Hovahydrus sp.

Alarie, Yves, Michat, Mariano C., Ranarilalatiana, Tolotra & Bergsten, Johannes, 2022, Larval morphology of the Madagascan endemic diving beetle genus Hovahydrus Biström, 1982 (Coleoptera: Dytiscidae) and phylogenetic comparison with other known Hyphydrini, Zootaxa 5219 (3), pp. 227-246 : 231

Hovahydrus sp.

near H. minutissimus ( Régimbart, 1903)

Source of material. The four instar III larvae studied were associated with adults collected at the following locality: Madagascar: Antsiranana: Sava Marojejy National Park :mid-high altitude rainforest: watersource stream to camp III, 100 m from camp, MAD18-34 . 14.4373S, 49.7428E, 1330 m, 11.II.2018. Leg J. Bergsten & T. Ranarilalatiana .

Diagnosis (instar III). The instar III larvae of Hovahydrus sp. can easily be distinguished from those of H. praetextus by the following combination of characters: smaller size, HL = 0.71–0.76 mm; head capsule sagittate, frontoclypeus broad, subquadrate apically ( Fig. 2 ); parietale with a reduced number of temporal spines in dorsal view ( Fig. 2 ); metathoracic leg elongate,> 3.00 times HW; femora, tibiae and tarsi with a lesser number of secondary setae ( Figs 9–10 ; Table 2 ); abdominal segment VIII distinctly constricted at point of insertion of urogomphi ( Fig. 11 ).

Figures

FIGURES 2–3. Hovahydrus sp. near H. minutissimus (Régimbart, 1903), instar III: (2) head capsule, dorsal aspect; (3) head capsule, ventral aspect. Scale bar = 0.2 mm.

FIGURES 8–10. Hovahydrus sp. near H. minutissimus (Régimbart, 1903), instar III: (8) labium, dorsal aspect; (9) mesothoracic leg, anterior aspect; (10) mesothoracic leg, posterior aspect. CO: coxa; FE: femur; LA: labium; NS: natatory setae; TA: tarsus; TI: tibia; TR: trochanter. Numbers and lowercase letters indicate primary setae and pores, respectively; others are secondary setae. Pore TRb not represented. Scale bars: 8 = 0.05 mm; 9–10 = 0.1 mm.

FIGURES 11–12. Hovahydrus sp. near H. minutissimus (Régimbart), 1903, instar III: (11) abdominal segment VIII, dorsal aspect; (12) abdominal segment VIII, ventral aspect. Scale bar = 0.2 mm.