Form described by Langton, 1991
Diagnosis
Exuviae large, 5.2-6.1mm long (n=4).
Cephalothorax: Cephalic tubercles absent; frontal setae on praefrons, 75µm long (n=1). Thoracic horn 70-130µm long; ThR 1.8-4.8 (n=3) (089i.jpg). Thorax granulate, especially anteriorly.
Abdomen: Length hook row II 0.43-0.48x width tergite II (n=4); hooks 87-93. Pedes spurii B present on segments II and III, not conspicuous. Median point band of tergite III transverse and narrow, situated in the third quarter of the segment (089j.jpg). Point patches absent on tergites VII and VIII. Segment VIII with 4 lateral setae, the third and fourth smaller than the first and second.
Anal segment: Anal lobe ratio 1.5-1.6 (n=4). Anal lobes without fringe. Anal macrosetae more or less equally strong, 0.24-0.39x lobe length (n=4).
Form keys out at Page 927: Orthocladiinae 338 Cricotopus of the Text Key.
Distribution
England.
(For more information see module IdentifyIt – file: Orthocladiinae).
Ecological notes
Rivers.