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 Benedictesmus timber Shear & Marek , n. sp. Figs 118–120 , 136, 137 Type. Male holotype from 0.3 mi west of SPRR overpass on SR26, 3 mi west of Timber , 45.5251°, -123.2390°, Washington Co., Oregon , collected 27 November 1971 by E. M. Benedict. The holotype is mounted on SEM stub WS33-12, deposited in CAS . Diagnosis. The terminal zone of the gonopods is unique among Benedictesmus species in that both terminal processes are bent or curled into hooks ( Figs 136, 137 ). FIGURES 111–116 . Benedictesmus yaquina , n. gen., n. sp. 111 . Male, lateral view. 112 . Head and anterior rings, dorsal view. 113 . Midbody ring, dorsal view. 114 . Pygidium, lateral view. 115 . Gonopods in situ , ventral view. 116 . Same, lateral view. SEM stub WS33-14. Abbreviations: p , pulvillus; pp , pulvillar process; tz , terminal zone. FIGURES 117–120. Species of Benedictesmus , n. gen . 117 . Gonopod tips of Benedictesmus yaquina , n. sp. , posterior view. SEM stub WS33-14. Figs 118–120 . Benedictesmus timber , n. sp. 118 . Head and anterior rings, dorsal view. 119 . Midbody ring, dorsal view. 120 . Pygidium, lateral view. SEM stub WS33-12/ Abbreviations: p , pulvillus; pp , pulvillar process; tz , terminal zone. Etymology. The species name is a noun in apposition referring to the type locality near Timber, Oregon . Description. Male holotype . Nineteen rings. Length about 5.0 mm, greatest width 0.52 mm . Head densely setose, cuticle alveolate ( Fig. 118 ). Collum ( Fig. 118 ) with anterior marginal row of 18 setae. Anterior metazonites with three rows of setae, transitioning to four rows ( Fig. 119 ) about ring 7, setal tubercles becoming almost obsolete on midbody to posterior rings. Alveolate cuticle absent from metazonite posterior to collum. Epiproct ( Fig. 120 ) greatly swollen, short, strongly decurved at nearly right angle, without alveolate cuticle. Anterior legs crassate, tarsi with sphaerotrichomes. Gonopod with flattened prefemorite. Acropodite short, robust. Pulvillus ( p, Fig. 136 ) distal just below terminal zone, pulvillar process absent. Terminal zone bifurcate, both processes strongly curved, hooklike ( Figs 136, 137 ). Females unknown. Distribution. Known only from the type locality.