Onthophagus chilapensis Gasca-Álvarez, Zunino and Deloya, 2018

Gasca Álvarez, Héctor Jaime, Zunino, Mario & Deloya, Cuauhtémoc, 2018, The ninth brachypterous Onthophagus Latreille (Coleoptera: Scarabaeidae: Scarabaeinae) of the world: a new species from Mexico, Journal of Natural History 52 (33 - 34), pp. 2121-2132 : 2122-2127

publication ID	https://doi.org/ 10.1080/00222933.2018.1515382
publication LSID	lsid:zoobank.org:pub:747118CE-6A93-401A-8625-5A75479980AD
persistent identifier	https://treatment.plazi.org/id/B906879C-782C-8C7C-AFEE-FA5BFE5AE0F3
treatment provided by	Carolina
scientific name	Onthophagus chilapensis Gasca-Álvarez, Zunino and Deloya
status	sp. nov.

Treatment

Onthophagus chilapensis Gasca-Álvarez, Zunino and Deloya View in CoL , new species

( Figures 1 View Figure 1 , 2 View Figure 2 )

Type material

Holotype male deposited in Colección Nacional de Insectos , Instituto de Biología , UNAM (Ciudad de México), with the following collection label: ‘ MÉXICO, Guerrero, Chilapa, “ Parque Juan N. Álvarez ”, en “ Ocotal ”. Bosque de Quercus , 31-vi-2012, S. González- Hilario y O. J. García-Días cols . ’ Paratypes: 10♂♂ and 9♀♀ same data as holotype; 1♂ and 2♀ same data as holotype except 28 April 2012; 6♂ and 1♀ same data as holotype except 31 July 2012; 4♀♀ same data as holotype except 31 August 2012. Paratypes deposited in following entomology collections: Instituto de Ecología A . C. ( Xalapa ) , Centro de Estudios en Zoología . Universidad de Guadalajara (Guadalajara), Mario Zunino private collection, Asti (Italy), Florida State Collection of Arthropods (Gainesville), Texas A & M University Insect Collection ( College Station ), Colección de Artrópodos Universidad del Valle de Guatemala ( Ciudad de Guatemala ), Canadian Museum of Nature (Ottawa) and Instituto de Ciencias Naturales, Universidad Nacional de Colombia (Bogotá) .

Description

Holotype male ( Figure 1 View Figure 1 (a – g)). Length 10.2 mm. Maximum width (at the middle of the prothorax) 6.3 mm. Colour. Black, pronotum and head distinctly glossy, elytra dull. Head. Surface strongly punctate, glabrous, punctures coarse and deep; lateral margin sinuate with small punctures, genal sutures conspicuous. Clypeus strongly concave, pentagonal, rounded shaped in dorsal view, anterior margin strongly reflexed. Clypeal carina transverse, prominent and weakly curved medially, frontal carina transverse, strong and slightly sinuated medially. Pronotum. Surface glabrous, with strong, deep punctures and smaller fine punctures distributed irregularly. Pronotal prominence triangular and apically obtuse and rounded, intermediate tubercles absent, posterior tubercles strong. Disc with mediumsize and shallow punctures. Lateral margins of pronotum almost evenly rounded in dorsal view. Elytra. Elytral striae slightly glossy, with circular and very shallow punctures separated by three diameters, elytral interstriae flat and dull, with very small microsculpture. Surface of elytral intervals with very small irregularly distributed setae. Wings reduced ( Figure 1 View Figure 1 (c)), length 2.7 mm. Pygidium. Surface with microsculpture similar to elytral intervals, with some strong irregularly distributed punctures. Apical margin surface smooth between fine punctures. Legs. Foretibiae long and slender, strongly curved on apical third, and slightly wider, apical tooth triangular and covering the insertion point of the apical spur, spur curved ventrally. Genitalia. Parameres short, wide, apex slightly angular, forming a moderate obtuse angle with its longitudinal axis, ventral margin straight. Apex with two ventral projections weakly curved in lateral view ( Figure 1 View Figure 1 (d), 1(e). Lamella copulatrix developed; left branch concave, right branch longitudinal, apex bent to the left ( Figure 1 View Figure 1 (e)). Accessory lamella as Figure 1 View Figure 1 (g).

Female ( Figure 2 View Figure 2 (a–c)). Length 9.6 mm. Maximum width (at the middle of the prothorax) 5.7 mm. In addition to secondary sexual characters, as holotype except in the following respects: Head. Clypeus curved and clearly sinuated medially, surface with transverse punctures, frontal carina curved on both sides. Pronotum. Convex, pronotal prominence absent, with a weak depression laterally. Legs. Protibia shorter, entirely curved. Genitalia. Structures of female genitalia are shown in Figure 2 View Figure 2 (c).

Variation

Male paratypes (10). Length 9.1 – 11.6 mm. Maximum width (at the middle of the prothorax) 5.5 – 6.1 mm. Two males have an inconspicuous clypeal carina. No minor males were observed. Female paratypes (11). Length 8.6 – 10.3 mm. Maximum width (at the middle of the prothorax) 4.9 – 5.7 mm. The other paratypes do not differ significantly from the holotype. Except for the development of the secondary sexual characters and size, other characters show little variation.

Type locality

Parque Natural General Juan N. Álvarez, Chilapa de Álvarez, Guerrero, México ( Figure 3 View Figure 3 ).

Etymology

The specific epithet derives from Chilapa de Álvarez, the name of the municipality of Guerrero ( Mexico), where the new species was collected.

Diagnosis

Onthophagus chilapensis represents the third brachypterous species found in Guerrero, including O. inflaticollis Bates and O. gilli Delgado y Howden , all belonging to the chevrolati group. The new species differs from O. inflaticollis by the form of clypeal apex; while it can be distinguished from O. gilli by the presence of the clypeal carina, absent in O. gilli . The morphology of the parameres also distinguish these three species ( Figure 4 View Figure 4 ). Onthophagus chilapensis is similar to O. gilli in terms of the shape of the lateroapical projections of the parameres. Other differential characters are summarized in Table 1.

Natural history

The specimens were captured with a permanently set NTP-80 pitfall trap ( Morón and Terrón 1984), baited with decomposing squid ( Figure 5 View Figure 5 ). The habitat is a Pinus – Quercus forest, dominated mainly by Pinus lawsonii Roezl ex Gordon and Quercus liebmannii Oersted ex Trel ( Figure 6 View Figure 6 ).