Overview

Comprehensive Description

Description

Body clear with a whitish tint

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Distribution

North Pacific and sub-Arctic Seas. In the north goes as far as the southern Chukchi. For Kosobokova & Hopcroft (2010) this species is an Pacific expatriate in Arctic waters.

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Physical Description

Morphology

Female:
The back is strongly arched from side view, the greatest height of the head (from side view) is almost the same as the tip of the head, so that it forms practically a straight angle. The posterior corners of the last thoracic segment with small sharp points, which are visible both from dorsal and side view. Abdomen almost 2 times shorter than the cephalothorax. The genital segment is approximately the same length as the next 2 segments combined. The anal segment is somewhat shorter than the caudal rami. P5 three-segmented, the distal segment carries 3 cheatae of practically equal length. This segment and also the 2nd segment each carries a long spine on its outer edge.

Male:
The distal segment of the right P5 is larger than the left and does not narrow distally. The left P5 with 2 large spines on the inner edge. The right leg is 4-segmented.

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Size

Female: 2,40-3,45 mm
Male: 1,65-2,60 mm

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Diagnostic Description

The greatest height of the head (from side view) is almost the same as the tip of the head, so that it forms practically a straight angle. P5 three-segmented, the chaetae of the distal segment of P5 of the same length.
The caudal rami in males are longer than the anal segment; the left P5 contains 2 inner spines.

According to Mazzocchi & al. (1995) the systematic literature is contradictory and insufficient to clearly distinguish between M. pacifica and M. lucens.

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Ecology

Habitat

Known from seamounts and knolls
  • Stocks, K. 2009. Seamounts Online: an online information system for seamount biology. Version 2009-1. World Wide Web electronic publication.
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Source: World Register of Marine Species

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Depth range based on 433 specimens in 1 taxon.
Water temperature and chemistry ranges based on 395 samples.

Environmental ranges
  Depth range (m): 0 - 200
  Temperature range (°C): -1.651 - 11.253
  Nitrate (umol/L): 0.644 - 36.421
  Salinity (PPS): 30.438 - 33.659
  Oxygen (ml/l): 3.375 - 8.875
  Phosphate (umol/l): 0.658 - 2.886
  Silicate (umol/l): 10.538 - 87.671

Graphical representation

Depth range (m): 0 - 200

Temperature range (°C): -1.651 - 11.253

Nitrate (umol/L): 0.644 - 36.421

Salinity (PPS): 30.438 - 33.659

Oxygen (ml/l): 3.375 - 8.875

Phosphate (umol/l): 0.658 - 2.886

Silicate (umol/l): 10.538 - 87.671
 
Note: this information has not been validated. Check this *note*. Your feedback is most welcome.

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Oceanic, epi- to bathypelagic species.

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Molecular Biology and Genetics

Molecular Biology

Barcode data: Metridia pacifica

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


There are 4 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.

ACATTATATATGGTAGCAGGGGCATGAAGAGGGATGGTGGGCACAGGCTTA---AGGGTTTTAATTCGCCTAGAATTAGGCCAGCCAGGATCTTTAATTGGGGAC---GATCAGATTTATAATGTTGTAGTGACAGCTCATGCTTTTATTATAATTTTTTTTATAGTTATGCCTATTTTAATTGGGGGATTTGGAAACTGGCTAGTGCCCTTAATA---CTAGGGGCTGCGGATATGGCTTTCCCCCGGCTGAATAACATAAGGTTTTGATTTTTAGTACCTGCCTTAGTACTCTTATTAACGAGGGCGCTAGTGGAAAGAGGGGCCGGTACTGGGTGAACTGTCTACCCCCCCCTGGCAAGGAATGTGGCGCATGCCGGGAGCTCTGTAGACTTC---GCCATTTTTTCGCTTCATTTGGCAGGGGTCTCTTCAATCTTAGGGGCAATTAATTTTATTAGAACCCTGGGTAATCTCCGGGTGTTTGGAATATTCTTAGACCGGATGCCTTTGTTCGCATGAGCTGTCTTAATCACAACTATTTTACTACTTCTTTCCCTTCCTGTTTTAGCCGGG---GCTATTACAATGCTTTTGACAGATCGTAACTTAAACACCACCTTCTATGACGTAGGAGGGGGAGGGGACCCTATT
-- end --

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

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Statistics of barcoding coverage: Metridia pacifica

Barcode of Life Data Systems (BOLDS) Stats
Public Records: 4
Specimens with Barcodes: 4
Species With Barcodes: 1
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© Barcode of Life Data Systems

Source: Barcode of Life Data Systems (BOLD)

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