APHOTOMARINE

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.

A-P-H-O-T-O Wildlife Stock Image Library
Tetrastemma vermiculus (Quatrefages, 1846) - A tetrastemmatid nemertean (Nemertean worm images)
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Nemertean / Ribbon worm
Tetrastemma vermiculus
- anterior dorsal view 1

Nemertean / Ribbon worm
Tetrastemma vermiculus
- anterior dorsal view 2

Nemertean / Ribbon worm
Tetrastemma vermiculus
- specimen coiled 1

Nemertean / Ribbon worm
Tetrastemma vermiculus
- specimen coiled 2

Nemertean / Ribbon worm
Tetrastemma vermiculus
- anterior ventral view mouth 1

Specimen above found in a large middleshore pool with Coral Weed at Battery Rocks, Penzance, Cornwall. 02.04.17.

Nemertean / Ribbon worm
Tetrastemma vermiculus
- dorsal view 1

Nemertean / Ribbon worm
Tetrastemma vermiculus
- dorsal view head 1

Nemertean / Ribbon worm
Tetrastemma vermiculus
- lateral view 1

Nemertean / Ribbon worm
Tetrastemma vermiculus
- dorsal view 2

Nemertean / Ribbon worm
Tetrastemma vermiculus
- anterior lateral view 1

Nemertean / Ribbon worm
Tetrastemma vermiculus
- dorsal view 2

Nemertean / Ribbon worm
Tetrastemma vermiculus
- dorsal view 3

A small nemertean species, specimen found on sampling hydroid covered algae, mainly Chondrus crispus, in pools on the lowershore at Chyandour Rocks, Penzance, Cornwall. 31.05.14 and 0106.14. SW4799530882.

Nemertean / Ribbon worm
Tetrastemma vermiculus
- dorsal view with 0.1mm rule 1

Nemertean / Ribbon worm
Tetrastemma vermiculus
- dorsal view with 0.1mm rule 2

Nemertean / Ribbon worm
Tetrastemma vermiculus
- dorsal view 4

Nemertean / Ribbon worm
Tetrastemma vermiculus
- contracted 1

Specimen above found on sampling from sides of pontoons of Newlyn Marina, Newlyn, Cornwall. 13.12.14.

Nemertean / Ribbon worm
Tetrastemma vermiculus
- dorsal view with 0.1mm rule 3

Nemertean / Ribbon worm
Tetrastemma vermiculus
- lateral view 2

Nemertean / Ribbon worm
Tetrastemma vermiculus
- anterior dorsal view 3

Nemertean / Ribbon worm
Tetrastemma vermiculus
- anterior lateral view 2

Nemertean / Ribbon worm
Tetrastemma vermiculus
- head and proboscis 1

Nemertean / Ribbon worm
Tetrastemma vermiculus
- proboscis 1

Nemertean / Ribbon worm
Tetrastemma vermiculus
- stylet 1

Nemertean / Ribbon worm
Tetrastemma vermiculus
- stylet 2

Nemertean / Ribbon worm
Tetrastemma vermiculus
- stylet 3

Specimen above found in a sample of Corallina officinalis, Coral Weed, from the lowershore at Battery Rocks, Penzance, Cornwall. 20.05.15.

Nemertean / Ribbon worm
Tetrastemma vermiculus
- framentation due to stress 1

Nemertean / Ribbon worm
Tetrastemma vermiculus
- framentation due to stress 2

Nemertean / Ribbon worm
Tetrastemma vermiculus
- framentation due to stress 3

Nemertean / Ribbon worm
Tetrastemma vermiculus
- framentation due to stress 4

Nemertean / Ribbon worm
Tetrastemma vermiculus
- framentation due to stress 5

Specimen above found on sampling from sides of pontoons of Newlyn Marina, Newlyn, Cornwall. 30.10.18. The specimen started to fragment on being stressed by the evaporation of seawater from the dish it was kept in. I have been informed by Prof. Juan Junoy that this fragmentation is not a true form of asexual reproduction as the fragments often degenerate after a few days.

Nemertean / Ribbon worm
Tetrastemma vermiculus
- one stripe between eyes 1

Nemertean / Ribbon worm
Tetrastemma vermiculus
- one stripe between eyes 2

This rather distinctive Tetrastemma normally has dark stripes between its eyes. Here is an example of an oddity, a specimen with only one stripe. This potentially means forms with no stripes between the eyes may be possible. The stripes are in the main constant as an external identification feature but it means more care might be needed in identifying Tetrastemma without stripes between the eyes. The specimen was small, and found on the lowershore at Chimney Rocks, Penzance, Cornwall. 03.10.16.

Tetrastemma vermiculus Nemertean Ribbon worm Images
The main objective of this website is in furthering environmental awareness and education through the medium of photography. To increase awareness and access to the wildlife of the region and help
people find and identify it. Sometimes the difference between species is obvious but many species can only be determined by observing microscopic characteristics that are specific to any one species.