Hi Harry,
Thanks so much for your account. Oops, it seems like I there is enough
material there in those stashes to justify a return to substance abuse of
the rissoinophilic type. I will scan my old SEM (4x5) negatives and
post-them for the sake of illustrating your points. (Marlo has asked for
some illustrations, and I will send them to him to.)
Best wishes and thanks for the thoughtful response!
José
José H. Leal, Ph.D., Director and Curator
The Bailey-Matthews Shell Museum
Editor, The Nautilus
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From: Conchologists List [mailto:[log in to unmask]] On Behalf Of
Harry G. Lee
Sent: Thursday, February 16, 2012 5:49 PM
To: [log in to unmask]
Subject: Re: [CONCH-L] Rissoina angeli and R. striatocostata
Dear José et al.,
Of course I have your book; to lack it would be tantamount to malpractice of
rissoininophily.
Before getting to your species, let me offer a few additional thoughts on
the identity of Rissoina striatocostata d'Orbigny, 1842.
Gary Rosenberg takes this position on Malacolog 4.1.1
<http://www.malacolog.org/search.php?nameid=1996>
<http://www.malacolog.org/search.php?nameid=1996> : "Rolán & Luque (2000)
noted that a [my emphasis] syntype of R. striatocostata was conspecific with
one of R. decussata, but other authors e.g., Jong & Coomans (1988) have
considered the species distinct. They are treated as separate species here
pending a lectotype designation."
You (1991: 75) reported "the examined syntypes of R. striatocostata
(d'Orbigny Cuba Collection, BMNH 1854.10.4.209; 2 shells) have straighter
shell profile, lack the paired spiral cordlets on the middle of the first
teleoconch whorl, and have multispiral protoconchs, instead of the large,
paucispiral one in this species." This observation removes R. angeli from
the consideration.
Although I don't have access to the Rolán and Luque paper, it appears to me
that your independent [and earlier?] examination included the only extant
syntypes. Thus it may be unnecessary to lectotypify a syntype. I'll Cc this
to Drs. Rolán and Rosenberg in hopes of clarification. I recall that Marien
Faber was somewhat uncertain of the identity of the type material, and I
think he has taken a peek at it. In any event, lets consider R.
striatocostata and R. decussata synonymous for the moment.
Your species (Leal, 1991: 75; pl. pl. 8, figs. I-L) has a teleoconch very
similar to that of Colin's species 138, Marlo's shells at
<http://z14.invisionfree.com/Conchologist_Forum/index.php?showtopic=2343>
<http://z14.invisionfree.com/Conchologist_Forum/index.php?showtopic=2343> ,
R. angeli Espinosa and Ortea, 2002 (142; fig 1A), the holotype of Rissoa
affinis C.B. Adams, 1845 as revealed in the fine photographs taken on 12
Dec., 2011 by Marien, and the Sanibel shell depicted at the BMSM website
<http://shellmuseum.org/shells/shelldetails.cfm?id=23>
<http://shellmuseum.org/shells/shelldetails.cfm?id=23> . Even though yours
is the only SEM of this assortment, the conchological details are laudably
well-depicted in all these instances. While the protoconchs of the latter
four taxa are very similar (2-3 whorls, small nucleus, broadly conical),
yours and Colin's differ from them and each other. As you pointed out (Leal,
loc. cit.), the Brasilian seamount shell has a large paucispiral protoconch,
which distinguishes it from all these contenders (Colin's is another story).
Short version, I don't think we can give your shell a name.
I am struck by the analogous situation with the Phosinella you discovered in
the seamount fauna; see the R lower corner at
<http://www.jaxshells.org/88ff11.htm> <http://www.jaxshells.org/88ff11.htm>
as well as the Folinia sp. cited by Marien minutes ago. Each has
uncharacteristic lecithotrophic development and may have evolved atop (or
retreated to) these seamounts.
Espinosa, J. and J. Ortea, 2002. Descripción de cuatro nuevas especies de la
familia Rissoinidae (Mollusca: Gastropoda). Avicennia 15: 141-149.
Leal, J.H., 1991. Marine prosobranch gastropods from oceanic islands off
Brazil. Backhuys, Oegstgeest, Netherlands, x + pp. 1-418 incl. 22 pls.
Rolán, E. and A.A. Luque, 2000. The subfamily Rissoininae (Mollusca:
Gastropoda: Rissoidae) in the Cape Verde Archipelago (West Africa). Iberus
18: 21-94.
Harry
On 2/16/2012 1:27 PM, José H. Leal wrote:
Dear Harry, Marien, Colin, Marlo, and other rissoinophiles,
So it seems that R. affinis will be the name to use for the SW Florida
taxon, then.
I illustrated another species in this particular group of
"striatocostata"-like rissoinines in my 1991 book-dissertation on Brazilian
oceanic island gastropods. I used "Rissoina sp. 1" for that species,
mentioning that it was called R. decussata (Montagu, 1803) by Rios in the
several installations of his Brazilian shell books.
Since I've been away from rissoine research (or cured from rissoinophyly!)
since the late 1980s, would someone (Harry? Marien?) know anything new about
the identity of that species (I am assuming that you have copies of the book
for consultation.)
Kindly yours,
José
José H. Leal, Ph.D., Director and Curator
The Bailey-Matthews Shell Museum
Editor, The Nautilus
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www.shellmuseum.org <http://www.shellmuseum.org/>
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