Parakari roraimensis, Derka, Tomáš, Nieto, Carolina & Svitok, Marek, 2015

Derka, Tomáš, Nieto, Carolina & Svitok, Marek, 2015, A new species of Parakari (Ephemeroptera: Baetidae) from Guiana Highlands, Zootaxa 4028 (2), pp. 296-300 : 297

Parakari roraimensis new species Derka, Nieto & Svitok

( Figs. 1–14 )

Female Imago ( Figs. 1–3 ). Length (mm): body 4.5–4.7; fore wings 6.1–6.6. Head reddish brown ( Figs. 1–2 ), compound eyes blackish, ocelli black. Antennae: scape and flagella pale yellow, pedicel reddish brown. Thorax reddish brown, a yellowish band along midline. Pleurae yellowish, sterna pale yellowish. Legs pale yellow. Wings hyaline ( Fig. 3 ), costal and subcostal fields of fore wings translucent, with paired marginal intercalary veins, except in the cubital field where they are single. Abdomen, terga I–VIII, reddish, terga IX–X reddish brown, segment II–VII with a pair of yellowish marks along lateral margin, sterna pale yellow.

Nymph ( Figs. 4–14 ). Length (mm): body 4.2–5.2; cerci 2.1; terminal filament 1.8. Head yellowish brown. Eyes: compound eyes yellowish-brown, ocelli black. Antennae yellowish. Mouthparts ( Figs. 4–9 ): Labrum wider than long ( Fig. 4 ), dorsally with four subapical setae near midline, two inner shorter than the others. Left mandible ( Fig. 5 ) with incisor bearing 8–9 teeth apically, prostheca robust with 15–16 denticles, thumb of molar area transverse to anterior margin. Right mandible ( Fig. 6 ) with prostheca bifid basally. Hypopharynx with lingua subequal to superlinguae ( Fig. 7 ). Maxillae ( Fig. 8 ) with palpi slightly longer than galea-lacinia, segment I shorter than segment II. Labium ( Fig. 9 ) with paraglossae with one nonpectinate blade-like seta on apical margin of each paraglossa, segment II of palpi with a thin distomedial projection, segment III 1. 5 longer than wide.

Thorax, forewing pads and pleurae yellowish brown. Sterna pale yellow. Legs ( Fig. 10 ) yellowish, fore femur with a row of 25–27 spines like setae on dorsal margin, mid femur and hind femur with 22–23 and 14–15 spines like setae respectively; all femora with a pair of spine like setae apically. Tarsal claws with 10–12 denticles ( Fig. 11 ). Abdomen yellowish brown. Terga with scales and scale bases, posterior margin of terga I–II with rounded projection, terga III–IX with pointed spines, rounded projections, and with spaces between them ( Fig. 12 ). Sterna pale yellow. Gills whitish, elongated, subequal in length to each tergum, main and few secondary trachea pigmented ( Fig. 13 ). Paraprocts with 9–11 spines and a blunt lateral process ( Fig. 14 ). Caudal filaments yellowish.

Etymology. The species is named after the mountain Roraima-tepui, where it was collected.

Diagnosis. Parakari roraimensis sp. n. can be distinguished from the other species of the genus by the following combination of characters. In the nymph: 1) labrum ( Fig. 4 ) with four subapical setae near midline, two shorter than the others; 2) prostheca of right mandible bifid basally ( Fig. 6 ); 3) segment II of labial palpi with a thin distomedial projection ( Fig. 9 ); 4) posterior margin of terga III–IX with pointed spines and rounded projections ( Fig. 12 ); 5) paraprocts with a blunt lateral process ( Fig. 14 ). In the female imago: abdominal terga II–VII with a pair of yellowish marks along lateral margin.

Material. Holotype: male nymph ( IBN): VENEZUELA, Bolívar Province, Roraima-tepui, stream in the tourist base camp below SW wall of Roraima-tepui, N 5º 08' 56.71" W 60º 46' 52.34", 1870 m a.s.l., 7.II. 2014, leg. T. Derka. Paratypes ( IBN, MIZA, FNS): 8 females, 18 nymphs (2 dissected): same data as holotype, 16 nymphs, same locality and collector, 14.II. 2012; 2 females imagoes, 2 nymphs, same locality and collector, 10.II. 2015; 1 nymph, same locality and collector, 3.II. 1999; 1 nymph (dissected and preserved on slide), same locality, 3.II. 2007, leg. T. Derka & M. Svitok.

Habitat. The specimens were collected in a 2 m wide, cool hypocrenal-epirhitral stream with a temperature of 16 ºC. The stream is completely shaded by a dense cloud forest. The stream bed is composed of stones, boulders, sand and debris accumulations in pools.

Figures

FIGURES 1 – 3. Parakari roraimensis sp. n. Female imago. 1, dorsal view; 2, lateral view; 3, fore wing.

FIGURES 4 – 14. Parakari roraimensis sp. n. Nymph. Mouthparts (Figs. 4 – 9): 4, labrum, left d. v., right v. v.; 5, left mandible v. v.; 6, right mandible v. v.; 7, hypopharynx v. v.; 8, maxilla v. v.; 9, labium, left d. v., right v. v.; 10, fore leg I; 11, fore tarsal claw I; 12, posterior margin of tergum IV; 13, gill IV; 14, paraproct. (v. v: ventral view; d. v.: dorsal view).