Onychotillus Chapin, 1945

Opitz, Weston, 2022, Revision of the checkered beetle genus Onychotillus Chapin (Coleoptera: Cleridae: Tillinae), Insecta Mundi 2022 (913), pp. 1-16 : 2

Genus Onychotillus Chapin, 1945

Onychotillus Chapin 1945: 596 . Corporaal 1950: 45.

Type species. Onychotillus vittatus Chapin 1945: 596 .

Diagnosis. This tilline genus differs from other New World genera by an unguis that does not have an accessory tooth. Also, the primary and secondary elytral pubescence is arranged into striae. The extended form of the terminal antennomere is a characteristic that is found in other Tillinae , as in Lecontella Wolcott and Chapin.

Redecription. Size. Length 3.0– 5.5 mm; 1.0–2.0 mm. Form ( Fig. 16 ). Oblong rectangular. Vestiture. Dorsum profusely vested with short pubescence, elytral pubescence comprised of long vertical setae and shorter decumbent setae; elytral setae emerge from minute punctures. Head. Cranium subquadrate ( Fig. 1 , 3 ), frons much wider than width of eye; antenna comprised of 11 antennomeres ( Fig. 2 ), last antennomere expanded; terminal maxillary palpus digitiform ( Fig. 6 ), terminal labial palpus securiform; labrum not emarginate; gula large, transverse; post-gular process transverse ( Fig. 4 , 5 ). Thorax ( Fig. 7 ). Pronotum oblong, expanded at middle 1/2; subapical depression faintly expressed; collar narrow; procryptosternum complete; pronotal projections approaching prointercoxal process; femora gradually increasing in diameter; tibia without carina; tarsal spur ( Fig. 9 ); tarsus involves 4 pads, unguis bipartite ( Fig. 8 ); 10 rows of elytral punctation ( Fig. 10 ), punctation seriate. Abdomen. Pygidium transverse/scutiform; aedeagus feebly sclerotized, phallobasic apodeme rectangular, phallobase not lobed, phallobasic rod present, phallic apex adorned with cluster of spines ( Fig. 23 ).

Distribution. Jamaica, Cuba, Dominican Republic.

Figures

Figures 15–17. Habitus of Onychotillus species. 15) Onychotillus minutus. 16) O. vittatus. 17) O. woodruffi.

Figures 1–2. Structures of Onychotillus woodruffi. 1) Head. 2) Antenna.

Figures 3–4. Structures of Onychotillus woodruffi. 3) Head. 4) Post-gular process.

Figures 5–6. Structures of Onychotillus woodruffi. 5) Post-gular process. 6) Maxillary palpus.

Figures 7–8. Structures of Onychotillus woodruffi. 7) Thorax. 8) Unguis.

Figures 9–10. Structures of Onychotillus woodruffi. 9) Tarsal spur. 10) Elytron.

Figures 21–23. Aedeagus and tegmina. 21) Tegmen of Onychotillus androwi. 22) Tegmen of O. cinctipennis. 23) Aedeagus of O. apiculus.