Image Crown copyright - Close up of Diastylis rathkei. Image width ca XX cm.
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Diastylis rathkei is not listed under any importance categories.
|Phylum||Arthropoda||Arthropods, joint-legged animals, e.g. insects, crustaceans & spiders|
|Class||Malacostraca||Crabs, lobsters, sand hoppers and sea slaters|
|Recorded Distribution in Britain and Ireland||Recorded from the Firth of Forth, south to Flamborough Head, the Wash, Harwich, Whitstable, the Severn estuary, Menai Straits, Cumberland, the Solway Firth and Belfast in Northern Ireland.|
|Habitat information||Found burrowing in fine muddy sand on the continental shelf down to depths of 200 m. Fairly common.|
|Description||A small tadpole shaped cumacean, up to 22 mm long but usually smaller. The carapace is a large, broad, shield-like structure covering the head and part of the thorax. The carapace is produced into lateral folds that enclose the anterior appendages of the animal. On the most forward part of the carapace is a projection called a pseudorostrum formed by two adjioning points (the pseudorastal lobes). The pseudorostrum is horizontal. The females carapace has a double row of forward pointing denticles on the sides. A males carapace does not have denticles except near the carinae. There is a single small eye present behind the pseudorostrum. Behind the carapace there are five thoracic segments. There are three pairs of leg like structures on the rear of the thoracic region. The abdomen consists of six cylindrical segments (pleonites). Attached to the last pleonite is a long pointed strucutre called a telson, with 10-15 or sometimes more pairs of lateral spines. The telson is longer than the two structures on each side. These three long structures attatched to the last segment forming a fork like tail.|
|Additional information||Feeds on micro-organisms and organic matter from the bottom deposit. Represented in north west Europe by subspecies typica.|
This review can be cited as follows:
Tracy Heath 2005. Diastylis rathkei. A cumacean. Marine Life Information Network: Biology and Sensitivity Key Information Sub-programme [on-line]. Plymouth: Marine Biological Association of the United Kingdom. [cited 21/05/2013]. Available from: <http://www.marlin.ac.uk/speciesinformation.php?speciesID=3155>