caprellid amphipod has gills on only pereonites
3 and 4 (not on pereonite
2). It has no pereopods
3 and 4. Gnathopod
2 (the large set) has a propodus
which is less than 2/3 as wide as it is long (photo),
and the propodus
5-7(the back legs, with which it grasps the substrate) (photo)
has only one grasping spine or tooth (Smith and Carlton 1975 says there
are two or more). There is no spine on the ventral body
2 (photo), but there is
a large, dorsal, anteriorly
directed triangular spine on the back of the head (photo).
It has few or no tubercles
on the dorsal surface of the pereonites,
and none on pereonite
2 of the male is attached at the anterior end of pereonite
angusta Mayer, 1903
Common name(s): Skeleton shrimp
and Carlton (1975) state that Caprella
uniforma is probably a junior synonym. ITIS
does not list C.
at all but does list C.
with no range information.
angusta from eelgrass
in Padilla Bay. Total length about 4 cm. One of the
flaplike gills is visible posterior to the large grasping gnathopods
2, right at the end of the eelgrass.
|(Photo by: Dave Cowles,
How to Distinguish from
Similar Species: Tritella
pilimana has a vestigial pereopod
3 and 4, while Caprella angusta does not.
Several other members
of genus Caprella either do not have the large
on the dorsal side of the head, or also have large dorsal tubercles
on their pereonites
2 is attached near the middle of pereonite
amphipods such as this species are roving predators. We often
them climbing on eelgrass or hydroids searching for prey.
large claws (gnathopods)
and bizarre shape they would truly be monsters if they were our size!
and Carlton (1975) (as C. uniforma)
General Notes and
abundances, unusual behaviors:
This closeup shows pereonites
5-7 with their appendages, pereopods
5-7 arise from the posterior end of their segment (pereonite)
and are used for gripping the substrate such as this eelgrass
The left pereopod
7 is missing.
2 is less than 2/3 as wide as it is long. Note also the gill
This ventral view shows there is no spine between the large gnathopods
2 and shows the location of the gills.
This view of the head (animal is looking to the left) shows the very
large second antennae to the left, then the head with sessile
eyes and prominent, forward-directed head spine. Below the
be seen the first gnathopods
which are on the anterior end of the first thoracic segment (pereonite),
which extends out of view to the right.
Authors and Editors of Page:
Dave Cowles (2008): Created original page
CSS coding for page developed by Jonathan Cowles (2007)