Cephennium gilberti Hopp & Caterino,

Hopp, Katie & Caterino, Michael, 2009, Seven new species of Cephennium Müller & Kunze (Coleoptera, Staphylinidae, Scydmaeninae, Cephenniini) from California with a key to native North American species, ZooKeys 24 (24), pp. 31-54: 45-46

publication ID

http://doi.org/ 10.3897/zookeys.24.247

publication LSID

lsid:zoobank.org:pub:BB883B1E-E58F-4074-92EB-7E814E78F678

DOI

http://doi.org/10.5281/zenodo.3790608

persistent identifier

http://treatment.plazi.org/id/4157F97A-FF93-FFF5-FF7E-FA2EFB8A12D9

treatment provided by

Plazi

scientific name

Cephennium gilberti Hopp & Caterino
status

sp. n.

Cephennium gilberti Hopp & Caterino  , sp. n.

urn:lsid:zoobank.org:act:307DD4D1-D511-447D-AFF4-2258EE6DFC10

Figs 1F, 2F, 3F, 6

Type Material. Holotype (unknown sex): “CALIF: Kern Co.; 5 mi. E Glenville [sic] [̴ 35.7486°N, 118.5805°W]; Alta Sierra Camp; III-12-1979; A.J. Gilbert ”/ “Berlesed;GoogleMaps 

Oak; Litter” ( CSCA). We did not risk dissecting the type to determine sex due to its uniqueness and minute size  .

Etymology. We name this species in honor of Dr. Art Gilbert, collector of the unique specimens of two of the species described herein, including this one.

Diagnosis. This species can be distinguished from its California congeners by the character combination of the eyes absent, humeral angle of the elytron raised, dorsally flattened and apically rounded ( Fig. 3FView Figure 3), scutellum with two setae ( Fig. 3FView Figure 3), and the mesosternal keel weakly divergent at the apex ( Fig. 2FView Figure 2). Th is species most closely resembles C. grandarboreum  , but can be distinguished from it by its smaller size (0.646 mm long), more elongate and slender body (Fig. 1F), the posterior angles of the pronotum being sharper in C. gilberti  (Fig. 1F), and the mesosternal keel more weakly divergent at the apex with the apex approximately only 2× as wide as the widest point anterior to the apex ( Fig. 2FView Figure 2), as opposed to the apex strongly divergent and nearly 2.4× as wide as the widest point anterior to the apex as in C. grandarboreum  ( Fig. 2DView Figure 2). C. gilberti  can be separated from C. anophthalmicum  , C. urbanum  and C. aridum  by the humeral angle of the elytron, which projects laterally to a point in these species ( Fig. 3AView Figure 3, G-H). Finally, it can be distinguished from C. celsifrons  , C. mariposae  and C. aridum  by the presence of ommatidia in these species ( Fig. 4AView Figure 4, C-D).

Description (sex unknown). Length: 0.646 mm; pronotal width: 0.228 mm; elytral width: 0.266 mm. Body elongate, slender, weakly convex, amber yellow, evenly moderately pubescent, pubescence golden, slender, moderate in length (Fig. 1F). Head small, deflexed, sparsely pubescent; frons flat; eyes absent. Antenna setose, antennomeres I and II longer than broad, antennomeres III-VI quadrate and smaller than antennomeres II and VII, antennomere VIII smaller than antennomeres VII and IX, antennomeres IX-XI gradually clavate forming a loose club. Pronotum moderately pubescent, broadest between middle and anterior third, disc very convex medially and weakly flattened near each posterior angle; anterior margin not visible from above; anterior and posterior margin lacking marginal bead; marginal bead complete laterally, gradually widening towards base; lateral edge broadly rounded to posterior third, then slightly sinuate to base (Fig. 1F). Hypomeron smooth, sparsely setose towards upper quarter and along outside (lateral) edge, hypomeral bead anterolaterad procoxae sinuate. Prosternum with prominent, bluntly triangular nodules anterolaterad procoxal cavities ( Fig. 2FView Figure 2). Elytra impunctate, as pubescent as pronotum, covering all abdominal segments, weakly truncate at apex; elytral suture flat; elytral striae absent; basomedial fovea present on each elytron, fovea large, with moderately dense inwardly directed setae (Figs. 1F, 3F). Humeral angles of elytron raised, dorsal plateau apically rounded, slender, barely reaching beyond anterior portion of the elytral fovae ( Fig. 3FView Figure 3). Scutellum roundly triangular, with two short setae, one on each side of the midline ( Fig. 3FView Figure 3). Mesosternal keel setose with scalelike microsculpture over most of length, abruptly smooth near meso-metasternal junction, apex weakly divergent, angulate ( Fig. 2FView Figure 2). Metathoracic wings vestigial. Femora strongly clavate in distal half, tibiae expanded and becoming more densely setose towards distal half. Six visible abdominal sternites (fusion between ventrites V and VI not evident).

Biology. Th is species has been collected only from berlesed oak litter.

Distribution. This species is known from a single locality five miles east of Glennville, at about 1800m in the southern Sierra Nevada of Kern County, CA (Fig. 6).

CSCA

California State Collection of Arthropods