Oxyethira pembertonensis Harris and Flint, 2016

Harris, Steven C. & Oliver S. Flint, Jr., 2016, New species of microcaddisflies (Trichoptera: Hydroptilidae) from the western United States, Canada, Mexico and Belize, Insecta Mundi 2016 (499), pp. 1-22 : 5-6

Oxyethira pembertonensis Harris and Flint , new species

Fig. 9 , 10

A member of the subgenus Oxytrichia in the dualis group ( Kelley 1984), the new species is most similar to the nominal species O. dualis Morton in the dorsum of segment IX being reduced to a single band and the phallus apex bearing short spines. It differs in the venter of segment X being asymmetrically divided into elongate, sclerotized processes.

Male. Length 3.3 – 3.8 mm. 38 antennal segments, extending beyond length of body, which is brown in alcohol. Segment VII annular with elongate ventromesal process. Segment VIII somewhat rhomboid in shape, tapering posterodorsally; in ventral view shallowly incised on posterior margin; dorsally with posterior margin deeply incised. Segment IX rectanguloid and enclosed within segment VIII, anterodorsal bridge connecting with segment X, narrowing posteroventrally to rounded apex; ventrally incised on anterior margin, posteriorly produced as a truncate plate. Segment X in lateral view basally divided into series of three thin, elongate processes, which extend beyond the length of the segment, posteriorly lobate and membranous; tergum tapering to rounded, membranous apex, elongate lateral processes from left side of tergum. Subgenital plate strongly arched in lateral view, rounded apically and bearing a short rectangular process dorsally. Phallus tubular, constricted at midlength, apex bearing four spines.

Female. Length 3.0 – 3.8 mm; antennae and color as in male. Segment VI annular with short ventromesal process. Segment VII annular, posterior margin shallowing incised mesally. In lateral view, dorsum segment VIII anteriorly extended as thin apodeme, posteriorly fused with segments IX and X, tapering distally, bearing apical tubercle; venter segment VIII triangular, narrowing to acute apex distally. Segment X dorsally rounded posteriorly, bearing pair of short tubercles. Bursa copulatrix in lateral view thin and membranous; in ventral view cup-shaped, posteroventral corners membranous, spermathecal process key-hole shaped, thin crescent-shaped sclerite posteriorly.

Type material. Holotype, male - Canada, British Columbia, Pemberton, Pemberton Creek N50 18.9’, W122 48.2’, 16 June 2004, C. and O. Flint, Jr. ( NMNH) . Paratypes - same as holotype, 2 males, 50 females ( NMNH).

Etymology. Named for the town and creek in British Columbia where the species was collected.

Figures

Figure 9. Oxyethira pembertonensis, n. sp. Male genitalia. A. Lateral view; B. Ventral view; C. Dorsal view; D. Phallus, lateral, E. Phallus, ventral.

Figure 10. Oxyethira pembertonensis, n. sp. Female genitalia. A. Lateral view; B. Ventral view; C. Dorsal view.