Kilariodes marifae, Sartori & Derleth, 2010

Sartori, Michel & Derleth, Pascale, 2010, The dipterous Leptophlebiidae of Borneo (Insecta, Ephemeroptera), Zootaxa 2490, pp. 33-39 : 36-38

Kilariodes marifae sp. nov.

Material examined. Holotype: 1 female larva, Indonesia - East Kalimantan, Malinau Basin, Langap Sud (1997-petak 6), Belakau stream, tributary of the Rian River , 116°30'26''E / 3°04'04''N; 100 m. a.s.l., 20.04.2001, (B0113), P. Derleth & M. Sartori [ MZL]

Paratype: 1 female larva, same data as holotype (partially mounted on microscopic slide) [ MZL]

Nymph. Body length at least 4.6 mm for female sub mature nymphs. Cerci slightly shorter than body length.

General colouration of head, thorax and abdomen medium brown, without specific patterns, sternites yellowish brown; legs uniformly yellowish.

Antennae ca 1.5 longer than head width. Labrum ( Fig. 7) ca 2.75 wider than long (measurement in the sagittal plan), anteromedian emargination with irregular denticles ( Fig. 8); dorsal side with a sub distal row of long setae, scattered long setae on the ventral side. Left and right mandibles ( Figs 9–10) with a hump in the middle of the outer margin, bearing a dozen of very long and thin simple setae; a row of long setae on the dorsal face, some feathered in the distal half; outer and inner incisors elongated, each constituted of three teeth; prostheca more developed on the left mandible ( Fig. 9); a row of 6–7 long and thin setae below the mola of the right mandible ( Fig. 10). Maxillae with crown of setae covering almost the apex of the galea ( Fig. 11).

Maxillary palp with segment 1 the longest, two times longer than wide, segments 2 and 3 subequal in length, each ca 0.75 times the length of segment 1; outer margin of segment 3 with long and thin setae, especially at apex ( Fig. 12). Superlinguae of hypopharynx with setae on dorsal margin not reaching the apex ( Fig. 14). Labial palp ( Fig. 15) with segment 1 stout, 1.3 longer than wide, inner margin strongly convex, outer margin with a row of long and pointed setae; segment 2 slighly longer than segment 1, with ca 6 long and pointed setae on proximal part of outer margin; segment 3 ca 0.6 times the length of segment 2, rounded at apex. Femora ( Fig. 16) with a row of stout and pointed setae on outer margin, ending on the dorsal face in distal part; inner margin with scattered short and pointed setae; dorsal face without any setae except 4–6 scattered long and pointed setae on proximal part. Inner margin of tibiae with stout, pointed and feathered setae, outer margin with few thin setae. Tarsal claw ( Fig. 17) moderately hooked, with a single row of 11–13 denticles, the distal 5–7 larger than the proximal ones. Gill I the smallest, ca 0.6 times the length of gill IV. Subanal plate regularly rounded. Cerci with first 10–12 segments with a posterior whorl of denticles, more distal ones without such a whorl.

Male and female adults unknown.

Etymology. This species is dedicated to Mrs Marie-France “Marif” Decker Leonnard (Pully, Switzerland), great friend of us.

Distribution and ecology. K. marifae is one of the rarest mayfly species found in our study site; it has been sampled a single time on a single stream which flows in an area which was recently logged. Water temperature during sampling was 26.1 °C, speed flow around 0.2 m /s, water depth of 0.26 m, and substrate composed mainly by gravels (70%) and cobbles (15%). Other mayfly species collected at the same time included Polyplocia campylociella Ulmer, 1939 , Potamanthus (Stygifloris) sabahensis (Bae, McCafferty & Edmunds, 1990) , Atopopus tarsalis Eaton, 1881 , Hyrtanella pascalae Jacobus & Sartori, 2004 , Dudgeodes hutanis Sartori, 2008 , Derlethina eloisae Sartori, 2008 and Isca lea sp. nov.