Polynoncus pittinoi Costa-Silva and Diéguez, 2020

Costa-Silva, Vinícius, Strümpher, Werner P., Thyssen, Patricia J. & Vaz-de-Mello, Fernando Z., 2024, Taxonomic revision of the South American genus Polynoncus Burmeister, 1876 (Coleoptera: Scarabaeoidea: Trogidae), Journal of Natural History 58 (1 - 4), pp. 14-166 : 135-136

Polynoncus pittinoi Costa-Silva and Diéguez, 2020

( Figures 48 , 59 )

Polynoncus pittinoi Costa-Silva and Diéguez, 2020: 268 (original description).

Type specimen examined. HOLOTYPE. (♂ MACN – Figure 59 ) First label [white, typeset]: ‘ARGENT. CORDOBA / Depto. Calamuchita / El Sauce. Diciemb. 1973 / leg. Manuel Viana’. Second label [red, Vinícius Costa-Silva’s handwriting]: ‘ Polynoncus pittinoi ♂ / Costa-Silva & Diéguez / HOLOTYPE’ ( Figure 59e ). Type locality: ‘ Depto. Calamuchita, El Sauce’. ‘ El Sauce’ refers to Hotel El Sauce, in Santa Rosa de Calamuchita city. This hotel historically received a lot of travellers and collectors who spent time collecting around the city (Gerardo Arriagada,pers. comm.).

PARATYPES (1 ♀ CEMT and 1 ♀ CJEB) . First label [white, handwritten]: ‘ Arg . Córdoba / Yacanto / x .1970 . M. Viana’ . Second label [blue, typeset]: ‘ex coleccion / M . VIANA / ARG. 009815’. Third label [white, typeset]: ‘ Coleccion / J .E. BARRIGA / CHILE 059018’. Fourth label [yellow, Vinícius Costa-Silva’s handwriting]: ‘ Polynoncus pittinoi / Costa-Silva & Diéguez / PARATYPE ♀ ’ (♀ CEMT) . First label [white]: ‘Arg – Córdoba / Río Tercero / x .1970 . M.Viana’.Second label [yellow, Vinícius Costa-Silva’s handwriting]:‘ Polynoncus pittinoi / Costa-Silva & Diéguez / PARATYPE ♀ ’ (♀ CJEB).

Differential diagnosis. Polynoncus pittinoi is similar to P. neuquen , P. gemmifer and P. haafi . This species can be distinguished from the latter two by having antennae with yellow setae ( P. gemmifer and P. haafi have black setae in antennae). Also, P. pittinoi differs from P. neuquen by having bigger elytral tubercles, with the space between tubercles on the odd-numbered costae being smaller than tubercles’ size in P. pittinoi , while this space is bigger than tubercles in P. neuquen . For details of description and differential diagnosis, see Costa-Silva and Diéguez (2020).

Geographic distribution. Polynoncus pittinoi is only known from central Argentina ( Figure 48 ). No material was examined beyond the type series.

Figures

Figure 48. Distribution map of Polynoncus neuquen (red circles), P. patriciae (green triangles), and P. pittinoi (blue squares) in South America. The records with a black dot in the centre indicate the type locality of the respective species.

Figure 59. Holotype of Polynoncus pittinoi Costa-Silva and Diéguez, 2020: habitus in a, dorsal and b, lateral view; male genitalia in c, dorsal and d, lateral view; e, labels. Scale bar: 1 mm.