Rhyacopsyche holzenthali Harris and Armitage 2019, new species

Rhyacopsyche holzenthali Harris and Armitage, new species

Fig. 22

Diagnosis. Rhyacopsyche holzenthali appears most closely related to R. andina Flint, R. intraspira Wasmund and Holzenthal, R. mexicana (Flint), and R. torulosa Flint in the shape of inferior appendages in lateral view. However, in these species the dorsum of segment IX is deeply divided, which is the new species is entire.

Male. Length 2.7–2.9 mm. 39 antennal segments, tufts of hair between and behind the scapes, brown in alcohol with wings mottled with white hairs. Abdominal segment VIII annular. Segment IX produced dorsally into shelf-like lobe, tapering distally and bearing row of dark, peg-like setae ventrally, truncate lobe mesally; in dorsal view truncate posteriorly with small notch mesally, cluster of dark peg-like setae on margin, anteriorly deeply incised, truncate mesally. Tergum X narrow and shelf-like, retracted within segment IX posteriorly, anteriorly articulating with subgenital plate, which is round distally and ventrally, and bears several stout setae from venter. Inferior appendages narrow basally, dorsal margin expanded at midlength, then abruptly narrowing to finger-like apex which bears an elongate dorsal spine; in dorsal and ventral views, nearly parallel-sided until narrowing apically and curving along the outer margin. Phallus in dorsal view tubular, thin membranous sheath subapically, both central and lateral processes linear.

Female. Unknown.

Type material. Holotype, male— Panama, Bocas del Toro Province, Quebrada Rambala, near Rambala Jungle Lodge, 3.7 km SSE Rambala, 8.91627°N and 82.15469°W, 120 m, Malaise trap, February 6–12, 2017, E. Carlson. Paratypes. ibid., 1 male; ibid., March 31–April 11, 2015, 1 male; ibid., March 28, 2015, 1 male; ibid., tributary of Quebrada Rambala, 134 m, September 29, 2015, 1 male (SCH).

Etymology. We take great pleasure in naming this species for our colleague Ralph Holzenthal, who has contributed much to our knowledge of neotropical caddisflies and, along with Anne Wasmund, recently revised the genus Rhyacopsyche.