gramandy's picture

Perinereis

Observed: 18th May 2013 By: gramandy
Kent Wildlife TrustThanet Coast ProjectWildwood Trust
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Perinereis
IMG_2076a
Description:

Green nereid (approx 15cm) found in the lower eulittoral under chalk boulder. Not seen this guy here before. Not recorded on MarLIN at all?

Identifications
Species interactions

No interactions present.

Comments

dejayM's picture

A Ragworm

I suspect you are right. But how can we be certain when they are so difficult to separate.
I have rudely offered an agreeable ID.
"With the biggest nereid worms, if photographed with a good macro lens (and in water), you would see the length of the antennae.
The classical way to identify nereids is by the number shape and pattern of the small teeth on the eversible pharynx. Although this seems very technical sometimes gentle pressure behind the head will cause the pharynx to be everted and it can be photographed. After that its generally high power microscopy to see details of the individual limbs(parapoda) and the chaetea they carry.
Some idea of the detail thats needed can be found on pages from a project we ran some years ago in Thailand. Different species but same problems" Mike Kendall in 2011 - here http://www.ispotnature.org/node/123250