Overview

Comprehensive Description

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.Feeds on micro-organisms and organic matter from the bottom deposit. Represented in north west Europe by subspecies typica.
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Distribution

In the 1976-1986 period Diastylis rathkei was mainly found in the eastern coastal zone. In this area the species reached a high distribution frequency and its maximum densities (70 ind./m2). In the 1994-2001 period the species was also found outside this area near the Hinder Banks, but its distribution frequency decreased and its maximum density dropped to 30 ind./m2.
  • Degraer S., J. Wittoeck, W. Appeltans, K. Cooreman, T. Deprez, H. Hillewaert, K. Hostens, J. Mees, E. Vanden Berghe & M. Vincx (2006). The macrobenthos atlas of the Belgian part of the North Sea. Belgian Science Policy. D/2005/1191/3. ISBN 90-810081-6-1. 164 pp.
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Source: World Register of Marine Species

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Physical Description

Diagnostic Description

Description

Cumaceans with a thickened head-thorax part and a slender abdomen. Up to 9 mm long.
  • Degraer S., J. Wittoeck, W. Appeltans, K. Cooreman, T. Deprez, H. Hillewaert, K. Hostens, J. Mees, E. Vanden Berghe & M. Vincx (2006). The macrobenthos atlas of the Belgian part of the North Sea. Belgian Science Policy. D/2005/1191/3. ISBN 90-810081-6-1. 164 pp.
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Source: World Register of Marine Species

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Ecology

Habitat

Diastylis rathkei has a clear preference for fine-grained sediments as the relative occurrence exceeds 60% in sediments with a median grain size of 50-100 µm. Although the species occurs in sediments with both high and low mud contents, D. rathkei reaches a maximum relative occurrence (> 20%) in sediments with a mud content exceeding 20%.
  • Degraer S., J. Wittoeck, W. Appeltans, K. Cooreman, T. Deprez, H. Hillewaert, K. Hostens, J. Mees, E. Vanden Berghe & M. Vincx (2006). The macrobenthos atlas of the Belgian part of the North Sea. Belgian Science Policy. D/2005/1191/3. ISBN 90-810081-6-1. 164 pp.
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© WoRMS for SMEBD

Source: World Register of Marine Species

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Depth range based on 653 specimens in 3 taxa.
Water temperature and chemistry ranges based on 143 samples.

Environmental ranges
  Depth range (m): -24 - 2840
  Temperature range (°C): -1.536 - 12.863
  Nitrate (umol/L): 1.064 - 18.463
  Salinity (PPS): 6.559 - 35.211
  Oxygen (ml/l): 2.113 - 8.662
  Phosphate (umol/l): 0.097 - 1.740
  Silicate (umol/l): 0.981 - 50.947

Graphical representation

Depth range (m): -24 - 2840

Temperature range (°C): -1.536 - 12.863

Nitrate (umol/L): 1.064 - 18.463

Salinity (PPS): 6.559 - 35.211

Oxygen (ml/l): 2.113 - 8.662

Phosphate (umol/l): 0.097 - 1.740

Silicate (umol/l): 0.981 - 50.947
 
Note: this information has not been validated. Check this *note*. Your feedback is most welcome.

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 Found burrowing in fine muddy sand on the continental shelf down to depths of 200 m. Fairly common.
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Molecular Biology and Genetics

Molecular Biology

Statistics of barcoding coverage: Diastylis rathkei

Barcode of Life Data Systems (BOLDS) Stats
Public Records: 2
Specimens with Barcodes: 5
Species With Barcodes: 1
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Source: Barcode of Life Data Systems (BOLD)

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Barcode data: Diastylis rathkei

The following is a representative barcode sequence, the centroid of all available sequences for this species.


There are 2 barcode sequences available from BOLD and GenBank.  Below is a sequence of the barcode region Cytochrome oxidase subunit 1 (COI or COX1) from a member of the species.  See the BOLD taxonomy browser for more complete information about this specimen and other sequences.

TCA------------------------------------------------------------------------------------------------------------------------CCTGATATAGCATTCCCTCGAATAAACAACATGAGATTCTGACTTCTACCTCCTTCCCTGACTTTATTGTTAATTAGAGGTTTAATTGAGAGAGGCGTAGGAACAGGATGAACAGTATACCCCCCATTAGCTGCTGGAATTGCTCATGCTGGAGGAGCAGTAGACCTGGCAATTTTTTCTCTTCATTTAGCTGGGGCTTCCTCAATTTTAGGGGCAGTAAATTTTATTACCACTGTAATTAATATACGAACTGAAGGAATACCTATAGAACGAGTCCCATTATTTGTATGATCTGTTTTAATTACTGTTGTACTTCTACTTCTATCACTACCAGTGCTAGCCGGAGCTATCACAATACTTCTCACAGACCGTAACCTAAATACCTCATTTTTTGACCCTAGAGGTGGAGGAGACCCAATCCTATATCAACATTTATTTTGATTTTTTGGTCACCCTGAAGTATATATTTTAATTCTACCTGCCTTCGGCATAATCTCTCATATTGTGTCACAAGAGTCAGGAAAAAAAGAATCATTCGGAGCTTTAGGTATAATCTATGCTATACTCTCTATTGGATTTCTAGGATTTATTGTTTGAGCTCATCATATATTTACAGTA
-- end --

Download FASTA File
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Source: Barcode of Life Data Systems (BOLD)

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