Pseudocanthon vazdemelloi Nazaré-Silva & Silva, 2021

Nazaré-Silva, Everton E. & Silva, Fernando A. B., 2021, A taxonomic revision of the South American species of Pseudocanthon Bates, 1887 (Coleoptera: Scarabaeidae: Scarabaeinae: Deltochilini), Zootaxa 5027 (1), pp. 61-86 : 75-76

publication ID	https://doi.org/ 10.11646/zootaxa.5027.1.3
publication LSID	lsid:zoobank.org:pub:D8FE51C2-C34F-47CE-87FC-80BAB16C54BD
persistent identifier	https://treatment.plazi.org/id/038A87A7-FFF3-FFA0-71F5-FD2DB93E1F16
treatment provided by	Plazi
scientific name	Pseudocanthon vazdemelloi Nazaré-Silva & Silva
status	sp. nov.

Treatment

Pseudocanthon vazdemelloi Nazaré-Silva & Silva View in CoL , new species

( Figs. 2A, 2C View FIGURE 2 , 3D View FIGURE 3 , 4C View FIGURE 4 , 5D View FIGURE 5 , 6D View FIGURE 6 , 7B View FIGURE 7 )

urn:lsid:zoobank.org:act:FF662C35-03A0-4A96-A93C-8567FC58F15C

Etymology. The species is named after the Brazilian scarabaeidologist Fernando Zagury Vaz-de-Mello as recognition for so many years of fruitful collaboration with the second author, and for his valuable contributions towards the taxonomy of dung beetles.

Diagnosis. Pseudocanthon vazdemelloi is similar to P. pantanensis and P. chaquensis in having the pronotum with dense, well-impressed granulate microsculpture centrally ( Fig. 2A View FIGURE 2 ). However, P. vazdemelloi can be easily distinguished by the eighth elytral stria absent or reduced to basal one-fourth of the elytra ( Fig. 2C View FIGURE 2 ); posterior edge of metafemur regularly curved, not projected towards the abdominal ventrites ( Fig. 4C View FIGURE 4 ); apex of parameres curved inward, forming an acute spiniform projection at ventral edge ( Fig. 5D View FIGURE 5 ); frontolateral peripheral (FLP) endophallite elongate, bifurcate at inferior portion ( Fig. 6D View FIGURE 6 ); and accessory endophallite (AE) small and elongate ( Fig. 6D View FIGURE 6 ). In P. pantanensis and P. chaquensis , in turn, the eighth stria extends to across the basal half of the elytra ( Fig. 2D View FIGURE 2 ); and the posterior edge of metafemur is lightly angulate at basal third and expanded towards the abdominal ventrites ( Fig. 4D–E View FIGURE 4 ). In P. pantanensis , in particular, the parameres are curved and pointed apically ( Fig. 5E View FIGURE 5 ), the frontolateral peripheral endophallite is sinuous, with inferior portion rounded ( Fig. 6E View FIGURE 6 ) and the AE absent ( Fig. 6E View FIGURE 6 ), whereas in P. chaquensis the parameres are truncate apically ( Fig. 5F View FIGURE 5 ). We did not find any significant differences in the shape of frontolateral peripheral endophallite and accessory endophallite between P. vazdemelloi and P. chaquensis . Both species have frontolateral peripheral endophallite elongate, bifurcate at inferior portion, and AE small, elongate ( Figs. 6D, F View FIGURE 6 ).

Description. Holotype. Length. 5.0 mm. Width. 3.3 mm. Colour. Surface of body dark brown with metallic green reflections; legs orange; orange spot on clypeus and on last abdominal ventrite. Surface punctation and sculpturing. In general, surface punctation consists of foveolate punctures. Surface of head, mesoventrite, metaventrite, elytra, abdomen, tibiae, and femora with dense and well-impressed granulate microsculpture; lateral edges and anterior angle of pronotum, hypomera, lateral edges, and anterior portion of metaventrite, mesepimeron, metanepisternum, epipleuron, tibiae, and femora with imbricate microsculpture. Pronotum with dense and wellimpressed granulate microsculpture centrally ( Fig. 2A View FIGURE 2 ). Elytra. Eighth elytral stria absent or reduced to basal one-fourth of the elytra ( Fig. 2C View FIGURE 2 ). Legs. Posterior edge of metafemur regularly curved, not projected towards the abdominal ventrites ( Fig. 4C View FIGURE 4 ). Tegmen. Apex of parameres curved inward, forming an acute spiniform projection at ventral edge ( Fig. 5D View FIGURE 5 ). Endophallus. Frontolateral peripheral (FLP) endophallite elongate, bifurcate at inferior portion ( Fig. 6D View FIGURE 6 ); acessory endophallite (AE) small and elongate ( Fig. 6D View FIGURE 6 ).

Type material. 6♀ and 6♂. Holotype. BRAZIL: MATO GROSSO: Poconé, Pousada Araras , [16°30’43.39’’S; 56°42’41.61’’W], 03.XII.1998 GoogleMaps , J. Moreno & T. Mestre— 1♂ ( CEMT). Paratypes. BRAZIL: MATO GROSSO: Poconé, Pousada Araras , [16°30’43.39’’S; 56°42’41.61’’W], 03.XII.1998 GoogleMaps , J. Moreno & T. Mestre— 4♀ 3♂ ( CEMT). ARGENTINA: FORMOSA: Parque Nacional Pilcomayo , [25°08’43.11’’S; 58°11’11.78’’W], 76 m, 17.XII.1990 GoogleMaps ,

J. Peck — 1♂ ( CMNC) ; SANTA FÉ: Rosário , [32°57’31.33’’S; 60°41’34.95’’W], 32 m, I.1939, no collector— 1♀ 1♂ ( CMNC) GoogleMaps ; CORRIENTES: [27°28’09.17’’S; 58°49’50.29’’W], 63 m, III.1976, Martínez — 1♀ ( CMNC) GoogleMaps .

Distribution. Known from Argentina (Corrientes, Formosa, and Santa Fé) and Brazil (Mato Grosso) ( Fig. 7B View FIGURE 7 ). Areas of endemism [South America]: Brazilian subregion: South Brazilian dominion: Rondônia province. Chacoan subregion: Chacoan dominion: Chaco province (see Morrone 2014: fig. 12).