ChrisMcA's picture

Palserr318

Observed: 6th November 2006 By: ChrisMcAChrisMcA is knowledgeable about InvertebratesChrisMcA’s earned reputation in InvertebratesChrisMcA’s earned reputation in InvertebratesChrisMcA’s earned reputation in InvertebratesChrisMcA’s earned reputation in Invertebrates
Palserr318
Palserr317
Description:
Identifications
Species interactions

No interactions present.

Comments

nightfly's picture

Hi Chris,Just noticed this

Hi Chris,

Just noticed this observation, I saved the image and closed in on the head end, if I'm not mistaken I can see the paddle like structures on this one also.

Can you tell me how it is IDed as P. serratus so that I will know what to look for in my own pics?

Cathal.

ChrisMcA's picture

I should have posted the 2nd

I should have posted the 2nd pic, where you can just about see the upcurved rostrum.

gramandy's picture

could...

...also be P.adspersus which has slight upward curvature - really need to look at underneath of rostrum - P.adspersus has 4 grouped serrations 2nd just under 1st. P.serratus has 4/5 in a line.

I'm picking up only pointed end to rostrum - so I'm leaning towards P.squilla now if there is no upturn to the rostrum?

ChrisMcA's picture

My ID is based on Collins

My ID is based on Collins guide'96 (P..Hayward etc) which has good side-on illustrns of the 6 sp's like P.elegans plus descriptions; & I find the illustrns well corroborated by EOL or google images. It shows P. elegans & P. adspersus with short rostra & photos in EOL & Google images show they dont extend much beyond where the forward antennae branch,whilst in my prawn the rostrum extends beyond that pt a distance = to that between eyes & branching pt.
Even though nrly straight on I'm clear it's upcurved (& not sideways!) & with sharp slender tip, which distinguishes it from P. longirostris
P.squilla is a bit of a curved ball; not in my Collins, in WoRMS (=marinespecies.org) it's unaccepted & a synonym for P.adspersus & in EOL it's either that or P.elegans.
I agree it's a bad way to photo prawns for ID.(& you might be right about the beachcombercoconut prawn gramandy).
I hope that explains some of my devious methods, Cathal. I've also found a site which lists uk species (which is under construction & seems not to go above families, eg http://www.nhm.ac.uk/research-curation/scientific-resources/biodiversity... & you then click on members of palimonidae.

nightfly's picture

There seems to be quite a bit

There seems to be quite a bit more to prawn IDing than I had thought. So far I have believed all the prawns I have seen to be P. serratus but I need to look closer. Thank for posting the above info Chris.

Cathal.