Aegognathus arnaudi Cáceres, Ríos-Málaver, and Grossi, 2019

Cáceres, Juan Sebastián D. & Grossi, Paschoal Coelho, 2023, Taxonomic revision of Aegognathus Leuthner, 1883 (Coleoptera: Lucanidae), Journal of Natural History 57 (9 - 12), pp. 557-595 : 590

Aegognathus arnaudi Cáceres, Ríos-Málaver, and Grossi, 2019

Aegognathus arnaudi Cáceres et al., 2019: 2152 (original combination and description)

( Figure 5f–g : holotype J and paratype ♀)

Examined material

Holotype male labelled: ′ Peru, Region de Junín, Satipo Province, Arpayo , −11.457 / −76.643, 1800 m, 26–28.ix. 2008, fermented bait in canopy, J.M. Zevallos et Aguilar colls̍. – 1J ( CERPE).

Diagnosis

Species very similar to Aegognathus waterhousei , differing in a few characters. Body black with some bluish reflections present on the elytra. Abdominal ventrites with a somewhat continuous carina along sides and lacking the setose tubercles present at the last abdominal ventrite in A. waterhousei . Large aedeagus ( Figure 8f ) compared with other Aegognathus species, dorsal cross bar slightly lobed posteriorly with no acuminate projections. Females of this species differ from males in presenting a reduction in head and mandible size; and in the punctation, which is stronger in females, with coarse dense to contiguous punctures along dorsal surface. Styli ( Figure 8g ) symmetrical with truncate apex with a short distance in between. For the complete description see Cáceres et al. (2019).

Distribution

Southern Peru, Central Cordillera. Ucayali province ( Morrone et al. 2022).

Remarks

Aegognathus arnaudi was recently described by Cáceres et al. (2019). This species is very similar to the type species A. waterhousei , differing only in a few characters, such as the missing lateral tubercles at the last ventrite and the absence of posterior projections at the dorsal cross bar of the aedeagus. According to the collection data, these two cryptic species seem to be sympatric. For the complete description, see Cáceres et al. (2019).

Figures

Figure 5. Dorsal habitus of Aegognathus damasoi Arnaud and Bomans, 2006: (a) Male and (b) female (CERPE).Aegognathus aguirei Arnaud and Bomans, 2007: (c) male and (d) female (CERPE).Aegognathus dulima Cáceres, Ríos-Málaver and Grossi, 2019: (e) holotype male (CERPE). Aegognathus arnaudi Cáceres, Ríos-Málaver and Grossi, 2019: (f) holotype male and (g) paratype female (CERPE). Scale bars: 5 mm.

Figure 8. Ventral view of A. damasoi (a) male aedeagus and (b) female genitalia. Aegognathus aguirei (c) male aedeagus and (d) female genitalia. (e) Aegognathus dulima male aedeagus. Aegognathus arnaudi: (f) male aedeagus and (g) female genitalia. Scale bars: 1 mm.