Striaria aculeata, Shear, 2021

Shear, William A., 2021, The millipede family Striariidae Bollman, 1893: III. Four new species of Striaria Bollman, 1888 (Diplopoda, Chordeumatida, Striariidae) from Idaho, USA, Zootaxa 4920 (3), pp. 395-406 : 397-402

Striaria aculeata , n. sp.

Figs 1–13 , 22–24

Types: Male holotype, 6 male and 5 female paratypes from Meadow Creek, 46.0426°, -115.2952°, 1800’ (550 m) asl, Idaho Co. , Idaho, collected 17 April 2004 by W. Leonard and C. Richart ; 1 male and 1 female paratypes from the same locality, but 46.0426°, -115.2973°, collected 12 April 2003 by W. Leonard ; 1 male paratype from State Route 5 at Benewah / Latah County boundary, 15 mi (24 km) south of State Route 3, St. Joe National Forest , 47.0337°, - 116.6735°, 900 m asl, collected 13 May 2006 by C. Richart. Types deposited in the California Academy of Sciences , San Francisco, California. Parts of a male and a female paratype are mounted on SEM stub WS34-4, which will be deposited along with the specimens.

Etymology: The species epithet is a Latin adjective, “prickly” or “thorny” and refers to the tips of anterior angiocoxites of the gonopods.

Diagnosis: Distinct from the other species found in Idaho in the broad tips of the anterior angiocoxites, divided into many small spinules.

Description: Male paratype from Meadow Creek. Length, about 11 mm, width about 1.0 mm. Body form and secondary sexual modifications typical of the genus: labrum (lab, Fig. 1 ) with long, lateral spines (lh, Fig. 1 ). Mandibular stipes distally strongly angular (man, Fig. 1 ). First legpair ( Fig. 3 ) larger than second legpair ( Fig. 5 ), long acute macrosetae distal on prefemur, on ventral surface of femur and tibia ( Fig. 4 ), spatulate macrosetae on ventral surface of tarsus. Second legpair with fused coxae, seminal openings extended as short, membranous tubes, enlarged trochanters with groups of long, fine setae ( Fig. 5 ). Third legpair coxae (cx3, Fig. 6 ) extended ventrally as flask-shaped processes (cf, Fig. 6 ), prefemur narrow, slightly enlarged distally (pf3, Fig. 6 ). Legpairs 4–7 incrassate, prefemora distally swollen ( Fig. 6 ), with characteristic setae ( Figs 7, 8 ). Pygidium elongate, narrowed.

Gonopods ( Figs 9–13 , 22–24 ) in anterior view ( Fig. 9 ) with flattened, plate-like anterior angiocoxites, sharply bent posteriad at a transverse ridge about midway in angiocoxite length, proximal to ridge are a few low rugae. In lateral view ( Fig. 11 ), tip of anterior angiocoxite ( Figs 12, 13 , 23, 24 ) with complex array of sharply curved, acute spinules, subterminal spine sharply bent at tip, abruptly becoming acute. Posterior angiocoxites sheathing three or four flagellocoxites ( Fig. 10 ), with subterminal hook-like process, three terminal divisions. Ninth legs typical, median coxal process small, weak.

Female paratype: Similar to male but without secondary sexual modifications. Female pygidium short. Distribution : Known only from the vicinity of Meadow Creek .

Figures

FIGURES 1–6. Male Striaria aculeata, n. sp. 1. Head and collum, lateral view; 2. Lateral view of head, showing ommatidia (e) and Tömösváry organ (to); 3. Right leg 1, posterior view. 4. Specialized setae of femur and tibia of leg 1. 5. Legpair 2, posterior view. 6. Legpairs 3–5, anterioventral view. Abbreviations: cf, coxal flask; col, collum; cs, cuticle surface; ct, cerotegument; cx3, coxa of leg 3; cxt2, coxotrochanter of leg 2; e, ocularium; lab, labrum; lh, labral hook; man, mandible; pcb, postcoxal bar; pf2, prefemur of leg 2; pf3, prefemur of leg 3, s, sternum to, Tömösváry Organ; tr1, tarsus of leg 1; tp2, trochanteral process of leg 2; vd, openings of vasa deferentia.

FIGURES 7–11. Male Striaria aculeata, n. sp. 7. Specialized seta of prefemur of legpair 3. 8. Specialized seta of distal tibia of legpair 3. 9. Gonopods, anterior view. 10. Right gonopod, mesal view. 11. Left gonopod, lateral view. Abbreviations: aac, anterior angiocoxite; cx, coxa; fc, flagellocoxite; lcc, lateral lobe of colpocoxite; pac, posterior angiocoxite; s, sternum.

FIGURES 12–15. Males of new species of Striaria. 12, 13. S. aculeata, n. sp. 12. Tips of left gonopod, lateral view. 13. Tips of right gonopod mesal view. 14, 15. S. bombillus, n. sp. 14. Head and collum, frontal view. 15. Pleurotergite 8, lateral view, anterior to the right. Abbreviations: col, collum; ct, cerotegument; aac, anterior angiocoxite; fc, flagellocoxite; lab, labrum; lcc, lateral lobe of colpocoxite; pac, posterior angiocoxite.

FIGURES 22–30. Gonopods of new species of Striaria. 22–24. S. aculeata., n. sp. 22. Right gonopod, mesal view. 23. Tip of anterior angiocoxite, lateral view. 24. Same, mesal view. 25–28. S. bombillus, n. sp. 25. Right gonopod, mesal view. 26. Right gonopod, lateral view. 27. Tip of anterior angiocoxite, lateral view. 28. Same, mesal view. 29, 30. S. vagabundus, n. sp. 29. Tip of anterior angiocoxite, lateral view. 30. Same, mesal view. Abbreviations: aac, anterior angiocoxite; lcc, lateral lobe of colpocoxite; pac, posterior angiocoxite; pcc, posterior lobe of colpocoxite.