Parakari auyanensis, Nieto, Carolina & Derka, Tomáš, 2011

Nieto, Carolina & Derka, Tomáš, 2011, Parakari a New Genus of the Family Baetidae (Insecta: Ephemeroptera) from Guyana Highlands, Zootaxa 3032, pp. 47-59 : 50-52

Parakari auyanensis new species Nieto & Derka

( Figs. 1 , 4–14 )

Adult. Unknown.

Nymph ( Fig. 1 ). Length: body: 4.5–4.7 mm; cerci: 2.5–2.6 mm; terminal filament: 2.3–2.4 mm. Antennae partially broken, scape and pedicel yellowish. Head yellowish brown. Eyes: compound eyes brownish, ocelli black. Antennae, yellowish brown. Mouthparts ( Figs. 4–9 ): Labrum ( Fig. 4 ) wider than long, dorsally with one subapical setae near midline. Left mandible ( Fig. 5 ) with incisors positioned at right angle to mola area, thumb of mola area transverse to anterior margin. Right mandible ( Fig. 6 ) with prostheca bifid apically. Hypopharynx ( Fig. 7 ) with lingua longer than superlinguae. Maxillae ( Fig. 8 ) with palpi subequal in length to galea-lacinia, segment I shorter than segment II. Labium ( Fig. 9 ) with paraglossae with two nonpectinate blade-like setae (as in Fig. 24 b), palpi with segment II with a thin distomedial projection, segment III twice longer than wide.

Thorax yellowish brown, fore wing pads brownish. Pleurae yellowish brown. Sterna pale yellow. Legs ( Fig. 10 ): coxae and trochanter yellowish brown, femora, tibiae, tarsi and claws yellowish. Tarsal claw ( Fig. 11 ) with 11– 12 denticles. Abdomen segments I–X ( Fig. 1 ) reddish brown. Posterior margin of terga with pointed spines ( Fig. 12 ). Sterna pale yellow. Gills ( Fig. 13 ) whitish, elongated, 1.5 times the length of each tergum, main and a few secondary tracheae pigmented. Paraprocts as in Fig. 14 . Caudal filaments yellowish brown.

Etymology. Auyán-tepui is the name of the tepui where this species was collected.

Diagnosis. Parakari auyanensis n. sp. can be distinguished from the other species of the genus by the following combination of characters: 1) labrum ( Fig. 4 ) dorsally with one subapical seta near midline; 2) left mandible ( Fig. 5 ) with incisors positioned at right angle to mola; 3) prostheca of right mandible bifid apically ( Fig. 6 ); 4) hypopharynx with lingua longer than superlinguae ( Fig. 7 ); 5) maxillary palpi subequal in length to galea-lacinia ( Fig. 8 ); 6) labial palpi with segment II with a thin distomedial projection ( Fig. 9 ); 7) posterior margin of abdominal terga with pointed spines ( Fig. 12 ).

Material. Holotype male nymph: VENEZUELA, Bolívar Province, NP Canaima, Auyán Tepui Plateau, Río Churún near to El Lecho camp; N 5º 49´34.6´´, W 62º 32´27.9´´, 1740 m.a.s.l., Loc. 9; 10/ I/ 2010, T. Derka & M. Svitok cols. Paratypes: 30 nymphs the same locality and collectors. 17 nymphs: head waters of Río Churún, ca. 30 min from El Oso camp, Loc. 8, 9/ I/ 2010, T. Derka & M. Svitok cols. 3 nymphs: stream below Salto Angel, 21.3ºC, 24/ XI/ 2008, T. Derka & M. Svitok cols. 21 nymphs: Río Oso in El Oso camp, N 5º 47´1.4´´, W 62º 32´12.5´´, 1733 m.a.s.l., Loc. 7, 9/ I/ 2010, T. Derka & M. Svitok. 6 nymphs: Quebrada El Peñón in camp El Peñón, Auyán tepui massif, N 5º 44´40.4´´, W 62º 32´29.7´´, 1832 m.a.s.l., Loc. 5, 8/ I/ 2010, T. Derka & M. Svitok cols. Holotype and 20 paratypes are housed at IML; 10 paratypes are housed at MIZA; other paratypes are housed at FNS.

Figures

FIGURES 1 – 3. Nymphs, dorsal habitus. 1, Parakari auyanensis sp. nov. 2, Parakari churiensis sp. nov. 3, Parakari churiensis sp. nov.

FIGURES 4 – 14. Parakari auyanensis sp. nov. 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, leg I; 11, tarsal claw I. 12, posterior margin of tergum IV. 13, gill IV. 14, paraproct.

FIGURES 24 – 30. Parakari churiensis sp. nov. Nymph. 24 a, labium, left d. v., right v. v.; 24 b, paraglossae: two nonpectinate blade-like setae detail. 25, leg I; 26, tarsal claw I. 27, posterior margin of tergum IV. 28, gill IV. 29, paraproct. 30, cercus.