An educational resource dedicated mainly to the photography
and diversity of marine life that can be found in coastal waters
and intertidal areas of Great Britain and Ireland by David Fenwick.

Arrow worm images (Phylum Chaetognatha)
Sagittoidea (Class) > Phragmophora (Order) > Spadellidae (Family)

Spadella cephaloptera (Busch, 1851) - An Arrow worm

Arrow worms Chaetognatha images UK