Orthopyxis everta (Clark, 1876)
|Synonyms: Eucopella everta|
Subclass Leptotheca (Leptomedusae; Thecata)
|Orthopyxis everta, about 2 mm tall, on a tunicate. Note the annulated pedicel and smooth rim to the hydrotheca.|
|(Photo by: Dave Cowles, August 2010 )|
How to Distinguish from Similar Species: Several similar genera such as Campanularia and Clytia have cusps or undulations on the rim of the hydrotheca. Orthopyxis compressa and O. integra have smooth, non-annulated pedicels
Geographical Range: British Columbia to southern California.
Depth Range: 2-77 m.
Habitat: Sometimes found abundantly on kelp
Biology/Natural History: The colonies
grow in a stolon.
This hydroid retains
its gametes. The larvae of the pycnogonid Tanystylum
duospinum live parasitically on this species.
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General Notes and Observations: Locations, abundances, unusual behaviors:
Another indivudual on the same tunicate. Note the diatoms attached
to some stalks.
Rosario Invertebrates web site provided courtesy of Walla Walla University