Stegostriaria dulcidormus Shear & Marek, 2022

Shear, William A. & Marek, Paul E., 2022, The milliped family Striariidae Bollman, 1893. V. Stegostriaria dulcidormus, n. gen., n. sp., Kentrostriaria ohara, n. gen., n. sp., and the convergent evolution of exaggerated metazonital crests (Diplopoda, Chordeumatida, Striarioidea), Zootaxa 5094 (3), pp. 461-472 : 463-467

publication ID

https://doi.org/ 10.11646/zootaxa.5094.3.5

publication LSID

lsid:zoobank.org:pub:331811B8-2976-4F3F-921D-EF1202E66C32

DOI

https://doi.org/10.5281/zenodo.6302428

persistent identifier

https://treatment.plazi.org/id/03CEBE1C-FFB7-FF8D-FF22-FB62FEB878C8

treatment provided by

Plazi

scientific name

Stegostriaria dulcidormus Shear & Marek
status

sp. nov.

Stegostriaria dulcidormus Shear & Marek , new species

Figs 1–18 View FIGURES 1–6 View FIGURES 7–11 View FIGURES 12–15 View FIGURES 16–23

Types: Male holotype and male paratype from Sweet Home Road , 4 miles WNW of Upper Soda, Linn Co., Oregon, USA, 44.40845°N, - 122.3843°W, 1680’ asl, collected 2 July 2001 by Jessica Rykken. Parts of the holotype are mounted on SEM stub WS34-2 and parts of the paratype on SEM stub WS10-1. GoogleMaps Male and female paratypes from Forest Road 14, 2.2 miles NE of State Route 22, Siuslaw National Forest, Tillamook Co., Oregon, USA, 45.22483°N, - 123.83867°W, 900’ asl, collected 10 December 2005 by C. Richart and W. Leonard. Parts of the male paratype are mounted on SEM stub WS34-3. Male paratype from Munson Creek Falls State Natural Site, Munson Creek Road, 1.5 miles E of Federal Highway 101, Tillamook Co., Oregon, USA GoogleMaps , 45.3650°N, - 123.7790°W, 1710- 1750’ asl, collected 3 April 2008 by C. Richart and S. Derkarabetian. All types including SEM stubs deposited in the California GoogleMaps Academy of Sciences , San Francisco, California, USA .

Etymology: The species name is a Latin neologism, a noun in apposition composed of the words dulcis (sweet) and dormus (home), and refers to the holotype locality.

Diagnosis: See the diagnosis of the genus, above. This is the only known species.

Description: Male paratype from Sweet Home Road. Length ca. 8.5–9.0 mm, width ca. 0.8–1.0 mm. Thirty postcephalic rings including telson.

Head densely setose, with light, pebbled sculpture; labrum (lab) smooth, labral corners rounded, without projecting hook ( Fig. 1 View FIGURES 1–6 ); 5–7 poorly pigmented ommatidia on each side.Antennae short, robust. Mandibular stipes with finely saw-toothed distal edge and blunt apical lobe ( Fig. 1 View FIGURES 1–6 ).

Collum broadly expanded, with 10 low crests occupying posterior 5/6 th. Second ring with all crests subequal. Second crests slightly exaggerated on third ring; on subsequent rings second crests 4–5 times higher than others, intercalary crests developing between median sulcus and first pair of crests ( Figs 2–4 View FIGURES 1–6 ). Limbus of metazonites serrate ( Fig. 5 View FIGURES 1–6 ). Metazonital setae not observed, possibly absent.

Telson with deep incisions between lobes ( Fig. 4 View FIGURES 1–6 ); without crests, sculpture of low tubercles each with two posterior-pointing, acute processes ( Fig. 6 View FIGURES 1–6 ).

First legpair enlarged, larger than second or third legpair, set with long, needle-like, apically bifurcate setae; tarsi with ventral comb of flattened, twisted setae ( Fig. 1 View FIGURES 1–6 ). Second leg pair with reduced telopodites ( Fig. 7 View FIGURES 7–11 ); coxae (cx2) enlarged, bearing opening of vas deferens (vd), with prominent anterior process (cp2) set with long, serrate setae; prefemora (tr2) somewhat enlarged, also with serrate setae ( Fig. 8 View FIGURES 7–11 ). Third legpair with long, curved coxal flasks (cf) directed posteriorly, anterior row of curled setae, telopodites a little larger than those of second legs ( Figs 7, 9 View FIGURES 7–11 ). Fourth legpair coxae (cx4) bearing posteriodistal lobe (cxl4), telopodites enlarged ( Fig. 7 View FIGURES 7–11 ). Fifth and sixth legpairs with enlarged, but not flattened telopodites ( Fig. 7 View FIGURES 7–11 ). Seventh legpair with enlarged coxae (cx7) bearing strong lobes ( Fig. 10 View FIGURES 7–11 ), telopodites elongate, prefemur distally swollen ( Fig. 7 View FIGURES 7–11 ). All legs with scattered, flattened setae with finger-like projections ( Fig. 11 View FIGURES 7–11 ) becoming longer and more slender on distal podomeres, transitioning on tarsi to flattened, serrate-edged setae with long, filamentous projections ( Fig. 12 View FIGURES 12–15 ).

Gonopods ( Figs 13–17 View FIGURES 12–15 View FIGURES 16–23 ) small, complex. Gonopod sternum completely encircling gonopods but for small median posterior gap, with central knob and lateral flaring wings (s, Figs 13, 14 View FIGURES 12–15 ). Coxae elongate laterally, possibly fused in midline, with two groups of setae (cx, Fig. 14 View FIGURES 12–15 ). Anterior angiocoxites (aac, Figs 13–17 View FIGURES 12–15 View FIGURES 16–23 ) divided, anterior branch (ab, Fig. 17 View FIGURES 16–23 ) apically blunt, posterior branch (pb, Fig. 17 View FIGURES 16–23 ) with 3 or 4 long, acute apical processes; seen basally in anterior view, anterior angiocoxite supports linear array of long, thin, curved processes forming a comb ( Fig. 17 View FIGURES 16–23 ). Posterior angiocoxites (pac, Figs 13–17 View FIGURES 12–15 View FIGURES 16–23 ) complexly lobed, basally with irregular array of fimbriae ( Figs 15 View FIGURES 12–15 , 17 View FIGURES 16–23 ). Colpocoxites not divided, present as acuminate lobe divided into many fimbriae (cc, Figs 15 View FIGURES 12–15 , 17 View FIGURES 16–23 ). Ninth leg pair strongly reduced, sternum (s9), coxae (cx) and telopodites (t9) fused ( Fig. 18 View FIGURES 16–23 ); coxae with bifurcate distomesal processes (cp, Fig. 18 View FIGURES 16–23 ); telopodites largely smooth, lobed, with tuft of stout setae (t9, Fig. 18 View FIGURES 16–23 ).

Female paratype closely similar to male in all nonsexual characters.

Distribution: Known only from Linn and Tillamook Counties in Oregon, USA. The Tillamook localities are within 10 miles of each other, but are separated by about 90 miles from the Linn locality; despite this distance, specimens from the two regions are morphologically inseparable. This species should be looked for in the intervening region.

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