with other valviferan
isopods, the uropods
to the pleotelson,
forming a valvelike covering over the pleopods
ochotensis has a body which
is definitely dorsoventrally flattened and with 7 free pereonites.
The lateral margins of the cephalon
do not have a deep incision. The eyes are lateral.
has 2 free pleonites
plus a pleotelson
(which has a pair of lateral incisions showing the margin of a third
has a definite point on the posteromedian margin. The lataral
of the pleon,
and the posterior margins of the pleon
on either side of the posteromedian point are often concave.
of the maxilliped
has only 4 articles.
Length to 4.2 cm, width to 1.6 cm.
Idotea ochotensis Brandt, 1851
|Idotea ochotensis on 3rd Beach,
Olympic Peninsula, WA
|(Photo by: Dave Cowles,
How to Distinguish from
Idotea aculeata is very similar but the palp
of its maxilliped
has 5 articles
and it is found only from central California south. Idotea
resecata has a concave posterior margin on the pleotelson.
Japan, NE Asia
to San Francisco
At least intertidal and
We found this individual
in an area of mixed boulders and sand, in an area with strong
Sometimes found on drifting seaweed and in brackish water.
and Snook, 1955
General Notes and
Observations: Locations, abundances,
The underside of the same individual as above.
Authors and Editors of Page:
Dave Cowles (2006): Created original page