Labiobaetis dendrisetis, Kaltenbach & Gattolliat, 2018

Kaltenbach, Thomas & Gattolliat, Jean-Luc, 2021, New species of Labiobaetis Novikova & Kluge from Southeast Asia and New Guinea (Ephemeroptera, Baetidae), ZooKeys 1067, pp. 159-208 : 159

Labiobaetis dendrisetis

Material examined.

Papua New Guinea • 9 larvae; Central Prov. , Kokoda Trek ; 09°00'20"S, 147°44'15"E; 1390 m; i.2008; leg. Posman; (PNG 173); 2 on slides; GenBank MW868310 ; GBIFCH00763706, 592769; MZL; 7 in alcohol; GBIFCH00515630, GBIFCH00515650; MZL • 1 larva; Central Prov. , Woitape ; 08°31'35"S, 147°14'06"E; 1600 m; i.2008; leg. Posman; ( PNG 165); on slide; GBIFCH00515631; MZL • 1 larva; Central Prov., Woitape; 08°31'17"S, 147°13'41"E; 1700 m; i.2008; leg. Posman; (PNG 166); on slide; GBIFCH00592705; MZL .

Diagnosis.

Larva. Following combination of characters: A) dorsal surface of labrum with submarginal arc of long, dendritic setae setae ( Kaltenbach and Gattolliat 2018: fig. 48a, b); B) labial palp segment II with short, narrow, thumb-like, distomedial protuberance, segment III broad, rounded ( Kaltenbach and Gattolliat 2018: fig. 48k); C) mandibles with outermost incisor blade-like ( Kaltenbach and Gattolliat 2018: fig. 48g); D) fore femur length ca. 3 × maximum width, dorsal margin with ca. 20 curved, spine-like setae and proximally a partial second row of spine-like setae near margin (Fig. 14a); D) hind protoptera present; E) seven pairs of gills; F) scape without distolateral process (Fig. 17c).

Due to the limited material in the type series (holotype and one paratype), a few parts of the original description were missing, incomplete or have to be corrected:

Complementary description.

Larva (Figs 12, 19c, d). Body length 4.1-5.3 mm. Cerci broken, paracercus ca. half body length.

Colouration (Fig. 19c, d). Head dorsally ochreous, thorax and abdomen dorsally brown, with pattern as in Fig. 19c. Head, thorax and abdomen ventrally ecru, abdominal sternites VI-VIII dark brown (Fig. 19d). Legs light brown, femur with distomedial brown streak. Caudalii light brown.

Maxillary palp (Fig. 12a) ca. 1.1 × length of galea-lacinia; 2-segmented; palp segment II approx. as long as segment I; apex of last segment with slight excavation at inner distolateral margin, apically rounded.

Gills (Fig. 12b). Present on segments I-VII. Margin with small denticles intercalating fine simple setae. Tracheae extending from main trunk to inner and outer margins. Gill I as long as length of segment II. Gill IV as long as length of segments V, VI and 2/3 VII combined. Gill VII as long as length of segments VIII, IX and 1/3 X combined.

Distribution.

Papua New Guinea (Fig. 21c).