Polynoncus crypticus Dieguez 2019
Creators: name: Costa-Silva, Vinícius
name: Strümpher, Werner P.
name: Thyssen, Patricia J.
name: Vaz-de-Mello, Fernando Z.
Publisher: name: Zenodo
Year: 2024
Subjects: Biodiversity
Taxonomy
Animalia
Arthropoda
Insecta
Coleoptera
Trogidae
Polynoncus
Polynoncus crypticus

description: Polynoncus crypticus Diéguez, 2019
(Figures 4d, 15, 22)
Polynoncus crypticus Diéguez, 2019: 88 (original description); Mondaca 2023: 209 (checklist from Chile)
Type specimens examined. HOLOTYPE. (♂ MNNC – Figure 22) First label [yellow, typeset]: ‘ HOLOTIPO / Polynoncus / crypticus nov. sp. / V. M. Diéguez 2019 ’. Second label [white, typeset]: ‘ CHILE X REGIÓN / 7 km. W. Pargua, Ainco / 25 Diciembre 2010 / Leg. Gerardo Arriagada / Colectados a la luz’ (Figure 22d). Type locality: ‘ 7 km West of Pargua, Ainco’ (or Ahinco), Los Lagos (X Region), Chile.
PARATYPES (1 ♂ CEMT; 2 ♂ and 1 ♀ CVMD). First label [white with black border, typeset]: ‘Pte. Aserradero / Las Trancas – Chillán / S36°54.95 – W71°27.49 / 1295 msnm 29/XII/2016 / Col. Thomas Fichet’. Second label [yellow, typeset]: ‘ PARATIPO / Polynoncus / crypticus nov. sp. / V.M. Diéguez 2019 ’ (1 ♂ CEMT). First label [white with black border, typeset]: ‘ Chile, Llanquihue / Puerto Montt, 7 km. W de Pargua / Ainco, 25. Diciembre.2010 / leg. Gerardo Arriagada’. Second label [yellow, typeset]: ‘ PARATIPO / Polynoncus / crypticus nov. sp. / V. M. Diéguez 2019 ’ (1 ♀ CVMD). First label [white with black border, typeset]: ‘ Chile, Malleco / Cuesta Las Raíces / Febrero 2001 / leg. Alfredo Ugarte’. Second label [yellow, typeset]: ‘ PARATIPO / Polynoncus / crypticus nov. sp. / V.M. Diéguez 2019 ’ (1 ♂ CVMD). First label [white with black border]: ‘ Chile, Capitán Prat / Cochrane, 3.Febrero.1990 / leg. Luis Peña G’. Second label [yellow, typeset]: ‘ PARATIPO / Polynoncus / crypticus nov. sp. / V.M. Diéguez 2019 ’ (1 ♂ CVMD).
Differential diagnosis. Polynoncus crypticus is very similar to and often confused with P. diffluens. However, the lateral margins of the pronotum in P. crypticus are slightly crenulate with an emargination in front of the acute posterior angles. Polynoncus diffluens not have any emargination and has a round posterior angle of pronotum. For details of description and additional differential diagnosis, see Diéguez (2019, p. 88).
Geographic distribution. Polynoncus crypticus is known from a few localities in Chile, where it appears to be associated with Nothopagus (Nothofagaceae) forests found in central-southern Chile (Figure 15). This species also occurs sympatrically with Polynoncus diffluens.
Remarks. After re-examination of the type series of Polynoncus crypticus, we observed an acute tooth on the apex of the inner margin of mesotibia present in all the males (in ventral view; Figure 22b). The latter is clearly absent in females. This character, which was overlooked by Diéguez (2019), is externally visible and sexually dimorphic. No other material was examined beyond the type series.
description: Published as part of 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), pp. 14-166 in Journal of Natural History 58 (1 - 4) on pages 65-66, DOI: 10.1080/00222933.2023.2260060, http://zenodo.org/record/10830771