Tvetenia bavarica

Author: (Goetghebuer, 1934)

Exuviae 2.5-2.8mm long (n=3) (053-1.jpg). Exuviae colourless.
Cephalothorax: Thoracic horn 265-300µm long (n=3), broadest at base, tapered to apex, more strongly tapered over the basal half (053b.jpg); length base 0.23-0.27x horn length (n=3); ThR (base) 2.3, 2.4 (n=2). Pearl row consisting of a band of very small pointed tubercles (053c.jpg).
Abdomen: Hook rows on tergites broken medially (053d.jpg); hooks III 3/3-6/6, IV 3/4-7/8, V 2/4-6/8 (n=4). Abdominal segments II-V dorsally nearly covered with small points except for the adhesion marks; VI-VIII progressively less extensively armed (no anterior transverse band of strong points). Segment VIII with all lateral setae very thin, short, inconspicuous.
Anal segment: Anal lobes without fringe. Anal macrosetae conspicuous, an additional fourth seta internally, well-separated from the other three (053e.jpg).
(Linked adult male: Langton and Pinder, 2003a)

Species keys out at Page 710: Orthocladiinae 122 Tvetenia of the Text Key.

Holarctic species: widespread in Europe, circum-Mediterranean.
(For more information see module IdentifyIt – file: Orthocladiinae).

Ecological notes
Montane streams and pools; larvae in moss.