new form
Diagnosis (n=1)
Exuviae 4.3mm long.
Cephalothorax: Cephalic tubercles rounded with short conical apex; frontal setae 115µm long. Antennal sheath base without a swelling. Thoracic horn absent? Posterior thoracic mound well-developed. Wing sheaths rounded apically, pearl row absent.
Abdomen: Hooks of hook row II 101. Tergites II-VI each with an anterior pair of point patches; ArR II-VI 0.5 : 0.9 : 1.0 : 1.0 : 0.57. Tergite II smooth except for the anterior point patches and a few small points in their vicinity. Tergite III with points only. Tergites IV and V with the armament arranged in longitudinal bands. Armament tergite IV strong, 70µm long. Comb of segment VIII 50µm wide; with 7/5 marginal teeth. Lateral taeniae of segments V-VIII: 2,2,4,5.
Anal segment: Anal lobe ratio 1.33. Fringe of anal lobe with 30/34 taeniae, forming a complete series.
Note: Very similar to Tanytarsus curticornis with which the specimen was found, but larger, with the precorneal setae taeniate and set on a bulbous mound, the comb of segment VIII a transverse pad with the marginal teeth of similar size, (in curticornis the comb is obliquely set on the segment corner, the teeth increasing in size outwards), and the frontal apotome weakly granulate. In this unique specimen no trace of thoracic horn can be detected on either side.
Form keys out at Page 411: Tanytarsini 53 Cladotanytarsus of the Text Key.
Distribution
Britain.
(For more information see module IdentifyIt – file: Chironominae).
Ecological notes
Loch Ard, Scotland.