Plaramia 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 : 519-520

Plaramia Shear & Marek , new genus

Type species: Plaramia arcata Shear & Marek , n. sp.

Etymology: The genus name is an arbitrary combination of letters, an anagram of the related genus name Amplaria forming a Latin neologism to be treated as feminine in gender.

Diagnosis: The flagellocoxites are long, thin and largely concealed in this genus and the ninth leg telopodites are free. Thus we place the genus in Striariinae . Three of the striariine genera described in this paper have their metazonital crests all roughly subequal and not paranota-like. The two species of Plaramia , n. gen., differ from those of Maraplia , n. gen., in that the gonopod anterior angiocoxites are erect and sinuously curved, rather than reflexed anteriorly and either short or if long, curved in an arc. In Ralampia , n. gen., the gonopods are quite compact, and the colpocoxites have long, erect, branched, stiff fimbriae distally.

Description: Small striariines, about 3–4 mm long ( Fig. 46 ). Thirty postcephalic rings, including telson. Two ommatidia on each side of head ( Fig. 45 , om). Head ( Fig. 37 ) densely setose, with small tubercles. Labral hook lacking. Mandibular stipes with serrate margin, acute triangular process. Collum with crests limited to posterior region, studded with small tubercles. Metazonital crests 1–5 subequal ( Fig. 41 ), crest 6 slightly elevated as paranota (though variably so; Fig. 46 ); metazonital setae long, with brush-like tips. Telson with lobes very shallowly demarcated or nearly indiscernable, sulci shallow. Legpair 1 ( Fig. 37 , L 1 ) larger than legpairs 2 or 3, femora and tibiae with long, needle-like setae, tarsus with comb. Legpair 2 with short telopodites, vas deferens openings in coxae facing mesally, coxae notched so that when appressed, a single pore is formed. Legpair 3 with relatively short flasks ( Figs 38 , 48 , cf), reaching fifth coxae when extended posteriorly, heavily set with raised cuticular scales, few contorted setae. Legpairs 4–7 crassate, legpair 7 lacking coxal lobes.

Gonopod sternum large, broader than long ( Fig 43 , s). Coxa with 4–6 setae, coxal process absent. Anterior angiocoxites long, not deflexed, sinuously curved or with hooked termination ( Figs 42, 43 , 72, 73 ). Posterior angiocoxites small, inconsipicuous, forming short sheath for flagellocoxites. Flagellocoxites single, long, thin, concealed by angiocoxites. Colpocoxites large, sac-like, seemingly well sclerotized, with fine longitudinal ridges but lacking fimbriae. Ninth legs ( Figs 44 , 78 ) with coxosternite and free telopodites. Coxosternite with two processes from coxal part, sternal part sometimes expanded, with central knob. Telopodite large, variable, with pebbled sculpture and setae, with deep notch to accommodate gonopods. Telopodite locks into deep notch in ventrolateral margin of pleurotergite 7.

Tenth legs with coxal pores, coxae slightly enlarged.

Distribution: Humboldt Co., California.

Figures

FIGURE 1. Nototrisaria ornata, n. gen., n. sp., live female in habitat. About 5.0 mm long. Photo by Bill Leonard.

FIGURES 45–48. Striariid millipedes. Fig. 45. Ommatidia and Tömösváry organ of Ralampia complexa, n. gen., n. sp. Figs 46–48. Ralampia filamentosa, n. gen., n. sp. 46. Female, lateral view. 47. Right leg 1 of male, posterior view. 48. Legpairs 2–5 of male, ventral view. Abbreviations: L2–5, legs 2–5, respectively; om, ommatidium; To, Tömösváry organ.

FIGURES 35–40. Striariid millipedes. Figs 35, 36. Rampalia cheathamensis, n. gen., n. sp. 35. Coxae of male legpair 7, ventral view. 36. Gonopods, anterioventral view. Figs 37–40. Plaramia arcata, n. gen., n. sp. 37. Head, collum and ring 2 of male, lateral view. 38. Legpair 3 coxae of male, ventral view. 39. Gonopods, ventral view. 40. Right gonopod, mesal view. Abbreviations: aac, anterior angiocoxite; cc, colpocoxite; cf, coxal flask of leg 3; col, collum; cp, coxal process; cx, gonopod coxa; cxs, coxosternite of leg 9; cx5, coxa of leg 5; cx7, coxa of leg 7; L1, leg 1; m, mandible; s, sternum of gonopods; t9, telopodite of leg 9; 2, ring 2.

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.

FIGURES 71–78. Striariid millipedes. 71. Right leg 9 of male Lamparia millicoma, n. gen., n.sp., anterior view. Figs 72– 75. Rampalia cheathamensis, n. gen. n. sp. 72. Right gonopod, lateral view. 73. Right gonopod, mesal view. 74. Male ninth legpair, anterior view. 75. Male ninth legpair, posterior view. Figs 76–78. Plaramia arcata, n. gen., n. sp. 76. Right gonopod, lateral view. 77. Right gonopod, mesal view. 78. Left leg 9 of male, anterior view. Abbreviations: aac, anterior angiocoxite; cc, colpocoxite; cxp, coxal process; cx, gonopod coxa; fc, flagellocoxite; pac, posterior angiocoxite; t9, telopodite of ninth leg.