Tanystylum occidentalis (Cole, 1904)
Common name(s): Sea spider, pycnogonid
|Tanystylum occidentalis from under an intertidal rock near the S end of Lopez Island. Total leg span about 8 mm.|
|(Photo by: Dave Cowles, July 2006)|
How to Distinguish from Similar Species:Tanystylum spp have a proboscis which is at least 3x as long as its diameter at the base and tapers to a conical point. T. anthomasti is covered with setae and is usually associated with Gersemia rubriformis. Most other species have well-developed chelicerae.
Habitat: We found it under a rock in the intertidal.
|Main Page||Alphabetic Index||Systematic Index||Glossary|
In this closeup view one can see the tiny turretlike head with 4 eyes (near the left end of the body, between the left (front) pair of legs). The proboscis is much larger than the head and extends to the left of the body.
Here is an even closer view of the turret-like head, which appears as a small tubercle covered with 4 eyes, and also of the proboscis
In this ventral view, the small ovigerous legs can be seen on the underside of the first body segment (left side, just to the right of the proboscis). Here the animal is extending its other, walking legs upward and away from the camera. The proboscis is to the left. Females of some families lack ovigerous legs and in other families they are reduced in females.
Pycnogonids are frequently found clinging to hydroids, as here on the hydroid Aglaophenia sp.