Retrorsioides bammerti Shear & Marek, 2021

Shear, William A. & Marek, Paul E., 2021, Three new genera and eighteen new species of miniature polydesmid millipedes from the northwestern United States (Diplopoda, Polydesmida, Polydesmidae), Zootaxa 4975 (1), pp. 81-126 : 108

Retrorsioides bammerti Shear & Marek , new species

Figs 76–78 , 130

Types. Male holotype and male paratypes from Bob Bammert Grove , Capitol State Forest , 287 ft asl, 46.8960°, - 123.0963°, Thurston Co., Washington, collected 14 November 2004 by W. Leonard. All types deposited in CAS .

Diagnosis. The sigmoid terminal zone of the gonopod (tz, Fig. 130 ) and the basal position of the pulvillus (p, Fig. 130 ) set this species apart from all others in the genus.

Etymology. The species name recognizes Robert (Bob) Bammert (1926–2019), noted Washington conservationist for whom the type locality, a grove of old-growth trees, is named.

Description. Male holotype. Length about 4.0 mm, greatest width 0.50 mm. Head densely setose, cuticle alveolate ( Fig. 76 ). Collum ( Fig. 76 ) with anterior marginal row of 14 setae. Anterior metazonites with three rows of setae ( Fig. 76 ), transitioning to four rows ( Fig. 77 ) about ring 5, posteriormost segments with five rows ( Fig. 78 ); setal tubercles becoming almost obsolete on midbody to posterior rings. Alveolate cuticle absent from metazonites posterior to collum. Epiproct ( Fig. 78 ) swollen, short, bent ventrally, without alveolate cuticle. Anterior legs crassate, tarsi with sphaerotrichomes. Gonopod with oblong, inflated prefemorite (pf, Fig. 130 ) similar to previous species. Acropodite short, stout. Pulvillus (p, Fig. 130 ) in basal third of acropodite, pulvillar process (pp, Fig. 130 ) long, acute, directed distally. Anteriorly directed process (adp, Fig. 130 ) rounded, tapering slightly, without teeth. Terminal zone (tz, Fig. 130 ) not bifurcate, sigmoidally curved. Females unknown.

Distribution. Northwestern Washington in Thurston, Pacific and Lewis Counties.

Records: WASHINGTON: Lewis Co.: Stillman Basin, 1.8 mi on Weyerhauser 4200 from road W4000, 2116 ft asl, 48.4956°, -123.2134°, 4 December 2004, W. Leonard, C. Richart, mm. Pacific Co.: 1.1 mi south of SR6 on Trap Creek Road, B-line, 46.5432°, -123/6152°, W. Leonard, C. Richart, m.

Note: At the Stillman Basin locality, this species is syntopic with Retrorsia simplicissima .

Figures

FIGURES 73–78. Species of Retrorsioides, n.gen. 73–74. Retrorsioides kittitas, n. sp. 73. Gonopods in situ, posteriolateral view. 74. Same, posterior view. 75. Gonopod tip, lateral view. SEM stub WS32-17. 76–78. Retrorsioides bammerti, n. sp. 76. Head and anterior rings, dorsal view. 77. Midbody ring, dorsal view. 78. Pygidium, ventral view. SEM stub WS33-1. Abbreviations: ac, acropodite; adp, anteriorly directed process; p, pulvillus; pf, prefemorite; pp, pulvillar process.

FIGURES 127–132. Drawings of gonopods of polydesmid species. 127. Tip of gonopod of Retrorsioides castellum, n. sp., mesal view. 128. Right gonopod of Retrorsioides linnensis, n. sp., lateral view. 129. Left gonopod of Retrorsioides kittitas, n. sp., lateral view. 130. Right gonopod of Retrorsioides bannerti, n. sp., lateral view. 131. Right gonopod of Rowlandesmus millicoma, n. sp., mesal view. 132. Right gonopod of Rowlandesmus dentogonopus, n. sp., lateral view. Abbreviations: adp, anteriorly directed process; p, pulvillus; pf, prefemorite; pp, pulvillar process; tz, terminal zone.