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Zooplankton of the Arctic. Last indexed May 14, 2013

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Diagnostic Description
Description of Beroe cucumis
Can be distinguished from co-occuring species B. abyssicola by: - more...
Size
Description of Sarsicopia polaris
Female: 0,39 mm Male: 0,35 mm...
Morphology
Description of Sarsicopia polaris
Male: Rostrum produced anteriorly, fused to cephalosome, with paired sencilla at...
Morphology
Description of Sarsicopia
Platicopioida with 16-segmented A1 in males, 18-segmented A1 in females. Exopodite...
Morphology
Description of Pseudhaloptilus eurygnathus
Female: Body oval shaped, stout. Head smoothly rounded in lateral view....
Morphology
Description of Phaennocalanus unispinosus
Female: Body oval shaped, tapers distally. Posterior corners of the last...
Size
Description of Oithona atlantica
Female: 0,60-1,43 mm Male: 0,60-1,00 mm...
Morphology
Description of Oithona atlantica
Female: Rostrum is directed anterioventrally, is visible from dorsal view. Caudal...
Morphology
Description of Monstrillopsis ferrarii
Female: Cephalothorax is up to 61.3% of total body length. Oral...
Diagnostic Description
Description of Monstrillopsis ferrarii
Different from M. dubia by the following features: - Relatively shorter...
Size
Description of Microsetella norvegica
Female: 0,35-0,76 mm Male: 0,30-0,66 mm...
Morphology
Description of Mesaiokeras spitsbergensis
Female: Abdomen about 2.9 times shorter than the cephalothorax. Body relatively...
Diagnostic Description
Description of Mesaiokeras spitsbergensis
Can be distinguished from other species of the genus by: -Markedly...
Morphology
Description of Kirnesius groenlandicus
Female: unknown Male: Rostrum in the form of a well developed...
Size
Description of Hyalopontius typicus
Female: 4,87-5,30 mm Male: 4,60-5,05 mm...
Morphology
Description of Hyalopontius typicus
Female: Posterior lateral corners of the 2nd and 3rd thoracic segments...
Size
Description of Fosshageniella glabra
Female: 0,72-0,74 mm Male: 0,61 mm...
Morphology
Description of Fosshageniella glabra
Female: Body long, compact. Cephalothorax has an oval shape in dorsal...
Morphology
Description of Fosshageniella
The first thoracic segment free, covered by the posterior extension of...
Diagnostic Description
Description of Fosshageniella
enus different from Misophriopsis with the following features: - 19-segmented A1...
Size
Description of Eucalanus hyalinus
Female: 6,17-7,50 mm Male: 4,83-4,92 mm...
Morphology
Description of Eucalanus hyalinus
Female: The front end of the cephalothorax is triangular in shape...
Size
Description of Epicalymma vervoorti
Female: 0,48-0,52 mm Male: 0,42-0,44 mm...
Morphology
Description of Epicalymma vervoorti
Female: Abdomen 1.5 times shorter than the cephalothorax. External genital apparatus...
Size
Description of Epicalymma umbonata
Female: 0,62-0,88 mm Male: 0,64-0,67 mm...
Diagnostic Description
Description of Epicalymma umbonata
Differs from other species by: - Comparatively wider flange on the...
Morphology
Description of Disco minutus
Female: Rostrum large and obtusely rounded. Anal segment less than 2...
Morphology
Description of Calanus hyperboreus
Female: Cephalothorax oval shaped from dorsal view, the front end is...
Morphology
Description of Calanus glacialis
Female: The ventral surface of the genital segment from lateral view...
Size
Description of Acartia danae
Female: 0,90-1,30 mm Male: 0,70-0,90 mm...
Morphology
Description of Acartia danae
Females: Posterior corners of the last thoracic segment with a large...
Size
Description of Acartia bifilosa
Female: 0,67-1,25 mm Male: 0,67-1,25 mm...
Morphology
Description of Acartia bifilosa
Female: The posterior corners of the last thoracic segment are rounded,...
Diagnostic Description
Description of Acartia bifilosa
Female: Surface of the genital and postgenital segments are covered in...
Size
Description of Bradyidius armatus
Female: 1,70-2,70 mm Male: 1,50-2,20 mm...
Morphology
Description of Bradyidius armatus
Female: Cephalothorax about 3-4 times longer than abdomen. Rostral rami strongly...
Diagnostic Description
Description of Bradyidius armatus
Female: Rostrum with divergent rami. First segment of exopodite of A2...
Life Cycle
Description of Calanus finmarchicus
Near England goes through 2 generations a year, in the Barents...
Morphology
Description of Calanus finmarchicus
Female: The ventral surface of the genital segment from lateral view...
Size
Description of Oithona similis
Female: 0,68-1,20 mm Male: 0,50-0,82 mm...
Morphology
Description of Oithona similis
Female: Rostrum is directed down, is only visible from lateral view....
Morphology
Description of Parerythrops obesa
Eyes large, do not protrude far beyond the edge of the...
Nematoscelis megalops G. O. Sars, 1883
Image of Nematoscelis megalops
Meganyctiphanes norvegica (M. Sars, 1857)
Image of Meganyctiphanes norvegica
Morphology
Description of Erythrops serrata
The last abdominal segment is equal in length to the previous...
Morphology
Description of Erythrops abyssorum
The last abdominal segment is equal in length to the previous...
Morphology
Description of Calanus marshallae
Female: The ventral surface of the genital segment from lateral view...
Morphology
Description of Scina pusilla
Pereon is wide near the top and narrows sharply after the...
Morphology
Description of Scina borealis
Body smooth, without ridges; only the head contains low crests which...
Morphology
Description of Neomormonilla polaris
1st abdominal segment with or without P5 represented by 2 pairs...

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