Pandalus tridens Rathbun, 1902
Common name(s): Yellowleg pandalid
|Synonyms: Pandalus montagui tridens|
|Pandalus tridens from the Sea of Okhotsk, NW Pacific.|
|(Photo by: Andrey Gontchar )|
How to Distinguish from Similar Species:P. platyceros has an abdominal segment less than twice as long as wide. P. eous, P. jordani, and P. goniurus don't have the steeply ascending rostrum with the three pointed (trifid) tip. They also have a medial dorsal ridge on abdominal segment 3. This is the only pandalid shrimp in this area which has light bands on its legs but no stripes or spots on the body.
Geographical Range: West side of Bering Sea and Sea of Okhotsk to Channel Islands off Santa Barbara, CA.
Depth Range: 5-1984 m
Habitat: Rocky and muddy bottoms, may be more common on rocky bottoms.
This species was early identified as P. montagui tridens, a Bering Sea variation of the Atlantic P. montagui. However, the larvae differ in several reliable anatomic respects from those of P. montagui and the adults are colored differently, leading P. tridens to be given full species status. Except for the difference in coloration and the fact that the rostrum of P. montagui ends in 2 points and that of P. tridens ends in 3, the adults of these two species are almost indistinguishable. P. tridens tends to have more rostral spines but the counts overlap. P. tridens also has shorter dactyls than does P. montagui.
The isopod Bopyroides hippolytes infests the gills of this species but does not infest P. montagui. It may also be parasitized by the Rhizocephalon barnacle Sylon hippolytes.
This species is a protandroushermaphrodite
(is a male first, then later becomes female). It appears to change
from male to female at about 1 1/2 to 2 years old. In the Strait
of Georgia females may be ovigerous
(carrying eggs) from late November to early April.
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Lamb and Hanby, 2005
General Notes and Observations: Locations,
abundances, unusual behaviors:
This dorsal view is also by Andrey Gontchar. This individual, which is the same as the one at the top of the page, is a mature female. It was collected at about 300 m depth in the Sea of Okhotsk, near southwestern Kamchatka.
Rosario Invertebrates web site provided courtesy of Walla Walla University