Cretakarenni birmanicus, Peris & Delclòs, 2015

Peris, David & Delclòs, Xavier, 2015, Fossil Monotomidae (Coleoptera: Polyphaga) from Laurasian Cretaceous amber, Organisms Diversity & Evolution (New York, N. Y.) 15 (2), pp. 333-342 : 335-336

Type species Cretakarenni birmanicus sp. nov.

Diagnosis Vertex of head punctured; metacoxae widely separated; postcoxal lines present, diverging posteriorly; subtriangular tibiae; tarsal formula 5–5–5; tarsomere 1 small, some tarsomeres ventrally lobed.

Description Body flattened, lateral margins subparallel; dorsal surface conspicuously setose ( Figs. 1a and 2a ).

Head narrower than prothoracic width, slightly declined. Head with elongated rostrum, constricted posteriorly to form a neck; vertex of head punctured. Compound eyes protuberant, entire, coarsely faceted. Antennal insertion concealed from above; antennae ten-segmented, capitate, with one-segmented club, not reaching middle of prothorax.

Prothorax subquadrate, anterior half slightly wider than posterior half, widest in the middle; lateral margins slightly sinuate, carinate, finely crenulated, and setiferous ( Figs. 1a and 2a ). Anterior angles of pronotum rounded; pronotal disk punctured; base of prothorax distinctly narrower than elytral bases. Prosternum anteriorly longer than prosternal process, coarsely punctured; prothoracic episternum clearly delimited by complete notosternal suture ( Figs. 1b and 2b ).

Scutellum as long as wide, narrowed posteriorly and rounded apically. Elytral absutural lines distinctly expressed along the apical half of the elytra.

Procoxal cavities markedly transverse, externally separate; procoxal trochantins exposed ( Figs. 1b and 2b ); mesocoxal cavities widely separated. Metasternum coarsely punctured; metaventral medial line long; metacoxal cavities widely separated; metacoxae not extending laterally to meet elytra. Trochanters prominent; femora with inner depression to receive the tibiae; subtriangular tibiae; outer apical angle of tibiae with two spines. Tarsal formula 5–5–5, first tarsomere small and some tarsomeres slightly lobed ventrally ( Fig. 2c ).

Abdomen with five ventrites. Postcoxal lines on ventrite 1 slightly curved, divergent ( Figs. 1b and 2b ). Ventrite 1 longest, as long as ventrites 2 and 3 combined, coarsely punctured between the postcoxal lines; ventrites 2–4 subequal in length; ventrite 5 one-and-a-half times length of ventrite 2.

Figures

Fig. 1 C. birmanicus sp. nov., JZC Bu–33C, holotype, from Myanmar; a photo and camera lucida illustration of dorsal habitus; b photo and camera lucida illustration of ventral habitus. Scale bars=0.5 mm. Abbreviations: absutural lines, al; scutellum, sc; notosternal suture, ns; prosternal process, pp; trochantin, tr; abdominal process, ap; postcoxal lines, pl

Fig. 2 C. hispanicus sp. nov., MCNA–8655, holotype, from Spain; a photo and camera lucida illustration of dorsal habitus; b photo and camera lucida illustration of ventral habitus; c camera lucida illustration of protarsi. Scale bars in a, b= 0.5 mm, c=0.1 mm. Abbreviations: absutural lines, al; scutellum, sc; notosternal suture, ns; prosternal process, pp; trochantin, tr; abdominal process, ap; postcoxal lines, pl