Retrorsioides kittitas 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 : 105-108

Retrorsioides kittitas Shear & Marek , n. sp.

Figs 69–75 , 129

Types. Male holotype and male and female paratypes from the confluence of Stafford Creek and the North Fork of the Teanway River , Wenatchee National Forest , 2900 ft asl, 47.3497°, -120.8483°, Kittitas Co., Washington, collected 31 October 2004 by W. Leonard and J. Baugh. All types deposited in CAS .

Diagnosis. The epiproct ( Fig. 71 ) is swollen and decurved. Like the preceding species, the gonopod ( Figs 73–74 , 129 ) is short with the pulvillus and other features crowded at the distal end, but in R. kittitas , the prefemorite (pf, Fig. 73 ) is inflated and oblong with an enlarged, asetose distal part. The anteriorly directed process ( Fig. 75 ) is set on all sides with acute teeth.

Etymology. The species epithet is a noun in apposition referring to Kittitas Co., Washington.

Description. Male holotype. Length about 4.5 mm, greatest width 0.65 mm. Head ( Fig. 69 ) densely setose, cuticle alveolate. Collum ( Fig. 69 ) with anterior marginal row of 16 setae. Anterior metazonites with four rows of setae ( Fig. 69, 70 ), some of the rows irregular; transitioning to five rows posteriorly but many rows irregular. Setal tubercles becoming low on posterior segments. Alveolate cuticle absent from metazonites except for anterior margin of ring 2. Epiproct ( Fig. 71 ) swollen, short, bent ventrally. Anterior legs crassate, tarsi with sphaerotrichomes. Gonopod ( Figs 73–75 , 129 ) with oblong, inflated prefemorite (pf, Figs 73, 74 ). Acropodite (ac, Fig. 73 ) short, stout. Processes and pulvillus crowded toward tip, pulvillus (p, Fig.75 ) in distal third of acropodite. Pulvillar process (pp, Figs 74, 75 ) long, acute, hooked; anteriorly directed process (adp, Figs 73, 74, 75 ) rounded, tapering slightly, with many acute teeth, terminal zone (tz, Fig. 75 ) bifurcate, straight. Female similar in nonsexual characters, vulvae as in Fig. 72 .

Distribution. Kittitas Co., Washington.

Record: WASHINGTON: Kittitas Co.: Taneum Creek, Kittitas National Forest , 2700 ft asl, 47.1138°, - 120.8848°, 26 March 2004, C. Richart, m .

Figures

FIGURES 67–72. Species of Retrorsioides n. gen. 67, 68. Retrorsioides linnensis, n. sp. 67. Gonopod tip, posterior view. 68. Same, mesal view. 69–72. SEM stub WS33-15. Retrorsioides kittitas, n. sp. 69. Head and anterior rings, dorsal view. 70. Midbody ring, dorsal view. 71. Pygidium, lateral view. 72. Female genitalia, ventral view. SEM stub WS32-17Abbreviations: adp, anteriorly. directed process; p, pulvillus; pp, pulvillar process; tz, terminal zone.

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.