Compsodactylus parvulus (Frey, 1970)

Fuhrmann, Juares, 2019, Taxonomy of Neotropical genera Compsodactylus and Dasyus and notes on claw movement in Macrodactylini (Coleoptera: Scarabaeidae: Melolonthinae), Zootaxa 4679 (1), pp. 139-163 : 142

Compsodactylus parvulus (Frey, 1970)

( Figs. 5–8 , 14–16, 19–20 , 23 , 98 )

Dicrania parvula Frey, 1970a: 287, 1972: 69 ; Fuhrmann 2012: 46.

Isonychus argentinus (misidentified); Frey, 1970b: 128 (key).

Diagnosis. Body without metallic reflections; females dorsoventrally flattened; elytral striae irregularly and shallowly punctate; metatibia of males abruptly enlarged in proximal third ( Fig. 15 ); females with inner distal area of gonocoxite straight.

Description. Emendation to Fuhrmann (2012) redescription, first description of male. Males ( Figs. 5–6 ) fusiform in dorsal view and females dorsoventrally flattened ( Fuhrmann 2012: fig. 6); length: 5.3–5.5 mm; greatest width at half of elytra: 2.6–3.2 mm. Dark brown with apex of elytra light or dark brown with some pronotal areas, legs, elytra, and pygidium yellow. Head greatest width 1.1–1.2 mm; eye small in dorsal view and interocular distance 6–7 times wider than eye width (measures taken at medial area of eyes). Epistomal suture straight or slightly sinuous. Clypeus with or without spine-like setae. Pronotum length: 1.3–1.5 mm; greatest width: 1.8–1.9 mm. Elytral striae shallowly and irregularly punctate. Metathoracic legs of males ( Figs. 14–16 ) with femur slightly enlarged, posterior third with some inner spine-like setae; tibiae abruptly enlarged in first third, posterior area slightly prominent ( Fig. 16 ), transverse carina I area indistinct. Parameres as figured ( Figs. 19–20 ). Endophallus ( Fig. 23 ) with ventromedial area without asperites.

Remarks. See C. argentinus remarks above. Frey (1970b) published a revision of Isonychus Mannerheim, 1829 (Macrodactylini) from Guyana, Brazil, and Argentina and registered I. argentinus to Bolivia. This register is based on a male and four females misidentified as I. argentinus . Frey also mislabeled this male as neotype of I. argentinus ( Fig. 8 ), but the designation was never published. The present study identifies these specimens as C. parvulus .

Type series. Frey (1970a) described Dicrania parvula based on a female misidentified as male. Holotype has right flagellum, left wing and external genitalia detached; left flagellum and right protarsomeres III–V lost; labels ( Fig. 7 ): [ Bolivia | Cochabamba | Coari, 3.000 m || or. Zischka | 500m] [Type] [♀] [ Dicrania | parvula | det. Frey 1970 | sp. n.] [ Compsodactylus ♀ | parvulus (Frey, 1970) | det. J. Fuhrmann 2012].

Distribution. Bolivia: Cochabamba, Santa Cruz ( Fig. 98 ).

Material examined. (10 specimens). BOLIVIA: COCHABAMBA, Cochabamba , 3 ♂, 1 ♀ ( BMNH) , Kischka (collector), 3500 m, 1 ♀ ( ZMHU) , Zischka (collector), “Coari”, 3000 m, 1 ♀ (holotype) ( NHMB) ; SANTA CRUZ, Comarapa, Kischka (collector), 1800 m, 24.i.1959, 1 ♂ (mislabeled as neotype), 1 ♀ ( ZMHU) , 2200 m, ii.1959, 1 ♀, 2300 m, 24.ii.1959, 1 ♀ ( ZMHU) .

Figures

FIGURES 1–8. Compsodactylus. 1–3, Compsodactylus argentinus male lectotype (dorsal, lateral, labels); 4, labels of C. scabrosus male holotype (= C. argentinus); 5–6, C. parvulus male (dorsal, lateral); 7, C. parvulus female holotype labels; 8, labels of mislabeled male of C. parvulus. Scale = 1 mm.

FIGURES 9–20. Male appendages. 9, Dasyus collaris metacoxa; 10, Compsodactylus argentinus metacoxa; 11, C. argentinus apex of metatibia; 12, C. argentinus metafemur and tibia; 13, C. argentinus tibia, posterior view; 14, C. parvulus apex of metatibia; 15, C. parvulus metafemur and tibia; 16, C. parvulus tibia, posterior view; 17–18, C. argentinus aedeagus (lateral and parameres in dorsal view); 19–20, C. parvulus aedeagus (lateral and parameres in dorsal view). cxk, coxa-katepisternum articulation; cxp, coxopleural articulation; cxt, coxa-trochanter articulation; mbd, marginal bead; mip, metacoxal inner process (limit in dotted line). Scale = 1 mm.

FIGURES 21–23. Compsodactylus. 21, Compsodactylus argentinus temones, dorsal; 22, C. argentinus endophallus, ventral (asperites details with relative magnification of 3x); 23, C. parvulus endophallus, ventral (asperites details with relative magnification of 3x). Scale: 0.2 mm.

FIGURES 98–99. South America distributional records. 98, Compsodactylus; 99, Dasyus. Scale = 500 km.