Coelotrachelus ixtapalapaensis, Dellacasa & Dellacasa & Gordon, 2009

Dellacasa, Marco, Dellacasa, Giovanni & Gordon, Robert D., 2009, Systematic revision of the genus Coelotrachelus Schmidt, 1913 (Scarabaeoidea: Scarabaeidae: Aphodiinae), Insecta Mundi 2009 (86), pp. 1-13 : 4-6

Coelotrachelus ixtapalapaensis new species

( Fig. 7-11 )

Type locality. Ixtapalapa, Distrito Federal, Mexico.

Type repository. United States National Museum (Washington, DC, USA).

Description. Length 6.5-7.5 mm, elongate, moderately convex, shiny, glabrous. Chestnut-brown, legs and antennal club somewhat darker. Head with epistome feebly convex on disc, extremely finely and regularly punctured throughout; clypeus slightly sinuate at middle, denticulate at sides, the very small denticles somewhat upturned, very thinly bordered, the border laterally rather elongately sparsely ciliate; genae obtuse, ciliate, protruding more strongly than eyes; frontal suture obsolete; front relatively more sparsely and superficially punctured, Pronotum broadly transverse, moderately convex, somewhat flattened at sides; doubly punctured; smaller, extremely fine and superficial punctures, subregularly scattered throughout, large punctures, five or six times larger than small, irregularly and almost sparsely arranged on sides; latter very thickly bordered, the border glabrous, S-shaped before the subdentiform hind angles; latter situated half way between the base of the fifth and sixth striae; base slightly bisinuate, not bordered. Scutellum somewhat concave, very finely punctured on basal half. Elytra oblong, moderately convex, subdenticulate at shoulder; striae fine, feebly impressed, subcrenulate; intervals nearly flat, almost imperceptibly sparsely punctured. Hind tibial upper spur as long as first tarsal segment; latter as long as following three segments combined. Male fore tibial spur relatively stout and abruptly bent downward; aedeagus Fig. 8-9 . Female: fore tibial spur relatively slender and feebly bent downward.

Type material. MEXICO, Distrito Federal: Ixtapalapa, 12.XI.1953. leg. A. Barrera, s/ nido de Cratogeomys m. merriami (Th.) ; Holotype male and allotype female ( USNM), 1 paratype male ( DCGC).

Distribution. Known from type locality only.

Etymology. The species is named for the type locality.

Bionomics. The specimens were collected in a nest of the Mexican pocket gopher Cratogeomys merriami merriami (Thomas) in November.

Figures

Figures 7-11. Coelotrachelus ixtapalapaensis n. sp., holotype. 7) Habitus (morphological details). 8-9) Aedeagus (dorsal and lateral view). 10) Habitus. 11) Epipharynx.