Overview

Comprehensive Description

Description

 Acrocnida brachiata displays the characteristic brittle star body plan with a flat central disc and five distinctly demarcated thin arms. As a member of the order Ophiurida, its arms are usually moved horizontally and the discs and arms are covered with scales. The circular disc can reach 12 mm in diameter and it has very long, thin and flexible arms. Like similar species, it has only one outer mouth papilla, clearly detached from the infradental papillae. It can be differentiated by the presence of two tentacle scales, ventral scales and radial shields with a transverse furrow. It is brown-grey in colour.Acrocnida brachiata is well known to bury itself in sand with only the distal parts of the arms sticking out but is also often associated with Echinocardium cordatum.
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Description

A medium-sized brittle star with very long arms which lives buried in sand. The dorsal and ventral surfaces of the disc are covered in scales. Those of the ventral surface and the edge of the disc bear small tubercles. There are 8-10 short conical arm spines and 2 tentacle scales. Disc to 13mm, arms 15x disc diameter. Larger and coarser than other Amphiura species, none of which have tubercles on their disc scales. Amphiura chiajei is most similar but never has more than six arm spines and has smooth ventral and marginal disc scales.
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Source: Encyclopedia of Marine Life of Britain and Ireland

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Distribution

South and west coasts of the British Isles, probably also on North Sea coasts.
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Source: Encyclopedia of Marine Life of Britain and Ireland

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Ecology

Habitat

Depth range based on 360 specimens in 1 taxon.
Water temperature and chemistry ranges based on 277 samples.

Environmental ranges
  Depth range (m): 0 - 72
  Temperature range (°C): 7.254 - 12.348
  Nitrate (umol/L): 2.631 - 12.040
  Salinity (PPS): 32.851 - 35.363
  Oxygen (ml/l): 6.095 - 6.605
  Phosphate (umol/l): 0.351 - 0.653
  Silicate (umol/l): 2.122 - 7.673

Graphical representation

Depth range (m): 0 - 72

Temperature range (°C): 7.254 - 12.348

Nitrate (umol/L): 2.631 - 12.040

Salinity (PPS): 32.851 - 35.363

Oxygen (ml/l): 6.095 - 6.605

Phosphate (umol/l): 0.351 - 0.653

Silicate (umol/l): 2.122 - 7.673
 
Note: this information has not been validated. Check this *note*. Your feedback is most welcome.

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 Acrocnida brachiata is a littoral and sublittoral benthic species usually found buried in fine sand down to a depth of 40 m.
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This brittle star burrows in clean sand from low water mark to 40m, commoner in shallow water. Often associated with Echinocardium cordatum.
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Source: Encyclopedia of Marine Life of Britain and Ireland

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Molecular Biology and Genetics

Molecular Biology

Barcode data: Acrocnida brachiata

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


There are 350 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.

GTT---------------------------------------------------------------------------------------------------------------------------------TTCCCGCGGATGAACAATATGAGCTTCTGATTAATCCCCCCCTCTTTTATGCTTCTGATGACCTCCGCCGGAACAGAGAGAGGAGCTGGAACAGGTTGAACTGTCTACCCGCCTTTATCGGGGCCCACGGCCCATAGAGGAGCGTCAGTAGACCTCGTCATTTTCTCCCTACATCTAGCCGGAGCCTCCTCAATTATGGCCTCAATTAACTTTATCACCACAATTATTAACATGCGAAGCTCTGGTATGACAATGGACCGGACACCCCTATTCGTATGATCAATCTTACTAACCTCAATTCTTCTCCTTCTATCCTTACCAGTTCTAGCTGGAGCCATAACAATGTTATTGACAGACCGGAAAATTAAAACCAGGTTCTTTGACCCCGAAGGGGGAGGAGACCCCATACTTTACCAACATCTATTTTGATTCTTCGGCCACCCCGAAGTTTACATCTTGATACTTCCAGGGTTCGGGATTATCTCACATGTTGTCGCGTCTCGAACAGGAAAGCAACAGCCCTTCGGCTACCTAGGAATGGTCTATGCTATGGTATCCATAGGAATACTTGGATTTATCGTATGAGCACAC
-- end --

Download FASTA File

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Source: Barcode of Life Data Systems (BOLD)

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Statistics of barcoding coverage: Acrocnida brachiata

Barcode of Life Data Systems (BOLDS) Stats
Public Records: 350
Specimens with Barcodes: 350
Species With Barcodes: 1
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Source: Barcode of Life Data Systems (BOLD)

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