File:Tectarius muricatus (beaded periwinkle snails) on phytokarst (San Salvador Island, Bahamas) 2 (15382864033).jpg

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Tectarius muricatus (Linnaeus, 1758) - beaded periwinkle snails on phytokarst.

These snails are on a phytokarst surface of aragonitic calcarenite limestones of the Hanna Bay Member (upper Rice Bay Formation, middle to upper Holocene). They are supratidal rocky shore bacteria/algae grazers. The jagged, pitted rock surface is phytokarst, formed by limestone being subjected to slow, partial dissolution by the life activities of bacteria and algae that coat the surfaces (= dark gray films). The snails are feeding on these biofilms by using their radulas to scrape away at the substrate. Phytokarst is one type of epikarst - limestone dissolution features at the top of the vadose zone.

Classification: Animalia, Mollusca, Gastropoda, Littorinidae

Locality: rocky cliffs along southern shoreline of Graham’s Harbour, just west of Bahamas Field Station, northern margin of San Salvador Island, eastern Bahamas
Date
Source Tectarius muricatus (beaded periwinkle snails) on phytokarst (San Salvador Island, Bahamas) 2
Author James St. John

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This image was originally posted to Flickr by James St. John at https://flickr.com/photos/47445767@N05/15382864033 (archive). It was reviewed on 13 October 2019 by FlickreviewR 2 and was confirmed to be licensed under the terms of the cc-by-2.0.

13 October 2019

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Date/TimeThumbnailDimensionsUserComment
current17:23, 13 October 2019Thumbnail for version as of 17:23, 13 October 20193,008 × 2,000 (1.85 MB)Ser Amantio di Nicolao (talk | contribs)Transferred from Flickr via #flickr2commons

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