Golbachia rufa Otto, 2018

Otto, Robert L., 2018, Descriptions of two new species of false click beetles (Coleoptera: Eucnemidae) from the Bahamas, Insecta Mundi 623, pp. 1-8 : 2-3

Golbachia rufa Otto , sp. nov.

Fig. 1–3

Diagnosis. Presence of sex patch on the last abdominal sternite will distinguish G. rufa from the Nearctic G. wrighti . Overall size and coloration will further distinguish the new species from G. impressicollis .

Type material. Male holotype: “ BAHAMAS: Andros Is., Maidenhair Coppice, 11-VI-2004, M.C. Thomas, BLT ” / “ EUCNEMIDAE :, MELASINAE :, Microrhagus , albofasciatus (Fisher), Det. R.L. Otto, 2007” (‘07’ handwritten; folded) / “ HOLOTYPE:, Golbachia , rufa, Otto , det. R.L. Otto, 2017” (♂ hand- written behind species name on label) [red printed label]. Holotype deposited in FSCA .

Paratypes. 3 ♂♂: BAHAMAS: 1 ♂, “BAHAMAS: Eleuthera, Rainbow Bay , 1-VII-1988, R. W. and D.B. Wiley ” / “Collection of the Global, Eucnemid Research Project, (Robert L. Otto) (green framed white label) / “ PARATYPE:, Golbachia , rufa, Otto , det. R. L. Otto, 2017” (♂ handwritten behind species name on label) [yellow printed label] ( GERP) ; 1 ♂, “BAHAMAS: Andros Is., Forfar Field Sta., nr., Stafford Creek , 7-VI-2004, M.C. Thomas, BLT” / “ Microrhagus , albofasciatus, (Fisher), Det. R. L. Otto, 2007” (‘07’ handwritten; folded) / “Collection of the Global, Eucnemid Research Project, (Robert L. Otto)” (green framed white label) / “ PARATYPE:, Golbachia , rufa, Otto , det. R. L. Otto, 2017” (♂ handwritten behind species name on label) [yellow printed label] ( GERP) ; 1 ♂, “BAHAMAS: Andros Is., Maidenhair Coppice , 24–28-VII-2006, MCThomas, TRSmith, UV trap in interior coppice” / “ PARATYPE:, Golbachia , rufa, Otto , det. R. L. Otto, 2017” (♂ handwritten behind species name on label) [yellow printed label] ( FSCA) . Paratypes are deposited in FSCA and GERP.

Description. Male holotype: Length, 3.0 mm. Width, 1.0 mm. Body subcylindrical, elongate; uniformly reddish; antennae reddish; legs including tarsi reddish; head, pronotum and elytra clothed with short, recumbent yellowish setae ( Fig. 1–2 ). Head: Surface somewhat dullish, subspherical with closely spaced punctures; frons convex with shallow, median fovea above frontoclypeal region; apical margin of frontoclypeal region rounded, less than 2 times wider than base; compound eyes enlarged, incised; mandibles stout, bidentate, densely punctate. Antenna: Serriform from antennomeres III–XI, attaining nearly 2/3 the length of the body; antennomeres III–X each sub-equal, longer than wide; antennomere XI slightly longer than X. Pronotum: Surface dullish, densely and closely punctate; quadrate, with well-developed, sharp hind angles; sides parallel-sided, slightly widest anteriorly; disc convex without shallow median groove or circular fovea; base sinuous, with short, shallow groove above scutellum; anterior lateral pronotal ridge short, concave and directed posteroventrally; posterior lateral pronotal ridge elongate, nearly reaching anterior end of pronotum. Scutellum: Short, sub-triangular, shallowly punctate and distally rounded. Elytra: Very shallow striae present, deepest at humeral region; interstices slightly elevated; surfaces shiny with dense, crowded punctures; apices with 4 rows of deep, circular cavities. Legs: First tarsomere as long as the combined lengths of the remaining four on meso- and metatarsi; tibiae rounded in cross section; metatarsomeres I–III simple; metatarsomere IV excavated; metatarsomere V elongate with simple claws. Venter ( Fig. 3 ): Closely punctate, with elongate, recumbent yellowish setae; hypomeron with notosternal antennal grooves, inner ridge caudally obliterated; metepisterna parallel-sided; metacoxal plates medially more than 3.0–6.0 times wider than laterally; large, round sex patch present on last abdominal sternite.

Variation. Three male paratypes were examined. Male paratypes measured 3.5 mm long and 1.0 mm wide. All paratypes are slightly longer than and just as wide as the holotype. Two paratypes have a shallower median depression above the frontoclypeal region. One paratype has a deeper median impression above the frontoclypeal region. There are no other exoskeletal differences between these paratypes and the holotype.

Distribution. The eucnemid species is known from two locales on the island of Andros and a single locale on the island of Eleuthera in the Bahamas.

Biology. Three specimens were taken from a black light trap on Andros Island. Developmental stages remain unknown.

Etymology. The specific epithet is derived from the general reddish coloration of the species’ overall habitus.

Note. Identity of these eucnemids as a new species was concluded based on the comparison of these specimens against species description and illustrations of G. wrighti provided by Muona (2000) and G. impressicollis specimens in the GERP collection.

Figures

Figures 1–3. Golbachia rufa sp. nov. 1) Male holotype (FSCA), dorsal habitus. 2) Male holotype (FSCA), lateral habitus. 3) Male holotype (FSCA), ventral habitus. (Scale = 1.0 mm).