on the site
Sea Skater Halovelia
Class Pycnogonida (Pantopoda)
Marine Spider Desis
segmented limbs and an external skeleton. Nearly all marine ones belong
to the subphylum Crustacea.
This subphylum is characterised by the presence of a tracheal system
which is used for breathing atmospheric air. Members of the subphylum
include those in the Class Colembola and Insecta.
Members of this subphylum have pincer-like appendages on the head
called chelicerae which are mainly used for feeding. They usually
breathe by means of special structures called "book-gills". Members
of the subphylum include those in the Class Pcynogonida, Arachnida