, each exhibiting a sharp basodorsal corner, and lacking the conspicuous central tooth seen in D. varians .

Male. Body generally dark; head dorsum, cervical sclerites, prothorax orange brown, proboscis and abdomen faded white. Antennae, maxillary palps, labial palps, mesonotum, metanotum, legs, abdominal segments VII and VIII, and genitalia dark chestnut brown.

Head. Clypeolabral grooves barely discernible. Occipital and postgenal compact setose warts covered by short, black setae; setae on occipital compact setose warts stiff. Pair of large, setose, mesal longitudinal bands present, probably representing fused vertexal lateroantennal, and vertexal ocellar, diffuse setose warts. Lateral cervical sclerites long, triangular. Central ridge of cervical sclerites covered by diffuse setae.

Thorax. Mesoscutum sparsely covered by small alveoli; divided by shallow median longitudinal furrow; mesoscutellum with 2 bands of alveoli separated by median groove, together forming diamond-shaped surface. Foreleg posteroapical spurs little longer than anteroapical spurs; mid leg posterior spurs longer than anterior spurs; hind leg with modified spur un-branched, slightly longer than adjacent anteroapical spur, large basal half unmodified, small apical half twisted 180° into short spiral ridge with small, mesad-directed apical point; modified apical part excavated, concavity filled with closely set setal bundle with alveoli situated on bottom surface of furrow. Forewing length 12.0 mm. Forewing and hind wing membranes dark chestnut brown, slightly darker along veins; all membrane surfaces densely covered by short, dark, decumbent setae; basal triangular spot present between R1 and Cu1 to first fork on Rs and M; spot of subapical irregular transverse patch located distally to cord almost indiscernible.

Male genitalia. Segment IX with small tergite and large sternite, connected by narrow strip on each side composed of antecostal ridge and fused base of large preanal appendage; tergite triangular in lateral view, rounded in dorsal view, overhanging segment X; 2 lateral setose areas visible in lateral and dorsal view; sternite IX quadrangular in lateral view, with bulging basodorsal corners being complex, articulating with antecostal ridge and preanal appendages; mesosuperior processes arising from phallocrypt and exhibiting complete and complex ring encircling phallobase; composed of short, ventral pair of elongate lateral, and short, weakly sclerotized mesosuperior parts, beneath membranous basoventral part of segment X. Phallobase fixed by short phallic apodeme to phallocrypt complex; basal plate or long rod of apodeme of inferior appendages apparently not attached below phallocrypt complex, moving free. One-quarter of apicodorsal corner of sternite IX densely packed with microtrichia and sharp cuticular denticles, interspersed with long setae. Segment X longer than inferior appendages, originating deeply beneath overhanging tergite IX, forming well-pigmented hood above phallus with weakly discernible setose areas on apex; broad thumb-like in lateral view; blunt sagittate with constricted base and small apicomesal excision in dorsal view. Intersegmental depression between segment IX and segment X forming deep concavity in lateral view beneath overhanging tergite IX. Preanal appendages broadly auriform, each with dorsoapical blunt lobe. Preanal appendages each fused to antecostal ridge of segment IX along wide basal part, hinged dorsally to tergite IX, and ventrally to basodorsal corner of sternite IX. Inferior appendages shorter than segment X; triangular, each with sharp basodorsal corner in lateral view. Phallic apparatus small. Phallotheca forming heavily sclerotized broad basal tube and narrowing ventroapical lobe; basal part with few minute alveoli; delineation of membranous dorsal and apical endotheca and aedeagus obscure, with few small, weakly sclerotized phallotremal sclerites with microtrichia, position varying according to erection state of aedeagus.

Holotype male: MALAYSIA: Perak, Halong stream, ix–x. 1993, at light [G.S. Robinson], ( NHML). Paratypes: MALAYSIA: Perak, Tasek Temengor, Sungei Halong, 230m, MNS Belum, Rothamsted, trap site 1, 2.vii.1994, 3 males (OPC); Perak, Halong stream, ix–x.1993, at light [G.S. Robinson], 18 males ( NHML).

Etymology. Rathnotoia , from Vietnamese word “rathno,” meaning minute, referring to the minute terminal hook on the modified hind leg spur; and from Vietnamese “toi,” meaning dark, referring to the overall dark colour of the body and wings.

Figures

FIGURES 22 – 27. Dipseudopsis rathnotoia, new species, holotype male. 22 — right forewing, dorsal; 23 — left hind leg apical tibial spurs; 24 — genitalia, left lateral; 25 — genitalia, dorsal; 26 — inferior appendage, ventral; 27 — phallus, left lateral.