Overview

Distribution

Beaufort Sea, North Pacific, Sea of Okhotsk, Yellow Sea, north and temperate Atlantic, North Sea, English Channel, Baltic Sea

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Physical Description

Morphology

Female:
The posterior corners of the last thoracic segment are rounded, the head has an obtuse shape. Surface of the genital and postgenital segments are covered in rows of very small spinules. Abdomen contains 4 segments. A1 do not reach the distal edge of the genital segment. P5 one-segmented, is longer than wide, contains an apical and lateral spines and slender spinules only on the distal inner margin of the segment. The apical spine of P5 bulbous at the base, slightly curved, toothed at the inner and outer edge, twice longer than the segment.

Male:
Abdomen contains 6 segments, lacks spinules on the surface. The 1st exopodal segment of the right P5 with an inner edge spine; the 4th segment with a swollen inner lobe. The fused 2nd and 3rd exopodal segments on the left P5 carry one fine terminal spine and 1 broad truncate spine.

A. bifilosa var. intermedia
Abdominal segments naked in males and females, spine of female P5 bulbous at the base. The 1st exopodal segment of the right P5 in males with 2 inner expansions, the 3rd left segment ends with a spine and a small sppendix with 2 spines at its end.

A. bifilosa var. inermis
Abdominal segments without spines. The 1st exopodal segment of the right P5 in males with 2 inner expansions, the last segment narrowed at base. The external spines on the 2nd exopodal segment on the left P5 are grouped.

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Source: iArcZoo

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Size

Female: 0,67-1,25 mm
Male: 0,67-1,25 mm

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Diagnostic Description

Female: Surface of the genital and postgenital segments are covered in rows of very small spinules.

Male: The 1st exopodal segment of the right P5 with an inner edge spine; the 4th segment with a swollen inner lobe. The fused 2nd and 3rd exopodal segments on the left P5 carry one fine terminal spine and 1 broad truncate spine.

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Ecology

Habitat

Depth range based on 322 specimens in 1 taxon.
Water temperature and chemistry ranges based on 60 samples.

Environmental ranges
  Depth range (m): 0 - 9.5
  Temperature range (°C): -0.912 - 7.144
  Nitrate (umol/L): 0.260 - 5.207
  Salinity (PPS): 6.043 - 30.541
  Oxygen (ml/l): 8.290 - 8.660
  Phosphate (umol/l): 0.162 - 0.742
  Silicate (umol/l): 6.763 - 16.711

Graphical representation

Depth range (m): 0 - 9.5

Temperature range (°C): -0.912 - 7.144

Nitrate (umol/L): 0.260 - 5.207

Salinity (PPS): 6.043 - 30.541

Oxygen (ml/l): 8.290 - 8.660

Phosphate (umol/l): 0.162 - 0.742

Silicate (umol/l): 6.763 - 16.711
 
Note: this information has not been validated. Check this *note*. Your feedback is most welcome.

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Trophic Strategy

Filter feeders, mostly feed on phytoplankton and suspended organic particles

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General Ecology

Ecology

Littoral, coastal, more or less brackish

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Life History and Behavior

Reproduction

Broadcast eggs into the water at a rate of 2.4 eggs/day/female. Mean diameter of eggs is 92 um, eggs non sticky.

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Molecular Biology and Genetics

Molecular Biology

Barcode data: Acartia bifilosa

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


There are 9 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.

CAAGCAGGTAGATTAATTGGAGAC---GATCAGATCTATAATGTGGTTGTTACTGCTCACGCGTTTATTATAATTTTTTTTATAGTTATGCCAATTTTGATTGGGGGTTTTGGGAATTGACTTGTCCCTTTAATA---TTAGGGGCTGCCGATATAGCATTTCCTCGAATAAATAATATAAGTTTTTGACTCTTAATCCCTGCTTTAGTCATATTATTATCTAGCTCTCTTGTAGAAAGAGGGGCTGGAACTGGTTGAACGGTTTACCCTCCTTTATCTAGAAACGTTGCACACGCGGGAGCTTCTGTAGATTTT---GCAATTTTTTCTCTACATTTAGCAGGAGCTAGGTCAATTTTAGGAGCTGTAAATTTTATTTCTACAGTGGGAAATCTGCGATCATTTGGTATAAAATTAGACATAATGCCTTTATTTTCATGAGCAGTGTTAATCACAGCGGTTTTATTATTATTGTCTTTACCAGTTTTAGCTGGG---GCTATTACGATATTATTAACCGATCGAAATTTAAATTCTTCTTTTTATGATGTTAGAGGGGGGGGGGATCCTATCCTTTATCAACACTTATTTTGATTTTTTGGACATCCTGAAGTTTATATCTTAATTTTACCCGGGTTCGGTCTTATCTCTCATATTGTTTCTCAAGAAAGAGGCAAAAGA---GAGACATTTGGTATATTAGGAATAGTGTATGCAATAATATCTATTGGCTTATTAGGGTTTGTTGTTTGAGCACACCACATATTTACAGTAGGTATAGATGCTGACACTCGTGCGTATTTTACTTCTGCAACCATAATCATTGCAGTTCCTACAGGAATTAAAGTATTTAGGTGGTTAGGG---ACCCTTCATGGAGCC---CGTCTATACTATTCTCCCTCAATACTGTGGTATTTAGGCTTTATTTTT
-- end --

Download FASTA File

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Source: Barcode of Life Data Systems (BOLD)

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Statistics of barcoding coverage: Acartia bifilosa

Barcode of Life Data Systems (BOLDS) Stats
Public Records: 9
Specimens with Barcodes: 9
Species With Barcodes: 1
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Source: Barcode of Life Data Systems (BOLD)

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