Trisaria rex Shear 2020, new species
Creators: name: Shear, William A.
Publisher: name: Zenodo
Year: 2020
Subjects: Biodiversity
Taxonomy
Animalia
Arthropoda
Diplopoda
Chordeumatida
Striariidae
Trisaria
Trisaria rex

description: Trisaria rex, new species
Figs. 15–28
Types: Male holotype and 3 female paratypes from. I-90 exit #37, 1300’ asl, N47°26.613’, W121°40.061’, 21 January 2005, W. Leonard, King Co., Washington, 25 February 2004, W. Leonard, C. Richart, deposited in Burke Memorial Museum, University of Washington, Seattle, Washington.
Etymology: The species epithet (Latin, “king”) refers to King County, Washington, to which the species seems endemic.
Diagnosis: Distinct in the form of the gonopods and ninth legs. The posterior branch of the median angiocoxite is very long (mac2, Figs. 22, 27), while it is short in both T. olympia and T. washingtonensis. In contrast to the robust form of the ninth leg telopodite in the other two species, that of T. rex is strongly compressed (t9, Figs. 20, 23, 28).
Description: Male from Twin Falls/Iron Horse trailhead. Length, 8.0 mm, width, 0.82 mm. Body form and secondary sexual modifications as described for genus. Gonopods (Figs.20–22, 26, 27) robust, sternum (gst, Figs. 20, 21) broad, well-sclerotized. Median angiocoxite (mac, Fig. 20) with two branches: the anteriormost (mac1, Figs. 21, 26) short, blunt; the posterior most (mac2, Figs. 22, 26, 27) long, bent posteriorly at nearly a right angle, then dorsally at a slightly more obtuse angle. Lateral angiocoxite (lac, Fig. 20) with three branches: the anteriormost (lac1, Figs. 21, 26, 27) long, slightly curved, divided at tip into two processes, each of these further divided into three or four smaller, acute terminations, one set pointing anterior, the other posterior. Median branch (lac2, Figs. 21, 22, 26, 27) set with dense array of fine spines, giving comb-like appearance. Posteriormost branch (lac3, Figs. 22, 27) short, simple, bluntly acuminate. Colpocoxites (cc, Figs. 22, 26, 27) entirely membranous, with scaly cuticle. Ninth legs (Figs. 23) much reduced, sternum (st9, Figs. 23), coxae (c9), telopodites (t9) almost completely fused, telopodites much flattened, distally setose; coxae with minute anterior pore (cp, Fig. 23). Tenth legs (Fig. 24) with enlarged coxae (c10, Fig. 24) bearing glands (gp, Fig. 24).
Female from Twin Falls/Iron Horse trailhead. Length, 9.2 mm, width 0.90 mm. Nonsexual characters as in male.
Distribution: WASHINGTON: King Co.: North of I90, Pratt Lake Trailhead, N47°23.829, W121°29.109, 25 October 2003, W. Leonard, m, f. Same, but N47°23.821’, W121°29.108’, 1700’ asl, 15 October 2009, mm. I-90 at Snoqualmie River, Twin Falls/Iron Horse Trailhead, N47°26.651’, W121°40.081’, 25 February 2004, W. Leonard, C. Richart, m, f; Tokul Creek, 520’ asl, 47.556°N, 121.817°W, 21 November 1979, R. Crawford, m.
Notes: Presently this species is known only from central and western King County, Washington.
description: Published as part of Shear, William A., 2020, The millipede family Striariidae Bollman, 1893: I. Introduction to the family, synonymy of Vaferaria Causey with Amplaria Chamberlin, the new subfamily Trisariinae, the new genus Trisaria, and three new species (Diplopoda, Chordeumatida, Striarioidea), pp. 275-295 in Zootaxa 4758 (2) on page 284, DOI: 10.11646/zootaxa.4758.2.4, http://zenodo.org/record/3734456