Form described by Langton, 1991
Diagnosis
Exuviae 1.9-2.4mm long (m=2.1, n=8).
Cephalothorax: Thoracic horn and pearl row absent.
Abdomen: Tergites VI and VII armed with points no more than 5µm in length. Tergite VIII with median points spinulate, about 8µm, obviously longer than those on VII; armament of tergites increasing in strength from III to VIII. Sternite II without spinules; if armed, then with minute points; posterior points of sternites III-VIII not conspicuously enlarged. Segments III-VIII with 4 lateral taeniae.
Anal segment: Anal lobe ratio 1.3-1.8 (m=1.5, n=7). Fringe of anal lobe with 36+1 to 48+1 taeniae (m=43+1, n=8). Apical setae of anal lobes cylindrical, hooked apically.
Form keys out at Page 599: Orthocladiinae 11 Thienemanniella of the Text Key.
Distribution
NW. Europe.
(For more information see module IdentifyIt – file: Orthocladiinae).
Ecological notes
Streams.