Orbinia sertulata
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Orbinia sertulata |
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| ( Savigny , 1820) |
Orbinia sertulata is a marine annelid worm from the genus Orbinia within the multi - bristle family of Orbiniidae .
features
Orbinia sertulata has a cylindrical body up to 30 cm long and flattened at the front with up to 400 segments . The triangular prostomium is slightly longer than it is wide and has no eyes. The thorax comprises 22 to 24 bristle-bearing segments. Each of the notopodia seated on these has a bundle of capillary-like bristles and behind it a single lobe and an acicula, while the associated neuropodia are designed as tori with smooth or toothed thorns and capillary-like bristles. On the first five bristle-bearing segments, the neuropodia have a semicircular lamella behind the bristles and then 10 to 15 conical papillae at the corresponding point up to the 27th to 31st segment. Papillae sit under the parapodia on the ventral side of segments 17 to 20 and 27 to 35, but there are no spines. Each notopodium on the segments of the abdomen has capillary-like as well as forked bristles and behind it a single lobe and aciculae, the associated bilobed neuropodium has one or two aciculae, a few capillary-like bristles and a small ventral cirrus . The interramal cirrus is about as long as the neuropodium. Long, lanceolate and ciliate gills are located on each segment from the fifth bristle-bearing segment . The pygidium carries two long cirrus. The thorax is dark red, the abdomen grayish-brown.
Distribution, habitat and way of life
Orbinia sertulata is widespread in the Arctic , the northeastern Atlantic Ocean , the Mediterranean Sea and from the North Sea to the Bay of Kiel . Here it can be found on sand or mud below the intertidal zone.
There are no publications on the way of life and the development cycle of Orbinia sertulata . Other representatives of the Orbiniidae eat substrate or graze bacteria directly from the substrate and develop through free-swimming larvae.
literature
- PJ Hayward, JS Ryland: Handbook of the Marine Fauna of North-West Europe. Oxford University Press, Oxford 1995. p. 213.
Web links
- MJ de Kluijver et al .: Orbinia sertulata (Savigny, 1820). Macrobenthos of the North Sea - Polychaeta, Marine Species Identification Portal