Neotrichia sandersoni 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

Neotrichia sandersoni Harris and Flint , new species

Fig. 8

This species appears to be a member of the vibrans group of Keth et al. (2015) with closest similarity to N. labios Keth in the presence of a sclerotized process from the subgenital plate and the ventral aspect of the inferior appendages. There is also some similarity to N. alyshae Keth and N. halia Denning in the deep apical incision of tergite X. It differs from these species in the complex structure of the phallus with multiple processes, the narrow configuration of the subgenital plate, and the sclerotized lateral processes from segment X.

Male. Length 2.0 – 2.2 mm. 18 antennal segments, body brown in alcohol. Segment VIII annular. Segment IX complete laterally, posteriorly rounded, anteriorly tapering to finger-like process; in ventral view shallowly incised on posterior margin, deeply incised on anterior margin. Tergite X posteriorly deeply incised producing lateral ears, posterolateral processes sclerotized, thin and apically acute; laterally short, dorsum narrowing to acute apex, venter produced into narrow, sclerotized process, which is upturned to acute apex. Subgenital plate in lateral view wide basally, abruptly narrowing distally with elongate seta at apex, heavy sclerotized spine projecting ventrally at midlength; in ventral view wide basally, tapering to bifid apex, ventrally with rectangular, medial sclerite ending with pair of elongate setae, lateral spines projecting mesad near midlength. Bracteoles narrow basally, widening distally to rounded apex. Inferior appendages in lateral view oval, wide basally, gradually tapering to an acute apex; in ventral view elongate, wide basally, curving mesally and tapering to truncate apices, bearing numerous stout setae. Phallus tubular, constricted near mid-length and bearing wide setose paramere, distally with numerous elongate processes, apex divided into pair of thin processes.

Type material. Holotype, male - United States, Arizona, Coconino County, West Fork Oak Creek , A 79-17, 9 August 1979, M. Sanderson ( INHS) . Paratypes - same as holotype, 2 males ( INHS, NMNH).

Etymology. Named for the late Milton W. Sanderson of the Illinois Natural History Survey who collected the new species and also many other interesting western species of microcaddisflies.

Figures

Figure 8. Neotrichia sandersoni, n. sp. Male genitalia. A. Lateral view; B. Ventral view; C. Dorsal view; D. Phallus, dorsal.