Trisaria rex, Shear, 2020

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), Zootaxa 4758 (2), pp. 275-295 : 284

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.

Figures

FIGURES 15–19. Trisaria rex. Fig. 15. Gnathochilarium of male, ventral view; isp, inner stipital palp, ll, laminae linguales, lp, lingual palp, m, promentum, osp, outer stipital palp, stg, stipes of gnathochilarium. Fig. 16. Terminal structures, ventral view; epi, epiproct, hypo, hypoproct, para, paraproct. Fig. 17. Specialized setae of legpair 1. Fig. 18. Legpair 3, anterior view; cx3, coxa, pf3, prefemur 3, s3, sternum 3. Fig. 19. Tip of coxal flask of left legpair 3, anterior view.

FIGURES 20–25. Trisaria rex. Fig. 20. Gonopod complex, ventral view; art7, articulating surface of paratergite 7, cx 10, cx11, coxae of legs 10 & 11, gst, gonopod sternum, mac, median colpocoxite, lac, lateral colpocoxite, t9, telopodite of 9th leg. Fig. 21. Gonopods, anterior view; gst, gonopod sternum, lac1, lac2, first and second branches of lateral colpocoxite, mac1, mac 2, first and second branches of median colpocoxite. Fig. 22. Gonopods, posterior view; cc, colpocoxite, lac 3, third branch of lateral colpocoxite; other labels as in Fig. 21. Fig. 23. Legpair 9 of male; labels as in Fig. 13. Fig. 24. Legpair 10 of male; cx10, coxa, gp, coxal pore. Fig. 25. Part of prefemur of leg 10, showing modified setae.

FIGURES 26–31. Trisaria rex and Trisaria washingtonensis. Figs. 26–28. Trisaria rex. Fig 26. Anterior gonopods, anterior view; labels as in Figs. 21 and 22. Fig. 27. Gonopods, posterior view; labels as in Figs. 21 and 22. Fig. 28. Left leg 9 of male, anterior view; ap, apodeme; other labels as in Fig. 8. Figs. 29–31. Trisaria washingtonensis. Fig. 29. Left leg 9 of male, anterior view; sp, spiracle; other labels as in Fig. 8. Fig. 30. Gonopods, anterior view; gst, gonopod sternum; other labels as in Figs. 21 & 22. Fig. 31. Gonopods, posterior view; labels as in Fig. 27.