Hyrtanella christineae Allen and Edmunds

Jacobus, Luke M. & Sartori, Michel, 2004, Review of the genus Hyrtanella (Ephemeroptera: Ephemerellidae), Zootaxa 785, pp. 1-12 : 3

Hyrtanella christineae Allen and Edmunds

Fig. 9

Diagnosis. Larvae ( Allen & Edmunds 1976: Figs. 1, 5, 6 ) have sharp genal and frontal spines that are upturned; the third segment of the labial palp relatively wide proximally; the mandibular base produced into a lateral protuberance; prominent, bluntly pointed projections on the upper surface of the forefemur; and prominent, paired, bluntly pointed projections on the thoracic and abdominal sterna.

Larval variability. Allen and Edmunds (1976) described H. christineae as having a body length of 6.5–7.5 mm. However, we examined some final instar H. christineae specimens with a body length of up to 9.5 mm. One larva from the Liwagu River, north of Kundassan, has two more dorsal projections on the thorax than described by Allen and Edmunds (1976).

Discussion. The series of paratype larvae that we examined includes early, middle, and late instars.

Material examined. Island of Borneo—MALAYSIA (east), Sabah: Liwagu R, N of Kundassan, 915m elev., S8e, 16–17/VIII/1972, GF& CH Edmunds, two larvae [ PERC]; Liwagu R, Liwagu Cave, SE of Headquarters, 1525m elev., S7e, 14–15/VIII/1972, GF& CH Edmunds, 24 larvae (paratypes) [ PERC]; same data, six larvae [ MZL, PERC]; Silau­Silau Stream, N of Kinabalu NP Headquarters, 1585m elev., S3e, 11/VIII/1972, GF& CH Edmunds, one larva [ PERC].

Figures

FIGURES 1 – 9. Figs 1 – 8. Hyrtanella pascalae, n. sp., larvae: 1. Labrum (left, dorsal view; right, ventral view). 2. Detail of brushlike setae on dorsal surface of labrum. 3. Detail of transverse row of setae on ventral surface of labrum. 4. Hypopharynx (right half). 5. Right mandible. 6. Left mandible. 7. Maxilla. 8. Labium. Fig. 9. Hyrtanella christineae, larva: Detail of labial palp.