Plaramia johnsonae 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 : 522-523

Plaramia johnsonae Shear & Marek , n. sp.

Figs 41–44 .

Types: Male holotype, female paratypes from Lady Bird Johnson Grove , Redwood National Park , 2.6 mi from US 101 on Bald Hills Road , Humboldt Co., California, 41.3084°N, - 124.0181°W, 1308’ asl, collected 21 December 2006 by C. Richart and A. Fusek. Parts of the male holotype are mounted on SEM stub WS35-16. Deposited in CAS .

Etymology: The name honors the late First Lady of the United States, Lady Bird Johnson (1912–2007), a firm supporter of biodiversity conservation.

Diagnosis: See the diagnosis of Plaramia arcata n. sp., above.

Description: Male holotype. Length 3.5 mm, width 0.36 mm; 30 rings. Two black ommatidia on each side of head. C6 moderately extended as paranota ( Fig. 41 ); less so than in the preceeding species. Telson lobes hardly discernable. Metazonital setae of moderate length, with brushy tips. Color (fresh specimens) pale gray, crests accentuated with brownish purple. First legs enlarged, with needle-like setae. Second legpair smaller, when coxae apposite, appearing to have common seminal opening. Flasks of third coxae short, 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 ( Fig. 42, 43 ) moderately large. Sternum ( Fig. 43 , s) massive, long. Coxae ( Fig. 43 , cx) with about 8 setae on lateral side, coxal process absent. Anterior angiocoxites ( Figs 42, 43 , aac) sigmoidially curved, apical curve results in hook-like termination, slightly flattened at tip. Posterior angiocoxites small, low, with two processes; reduced to flagellocoxite sheath ( Figs 42, 43 , pac). Flagellocoxite not observed, but presumed to be long, thin, evenly curved, possibly movable as in the preceding species. Colpocoxites large, inflated, sclerotized, striated ( Figs 42, 43 , cc). Ninth legs ( Fig. 44 ) with broad, plate-like, curved coxosternal processes ( Fig. 44 , cp); telopodites free, large, flattened, notched on mesal surface to embrace gonopod anterior angiocoxites, laterally fitting tightly into notch in seventh pleurotergite. Tenth coxae not much swollen, gland openings anteriodorsal.

Females similar to males in nonsexual characters.

Distribution: Known only from the type locality.

Figures

FIGURES 41–44. Plaramia johnsonae, n. gen., n. sp. 41. Rings 12–14 of male. 42. Right gonopod, lateral view. 43. Right gonopod, mesal view. 44. Legpair 9 of male, anterior view. Abbreviations: aac, anterior angiocoxite; cc, colpocoxite; cp, coxal process; cx, gonopod coxa; cxs, coxosternite of legs 9; fc, flagellocoxite; numerals, ring numbers; s, gonnopod sternum; t9, telopodite of ninth leg.