Date: Sat, 19 Jun 2004 17:19:12 -0400
Reply-To: Conchologists of America List <CONCH-L@LISTSERV.UGA.EDU>
Sender: Conchologists of America List <CONCH-L@LISTSERV.UGA.EDU>
From: "Harry G. Lee" <shells@HGLEE.COM>
Subject: Re: Bittium and Diastoma
Joe Houbrick (1977) described the genus Bittium based on several species he
perceived as congeners. He commented "larvae planktotrophic with bilobed,
colorless velum ... larval shell about 2 1/2 whorls, smooth except for
median spiral ridge on 2nd whorl .... outer lip with tongue-shaped beak."
The three species were "Bittium reticulatum, B. varium, and several other
species from throughout the range of the genus." Shortly afterward, in the
same paragraph, he then commented: "Marcus and Marcus (1963) wrote an
extensive paper on the anatomy of Bittium varium in which they also
described and figured gametes, egg mass and larvae."
I have examined the protoconch of Diastoma varium (Pfeiffer, 1840), and,
although it is often eroded, when intact it is exactly as described above.
Based on protoconch anatomy and the observations attributed to the
Marcuses, I think it is a near certainty that this species is planktotrophic.
Houbrick, R. S., 1977. Reevaluation and new description of the genus
Bittium (Cerithiidae). The Veliger 20(2): 101-106 + 1 pl. Oct. 1.
Marcus, Er.and Ev. B.Marcus,1963. Mesogastropoden von der Küste von São
Paulo. Adhandl. Math.-Naturwissench. Klasse Akad. Wiss. & Lit. Mainz 1:
1-105; 86 figs. [not seen]
At 05:44 PM 6/11/2004, you wrote:
>Can anyone tell me about reproduction in Diastoma (formerly Bittium) varium
>in particular or the group in general? I specifically want to know if they
>have a planktonic larvae...if so, is it lecithotrophic or planktotrophic?
>Ryan M. Moody
>Dauphin Island Sea Lab
>101 Bienville Boulevard
>Dauphin Island, AL 36528
>(251) 861-7540 (fax)
Harry G. Lee
1801 Barrs St.
Jacksonville, FL 32204
Visit the Jacksonville Shell Club Home Page at:
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