Thienemannia gracilis

Author: Kieffer, 1909

Diagnosis (n=2)
Exuviae 1.8, 2.0mm long (062-1.jpg).
Cephalothorax: Frontal setae present, small. Thoracic horn absent.
Abdomen: Tergites without longitudinal ridges posteriorly. Tergites II-VII or II-VIII each with a posterior transverse row of teeth which may be flattened and contiguous, without a similar anterior transverse row (062b.jpg). Posterior transverse row of tergite II restricted to a few teeth medially. Teeth of the posterior transverse row elongate and separate from each other. Tergites VI-VIII with median point patches, more or less circular, best developed on segment VIII.
Anal segment: Anal lobe ratio 1.9. Anal lobes flat, without strong teeth along the lateral margins and not extended posteriorly into a downwardly curved point. Anal lobes without taeniate fringe; with three apical setae, 0.56, 0.45x lobe length (062c.jpg).
(Linked adult male: Langton and Pinder, 2003a)

Species keys out at Page 778: Orthocladiinae 190 Thienemannia of the Text Key.

Widespread in Europe.
(For more information see module IdentifyIt – file: Orthocladiinae).

Ecological notes
Montane streams; larvae in wet moss.