Cenomana clavata Otto, 2019

Otto, Robert L., 2019, Descriptions of two new elateroid beetles (Coleoptera: Eucnemidae, Elateridae) from Burmese amber, Insecta Mundi 702 (702), pp. 1-6 : 3

Cenomana clavata Otto , sp. nov.

Fig. 1–2

Holotype. Small , round, clear, polished yellow-colored amber piece with little debris intermixed with the specimen. Piece was excavated from northern Myanmar believed to be Cenomanian in age, approximately 96 million years old. Holotype is deposited in the collection of the Global Eucnemid Research Project ( GERP) maintained at University of Wisconsin-Madison Department of Entomology, Madison, Wisconsin .

Description. Holotype: Length, 3.0 mm. Width, 0.75 mm. Body elongate, parallel-sided and tapering towards the elytral apex; head, pronotum, elytra and venter dark black ( Fig. 1 ). Head: Subspherical; surfaces dullish, with small, rounded, evenly spaced granules; dark black. Antennae: Extending slightly beyond elytral humeri; antennomeres IX–X asymmetrical, widest apically, basally narrowed; antennomere XI basally bulbous, asymmetrical, dark black. Pronotum: Dull; surfaces with small, rounded, evenly spaced granules; base sinuous, with median groove extending near center of disc; dark black. Scutellum: Elongate, subtriangular and distally rounded. Elytra: Somewhat dullish with enlarged, elongate, evenly spaced granules; lateral sides constricted below humeri; interstices strongly elevated apically along elytral suture; dark black. Venter ( Fig. 2 ): Shiny; surfaces with crowded granules; dark black.

Etymology. Specific epithet is derived from the presence of loosely arranged clavate terminal antennal segments.

Remarks. The specimen has been keyed out as a member of the tribe Jenibuntorini within Macraulacinae through the higher classification key in Muona (1993) with one extant genus. Jenibuntor Muona is a monotypic genus presently distributed on the Australian continent. Jenibuntor is a relatively large sized species (14.0–16.0 mm long), similar to Phlegon Laporte and Euryptychus LeConte with produced frontoclypeal region. The tribe is distinguished by its gradually enlarged antennomeres IX–XI, with antennomere X being shorter than IX within the subfamily Macraulacinae . Although Cenomana do possess the gradually enlarged terminal antennal segments and antennomere X shorter than IX; it lacks the produced frontoclypeal region present in Jenibuntor and being quite small in size (3.0 mm long). Granulose exoskeletal surfaces in Cenomana is a unique feature within the tribe. Coarse, dense punctures are present in Jenibuntor .

Figures

Figures 1–4. Fossil elateroids. 1) Cenomana clavata holotype, dorsal habitus. 2) Cenomana clavata holotype, ventral habitus. 3) Cretopityobius pankowskiorum holotype, dorsal habitus. 4) Cretopityobius pankowskiorum holotype, ventral habitus. (Scale: 1–4 = 1.0 mm)