Cryptonympha, Lugo-Ortiz & McCafferty, 1998

Derka, Tomáš & Nieto, Carolina, 2018, A new species of Cryptonympha Lugo-Ortiz & McCafferty (Ephemeroptera, Baetidae) from Cerro Duida (Venezuela), Zootaxa 4377 (4), pp. 587-592 : 591

Key to the nymphs of Cryptonympha

1 Posterior margin of terga with rounded spines ( Fig. 16 ); gills II–VII long, 2.5 times the length of each tergum ( Figs. 6–7 ), segment II of maxillary palpi ( Fig. 12 ) at least two times the length of segment I, gill I nearly half length of gill IV ........................... ........................................................................................................................................................................... C. tracheata sp. nov.

- Posterior margin of terga with pointed spines, gills II–VII shorter, 1.5 times the length of each tergum, segment II of maxillary palpi shorter than two times the length of segment I, gill I longer or only slightly shorter than gill IV........................................... 2

2 Tarsal claw with single row of denticles, prosteca of left mandible with a long, robust and pilose seta........................... C. copiosa

- Tarsal claw with two rows of denticles, prosteca of left mandible without a long, robust and pilose seta....................................... 3

3 Head capsula exteriorly from antennae with two small anterolateral protuberances, gill I large, longer than gill IV, hind wings pads rudimentary ........................................................................................................................................................... C. genevievae

- Head capsula exteriorly from antennae without two small anterolateral protuberances, gill I small, slightly shorter than gill IV, hind wings pads absent ....................................................................................................................................................... C. dasilvai

Figures

FIGURES8–19.Cryptonympha tracheatasp.n.Nymph.8,labrum,left d.v., rightv.v.; 9, leftmandible;10, right mandiblewithdetail of prostheca; 11, hypopharynx v.v.; 12, maxilla v.v.; 13, labium, left d.v., right v.v.; 14, fore leg; 15, fore tarsal claw; 16, posterior margin of tergumIV; 17, gillI; 18, gill IV;19, paraproct;scale = 0.24 mm.

FIGURES 1–7. 1–2, map of study site location; 3–5, photographs of study site. Cryptonympha tracheata sp. n. Nymph. 6, dorsal habitus; 7, lateralview.