LISTSERV at the University of Georgia
Menubar Imagemap
Home Browse Manage Request Manuals Register
Previous messageNext messagePrevious in topicNext in topicPrevious by same authorNext by same authorPrevious page (September 2007, week 1)Back to main CONCH-L pageJoin or leave CONCH-L (or change settings)ReplyPost a new messageSearchProportional fontNon-proportional font
Date:         Mon, 3 Sep 2007 22:44:49 +1200
Reply-To:     Conchologists List <CONCH-L@LISTSERV.UGA.EDU>
Sender:       Conchologists List <CONCH-L@LISTSERV.UGA.EDU>
From:         Andrew Grebneff <andrew.grebneff@STONEBOW.OTAGO.AC.NZ>
Subject:      Re: sinistral whelk nomenclature
In-Reply-To:  <20070902104059.43T96.224350.root@fepweb11>
Content-type: text/plain; charset=us-ascii; format=flowed

>I recently received as a gift a dead large sinistral whelk. >Incontrast to my other large one, this one has the double curve, as >shown on the aforementioned site (that of the Jacksonville club). >Is this the distinguishing feature of perversum? > >P.S. I finally bought a digital camera so will soon be able to >photograph shells that I need help with i.d.

The paper defines all living sinistral Busycon as one species, B. perversum. Though some still dare to defy me in this, I consider that B. perversum must also include the "extinct species" B. contrarium and dextral Pliocene-Pleistocene B. rapum (Heilprin 1887), which two differ only in chirality (coiling direction). Once the living dextral forms are examined I am confident that they too will fall under synonymy of B. perversum (they had BETTER). Use subspecies-level taxa at your peril.

"B" planulatum (Dall 1890), which also occurs in the Florida Plio-Pleistocene, I think is not a Busycon, and despite Olsson & Harbison 1953 it does develop a clearly-defined sutural channel just as does B. pyrum, but belongs in Busycotypus/Fulguropsis (which genera I hope someone is going to look hard at and soon, because I'm pretty sure the latter is a synonym of the former). It also shows a well-defined columellar plait and groove, which is not generally evident in Busycon.

"Classically" what was once thought to be B. perversum is the heavy low-spired conical Campeche Bay form with large well-spaced peripheral spines and a swollen spiral ridge around the base of the broad canal; the dextral equivalent of this morph is what has been known as B. eliceans or "Kiener's Whelk" from the Carolinas. These shells differ from the other extreme endmorph, which has a much narrower canal lacking the fold, and often a taller spire and many small close-spaced peripheral spines.... but wait, all of these characters overlap and just about any combination of characters can be found with a large-enough collection.

Don't spend ALL of your time playing with the camera... it's all too easy to do so!

Or ELSE! -- Andrew Grebneff Dunedin New Zealand Fossil preparator <> Seashell, Macintosh, VW/Toyota van nut

: > P

---------------------------------------------------------------------- - a forum for informal discussions on molluscs To leave this list, click on the following web link: Type your email address and name in the appropriate box and click leave the list. ----------------------------------------------------------------------

Back to: Top of message | Previous page | Main CONCH-L page