Pseudoholostrophus (Pseudoholostrophus) impressicollis

• Main Author: Pollock, Darren
• Format: Text
• Language: unknown
• Published: Zenodo 2008
• Subjects: Biodiversity; Taxonomy; Animalia; Arthropoda; Insecta; Coleoptera; Tetratomidae; Pseudoholostrophus; Pseudoholostrophus impressicollis; Canada; Pacific; British Columbia; Queen Charlotte; Carr; Rotten; Laskeek Bay; Haswell Island; Alaska
• Online Access: https://dx.doi.org/10.5281/zenodo.3793264; https://zenodo.org/record/3793264

Pseudoholostrophus ( Pseudoholostrophus ) impressicollis (LeConte, 1874) (Figs 1, 8, 17, 26) Eustrophus impressicollis LeConte, 1874: 69; Horn, 1888: 36; Leng, 1920: 238; Csiki, 1924: 10; Poole and Gentili, 1996: 299; LeSage, 1991: 246; Hatch, 1965: 67, Plate IX, fig. 1; Nikitsky, 1998: 47, Plate 7 figs 9-11; Young and Pollock, 2002: 416. Lectotype, sex unknown, labelled “Vanc. / Type 4781 / Eu. impressicollis Lec. ”, in MCZ. Diagnosis This distinctive species can be separated from all Nearctic species of Eustrophinae by the combination of the following characteristics: uniform red-brown color, short, inconspicuous dorsal pubescence, widely separated eyes, and smooth meso- and metatibiae. Description TL 6.0- 6.2 mm; GEW 2.1-2.7 mm. Body (Fig. 1) elongate oval, moderately parallel sided. Dorsal and ventral color uniformly dark rufous, including antennae and legs; dorsal pubescence very short, inconspicuous (Fig. 1); eyes (Fig. 8) widely separated (> 3 x length of first antennomere), inner margin of eye slightly emarginate; antennae (Fig. 17) relatively short, antennomeres 7-10 distinctly widened; antennomere 7 triangular, 8-10 wider than long; antennal sensilla completely annular (as in Fig. 25); last maxillary palpomere distinctly widened, securiform; prosternal process elongate, spatulate distally extended past posterior margin of procoxae, bent dorsally at distal end; prothoracic episternal suture absent; elytral punctation fine, punctures not arranged in longitudinal striae; meso- and metatibiae with scattered short spines, without oblique ridges (as in Fig. 15). Distribution (Fig. 26) Th is species is restricted to extreme western North America. In Canada, all known records are from Vancouver Island and the adjacent mainland of British Columbia, north to the Queen Charlotte Islands. Th is is seemingly one of the rarest, or most infrequently collected, species of Nearctic Eustrophinae; most localities are represented by a single specimen. US distribution: WA (Hatch 1965), OR, CA. Natural history Little is known regarding the habits of P . impressicollis . Label data indicate the following: under bark of pine; in rotten log; fungus. Material examined Specimens were examined from the following Canadian localities: BRITISH COLUMBIA: Gabriola, 2.VI.1994, BF & JL Carr, lot 7, (CARR, 1); Qualicum, 16.IX.1962, BF & JL Carr, lot 1, (CARR, 1); Vancouver Island, Kye Bay, nr. Comox, 5 m, 2.VII.1980, H. & A. Howden, (CMNC, 1); Queen Charlotte Islands, Laskeek Bay, Haswell Island, 2-22.VI.2000, 52°51’42”N, 131°41’06”W, Allombert, Sylvain, (RBCM, 1). : Published as part of Pollock, Darren, 2008, Review of the Canadian Eustrophinae (Coleoptera, Tetratomidae), pp. 261-290 in ZooKeys 2 (2) on pages 268-269, DOI: 10.3897/zookeys.2.30, http://zenodo.org/record/576400 : {"references": ["LeConte J (1874) Descriptions of new Coleoptera chiefly from the Pacific slope of North America. Transactions of the American Entomological Society 5: 43 - 72.", "Horn G (1888) Miscellaneous coleopterous studies. Transactions of the American Entomological Society 15: 26 - 48.", "Leng C (1920) Catalogue of the Coleoptera of America, north of Mexico. John D. Sherman, Jr., Mount Vernon, 470 pp.", "Csiki E (1924) Pars 77. Serropalpidae. Coleopterorum Catalogus. Volume 17. W. Junk, Berlin.", "Poole R, Gentili P (Eds) (1996) Fauna Insecta Nearctica. Vol. 1: Coleoptera, Strepsiptera. Entomological Information Services, Rockville, 827 pp.", "LeSage L (1991) Family Melandryidae, false darkling beetles. In: Bousquet Y (Ed) Checklist of Beetles of Canada and Alaska. Agriculture Canada, Ottawa, 245 - 248.", "Hatch M (1965) Th e Beetles of the Pacific Northwest. Part IV: Macrodactyles, Palpicornes, and Heteromera. University of Washington Press, Seattle, 268 pp.", "Nikitsky N (1998) Generic Classification of the Beetle Family Tetratomidae (Coleoptera, Tenebrionoidea) of the world, with description of new taxa. Pensoft Publishers, Sofia-Moscow, 80 pp.", "Young D, Pollock D (2002) Family 99. Tetratomidae. In: Arnett RH Jr, Th omas M, Skelley P, Frank J. (Eds). American Beetles. Volume 2. Polyphaga: Scarabaeoidea through Curculionoidea. CRC Press, Boca Raton. 413 - 416."]}