Coccidotrophus platyops Halstead, 2020

Halstead, David G. H., 2020, New and little known Coleoptera (Silvanidae: Silvaninae) from Central and South America, Insecta Mundi 2020 (842), pp. 1-37 : 23-25

Coccidotrophus platyops Halstead , new species

( Fig. 80–84 )

Description. The following description is based on one male specimen. Length 3.41 mm, total length to maximum elytral breadth ratio, 64:10; general appearance sub-cylindrical, very elongate, shining, glabrous and castaneous.

Head. Elongate, length to breadth ratio, 12:10, sides in front of eyes slightly divergent before converging to apical shallow emargination; small deep depression above each antennal insertion; eyes, in lateral view large and flat, in dorsal view appearing long and flat ( Fig. 80 ), separation about 9× maximum breadth of eye in dorsal view, in ventral view also large, separated by 5× ventral diameter; temples rounded to base of head; antennae robust, very short, about one seventh of body length, inserted beneath genae, only base of scape hidden from above, club with large broad segments ( Fig. 80 ); antennal grooves shallow and inconspicuous, similar to those of C. socialis ( Fig. 57 ); dorsal puncturation on basal third moderately dense, consisting of crescentic chains of small, elongate punctures, punctures on rest of head, particularly frons, becoming rounded.

Pronotum. Elongate, length to maximum breadth ratio, 19:10; sides almost straight but very slightly narrowed medially and inconspicuously rounded before posterior angles, all margins narrowly rimmed; anterior angles inconspicuous, not produced in front, very slightly produced laterally; posterior angles obtuse; disc medially with narrow, longitudinal impunctate line, elsewhere with elongate punctures apparently derived from pairs of punctures.

Prosternum and metasternum. Sides each with shallow depressions.

81) Metatibia and tarsus. 82–84) Genitalia and associated sternites. 82) Genitalia,

without most of internal sac. 83) Sclerotized structure at apex of internal sac. 84)

Sternites 8–9. Scale lines for Figures 80–81 = 1.0 mm, for Figures 82–84 = 0.1 mm.

Elytra. Very elongate, 3.5× as long as broad, parallel sided, rounded to apex, a narrow rim present along suture and sides of elytra (on latter hidden from above); striae consisting of small, shallow punctures (as found in other species) although smaller punctures on interstrial areas irregular and less obvious.

Legs. Male metafemora with small tooth on proximal ventral margin at about apical fifth; tibiae moderately curved; metatibiae with very small apical spine plus rows of 8–9 minute teeth along inner margins ( Fig. 81 ), almost certainly an additional secondary sexual character.

Abdomen. First ventrite with femoral lines present on basal half. Last ventrite not depressed.

Male genitalia. ( Fig. 82–84 ) Parameres elongate, about 5× as long as broad, surface of apical half with several minute, inconspicuous setae, apices with 3 long setae plus shorter one at outer margin and much smaller seta at inner margin; median lobe difficult to see in the slide preparation made but appears to be broad (see dotted line); area towards ostium with about 22 rods on each side ( Fig. 82 ); internal sac, only small sclerotized structure from its apex illustrated ( Fig. 83 ) due to damage while making preparation, rest of sac is similar to that of C. wheeleri (see Fig. 68 ); sternite 8 with a few short setae on each side ( Fig. 84 ).

Material examined. Holotype male “ BRAZIL Am. Reserva Ducke 26km NE Manaus Hurtado , J. C. G. / Micropholis guyanensis 01. ix. 1995 / Tree Nº 155 Tray Nº 5 / C 101.4 / Silvanidae det. N. P. Lord 2010” ( NHML).

Etymology. The name refers to the flat dorsal appearance of the large eyes.

Figures

Figures 80–84. Coccidotrophus platyops, new species, male holotype. 80) Habitus.

Figures 52–63. Coccidotrophus spp., all paratypes except figure 54. 52–57) C. socialis Schwarz and Barber, male. 52) Habitus. 53) Anterior pronotal angle, semi-lateral view. 54) Pronotum (left half), variant with strongly incurved sides. 55) Antenna, enlarged. 56) Elytron, small part including sutural margin enlarged to show rows of punctures. 57) Head, part of left side to show antennal groove. 58–63) C. wheeleri (Schwarz and Barber), male. 58) Habitus. 59) Anterior pronotal angle, semi-lateral view. 60) Antenna, enlarged. 61) Elytron, small part including sutural margin to show rows of punctures. 62) Hind leg enlarged, showing small femoral prominence etc. 63) Head, part of left side to show antennal groove. Scale line = 1.0 mm.

Figures 64–69. Coccidotrophus spp., paratypes, male genitalia and associated sternites. 64–66) C. socialis Schwarz and Barber. 64) Genitalia without internal sac. 65) Internal sac. 66) Sternites 8–9. 67–69) C. wheeleri (Schwarz and Barber). 67) Genitalia without internal sac. 68) Internal sac. 69) Sternites 8–9. Scale lines = 0.2 mm.