Oreodytes Seidlitz, 1887 (sensu novo)

(Figs. 1–25, 28–29)

Diagnosis. Larvae of Oreodytes can readily be distinguished from those of other species of Deronectina described in detail (i.e., Deuteronectes Guignot, 1945; Hornectes Fery & Ribera, 2018; Nectoporus Guignot, 1950; Neonectes J. Balfour-Browne, 1944) (cf. Alarie & Nilsson 1996; Alarie et al. 1996; Alarie 1997) by the following combination of characters: body fusiform, narrow (Figs 1–2); cephalic capsule distinctly constricted posterior to occipital suture; occipital suture present from instar I (Fig 5); parietale lacking pores PAd and PAe (Figs 5–6); temporal spines acute apically and strongly developed (Fig 19) (instars II and III); lamellae clypeales interrupted medially for a short distance (Fig 6) (instar I); antennomere 2 lacking secondary setae; antennomere 3 with a ventroapical spinula and pore ANf absent (Figs 7–8); primary seta AN2 inserted subapically, either lower or at about level of ventral spinula (Fig 8); maxillary cardo fused to stipes (Fig 10); primary seta MX 1 inserted on maxillary stipes (Fig 10); primary seta MX 5 present; prementum lacking lateral spinulae (Figs 11–12); legs lacking natatory setae (Figs 20–21); primary seta TR2 of trochanters present (Fig 14); spinulae present on ventral margin of tibiae and tarsi (Figs 14, 20); abdomen segments VII and VIII lacking bluntly rounded secondary setae (Fig 22); abdomen segment VIII strongly constricted posterior to insertion of urogomphi, and short, less than 0.20 times LLAS in instar III (Figs 16, 22); primary seta AB5 short, not extending beyond apex of siphon (Fig 16); urogomphus elongate, more than 1.9 times HW (urogomphomere 1 more than 1.1 times longer than HW) (Figs 18, 23); urogomphomere 1 at least 1.7 times longer than urogomphomere 2, with an additional pore and primary setae UR2, UR3, and UR4 about subequally distant (Fig 18), with secondary spine-like setae (Fig 23).