Three new genera and eighteen new species of miniature polydesmid millipedes from the northwestern United States (Diplopoda, Polydesmida, Polydesmidae) Author Shear, William A. Professor Emeritus, Department of Biology, Hampden-Sydney College, Hampden-Sydney VA 23943; present address 1950 Price Drive, Farmville VA 23901. Author Marek, Paul E. 0000-0002-7048-2514 Associate Professor, Department of Entomology, Virginia Polytechnic Institute and State University, Blacksburg, VA 24061. pmarek @ vt. edu; https: // orcid. org / 0000 - 0002 - 7048 - 2514 pmarek@vt.edu text Zootaxa 2021 2021-05-24 4975 1 81 126 journal article 6194 10.11646/zootaxa.4975.1.3 529d48db-4299-4e2d-9aaf-6c4178c08b18 1175-5326 4804909 DB7C9028-3EDF-454F-88D0-336624AD1DC4 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 .