Larsia atrocincta

Author: (Goetghebuer, 1942)

Diagnosis (n=2)
Exuviae 4.1, 4.8mm long.
Cephalothorax: Thoracic horn 265µm long, elongate, broad, curved near base, toothed and with its plastron plate offset apically, surrounded by a clear rim; ThR 3.8, 4.4. Plastron plate maximum diameter 60µm. Respiratory atrium thin walled and much diverticulated, atrium alveolar, with a narrow median channel (019h.jpg). Thorax smooth. Thorax comb of 9-13 strong teeth.
Abdomen: Tergite I with a median mark. Abdominal armament of minute points arranged in short transverse slightly curved rows. Abdominal tergites with a broad antero-median dark patch extending to the lateral adhesion marks, and an antero-lateral dark patch on the pleura; posteriorly and postero-laterally colourless (019i.jpg). Lateral taeniae on segments VII-VIII 4,5; anterior lateral taenia of segment VII at 0.57, 0.6 of length segment VII.
Anal segment: Anal lobes with small teeth externally only. Anal lobe ratio 3.0, 3.5. Insertion of anterior anal taenia at 0.30, 0.35 of lobe length.
(Linked adult male: Langton and Pinder, 2003a)

Species keys out at Page 78: Tanypodinae 64 Larsia of the Text Key.

Widespread in Europe and NW Africa.
(For more information see module IdentifyIt – file: Other subfamilies).

Ecological notes
Lakes in the north; rivers and streams in the south.