Calvariomorphus peterseni ( Klausnitzer, 1973 ) Ruta & Yoshitomi, 2022

Ruta, Rafał & Yoshitomi, Hiroyuki, 2022, Calvariomorphus-a new genus of marsh beetles (Coleoptera: Scirtidae) with remarkable elytral excitators, Zootaxa 5120 (1), pp. 65-82 : 77

Calvariomorphus peterseni ( Klausnitzer, 1973) , comb. nov.

( Figs 6 , 12 )

= Cyphon peterseni Klausnitzer, 1973: 109

= Contacyphon peterseni ( Klausnitzer, 1973) : Zwick et al. 2013: 345

Type material. Holotype, male ( ZMUC): “ Bismarck Isl. Dyaul \ Sumuna \ 7. March 1962 \ Noona Dan. Exp. 61- 62”; “ Holotypus \ Cyphon \ peterseni \ KLAUSNITZER, 1973 ”.

Diagnosis. Small species (TL 1.8 mm), body widest in the middle of elytra, trigonium of penis slightly shorter than parameroids, parameroids with denticles on outer margins.

Redescription. Body very small, TL 1.8 mm, TL/EW ~ 1.6, oval, light brown, legs and antennae yellowish, covered with yellowish semierect setae. Head strongly transverse, punctation sparse, punctures separated by ca. 2 diameters. Pronotum transverse, anterolateral and posterolateral angles right angled, lateral carinae almost straight, punctation sparse, similar to that on head. Angle between pronotum and elytra not marked in dorsal view. Scutellar shield subtriangular, impunctate. Elytra elongate, punctation stronger than on pronotum, punctures separated by ca. 0.7–1.0 diameter.

Penis (L 0.49 mm, W 0.12 mm) symmetrical, widest in the middle of its length, pala and parameroids of similar length, trigonium shorter than parameroids, pointed at apex, parameroids with row of denticles on outer margins; tegmen (L 0.45 mm, W 0.28 mm) u-shaped, with very narrow parameres; sternite IX (L 0.45 mm, W 0.26 mm) consisting of two elongate and relatively wide hemisternites, apices subtriangular; tergite VIII missing; tergite IX (L 0.48 mm, W 0.32 mm) with short apical plate and much longer apodemes, anterior margin of apical plate with wide emargination and subtriangular outgrowths in lateral portions.

Female. Unknown.

Distribution. Known only from the type locality in Dyaul Island ( Bismarck Archipelago).

Remarks. Figure 33 in the original description shows the tegmen, not sternite IX, and figure 34 is sternite IX, not the tegmen. The type specimen is in poor condition, it is disarticulated, with right elytron missing.

Figures

FIGURE 6. Calvariomorphus peterseni (Klausnitzer), comb. nov., holotype, ventral view.A) head, ventral view, B) same, head and ventral portion of thorax, ventral view.

FIGURE 12. Calvariomorphus peterseni (Klausnitzer), comb. nov., holotype, male genitalia. A) penis, B) tegmen, C) sternite IX, D) tergite IX. Scale bar = 0.25 mm.