Triasaria washingtonensis, 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 : 284-288

Triasaria washingtonensis , new species

Figs. 29–47

Types: Male holotype, 2 male and 7 female paratypes from Swede Park, residence at 369 Loop Road, Grays River, 50’ asl, N46°18.499’, W123°40.128’, Whahiakum Co., Washington, collected 17 January 2004 by W. Leonard, C. Richart and R. Pyle, deposited in Burke Memorial Museum, University of Washington , Seattle, Washington.

Etymology: The species epithet refers to the relatively wide occurrence of the species in southwestern Washington.

Diagnosis: Distinct from the other two species of Trisaria in details of the gonopods ( Figs. 30–35 ). The anterior branch of the median angiocoxite (mac1, Figs. 30 , 32 ) is short, blunt, and two-lobed. The posterior branch a sinuous lamella (mac2, Figs. 30 , 32–35 ); in T. rex , the posterior branch is very long and curved, and in T. olympia it is so small as to be difficult to see.

Description: Male paratype. Length, 8.0 mm, width, 0.75 mm. Nonsexual characters ( Figs. 42 , 43 ) and secondary sexual modifications ( Figs. 37 –39, 40, 41, 44) as described for the genus. Gonopods ( Figs. 30–35 ) robust; gonopod sternum (gst, Fig. 32 ) broad, well-sclerotized. Median angiocoxite with anteriormost branch (mac1, Figs. 30 , 32, 34, 35 ) short, bluntly two-lobed; posteriormost branch (mac2, Figs. 31,35) projecting strongly posteriad as complex, undulate lamella. Lateral angiocoxite three-branched, anteriormost branch (lac1, Figs. 30 , 32–35 ) broad, blunt, with complex tip; median branch (lac2, Figs. 31 , 33–35 ) relatively small, with comb-like array of spines; posteriormost branch (lac3, Figs. 33, 34 ) broadly based, rapidly tapering distally to blunt spine. Colpocoxites (cc, Fig. 33 ) relatively large (but collapsed in Fig. 31 ), with small, triangular cuticular scales. Ninth legpair ( Fig. 31 ) robust, showing less fusion of sternum (s9, Fig. 31 coxa (c9) and telopodite (t9) than in other species, telopodite relatively robust, in situ partially concealing gonopods ( Fig. 41 ). Tenth legpair with enlarged, glandular coxae.

Female paratype. Length, 8.5 mm, width 0.82 mm. Nonsexual characters as in male. Vulvae as in Fig. 37 .

Distribution: WASHINGTON: Whahiakum Co., Elochamin River, 9.6 mi N of SR4, 480’ asl, N46°17.378’, W123°15.891’, 21 March 2004, W. Leonard, C. Richart, m, ff, juvs. Altuna-Pillar Rock Road, 2.7 mi S of SR4 (along Grays River) 50’ asl, N46°18.499’, W123°40.128’, 17 January 2004, W. Leonard, C. Richart. ff. Rock Creek at Elochamin River, N46°16.578, W123°16.771’; 317’ asl 10 January 2004, W. Leonard, C. Richart, m. 11.7 mi up Elochamin Valley Rd from SR4, 450’ asl, N46°19.007’, N123°15.702’, 28 March 2004, C. Richart, mm, 9.5 mi N of SR14, 500’ asl, N46°17.37’, W123°15.86’, 27 December 2004, W. Leonard, mm. Pacific Co: Sawlog Slough Campground, Long Island, 27 January 2003, C. Richart, m. Trap Creek, 1.1 mi N of SR12, 3 May 2003, W. Leonard, m. 1.1mi S of Rt. 6 on Trap Creek Road, N46°32.581’, W123°36.908’, 19 November 2005, W. Leonard, C. Richart, mm. Walberg Road, 1.0 mi N of Chinook Valley Road, 9 May 2003, W. Leonard, m. Ellsworth Creek Preserve, 50’ asl, N46°23.887’, W123°53.391’, 23 November 2003, W. Leonard et al, mm, ff. 4.5 mi N of Rt. 4 on US 101, at Middle Nemah River, N46°29.224’, W123°53.192’, 15 January 2006, W. Leonard, C. Richart, mm. South Fork of Willapa River drainage, 6 mi S of Raymond, 250’ asl, N46°34.51’, W123.°3.30’, 5 August 2006, C. Richart, m. 8 mi SE of Menlo, 150’ asl, 12 December 2005, A. Foster, f. Cowlitz Co.: Germany Creek, 5.5. mi N of SR4, N46°15.65’, W123°08.06’, 350’asl, 8 December 2003, W. Leonard, m. SR504, 9.8 mi E of Toutle, 750’asl, N46°21.893’, W122°35.300’, 1 March 2004, W. Leonard, C. Richart, m. Pin Creek, 0.5 mi E of Carrolls, red cedar, bigleaf maple forest, 2 March 2003, W. Leonard, f. 12.7 mi E of Frontage Road on Rose Valley Road, N46.1692°, W122.7080°, 166 m asl, 29 April 2007, W. Leonard, C. Richart, f.

Figures

FIGURE 42. Female Trisaria olympia, lateral view.

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.

FIGURES 32–35. Trisaria washingtonensis gonopods. Fig. 32. Anterior view. Fig. 33. Posterior view. Fig. 34. Lateral oblique view. Fig. 35. Ventral view; sp?, possible spiracle. All other labels as in Figs. 20 & 21.

FIGURES 36–38. Trisaria washingtonensis. Fig. 36. Head, collum and first 2 rings of female. Fig. 37. Head and collum of male. Fig, 38. Anterior end of male, lateral view; col, collum, l1, leg 1; l2, second leg, mand, mandible, r2, pleurotergite 2. Fig. 39. Coxae 2 of male, anteriolateral view; cx2, coxa 2, cp, coxal process, gp, gonopore.

FIGURES 40, 41. Trisaria washingtonensis. Fig. 40. Coxae 3 of male, posterior view; cx3, coxa 3, st3, sternum of legpair 3. Fig. 41. Gonopod complex, ventral view; cx 6, coxa 6, cx7, coxa 7, gp, gonopods, t9, telopodite of leg 9.

FIGURES 43–47. Trisaria olympia. Fig. 43. Anterior end of female, lateral view. Fig. 44. Legpair 1 of male, posterior view. Fig. 45. Specialized setae of femur and tibia 1 of male. Fig. 46. Specialized setae of tarsus 1 of male. Fig. 47. Genitalia of female, ventral view; lo, left operculum, lv, left valve, ro, right operculum, rv, right valve.