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Gastropods of the Tamiami Formation

Gastropods of the Tamiami Formation

The Pinecrest Sand Member of the Tamiami Formation is a series of beds which contain an incredible diversity of marine life from the Upper Pliocene ranging from approximately 4.5 to 2.5 million years ago. Primary among the organisms that draw attention to these deposits are the gastropods which are so well preserved that they appear to have just recently washed upon the shore. Although both professional and amateurs have collected from the Sarasota quarries which have mined the mollusk shells for construction for over 50 years, a single monograph has never beeen produced. In addition, I am also picturing gastropods from the Tamiami coral reef facies, the Golden Gate Member which contains some of the same species as the Pinecrest but also many endemics. Although short on description which is essential in peer reviewed scientific publications, I hope this gallery will serve as a guide to those who have trouble in acquiring the few out of date works that have delt with the Pinecrest.

  • Album created by MikeR
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268 images

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Hi,

 

A lot of nice gastropods. I really love this fauna. Thanks for your great job.

 

Coco

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14 months without adding new shells is way too long, Mike ! :Wink1:

 

I’d like to know how you differentiate the five species of Hystrivasum, they’re so similar !

 

Coco

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On 1/15/2023 at 2:27 PM, Coco said:

14 months without adding new shells is way too long, Mike ! :Wink1:

 

I’d like to know how you differentiate the five species of Hystrivasum, they’re so similar !

 

Coco

 

Hi Coco

 

I just now saw your comment from January.  H. locklini is the common Sarasota species and has four chords between the shoulder and basal spines.  H. lindae is very similar, but the shoulder spines are larger and body chords less "shaggy."  H. squamosum is similar to H. locklini, but has five body chords.  All three which are found in the Sarasota Pinecrest are similar and I feel are possibly variants of one species.

 

H. shrinerae is very rare in Sarasota, but more common in the old Kissimmee River dredgings and has six body chords.  H. horridum has very large spines and is more constricted at the base than the others.  It is also found primarily in the Lower Pleistocene Caloosahatchee Formation.  I have it listed as Tamiami only because Caloosahatchee deposits have not been reported as far south as Boca Grande, but this might be an outlying unreported deposit.

 

Mike

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Hi Mike,

 

Always interesting ! On the last two prunum, are there differences of color or relief on the shell ?

 

Coco

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Conuropsis

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Great guide.  Id. a few of my shells from here.

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