Cyphochilus flavomarginatus Frey, 1971

Sabatinelli, Guido, 2020, Taxonomic notes on the genus Cyphochilus Waterhouse, 1867 (Coleoptera, Scarabaeoidea, Melolonthinae) with description of 10 new species, Revue suisse de Zoologie 127 (1), pp. 157-181 : 161-162

publication ID	https://doi.org/ 10.35929/RSZ.0014
DOI	https://doi.org/10.5281/zenodo.6979938
persistent identifier	https://treatment.plazi.org/id/AA41AD4E-7143-FFF9-7C91-FEF7FE5DFD4C
treatment provided by	Carolina
scientific name	Cyphochilus flavomarginatus Frey, 1971
status

Treatment

Figs 6 View Figs 1-14 , 41-43 View Figs 35-46

Cyphochilus flavomarginatus Frey, 1971: 122 , figs 11-13.

Type material examined: Lectotype by present designation: NHMB; 1 ♂; LAOS: // Typus (P on red) // Laos, 1967 / Vientiane / leg. Ardoin (P) // Cyphochilus / flavomarginatus / det. G. Frey, 1970 n. sp. (P&H) //. – Paralectotypes by present designation: NHMB; 4 ♀; // LAOS, 1967 / Vientiane / leg. Ardoin (P) // Paratype (P on red) // Cyphochilus / flavomarginatus / det. G. Frey, 1970 (P&H) //. – Paralectotypes by present designation: NHMB; 1 ♂; // Paratype (P on red) // Sud Laos [South LAOS] / 1967 / Paksé / leg. Ardoin (P) // Cyphochilus / flavomarginatus / det. G. Frey, 1970 (P&H) //. ( Fig. 6 View Figs 1-14 ).

Description of the lectotype male: Size – BL: 23 mm, BW: 11 mm, BWX: 13.5 mm, situated in the third distal of elytra. Color – Integument dark brown including antennal clubs and legs; dorsal surface with scales more dense along sides of pronotum and margins, white cream on discal part of pronotum, discal part of elytra and margins of elytra, yellow on the head, lateral part of pronotum and pre-marginal sides of elytra. Head – CW/L: 2.9; anterolateral edges of clypeus rounded, lateral edges of clypeus straight and divergent posteriad; frons large, making eyes not prominent (F/O: 6); antennal club only slightly longer than antennomeres 2-7 (A2-7/CL: 0.9). Pronotum – Transverse (PnW/L: 2.2), strongly convex, slightly concave just behind eyes; apical angles flattened, right, not protuberant; basal lateral margins gently curved, basal angles obtuse and smooth. Elytra – Without any visible stria. Thoracic sterna – Surface with short, white pubescence and scales; mesosternum well developed anteriorly between the mesocoxae (MstL: 2.2 mm), pointed and curved dorsally. Abdomen – Sternites with sparse scales; pygidium convex with apical margin reflected. Legs – Protibia tridentate; slender apical tooth bigger than the middle tooth. Aedeagus – Parameres slightly asymmetric both curved dorsally; apex of both parameres prolonged in a spike ( Figs 41-43 View Figs 35-46 ).

Female: BW: 14.2 mm; BL: 25 mm; antennal club ovoid, shorter than preceding antennomeres (A2-7/CL: 2.4).

Type locality: Vientiane, capital of Laos.

Distribution: The species is known only from two localities in Laos: Vientiane (Lectotype) and Paksé. Paksé, or Pakxe, is the capital of the southern Laotian Province of Champasak (15°7′0″N, 105°47′0″E; 120 m alt.), located at the confluence of the Xe Don and Mekong Rivers.

Remarks: Cyphochilus flavomarginatus is a large species easy to recognize by the smooth aspect of elytra having their maximum width distally and by yellowish band around the sides of the body from the head to the apex of elytra. Cyphochilus flavomarginatus is close to C. sansuukyii from which is easily recognizable by the shape of parameres ( Figs 41-43 and 44-46 View Figs 35-46 ).

In the original description, Frey (1971) mentioned 6 specimens, all from Vientiane. However in six specimens labeled as types in his collection one male is from Paksé, what was apparently overlooked by him; so despite this is in contradiction with the description, it is also designated as paralectotype. The drawing of parameres showed by Frey in the description refers to the lectotype that unfortunately has damaged parameres; the Figs 42 View Figs 35-46 -43 present the real shape of parameres from the paralectotype from Paksé.