Crephelochares Kuwert, 1890

Minoshima, Yûsuke N., Fikáček, Martin & Liu, Hsing-Che, 2023, Larval morphology of Crephelochares and Peltochares (Coleoptera: Hydrophilidae), Acta Entomologica Musei Nationalis Pragae (Acta. Ent. Mus. Natl. Pragae) 63 (2), pp. 305-322 : 306-307

Crephelochares Kuwert, 1890

Diagnosis. Body slender ( Fig. 1A ). Coronal line very short ( Fig. 3A ). Nasale irregularly serrated, with one small tooth on left side ( Fig. 3C ) or with five distinct teeth ( ANDERSON 1976: fig. 9). Head capsule and head appendages with paddle-shaped setae ( Fig. 3A ). Mandibles ( Figs 4B–C ) asymmetrical; left mandible with one inner tooth bifurcate apically; right mandible with two inner teeth, distal tooth bifurcate apically, proximal tooth simple, slightly smaller than distal one. Maxillary palpomere 1 completely cylindrically sclerotized. Mentum ( Figs 4F–G ) rounded laterally. Cervical sclerites subdivided into small lateral sclerite and large mesal sclerite. Legs well developed ( Fig. 2C ). Abdominal prolegs present ( Figs 1A–C ). Acrocercus very long ( Fig. 2D ).

Comparative notes. Crephelochares larvae are similar to those of Agraphydrus Régimbart, 1903 ; they can be distinguished from Agraphydrus by the following characters: completely cylindrically sclerotised maxillary palpomere 1 ( Figs 4D–E ) (incompletely sclerotized in Agraphydrus ); maxillary palpomere 1 longer than wide (wider than long in Agraphydrus ); much longer acrocercus ( Fig. 2D ) (short in Agraphydrus ) ( Table 2). For detailed morphology of Agraphydrus , see MINOSHIMA & HAYASHI (2011) and MI- NOSHIMA et al. (2013, 2021).

Figures

Fig. 1. Third instar larvae of Crephelochares abnormalis (Sharp, 1890). A – habitus, dorsal, lateral, ventral view; B – abdominal apex, ventral view (a: proleg on segment 7, b: ventral lobe, c: acrocercus); C – left proleg, abdominal segment 6, ventral view; D, E – alive individual.

Fig. 3. Head capsule of third instar larva of Crephelochares abnormalis (Sharp, 1890). A – dorsal view; B – ventral view; C – detail of anterior margin, dorsal view.

Fig. 4. Head appendages of third instar larva of Crephelochares abnormalis (Sharp, 1890). A – antenna, dorsal view, most sensilla of gAN missing; B, C – mandibles, dorsal view; D, E – maxilla, dorsal view (D) and ventral view (E); F, G – labium, dorsal view (F) and ventral view (G).

Fig. 2. Third instar larva of Crephelochares abnormalis (Sharp, 1890).A – head, dorsal view; B – prosternum, ventral view; C – mesothoracic leg; D – spiracular atrium, dorsal view, many setae missing in the specimen.