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Date: | Tue, 26 Jun 2012 12:30:26 -0600 |
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Both shells are Nerita polita. Without seeing the operc, it can be very
difficult to separate these species with 100% surety, but there are several
shell structural clues that can help. Nerita maxima is seldom as glossy or
shiny, usually has definite spiral bands, and has a "bit" more of a spire
(almost flat in N. polita). The problem is that each of these characters
can vary and I have seen specimens of N. polita and N. maxima that were
almost identical in shell structure and color. The operc, of course, is
always a telling feature and is 100% diagnostive. N. polita has the typical
flat surfaced operc while N. maxima has an operc that is covered with
denticals. If you would like I can send the draft write ups for both
species and the color plates. Just let me know.
Tom
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From: "Olivier Caro" <[log in to unmask]>
Sent: Tuesday, June 26, 2012 3:06 AM
To: <[log in to unmask]>
Subject: [CONCH-L] Neritidae question
> @ Tom Eichhorst and other specialists or enthusiasts...
>
> Here are two Neritids from Samoa, dead collected, without operc. I'd
> like to get your opinion regarding their ID, please.
>
> http://www.idscaro.net/sci/03_myst/index.htm#gotosamoa
>
> Thanks!
>
> Olivier Caro
>
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