These are related as shown below . ( Pycnogonida ( sea spiders ) may be excluded from the chelicerates, which are then identified as the group labelled " Euchelicerata " .)
22.
If this is confirmed, it would mean the sea spiders are the last surviving ( and highly modified ) members of an ancient stem group of arthropods that lived in Cambrian oceans.
23.
The surviving marine species include the four species of xiphosurans ( horseshoe crabs ), and possibly the 1, 300 species of pycnogonids ( sea spiders ), if the latter are indeed chelicerates.
24.
This crab has also been found as an epibiont of loggerhead turtles along with the goose barnacles " Lepas anatifera " and " Conchoderma virgatum ", various other crabs, sea spiders, tunicates and hydroids.
25.
Although " sea spiders " are not true spiders, or even arachnids, their traditional classification as chelicerates would place them closer to true spiders than to other well-known arthropod groups, such as insects or crustaceans.
26.
The American SOSUS ( Sea Spider ) hydrophone network in the northern Pacific was tasked with reviewing its recordings in the hope of detecting an implosion ( or explosion ) related to such a loss.
27.
Other species on the seamount include the tube worm " P . palmiformis ", the sea snail " Lepetodrilus fucensis ", the bristle worm " Amphisamytha galapagensis ", and the sea spider " Sericosura verenae ".
28.
Among the threatened species are sea spiders that measure 30 cm ( 1 foot ) across, fluorescent sea gooseberries the size of a rugby football, 750 kinds of sandflea and many small mollusks and worms, Peck said.
2 : Hedgpethia : Refers to the scientifc and literary heritage of Joel Walker hedgpeth ( 1911-), who published many professional paers on the Pychnogonida ( sea spiders ), several popular works in marine and coastal biology, and several political and poetical works under the pseudonymn, Jerome Tichenor.
