Alpenstrudelwurm

Alpenstrudelwurm
	Alpine vortex worm ( Crenobia alpina )
Systematics
Class :	Vortex worms (Turbellaria)
Order :	Seriata
Subordination :	Tricladida
Family :	Planariidae
Genre :	Crenobia
Type :	Alpenstrudelwurm
Scientific name
	Crenobia alpina
	Dana , 1766

The alpine strudel worm ( Crenobia alpina ), also known as the alpine planarie , is a species of strudel worm up to 1.5 cm long . Its distribution area covers large parts of Europe and Siberia. A Nordic subspecies Crenobia alpina septentrionalis and an alpine subspecies Crenobia alpina meridionalis are distinguished.

features

The alpine vortex worm is a comparatively dark and slender planaria with paired eyes, relatively close together and relatively far from the front end, as well as paired, spindle-shaped, actively deployable tentacles . The arrangement of the eyes is considered a species feature. The vortex worm is common in unclouded upper reaches of mountain streams with relatively high flow speeds. The carnivorous species mainly prey on river fleas . It can show a generation change with asexual reproduction in summer and sexual reproduction of the hermaphrodites in winter as well as one of the two variants as the main reproduction technique. Sexual reproduction predominates in the German highlands and south of it, whereas asexual reproduction is prevalent in more northern populations. This vortex worm dies at temperatures around 15 ° C and warmer, in the case of the Nordic subspecies even below. He also stays away from acidic environments. Among other things, it serves as food for stonefly larvae .

Saprobic index

The saprobic index for this species is 1.0.

swell

↑ Crenobia alpina ( Memento of October 7, 2010 in the Internet Archive )
↑ Strudelworms ( Memento of April 10, 2009 in the Internet Archive )
↑ Urania Tierreich, Urania-Verlag 1993, Volume "Invertebrates 1", p. 250
↑ Grzimeks Tierleben, Kindler Verlag 1971, Volume 1 " Niedere Tiere ", pp. 281, 287
↑ Meyer, Detlef .: Macroscopic biological field methods for assessing the water quality of rivers: with lists of species for beginning and experienced investigators and detailed descriptions and images of the indicator organisms . 4th, unchanged. BUND, Hannover 1990, ISBN 3-9800871-4-X .

[1] Crenobia alpina ( Memento of October 7, 2010 in the Internet Archive )

[2] Strudelworms ( Memento of April 10, 2009 in the Internet Archive )

[3] Urania Tierreich, Urania-Verlag 1993, Volume "Invertebrates 1", p. 250

[4] Grzimeks Tierleben, Kindler Verlag 1971, Volume 1 " Niedere Tiere ", pp. 281, 287

[5] Meyer, Detlef .: Macroscopic biological field methods for assessing the water quality of rivers: with lists of species for beginning and experienced investigators and detailed descriptions and images of the indicator organisms . 4th, unchanged. BUND, Hannover 1990, ISBN 3-9800871-4-X .