Cheleocloeon sigiense, Gillies, 2001

Gillies, M. T., 2001, New species of Baetidae (Ephemeroptera) from the Upper River Sigi, Usambara, Tanzania, Journal of Natural History 35 (1), pp. 23-32 : 23-24

Cheleocloeon sigiense n. sp.

(®gures 1 ±11)

Dabulamanzia sp. n., Gillies, 1998: 53.

Male imago (in life). Eyes chocolate brown; thorax pitch brown, fore femora tan, rest of legs clear; abdominal terga I±V greyish white, lateral margins and terga VI±X brown, a median dark red spot on I, II and V±VIII.

(In spirit). Turbinate eyes well separated, reddish brown; thorax dark brown, fore femora pale brown, rest of legs white; stigma of fore wing with four or ®ve slanting cross-veins, hind wing (®gure 2) narrow and blunt-tipped, with two veins and recurved spur; abdominal terga white, VI±X tinged with brown, venter white,

² Deceased. sternum IX and forceps limbs (®gure 3) pale brown; cerci white. Body 4 mm, fore wing 5 mm, cerci 8 mm.

Female imago (in life). A generally dark brown insect, abdomen with brownish yellow and red markings above, cerci white.

(In spirit). Body pale brown, paler on venter; terga III and VI and along margins darker brown; fore femora pale brown, rest of legs white. Fore wing (®gure 1) as in male, hind wing apparently absent. Body 5 mm, wing 5 mm.

Larva. In life a small dark species. Mouthpart s (®gures 4±8): incisors of mandibles fused, right prostheca a broad scraper, apically ®mbriate, well-developed setal tuft at base, left prostheca without setal tuft, left molar surface terminating medially in two or three large, blunt teeth; apical teeth of galea-lacinia stout, tapered, maxillary palp slender, apparently shorter than galea-lacinia (damaged in available specimens); glossa of labium broad with sub-parallel sides, apical medial process of second segment of palp well developed, rounded; upper surface of labrum without setae except along margin.

Legs (W gures 9, 10). Femora narrow, posterior margin with scattered narrow, spine-like setae; a distinct tibio-patellar seam present on mid and hind tibiae; tarsal claws with three or four coarse teeth in a single row.

Abdomen. Gills (®gure 11) present on I±VII, obovate, small and narrow on I, serrated on antero-apical margin. Spines on posterior tergal margins small and more or less regular. Paraprocts with ®ve or six stout spines. Cerci and terminal ®lament subequal, setose except for last two or three segments.