Exochomoscirtes ruforotundus ( Watts, 2004 ) Ruta & Yoshitomi, 2010

Ruta, Rafał & Yoshitomi, Hiroyuki, 2010, Revision of the genus Exochomoscirtes Pic (Coleoptera: Scirtidae: Scirtinae) 2598, Zootaxa 2598 (1), pp. 1-80 : 47-48

Exochomoscirtes ruforotundus ( Watts, 2004) comb. nov.

Scirtes ruforotundus Watts, 2004: 151

( Fig. 5K , 12N–O , 36 , 37 )

Studied material. Male ( EUM): “ Mt. Batukau / Tabanan, C. Bali / Indonesia / 27.V.2005 / H. Takizawa ” [printed label]. Male ( EUM): “ Lake Tamblingan / Buleleng, Bali Is. / Indonesia / 25.V.2005 / H. Takizawa ” [printed label]. 2 Males ( DBET): “ Qld Fitzroy Island / 11/9/08 CHS Watts” [printed label] .

Diagnosis. Similar to E. retusus (CHAMPION) , but apices of parameroids are not emarginate. See remarks below.

Distribution. Australia (north Queensland, Northern Territory), north coast of New Guinea ( Watts 2004), Bali (new record).

Biology. Larvae live in dense concentrations in water-filled tree holes (Watts pers. com.).

Remarks. It can be noted in addition to the original description, that the dorsal surface has extremely variable colour: from all dark testaceous to elytra dark testaceous (redish black) with extensive yellowish area on disc. Photographs of male genitalia supplementing drawings in the original description are presented on Figs. 36–37 . The only feature distinguishing E. ruforotundus from E. retusus is a small detail in the morphology of the penis. It seems highly plausible that both taxa are conspecific and belong to a species which is widely distributed in North Australia, New Guinea and surrounding islands.

Figures

FIGURE 5. Abdominal details in Exochomoscirtes. A) E. dilaticornis sp. nov., ventrite 5; B) E. discoidalis (Pic), ventrite 5; C) E. jaechi sp. nov., tergite 7; D) E. klausnitzeri sp. nov., tergite 7; E) E. luteosuturalis sp. nov., tergite 7; F) E. luteosuturaloides sp. nov., tergite 7; G) E. maculatus (Waterhouse), abdomen; H) E. maculatus (Waterhouse), ventrites 3–5; I) E. nigromarginatus sp. nov., ventrite 5; J) E. quadripartitus sp. nov., tergite 7.; K) E. ruforotundus (Watts) (Australia), tergite 7; L) E. takizawai sp. nov., ventrite 5.

FIGURE 12. Habitus illustrations of Exochomoscirtes. A) E. maculatus (Waterhouse); B)–C) E. ceylonicus sp. nov.; D) E. decemguttatus (Champion); E)–G) E. klausnitzeri sp. nov., color forms F – S Thailand, male, E and G – Sarawak, females; H) E. cf. klausnitzeri (NW Thailand); I) E. luteosuturalis sp. nov.; J) E. cf. luteosuturalis sp. nov., female, Sulawesi; K) E. cf. luteosuturalis, female, Vietnam; L) E. luteosuturaloides sp. nov.; M) E. jaechi sp. nov.; N) E. ruforotundus (Watts); O) E. ruforotundus (Watts), Bali. Scale bar = 2.0 mm.

FIGURE 36. Exochomoscirtes ruforotundus (Watts). A) sternite 9; B) tergite 8; C) tergite 9; D) tegmen; E) penis. Scale bar = 0.5 mm.

FIGURE 37. Exochomoscirtes ruforotundus (Watts), specimen from Bali. A) sternite 9; B) tergite 8; C) tergite 9; D) tegmen; E) penis. Scale bar = 0.5 mm.