BDeed's picture

Unknown Ragworm

Observed: 26th March 2011 By: BDeed
Merseyside BioBankThe Wildlife Trust for Lancashire, Manchester and
BDeed’s reputation in InvertebratesBDeed’s reputation in InvertebratesBDeed’s reputation in InvertebratesBDeed’s reputation in Invertebrates
ragworm1
ragworm2
Description:

Another unknown ragworm found under a stone at low tide, again unable to get a good head-shot.

Identifications
Species interactions

No interactions present.

Comments

Mike Kendall's picture

It is a ragworm but

Identifying ragworms is difficuly as you need to see details of antennae jaws and often details of the chaetae. The commonest species on rocky shores tends to be N.pelagica

Mike Kendall

BDeed's picture

ragworms

Cheers Mike, i think you may have commented on the last one i put on here, is it necessary to capture the worm and ID under a microscope, or is it possible to get a picture of the features?

Mike Kendall's picture

ragworms

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

http://www.nhm.ac.uk/research-curation/research/projects/taxinfo/help/ho...

Mike Kendall

BDeed's picture

Thats brilliant, thanks

Thats brilliant, thanks