A picture's worth a thousand words...

G.Thomas Watters, PhD
Curator of Molluscs
Department of Evolution, Ecology & Organismal Biology
The Ohio State University
1315 Kinnear Rd.
Columbus, OH 43212  USA
v: 614-292-6170
f: 614-292-7774

----- Original Message -----
From: David Campbell <[log in to unmask]>
Date: Monday, September 10, 2007 4:38 pm
Subject: [CONCH-L] Asaphis

> In the old collection I am sorting, there seem to be 3 types of
> Asaphis.  Not only has the collection suffered over time, but it was
> assembled from collections, some of which had suffered over time.
> Thus, not all the information (if any) is wholly reliable.  Anyone
> care to comment how these match up with specimens you have available?
>
> Species 1: Appears to be the Caribbean deflorata.  Relatively heavy
> shell, ribbing not evident on interior, posteriorventrally relatively
> angular; lower ribs which tend to be right triangles, so they look
> almost imbricated.  New ribs arise primarily by intercalation.
>
> Species 2: Appears to be the Indo-Pacific violascens.  Lighter shell,
> ribbing reflected on posterior interior margin.  Ventrally and
> posteriorventrally more rounded.  Ribs more cordlike, though still
> appearing somewhat imbricated, and taller than deflorata.
>
> Species 3: No very reliable locality info, no matching species spotted
> yet in handy references.  Moderately heavy shell, but ribbing evident
> on shell interior.  Ribs broad, often bifurcating, only weakly tilted
> surface.
>
> All highly variable in color pattern.
>
>
> --
> Dr. David Campbell
> 425 Scientific Collections
> University of Alabama
> "I think of my happy condition, surrounded by acres of clams"
>
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