Compsodactylus argentinus
Creators: name: Fuhrmann, Juares
Publisher: name: Zenodo
Year: 2019
Subjects: Biodiversity
Taxonomy
Animalia
Arthropoda
Insecta
Coleoptera
Melolonthidae
Compsodactylus
Compsodactylus argentinus

description: Compsodactylus argentinus (Moser, 1919); new combination
(Figs. 1–4, 10–13, 17–18, 21–22, 98)
Isonychus argentinus Moser, 1919: 41; Blackwelder 1944: 230 (checklist); Frey 1970b: 128, fig. 13 (aedeagus); Evans 2003: 275 (checklist); Evans & Smith 2009: 236 (checklist).
Compsodactylus scabrosus Fuhrmann, 2012: 47; Figueroa & Neita-Moreno 2019: 588; new synonym.
Diagnosis. Body without metallic reflections; females fusiform in lateral view; elytral striae strongly and regularly punctate; metatibia of males gradually enlarged (Fig. 12); females with inner distal area of gonocoxite rounded.
Description. Emendation to Fuhrmann (2012) description (named as C. scabrosus new synonym). Body (Figs. 1–2) fusiform in dorsal and lateral view; length: 5.1–6.5 mm; greatest width at half of elytra: 2.2–3.2 mm. Dark brown with legs, elytra, and pygidium yellow. Head greatest width: 1.1–1.4 mm; eye small in dorsal view and interocular distance 5 times wider than eye width (measures taken at medial area of eyes). Epistomal suture straight or slightly sinuous. Clypeus with spine-like setae. Pronotum length: 1.7–1.9 mm; greatest width: 1.9–2.2 mm. Elytral striae strongly and regularly punctate. Metathoracic legs of males (Figs. 11–13) with femur slightly enlarged and posterior third with some inner spine-like setae; tibia gradually enlarged, posterior area almost straight (Fig. 13), transverse carina I short and with some stout setae. Parameres as figured (Figs. 17–18). Endophallus (Figs. 21–22) with ventromedial area with asperites.
Remarks. Compsodactylus argentinus and C. parvulus are quite similar to each other, and the former is distinguished as follows (opposition to C. parulus): clypeus with spine-like setae (with or without); female fusiform in lateral view (dorsoventrally flattened; Fuhrmann 2012: figs. 6, 9); elytra strongly and regularly punctate (shallowly and irregularly punctate); male metatibia progressively enlarged (abruptly enlarged in proximal third) (Figs. 12, 15); gonocoxite inner margin straight (rounded; Fuhrmann 2012: figs. 74–75). The aedeagus is helpful in species determination (Figs. 17–23). Males of C. parvulus are relatively more dorsoventrally flattened than those of C. argentinus (Figs. 2, 5), but this characteristic is much more conspicuous in females.
Distribution. Argentina: Catamarca, Salta, Tucumán (Fig. 98).
Type series. Isonychus argentinus: the species was described based on an undetermined number of specimens. A male lectotype from ZMHU (Figs. 1–2) is hereby designated. Lectotype without external damage; labels (Fig. 3): [Argentina | Pro. Salta | mtt. 1905 | Steinbach] [Isonychus | argentinus | Type Mos.] [Berlin] [LECTOTYPE | Isonychus | argentinus | Moser, 1919 | des. J. Fuhrmann | 2014 ♂] [Compsodactylus | argentinus | (Moser, 1919) | des. J. Fuhrmann | 2014 ♂]. A male paralectotype was seen from ZMHU with similar labels to the lectotype.
Compsodactylus scabrosus: the species was described based on a male holotype and two male and two female paratypes, one of these females was designated as an allotype. Holotype from CEMT without external damage; labels (Fig. 4): [ARGENTINA, SALTA | Payogasta iii.1992] [HOLOTYPE ♂ | Compsodactylus | scabrosus | det. J. Fuhrmann, 2012].
Material examined. (9 specimens). ARGENTINA: SALTA, 1905, Steinach (collector), 2 ♂ (lectotype and paralectotype of I. argentinus) (ZMHU), Payogasta, iii.1992, 1 ♂ (holotype of C. scabrosus) (CEMT), 1 ♀, 2 ♂ (paratypes of C. scabrosus) (CEMT); TUCUMÁN, San Miguel de Tucumán (“Ciudad”), A. Martínez (collector), xii.1948, 1 ♀ (paratype of C. scabrosus) (MZSP); CATAMARCA, Andalhualá, Willik-Terán (collector), 20.ii.1967, 1 ♂, 1 ♀ (CEMT).
description: Published as part of Fuhrmann, Juares, 2019, Taxonomy of Neotropical genera Compsodactylus and Dasyus and notes on claw movement in Macrodactylini (Coleoptera: Scarabaeidae: Melolonthinae), pp. 139-163 in Zootaxa 4679 (1) on pages 141-142, DOI: 10.11646/zootaxa.4679.1.9, http://zenodo.org/record/3466340