Tropimenelytron robustum Gusarov

Gusarov, Vladimir I., 2002, A revision of Nearctic species of the genus Tropimenelytron Pace, 1983 (Coleoptera: Staphylinidae: Aleocharinae), a new genus for North America, Zootaxa 114, pp. 1-24 : 14-17

publication ID

https://doi.org/ 10.5281/zenodo.155753

DOI

https://doi.org/10.5281/zenodo.6277330

persistent identifier

https://treatment.plazi.org/id/F207683E-6E33-C417-8C38-815EFE16FCA4

treatment provided by

Plazi

scientific name

Tropimenelytron robustum Gusarov
status

 

2. Tropimenelytron robustum Gusarov View in CoL , sp. n. ( Figs. 45­54 View FIGURES 45 ­ 48 View FIGURES 49 ­ 54 )

Sipalia columbica Fenyes (manuscript name).

Type material. Holotype:, UNITED STATES: Oregon: Clackamas Co.: 1.5 mi. S jct. US 26 & Ore35, 3500’, litter, mixed conifer forest (A. Newton, M. Thayer), 11.vii.1975 ( FMNH).

Paratypes: CANADA: British Columbia:, 25 mi. E Hope (Campbell & Smetana), 21.vi.1968;, Mt. Garibaldi, 14 km N Squamish, 4000' (Campbell & Smetana), 30.v.1968 (all ­ CNCI);, 2, Shawnigan Lake ( CASC).

Diagnosis. Tropimenelytron robustum differs from T. americanum in having mat pronotum and head, both with strong microsculpture; smaller eyes (temples 2.5­2.7 times as long as eyes) and narrower apex of median lobe of aedeagus in parameral view ( Figs. 50, 52 View FIGURES 49 ­ 54 and 40, 42 View FIGURES 39 ­ 44 ). Tropimenelytron robustum differs from T. californicum in having longer body and broader apex of median lobe of aedeagus in parameral view ( Figs. 50, 52 View FIGURES 49 ­ 54 and 60, 62 View FIGURES 59 ­ 64 ).

Description. Length 3.4­3.7 mm. Body reddish brown, elytra and legs slightly lighter.

Head surface mat, on disk with strong isodiametric microsculpture, making hard to see fine and slightly asperate punctation, distance between punctures equal to 2­3 times their diameter. Temples 2.5­2.7 times as long as eyes. Second antennal article 1.1 times as long as third, article 4 slightly transverse (ratio 1.6), articles 5­10 strongly transverse (ratio 1.8­ 2.0), last article longer than two but shorter than three preceding articles combined.

Pronotum subquadrate, 1.2 times as wide as head, width 0.53­0.57 mm, length 0.51­ 0.56 mm, length to width ratio 0.97, surface mat, microsculpture and punctation as on head. Elytra wider (0.67­0.73 mm) and as long (0.51­0.54 mm, measured from humeral angle) as pronotum (elytral length to pronotal length ratio 0.99), 1.3 times as wide as long, glossy, with isodiametric microsculpture, meshes larger than on pronotum, punctation fine and asperate, distance between punctures equal to their diameter.

Abdominal terga glossy, with fine and weak isodiametric microsculpture, with fine asperate punctation, on terga 3­5 distance between punctures equals 2­4 times their diameter, on terga 6­7 punctation finer, distance between punctures equals 3­6 times their diameter.

Male secondary sexual characters include longitudinal carina along anterior half of sutural margin of each elytron, tiny medial knob at posterior margin of tergum 3, small medial knob at apical third of tergum 4, short medial carina in front of anterior margin of tergum 7, and uneven posterior margin of tergum 8 ( Fig. 45 View FIGURES 45 ­ 48 ). Posterior margin of male sternum 8 convex ( Fig. 46 View FIGURES 45 ­ 48 ). Aedeagus as in Figs. 50­54 View FIGURES 49 ­ 54 .

Female tergum 8 with slightly convex posterior margin ( Fig. 47 View FIGURES 45 ­ 48 ), sternum 8 with straight posterior margin ( Fig. 48 View FIGURES 45 ­ 48 ). Spermatheca as in Fig. 49 View FIGURES 49 ­ 54 .

Distribution. Known from Western United States (Oregon) and Canada (British Columbia) ( Fig. 65 View FIGURE 65 ).

FMNH

Field Museum of Natural History

CNCI

Canadian National Collection Insects

Kingdom

Animalia

Phylum

Arthropoda

Class

Insecta

Order

Coleoptera

Family

Staphylinidae

Genus

Tropimenelytron

Kingdom

Animalia

Phylum

Arthropoda

Class

Insecta

Order

Coleoptera

Family

Staphylinidae

Genus

Tropimenelytron

Kingdom

Animalia

Phylum

Arthropoda

Class

Insecta

Order

Coleoptera

Family

Staphylinidae

Genus

Tropimenelytron

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