Onthophagus alluvius Howden and Cartwright, 1963

Arriaga-Jiménez, Alfonsina, Escobar-Hernández, Fernando, Rös, Matthias & Kohlmann, Bert, 2020, The establishment of the Onthophagus anthracinus (Coleoptera: Scarabaeidae) species complex and the description of a new species, The Canadian Entomologist 152 (1), pp. 1-17 : 11

Onthophagus alluvius Howden and Cartwright, 1963

Onthophagus alluvius ( Figs. 7–8, 11 , 16 ) is a well-established and much studied species. Elias et al. (1995) found this species in fossil packrat middens in the Bolsón de Mapimí, in the Chihuahuan Desert ( Mexico), for a Late Glacial and Holocene paleoenvironmental reconstruction study. It was found to be present in the 3.0–3.5 thousand of years before present chronosequence at Puerto de Ventanillas, Coahuila ( Mexico), where this species has not been recorded through present-day collecting. Another interesting mention of O. alluvius is by Cave (2005) who cites its presence in dog dung in Austin, Texas, United States of America.

This species was formerly known from Texas in the United States of America and from Nuevo León, Coahuila (see comment above), Tamaulipas, Querétaro, San Luis Potosí, and Hidalgo in Mexico. It is here recorded for the first time for Oaxaca, Mexico: Santiago Chazumba , San Sebastián de la Frontera , 8.vii.1999, GPS-52 (two females) ; San Juan Bautista Cuicatlán, Santiago Dominguillo , 14–16.vii.1999, 1320 m, selva intacta, human dung, A. Díaz (two females) ; Carretera Oaxaca-Cuicatlán a 50 km de Oaxaca, 14.vii.1999, dead cow, Alfonso Díaz (one female) ; Yanhuitlán , Oaxaca, 4.vi.1967, G. Halffter, V. Halffter, and P. Reyes (one male) . All specimens deposited in the Instituto de Ecología , Xalapa collection .

Figures

Figs 7–12. Species in the Onthophagus anthracinus species complex. 7, Pygidium of male Onthophagus alluvius; 8, pronotum of a male Onthophagus alluvius; 9, pygidium of male Onthophagus mextexus; 10, pronotum of a male of Onthophagus mextexus; 11, metasternal midline of a male Onthophagus alluvius; 12, metasternal midline of a male Onthophagus durangoensis.

Figs 16–20. Aedeagi of the Onthophagus anthracinus species complex. 16, Onthopagus alluvius; 17, O. anthracinus; 18, O. durangoensis; 19, O. etlaensis; 20, O. mextexus.