Larval morphology of the Madagascan endemic diving beetle genus Hovahydrus Biström, 1982 (Coleoptera: Dytiscidae) and phylogenetic comparison with other known Hyphydrini Author Alarie, Yves 0000-0002-8425-087X Author Michat, Mariano C. 0000-0002-1962-7976 University of Buenos Aires, Faculty of Exact and Natural Sciences, Department of Biodiversity and Experimental Biology, Laboratory of Entomology, Buenos Aires, Argentina. https: // orcid. org / 0000 - 0002 - 1962 - 7976 & CONICET-University of BuenosAires, Institute of Biodiversity and Experimental and Applied Biology (IBBEA), Buenos Aires, Argentina. Department of Entomology, Faculty of Sciences, Box 906, Antananarivo University, 101 Antananarivo, Madagascar. https: // orcid. org / 0000 - 0002 - 0371 - 2893 Author Ranarilalatiana, Tolotra 0000-0002-0371-2893 Author Bergsten, Johannes 0000-0002-6153-443 Department of Zoology, Swedish Museum of Natural History, SE- 104 Stockholm, Sweden. https: // orcid. org / 0000 - 0002 - 6153 - 443 Corresponding author. yalarie @ laurentian. ca; https: // orcid. org / 0000 - 0002 - 8425 - 087 X yalarie@laurentian.ca text Zootaxa 2022 2022-12-09 5219 3 227 246 journal article 207188 10.11646/zootaxa.5219.3.2 ed7f0feb-1f43-4121-997b-472368629c9d 1175-5326 7429777 B991E7BD-7C15-42E6-A00E-C6C3BB8B9E5A Hovahydrus praetextus ( Guignot, 1951 ) ( Figs 13–16 ) Source of material. The only instar III larva studied was associated with adults collected at the following locality: Madagascar : Antsiranana : Sava Marojejy National Park :alpine, above treeline:small clearwater stream with knee-deep pools, below summit: MAD18-31 . 14.4506S , 49.7318E , 2060 m , 10.II.2018 . Leg J. Bergsten & T . Ranarilalatiana . Diagnosis (instar III). The instar III larvae of Hovahydrus praetextus can easily be distinguished from those of Hovahydrus sp. by the following combination of characters: larger size, HL = 1.13 mm ; head capsule pear-shaped, frontoclypeus narrower, rounded apically ( Fig. 13 ); parietale with a large number of temporal spines in dorsal view ( Fig. 13 ); metathoracic leg shorter, <2.90 times HW; femora, tibiae and tarsi with a larger number of secondary setae ( Figs 15–16 ; Table 2 ); abdominal segment VIII lightly constricted at point of insertion of urogomphi ( Fig. 14 ).