| Summary: | Baetis pentaphyllus sp. nov. urn:lsid:zoobank.org:pub: 32A67029-582F-40C3-9B40-66FEA0881566 (Figs 1–26) Material. Holotype larva. RUSSIAN FEDERATION: AMURSKAYA OBLAST’: Zeyskii Reserve, Zeya Reservoir Basin, Bolshoi Garmakan River, about 300 m above mouth, N 53°53.148 E 127°11.626, 02.VII.2015, T. Tiunova. Paratypes : collected the same data and place as holotype: 5 larvae, 1 larva ( BAE-BGAR1_110 ); same locality, 08.VII.2015, 4 larvae, T. Tiunova; Zeya Reservoir Basin: Malyi Garmakan River, about 500 m above mouth, N 53°52.295 E 127°10.459, 06.VII.2015, 3 larvae, T. Tiunova; Shirokovka River, about 700 m above mouth, 07.VII.2014, 5 larvae, T. Tiunova. CHUKOTKA AUTONOMOUS DISTRICT, Kolyma River Basin, Malyi Keperweim River, 2 mature larvae, N 68°23.151; E 166°80.348, 03.VIII.2016, A. Semenchenko. Description. Larvae (in alcohol). Length (mm): body 4.6–5.7; cerci 2.5–3.1. General body colour brown (Figs 1–4). Head: brown. Antennae brownish, slightly longer than ½ of body length. Scape and pedicel with hair-like setae only. Labrum distinctly wider than long (the width/length ratio 1.69–1.70); dorsal surface with 1 + 6–7 long submarginal setae, arranged in uneven row and row long pointed setae laterally on both margins (Fig. 5). Canines of left mandible with eight teeth divided into two groups (Figs 6, 12). Incisor (outer group) with four teeth; outermost tooth broadened and rounded apically; kinetodontium (inner group) with four small teeth. Both groups separated by a shallow incision. Left prostheca toothbrush-like (Figs 6, 12). The right mandible canines are also separated into two groups of teeth (Figs 7, 11). Incisor with three teeth, first tooth widened and rounded apically; kinetodontium with four teeth, from which second largest. Between the kinetodontium and incisor there is a groove. Right prostheca with four non-pointed teeth (Figs 7, 11). Maxillary palp two-segmented, individual segments approximately equal in length; surface of both segments covered with hair-like seta, which occur more ...
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