Payl:Vermicularia knorrii (Florida worm snail shells) (Sanibel Island, Florida, USA) 1 (49762451528).jpg
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Mubong sugid:
| Deskripsyon | Vermicularia knorrii (Deshayes, 1843) - intertwined Florida worm snail shells, modern (latest Holocene) The gastropods (snails & slugs) are a group of molluscs that occupy marine, freshwater, and terrestrial environments. Most gastropods have a calcareous external shell (the snails). Some lack a shell completely, or have reduced internal shells (the slugs & sea slugs & pteropods). Most members of the Gastropoda are marine. Most marine snails are herbivores (algae grazers) or predators/carnivores. Seen here is one of the more bizarre gastropod shells around - this is Vermicularia, also called a worm snail. It’s one of the few snails that does not have a tightly coiled shell. Several snails from different families have shells somewhat like this (e.g., the vermetids & the turritellids). They all resemble the twisted mineralized shells made by some annelid worms, hence the common name “worm snails” or “worm shells”. Despite the superficially very different-looking shells, malacologists have demonstrated that Vermicularia is very closely related to the high-spired snail Turritella (<a href="http://www.gastropods.com/Shell_Images/T/Turritella_terebra_2.jpg" rel="noreferrer nofollow">www.gastropods.com/Shell_Images/T/Turritella_terebra_2.jpg</a>). Juvenile Vermicularia are free living, infaunal filter feeders that position themselves apex-down and aperture-up within the sediment. During this stage in ontogeny, the Vermicularia shell is tightly coiled, as is any ordinary gastropod shell. Later in life, the snail becomes an epifaunal, encrusting filter feeder (assuming hard or firm substrates are available), and its shell starts uncoiling. The advantage of an uncoiled shell in Vermicularia is generally inferred to be rapid upright growth (that’s desirable for a sessile, benthic filter feeder). If hard or firm substrates aren’t available, Vermicularia generally doesn’t grow an unwound shell during growth, and it ends up looking like typical a Turritella shell. The degree of uncoiling also depends on the nature of the hard substrate (e.g., a ramose scleractinian coral vs. a hemispherical scleractinian coral vs. a bivalve shell). So, shell uncoiling is an ecophenotypic character. Classification: Animalia, Mollusca, Gastropoda, Turritellidae Locality: Lighthouse Point beach, southern shore of the eastern tip of Sanibel Island, Gulf of Mexico coast of southern Florida, USA --------------- Most info. synthesized from Morton (1953) and Gould (1968, 1969): Morton (1953) - Vermicularia and the turritellids. Proceedings of the Malacological Society of London 30: 80-86. Gould (1968) - Phenotypic reversion to ancestral form and habit in a marine snail. Nature 220: 804. Gould (1969) - Ecology and functional significance of uncoiling in Vermicularia spirata: an essay on gastropod form. Bulletin of Marine Science 19: 432-445 |
| Petsa | |
| Gigikanan | Vermicularia knorii (Florida worm snail shells) (Sanibel Island, Florida, USA) 1 |
| Tagsulat | James St. John |
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This image was originally posted to Flickr by James St. John at https://flickr.com/photos/47445767@N05/49762451528. It was reviewed on 14 Abril 2020 by FlickreviewR 2 and was confirmed to be licensed under the terms of the cc-by-2.0. |
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| Petsa/Takna | Thumbnail | Mga dimensyon | Tiggamit | Komento | |
|---|---|---|---|---|---|
| kasamtangan | 02:58, 14 Abril 2020 | | 2,624 × 1,954 (2.96 MB) | Poldavia | Transferred from Flickr via #flickr2commons |
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