Radula of Crosslandia sp. 1
September 14, 2002
From: Peter Ajtai
Dear Bill,
I sent a message a while back about finding a Crosslandia species. It is now grouped under Crosslandia sp 1on your site.
During June I got a chance to visit the California Academy of Sciences, and with the gracious help of Yolanda Camacho got these scanning electron microscope images of the radula and jaw elements of the Crosslandia. Looking at these, I'm pretty sure it is in fact Crosslandia daedali. What do you think?
Take care,
Peter Ajtai.
ajtai@slugophile.org
Dear Peter,
Thanks for the photos. There is very little published information on the radular morphology of the scyllaeids, so I have added SEM photos today of the radulae of Scyllaea pelagica, Notobryon wardi, and Crosslandia viridis.
Your radula, with the spaced first lateral and central teeth, is most like that of Crosslandia viridis but the tuberculate jaw rodlets are a bit of a puzzle. According to Thompson & Brown (1981)
Scyllaea has this sort of jaw rodlets, while Crosslandia has smooth ones. Unfortunately my jaw mounts for these animals were a disaster, and I can't find any other published description to confirm Thompson & Brown's findings. Clearly this needs reinvestigating. In the mean time I assume your animal is a species of Crosslandia. However, the only information we have on the radular morphology of C. daedali are line drawings from light microscope mounts in the original description. These are not easily comparable with SEM photos, and until we have a better idea of the radular morphology of all the scyllaeids, there is very little to compare your radula with. The general shape and colour of your animal still looks rather different from what could be called 'typical' C. daedali. That is not to say it is not C. daedali, but at present I have no convincing evidence to say it is.
Best wishes,
Bill Rudman
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