Orbinia norvegica
| Orbinia norvegica | ||||||||||||
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| Scientific name | ||||||||||||
| Orbinia norvegica | ||||||||||||
| ( Sars , 1835) |
Orbinia norvegica is a marine annelid worm from the genus Orbinia within the multi - bristle family of Orbiniidae .
features
Orbinia norvegica has a cylindrical body up to 5.8 cm long with up to 75 segments . The small, cylindrical prostomium has no eyes. The thorax comprises 15 to 17 bristle-bearing segments. Each of the notopodia sitting on them has capillary-like bristles and behind it a simple, cirrus-shaped or forked lobe, while several rows of strong bristles with hoods and a row of capillary-like bristles and behind them 7 to 17 pointed papillae are located on the associated neuropodia . There are no papillae under the parapodia . Each notopodium on the segments of the abdomen has tongue-shaped lobes with 4 to 5 aciculae and capillary-like and forked bristles, while the associated bilobed neuropodium has slender, quite long, bilobed lobes with an acicula and capillary-like bristles. The ventral cirrus is small and triangular, while an interramal cirrus is absent. On each segment from the fifth to the sixth bristle-bearing segment there are large lanceolate gills . A pygidium has not been observed. The animal is reddish to yellowish.
Distribution, habitat and way of life
Orbinia norvegica is found in the North Sea , the Skagerrak and the Kattegat , but it is probably cosmopolitan with the exception of the Arctic and Antarctic. Here it can be found on mud below the intertidal zone to a depth of 2900 m.
There are no publications on the way of life and the development cycle of Orbinia norvegica . Other representatives of the Orbiniidae are sediment eater , which develop via freely swimming larvae.
literature
- Marian H. Pettibone: Marine Polychaete Worms of the New England Region. Smithsonian Institution, Washington DC 1963. p. 283.
Web links
- MJ de Kluijver et al .: Orbinia norvegica (M. Sars, 1872). Macrobenthos of the North Sea - Polychaeta, Marine Species Identification Portal