Hemibidessus conicus (Zimmermann, 1921)

Michat, Mariano C., Alarie, Yves & Benetti, Cesar J., 2022, Larval morphology of the Neotropical diving beetle genus Hemibidessus Zimmermann, 1921 (Coleoptera: Dytiscidae: Bidessini), Zootaxa 5168 (3), pp. 388-400 : 390

Hemibidessus conicus (Zimmermann, 1921)

Diagnosis (instars II–III). Within Bidessini , larvae of Hemibidessus are characterized by the following combination of characters: A3 lacking a ventroapical spinula ( Fig. 11 ); legs elongate (ratio L3/HW> 3.20); femur and tibia with natatory setae ( Fig. 7 ); secondary setae on dorsal margin of protarsus ( Fig. 7 ); urogomphus elongate (ratio U/HW ˃ 2.70), with numerous secondary setae ( Fig. 9 ); primary seta UR8 inserted apically on urogomphomere 2 ( Fig. 9 ).

Figures

FIGURES 10–16. Hemibidessus conicus (Zimmermann, 1921), instar II: (10) left antenna, dorsal aspect; (11) right antenna, ventral aspect; (12) left maxilla, dorsal aspect; (13) right maxilla, ventral aspect; (14) right mandible, dorsal aspect; (15) labium, dorsal aspect; (16) labium, ventral aspect. Numbers and lowercase letters indicate primary setae and pores, respectively.Asterisk indicates secondary seta. AN: antenna; LA: labium; MN: mandible; MX: maxilla. Scale bars = 0.05 mm.

FIGURES 4–9. Hemibidessus conicus (Zimmermann, 1921), instar III: (4) head, dorsal aspect; (5) head, ventral aspect; (6) abdominal segment VIII, dorsal aspect; (7) right metathoracic leg, posterior aspect; (8) left metathoracic leg, anterior aspect; (9) right urogomphus, dorsal aspect. CO: coxa; FE: femur; FR: frontoclypeus; PA: parietal; NS: natatory setae; PT: pretarsus; TA: tarsus; TI: tibia; TR: trochanter; UR8: urogomphal primary seta UR8. Scale bars = 0.15 mm.