Hymenodora frontalis Rathbun, 1902
Common name(s): Pacific ambereye
Infraorder Caridea (true shrimp)
|A female Hymenodora frontalis carrying eggs. Caught 1000-1500 m depth off Pt. Conception, CA. Note the yellowish eye, almost devoid of black pigment, and the large egg size.|
|(Photo by: Dave Cowles, May 1995)|
How to Distinguish from Similar Species: The rostrum of H. frontalis is longer than that of other Hymenodora, extending beyond the peduncle of the first antennae (see photo, photo).
Geographical Range: Pribilof Islands, Bering Sea to San Clemente Island, CA
Depth Range: 200 to 3000 m
Biology/Natural History: This bathypelagic species lives very deep in midwater. Its exoskeleton is so soft that it is often damaged on capture. Note that it has unusually large eggs for an Oplophorid shrimp. It is one of the most common deepliving Oplophorid shrimp off British Columbia. It is not a vertical migrator.
|Main Page||Alphabetic Index||Systematic Index||Glossary|
Butler TH (1980) Shrimps of the Pacific Coast of Canada. The Canadian Bulletin of Fisheries and Aquatic Sciences 202: 1–280
Wasmer, Robert A., 1967. Bathypelagic shrimps (Penaeidea and Caridea) from the eastern North Pacific. Master's thesis, Walla Walla College, College Place, WA. 86 pp.
Another photo of a gravid female. Photo by Dave Cowles in San Clemente Basin, CA, 1996. Caught at 1000-1500 m depth.
This gravid female was captured in San Clemente Basin, CA in May 1966. Frame from a video by Dave Cowles. Click Here to see the video
This side view of a preserved specimen shows the rostrum which extends well beyond the corneas of the eyes and even exceeds the peduncle of the first antenna.
Note also the pereopods. Oplophorids, unlike most other families of true shrimp, has exopods (exopodites) on its pereopods. The exopodites of the pereopods are short,
curved backward and used for swimming. The endopodites of the pereopods are longer, extended forward, and used for manipulating objects.
The eye pigment in Hymenodora is always pale, even in living specimens.
In this closeup dorsal view of the head, the median tubercles on the eyestalks near the corneas can be seen. From a presereved specimen.
This is a closeup dorsal view of the telson and uropods. The uropods are shorter than the telson and fringed with long setae. The telson is truncate (not rounded) on the end, with two long spines at the corners (one of which is broken off on this individual). Photo of a preserved individual.