Madrasostes clypeale Paulian, 1993

Alberto Ballerio & Munetoshi Maruyama, 2010, The Ceratocanthinae of Ulu Gombak: high species richness at a single site, with descriptions of three new species and an annotated checklist of the Ceratocanthinae of Western Malaysia and Singapore (Coleoptera, Scarabaeoidea, Hybosoridae), Zookeys 34, pp. 77-104 : 84

Madrasostes clypeale Paulian, 1993 ( Fig. 2 D, Fig. 6 C, D)

Known distribution: Indonesia (Sumatra) (Paulian 1993).

New material examined: West Malaysia, Perak, 25 km NE of Ipoh, Banjaran Titi Wangsa Mounts, Gunung Korbu, 1400–1800 mt., 11–31.I.1999, leg. P. Cechovsky (ABCB); West Malaysia, Pearak, Penang Island, above botanical garden, 250 mt., 12.XI.1999, #4a, leg. Cuccodoro & Loebl, sifting forest leaf litter (MHNG, ABCB). Remarks. First record for West Malaysia (Perak and Selangor). The amazing sexual dimorphism of this species has already been described (Ballerio 2006). An examination of the microsculpturing of pronotum through scanning electron microscopy revealed that the pronotal punctures bottom surface is areolate ( Fig. 5 A, B). The larger punctures of females have the areolate surface limited to a portion of the bottom and slightly raised ( Fig. 5 C, D, E). Each puncture is often preceded by a short fine seta. It was not possible to detect any pore inside the punctures, so that the dirt which usually fills the punctures comes probably from outside. The species closest to M. clypeale is Madrasostes thai Paulian, 1987 , known only by the male holotype from Thailand (Chanthaburi province, well north of the isthmus of Kra, which is the boundary between the Sundaland and Indochinese subregions, see Corlett 2009). Both M. clypeale and M. thai represent a distinctive group within Madrasostes and their current generic placement in the genus Madrasostes must be regarded as provisional in the framework of a revision of the Perignamptus generic group.