(sea spider) has legs which are much longer than the proboscis
and trunk. It has chelate
The lateral projections from the trunk which serve as the
the legs are separated by at least half their diameter. The
are stout. Females of this family have either no ovigerous
legs or extremely reduced ones.
Common name(s): Spiny-thigh sea spider, Sea spider
by Joanna Cowles on an Epiactis
ritteri anemone in a sea cave at Cape
Flattery. Leg span 1.5 cm. Since no ovigerous
legs are present, this must be a female.
Cowles, July 2009)
How to Distinguish
In Anoplodactylus viridintestinalis the lateral
the trunk which serve as the bases of the legs are very close together,
virtually touching. Its intestine is bright green.
long-legged species have pedipalps
as well as chelicerae,
plus have well-developed ovigerous
legs even in females. Phoxicholidium quadradentatum
in Kozloff key) has extremely short auxiliary claws that are so small
may not even be seen.
Harbor, Alaska to Laguna Beach, CA. Also common in
and eastern Russia.
Male pycnogonids carry the eggs, on special anterior ovigerous
legs which are lateral to the chelicerae
present) but anterior to the first pair of walking legs.
In a study of the life history of a related pycnogonid from the North
Atlantic, P. tubulariae, Lovely (2005) found that
was much faster than has been reported for other pycnogonid
P. tubuluriae has a fast developmental mode
larva, with a development time of 21 days as compared to months for
pycnogonids. The larvae hatched and quickly infested the
Tubularia larynx, where they lived within the
Later they emerged, destroying the Tubularia
polyp. The abundance
of P. tubularia adults peaked in late summer as the
and Hanby, 2005
et al., 1985
Lovely, Eric C., 2005. The Life History of Phoxichilidium
tubulariae (Pycnogonida: Phoxichilidiidae).
12:1 pp. 77-92
General Notes and
abundances, unusual behaviors:
This is a view of the underside of the whole animal
|The closeup photos below show
head from above and below.
The large chelicerae
are readily seen but there are no pedipalps.
|Dorsal view. The large chelicerae flank
which is ventral to them. The rust-colored eye turret is
behind the chelicerae.
||Ventral view. The proboscis
is prominent below the chelicerae.
Authors and Editors of Page:
Dave Cowles (2009): Created original page
CSS coding for page developed by Jonathan Cowles (2007)