Let's not forget Rapana venosa that is slowly making its way from east to west. In 1998 it was discovered at the mouth of the Chesapeake Bay in Virginia almost definitely introduced as a veliger dumped from a ship's ballast in the busy shipping lanes of the Bay. It is, of course, well established over the past century in the Black, Aegean, Adriatic, Mediterranean Seas from its native Southeast Asian/Korean waters. Rapana venosa is by far the largest marine stowaway in its spread globally.
Rich

On March 9, 2022 9:47:31 AM EST, Harry Lee <[log in to unmask]> wrote:
>Sorry for the recent re-posting of the message below consequent to my 
>premature upload a few minutes ago.
>
>For Indo-West Pacific marine snail immigrants, there is precedent for a 
>comparable itinerary: SW from the E Atlantic to the New World and thence 
>northward; see 
><https://listserv.uga.edu/scripts/wa-UGA.exe?A2=ind0908D&L=CONCH-L&P=R2152&X=OA18543384ED61B837A&Y=hglee2%40mindspring.com>. 
>Of course there are myriad hypothetical scenarios, but ocean currents 
>and veliger vagility certainly are part of the calculus.
>
>Harry
>
>> On 3/9/2022 4:57 AM, steve rosenthal wrote:
>>> Hello Paolo et al
>>>
>>> At the suggestion of one respondent, I have made a posting to
>>> iNaturalist with photos of two specimens, including one that is almost
>>> fully glossy.  The collection locality is Playa Secreto (Secret Beach,
>>> aka Secret Beach spot) in Isabella, NW Puerto Rico.
>>>
>>> On 3/9/22, Paolo G. Albano <[log in to unmask]> wrote:
>>>> Hi Steve,
>>>> Naria turdus was introduced into the Mediterranean Sea, with most
>>>> specimens coming from the Gulf of Gabes in Tunisia.
>>>> It is thus not entirely surprising that it is now found elsewhere
>>>> outside its native range, although the location is unexpected and 
>>>> indeed
>>>> points to shipping as a probable vector.
>>>> I would be interested in more information on the current findings 
>>>> and in
>>>> photos, if you can.
>>>> Cheers, Paolo
>>>>
>>>>
>>>> On 08-Mar-22 20:31, Steve Rosenthal wrote:
>>>>> I'm currently in NW Puerto Rico with a couple of other shell 
>>>>> collectors,
>>>>> and at one beach we've been finding reasonably fresh dead specimens of
>>>>> what appears to be Cypraea  (now Naria) turdus.  They are certainly 
>>>>> not
>>>>> the two local comparably-sized species (cinerea or acicularis, 
>>>>> which we've
>>>>> also found dead specimens of  to use as comparators; they are not 
>>>>> close in
>>>>> shape, pattern or color, and especially noteworthy is the weight 
>>>>> per size
>>>>> of the turdus).  I'm less than completely surprised because on at 
>>>>> least
>>>>> the last couple of auctions  on Shellauction.net, a dealer/seller 
>>>>> in Aruba
>>>>> ("ArubaShellClub") has been offering locally collected specimens of 
>>>>> "Naria
>>>>> turdus gabrieli" with the following comment
>>>>>
>>>>> "A new introduced species, a really exquisite gem!, taken at night 
>>>>> under
>>>>> rock by Aruba Shell Club Members and discoverers of this species new
>>>>> locality, possible introduced as veliger larvae, in ballast water from
>>>>> visiting oil tankers. Taken December 2021"
>>>>>
>>>>> It would be interesting to know where else in the Caribbean this shell
>>>>> might be spreading.  Aruba is pretty far from Puerto Rico!
>>>>> Do any other collectors now of other records?
>>>>>
>>>>> ----------------------------------------------------------------------
>>>>> [log in to unmask]  - a forum for informal discussions on 
>>>>> molluscs
>>>>> To leave this list, click on the following web link:
>>>>> http://listserv.uga.edu/scripts/wa-UGA.exe?SUBED1=conch-l-L&A=1
>>>>> Type your email address and name in the appropriate box and
>>>>> click leave the list.
>>>>> ----------------------------------------------------------------------
>>>> -- 
>>>>
>>>>
>>>>
>>>> Dr. Paolo G. ALBANO, Ph.D. (he/him) Senior Scientist, Stazione 
>>>> Zoologica
>>>> Anton Dohrn, National Institute of Marine Biology, Ecology and
>>>> Biotechnology, Naples, Italy Research Associate, Department of
>>>> Paleontology, University of Vienna, Austria E-mail: [log in to unmask];
>>>> Skype: pg.albano Twitter: @pg_albano; Google Scholar
>>>> <http://scholar.google.it/citations?user=DZ4zNfQAAAAJ>
>>>>
>>>> NEW Native biodiversity collapse in the Eastern Mediterranean
>>>> <https://royalsocietypublishing.org/doi/10.1098/rspb.2020.2469> open
>>>> access Full publication list including links to pdfs and journal
>>>> webpages here
>>>> <https://homepage.univie.ac.at/paolo.albano/publication_list.html>
>>>> Lessepsian migration project: Historical ecology of Lessepsian 
>>>> migration
>>>> <http://www.univie.ac.at/lessepsian/index.html> Personal web-site:
>>>> http://homepage.univie.ac.at/paolo.albano/
>>>>
>>>> ----------------------------------------------------------------------
>>>>
>>
>> ----------------------------------------------------------------------
>> [log in to unmask] - a forum for informal discussions on molluscs
>> To leave this list, click on the following web link:
>> http://listserv.uga.edu/scripts/wa-UGA.exe?SUBED1=conch-l-L&A=1
>> Type your email address and name in the appropriate box and
>> click leave the list.
>> ----------------------------------------------------------------------
>
>----------------------------------------------------------------------
>[log in to unmask] - a forum for informal discussions on molluscs
>To leave this list, click on the following web link:
>http://listserv.uga.edu/scripts/wa-UGA.exe?SUBED1=conch-l-L&A=1
>Type your email address and name in the appropriate box and
>click leave the list.
>----------------------------------------------------------------------

----------------------------------------------------------------------
[log in to unmask] - a forum for informal discussions on molluscs
To leave this list, click on the following web link:
http://listserv.uga.edu/scripts/wa-UGA.exe?SUBED1=conch-l-L&A=1
Type your email address and name in the appropriate box and
click leave the list.
----------------------------------------------------------------------