echiura

10

Scientific photography by Arthur Anker

1.- Crab megalopa (Carpilius sp ?)

2.- Stilapex montrouzieri (Moorea, French Polynesia)

3.- Euthamneus cf rostratus (Moorea, French Polynesia)

4.- Stauromedusa (French Polynesia)

5.- Pilumnus vespertilio (Madagascar)

6.- Notospermus tricuspidatus (Moorea, French Polynesia)

7.- Diopatra sp

8.- Galeommatid bivalve, possibly Scintilla sp

9.- A thalassematid echiuran (Madang, Papua New Guinea)

10.- Male ovigerous sea spider (Pycnogonida)

http://www.flickr.com/photos/artour_a/sets/72157623477677107/

Urechis unicinctus

….is a species of marine Spoon Worm (Phylum Echirua) which is commonly known as the “fat innkeeper worm” or “penis fish”. Urechis unicinctus is distributed along the along the coasts of Japan and surrounding areas. Urechis unicinctus like other members of the genus Urechis spends most of its life hidden in a self made U-shaped burrow. It is a suspension feeder and will feed by pulsating its body to drive water though its burrow, it will then produce a mucus net that lines the burrow and any edible particles caught on the net and the net itself are then eaten. 

Classification

Animalia-Echiura-Echiuroidea-Urechidae-Urechis-U. unicinctus

Image: J. Patrick Fischer

2

Green Spoonworm (Bonellia viridis)

…is a species of Echiruan or spoonworm found in the north-eastern Atlantic, Indian, and Pacific oceans, and the Red and Mediterranean and Red seas. Green spoonworms are highly sexually dimorphic, the females take the green form you see above, the males however are planktonic and live inside the females body. The presence/absence of the pigment bonellin determines sex. Green spoonworms are mainly detritivores and will anchor themselves to the floor with two hooks. They will also feed on small invertebrates aswell by using an extendable proboscis which is 10x their body size.

Phylogeny

Animalia-Echiura-Echiuroidea-Bonelliidae-Bonellia-viridis

Image Source(s)