Annomus bolivianus 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 : 33-35

Annomus bolivianus Halstead , new species

( Fig. 120–122 , 126 )

Description. This description is based on two specimens, one of each sex, from the same locality and exhibiting very little variation in body measurements. Nevertheless, measurements are included for both, those for the holotype (male) first. Length 2.18 mm (both types the same length) length to breadth ratios, 28:10, 26:10; pubescence obvious; color dark brown.

Head. Breadth (across eyes) to length ratio of both specimens, 10:15; sides in front of eyes gradually converging to rounded apex; margins slightly raised above antennal insertions; eyes extremely large and very prominent; temples virtually absent; pubescence semi-recumbent directed towards middle from each side, particularly on vertex; vertex densely punctured with large, shallow punctures each with central seta, as on pronotum; antennal length to total body length ratios, 10:30, 10:25, apical antennomeres 9–11 forming a club, antennomere 8 smaller than 7 and 9, 4 shorter than 3, scape moderately robust, base hidden; maxillary and labial palps as in Silvanus spp. ( Halstead 1973) .

Pronotum. ( Fig. 120 ) Broader than long, greatest breadth excluding teeth to length ratios, 11.7:10.0, 12.6: 10.0; sides with 5 teeth, those at anterior and posterior angles not as prominent as others, each tooth with two long apical setae; densely punctured as on vertex of head; transverse somewhat oval depression present medially at basal quarter.

Scutellar shield. Broad.

Elytra. Length (both types) 1.7× maximum breadth; sides gradually tapered to apices, outer margins with a row of fringing setae, coarser, more erect and prominent than others, becoming shorter towards apices; strial punctures deep with area around each shallowly depressed, forming 9 rows of strial punctures on each elytron, 7 visible in dorsal view plus 2 before the lateral margin, punctures gradually becoming smaller after basal third and becoming indistinct towards apices (part of rows on basal third illustrated on Fig. 120 , for details see Fig. 126 ).

Thoracic sterna. All parts densely punctured (particularly the mesosternal process) consisting of large punctures separated by less than one diameter.

Legs. Tarsomeres 1–3, produced below, each forming a conspicuous lobe; protibiae abruptly expanded on apical half ( Fig. 120 ).

Procoxal cavites. Closed behind.

First abdominal ventrite. Without femoral lines.

Male genitalia. ( Fig. 121–122 ) Parameres at outer side of apical half bent over towards middle and consequently apices appear pointed, each paramere with 3 setae on margin; median lobe large, shallowly emarginate at apex; median strut broad, parallel sided to rounded apex; internal sac with spines as illustrated, pair of pointed sclerites near apex before ejaculatory duct, without an armature of rods; sternite 8 bearing a few short setae at sides ( Fig. 122 ).

Material examined. Holotype (male) and paratype (female) both with same locality and collecting data, “ BOLIVIA: El Beni Beni Stn , Palm Camp NE San Borja, 25–30 July 1988. T. Erwin ex: Fogging canopy”. The holotype is deposited in the USNM; the paratype in the FSCA. The holotype also has the following determination label, “new genus new species Silvaninae det M. C. Thomas 2010”.

Etymology. The generic name Annomus is an anagram of Monanus .

Figures

Figures 120–122. Annomus bolivianus, new genus, new species, male holotype. 120) Habitus, inset enlargement of some punctures on anterior pronotum to show setae. 121) Genitalia, inset enlargement of apical region of paramere. 122) Sternites 8–9. Scale lines for Figure 120 = 1.0 mm, for Figures 121–122 = 0.2 mm.

Figures 125–126. Color habitus photographs. 125) Eunausibius jatahyensis, new species. 126) Annomus bolivianus, new genus, new species.