Plaramia arcata Shear & Marek, 2022

Shear, William A. & Marek, Paul E., 2022, The millipede family Striariidae Bollman, 1893. VI. Six new genera and thirteen new species from western North America (Diplopoda, Chordeumatida, Striarioidea), Zootaxa 5205 (6), pp. 501-531 : 520

publication ID	https://doi.org/ 10.11646/zootaxa.5205.6.1
publication LSID	lsid:zoobank.org:pub:9D1DEC25-5FA2-4D64-807E-F103C3FCB5CA
DOI	https://doi.org/10.5281/zenodo.7318675
persistent identifier	https://treatment.plazi.org/id/03F89303-FFAF-FFA2-9AF9-2D29E681F8C9
treatment provided by	Plazi
scientific name	Plaramia arcata Shear & Marek
status	sp. nov.

Treatment

Plaramia arcata Shear & Marek , n. sp.

Figs 37–40 View FIGURES 35–40 , 76–78 View FIGURES 71–78

Types: Male holotype, 2 male paratypes and female paratype from the north side of Jolly Giant Canyon , Arcata Community Forest, 40.8759°N, - 124.0681°W, 400–600’ asl, collected 21 February 1978 by A. K. Johnson GoogleMaps ; two male paratypes from Arcata Community Forest , 40.8699°N, - 124.0725°W, collected 31 March 2011 by C. Richart et al GoogleMaps .; two male paratypes (parts of these are on SEM stub WS35-3) from along Jacoby Road and Kilpatrick Quarry Road, 100–200’ asl, T5N, R1E, Sec 14 (40.8279°N, - 124.0390°W) collected 24 November 1977 by A. K. Johnson GoogleMaps ; six male and two female paratypes from behind Humboldt State University campus, Arcata Community Forest, 40.8748°N, - 124.0506°W, 200–700’ asl, collected 1 April 1979 by A. K. Johnson. All material deposited in FSCA GoogleMaps .

Etymology: The name is derived from the type locality, Arcata Community Forest, and is a noun in apposition.

Diagnosis: The two species of this genus are closely similar, but Plaramia arcata , n. sp., can be distinguished from P. johnsonae , n. sp., by details of the gonopods and ninth legs. The gonopods of the latter species have more curved anterior angiocoxites than the former, with a hooked termination, and the ninth leg telopodites are deeply notched. C6 of this species are very prominent, they are less so in P. johnsonae , but this difference can only really be seen in comparison.

Description: Male holotype. Length 3.8 mm, width 0.4 mm; 30 rings. Two black ommatidia on each side of head ( Fig. 37 View FIGURES 35–40 ). C6 moderately extended as paranota. Telson lobes shallowly divided, nearly obscure. Metazonital setae obvious only on anterior rings, relatively short, acute. Color after long preservation pale yellowish tan. First legs enlarged ( Fig. 37 View FIGURES 35–40 , L 1 View FIGURE 1 ), with needle-like setae. Second legpair smaller, when coxae apposite, appearing to have common seminal opening. Flasks of third coxae short ( Fig. 38 View FIGURES 35–40 , cf), when extended posteriorly reaching to anterior margin of fifth coxae; telopodites with broad, flattened prefemora. Fourth through sixth legs encrassate, podomeres flattened, with prominent characteristic modified setae. Seventh coxae lacking lobes. Gonopods Figs 39, 40 View FIGURES 35–40 , 76, 77 View FIGURES 71–78 ) moderately large. Sternum massive, short. Coxae with 3 or 4 setae on lateral side, extended into short, triangular process ( Fig. 76 View FIGURES 71–78 , cx). Anterior angiocoxites curved laterally, then mesally, without branches, slightly flattened at tip ( Figs 40 View FIGURES 35–40 , 76, 77 View FIGURES 71–78 , aac). Posterior angiocoxites small, low, with two processes; reduced to sheath for single flagellocoxite ( Fig. 77 View FIGURES 71–78 , fc). Single flagellocoxite long, thin, evenly curved, possibly movable (there may be a basal articulation). Ninth legs ( Fig. 78 View FIGURES 71–78 ) with broad, plate-like coxosternal process ( Fig. 77 View FIGURES 71–78 , cxp); telopodites ( Fig. 39 View FIGURES 35–40 , 77 View FIGURES 71–78 , t 9 View FIGURES 7–9 ) free, large, flattened, notched on mesal surface to embrace gonopod anterior angiocoxites, laterally fitting tightly into notch in seventh pleurotergite ( Fig. 39 View FIGURES 35–40 ). Tenth coxae not much swollen, gland openings anteriodorsal.