Rheotanytarsus pe3

new form

Diagnosis (material leg. H. Laville.)
Exuviae 4.2-4.7mm long (m=4.4mm, n=7).
Cephalothorax: Frontal apotome smooth. Thoracic horn 440-540µm long (m=485.7µm, n=7), with setulae (about 8µm long) distally (134h.jpg); ThR 11.5-13.5 (n=7). Pearl row absent.
Abdomen: Tergites II-VI with well-developed anterior paired point patches. On tergites II and III the point patches are circular, longitudinally oval or, at most, a little broader than long, transversely broad oval. The point patches are golden to golden brown; the shagreen on tergites II-VI may be absent but when well-developed it is restricted to lateral extensions of the anterior point patches (134i.jpg) and on V and VI it spreads posteriorly to about half the tergite length; the points in the posterior patches in front of the hook row on tergite II are strong and numerous. The postero-lateral corner of segment VIII bears a simple, cleft or toothed spur, or three spurs, of which the outermost is the strongest and bent as a hook. Lateral taeniae of segments IV-VIII: 1,3,4,4,4.
Anal segment: Fringe of anal lobe with 24-29 taeniae (m=26.7, n=7).

Form keys out at Page 405: Tanytarsini 48 Rheotanytarsus of the Text Key.

(For more information see module IdentifyIt – file: Chironominae).

Ecological notes
Mediterranean streams.