Fingered burdock holothuria
| Fingered burdock holothuria | ||||||||||||
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Fingered burdock holothuria ( Oestergrenia digitata ), in the middle an endoparasitic snail tube ( Entoconcha mirabilis ). Brehm's Thierleben , 1893 |
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| Scientific name | ||||||||||||
| Oestergrenia digitata | ||||||||||||
| ( Montagu , 1815) |
The Fingered Klettenholothurie ( Oestergrenia digitata ) is a in the Mediterranean , the Adriatic Sea and north-eastern part of the Atlantic Ocean spread Seegurkenart the family of synaptidae (Synaptidae). Synonyms for fingered burdock holothuria are Holothuria digitata , Synapta digitata and Labidoplax digitata .
Appearance and anatomy
The fingered burdock holothuria has a worm-shaped, long and slender, transparent red or brown, darker back, up to 30 cm long body with twelve fingered mouth sensors (tentacles) and without suction feet. On each tentacle there are 2 pairs of lateral fingers and sometimes a rudimentary end finger. On the inside of the little fingers sit 2 longitudinal rows of small, round sensory organs. The water vascular system is limited to the supplies the sensors mouth as with other synaptidae on the mouth ring. The lime elements sitting in the skin are designed as approximately 0.3 mm long anchors with sawn arms, sometimes larger, unsawed anchors and approximately 0.3 mm long anchor plates with a handle up to 35 µm long and four central holes through which the holothuria can "attach". The limestone ring consists of 12 radially perforated parts.
distribution
The fingered burdock holothuria is widespread in the Mediterranean , Adriatic Sea and northeastern part of the Atlantic Ocean on all western coasts of the British Isles , in the Irish Sea and on the Shetland Islands , in the English Channel on the coast of Devon and Cornwall and on the French Atlantic coast, however, it is absent on the French side of the English Channel and in the southern North Sea. It can be found at sea depths of up to about 70 m.
Habitat and way of life
The fingered burdock holothuria digs through pure or muddy sand and in this way builds caves from which it sticks out its mouth feelers or part of the body in order to collect food particles from detritus from the substrate surface.
Development cycle
The fingered burdock holothuria is separate sex. The gametes are released into the open sea water, where fertilization takes place. Free-swimming Auricularia larvae develop from the zygotes and later metamorphose into crawling sea cucumbers .
Parasites
In the 19th century, a parasitic snail tube ( Entoconcha mirabilis ) was found in every hundredth fingered burdock holothuria in an investigation in the bay of Muggia near Trieste (Austrian Empire ).
literature
- PJ Hayward, JS Ryland: Handbook of the Marine Fauna of North-West Europe. Oxford University Press, Oxford 2017. p. 686.
- Bernard E. Picton: A Field Guide to the Shallow-water Echinoderms of the British Isles. Marine Conservation Society. Immel Publishing Ltd., London 1993. Labidoplax digitata (Montagu, 1815), p. 84.
- JD Fish, S. Fish: A Student's Guide to the Seashore. Cambridge University Press, 2011. Labidoplax digitata (Montagu), p. 426.
- Alfred Brehm : Brehm's Thierleben . General customer of the animal kingdom. Great edition . Volume 10. Bibliographical Institute, Leipzig / Vienna 1893. Klettenholothurie . Pp. 509-412 ; Holothuria snail tube . Pp. 406-410 .
Web links
- Echinodermata, Apodida, Synaptidae: Labidoplax digitata (Montagu, 1815)
- MJ de Kluijver, SS Ingalsuo: Labidoplax digitata (Montagu, 1815). Macrobenthos of the North Sea - Echinodermata, Marine Species Identification Portal
- J. Bilewitch: Oestergrenia digitata (Montagu, 1815). In: H. Tyler-Walters, K. Hiscock (Eds.): Marine Life Information Network, Biology and Sensitivity Key Information Reviews. Marine Biological Association of the United Kingdom, Plymouth 2009.