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Distribution in scandinavian waters
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Maximum length: 8 mm.
Appearance: The body is laterally compressed. The head has two
pairs of antennae and distinctive black eyes. The abdomen comprises
seven segments with a pair of legs on each and brushes on the underside
of the first four segments. On the last pair of legs on the abdomens
fourth segment , a large rounded brush furnished plate is situated.
Only the first three segments of the posterior have side plates. Monoporeia
affinis has a protrusion on the upper side of the posterior. Yellowish
to pure white in colour.
Depth: From the surface to approx. 80m.
Environment: Soft bottoms.
Misc: The closely related species Pontoporeia femorata
is found in Scandinavian waters, but not in brackish waters such as
the Gulf of Bothnia and surprisingly, it is not found in the northern
areas of the Skagerrak. Pontoporeia femorata distinguishes itself
in comparison with the Monoporeia affinis by having light red
eyes and a splitted protrusion on top of its posterior. It has a light
yellow colour and can be up to 9mm long in Swedish waters.
Classification: Monoporeia affinis is a member of the
amphipod group, which is a crustacean under the arthropods.
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