Ceolodiscus is an extinct genus of gastropod from the Lower and Middle Jurassic of Europe, mostly on Germany, France and United Kingdom.[1][2][3] Other posible records include specimens from Hungary of Earliest Jurassic (Hettangian) age.[4] As well there are specimens from Switzerland of Middle Jurassic age.[5] It is the only genus in the monotypic family Coelodiscidae.[6] The genus is usually allied with modern Pterotracheoidea, based mostly on its resemblance with modern Atlanta larvae, yet it differs by lacking extant family affiliations.[7] This genus is linked with the Toarcian Oceanic Anoxic Event, that likely triggered its evolution.[1]
| Coelodiscus | |
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| Life restoration | |
Scientific classification 
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| Domain: | Eukaryota |
| Kingdom: | Animalia |
| Phylum: | Mollusca |
| Class: | Gastropoda |
| Subclass: | Caenogastropoda |
| Order: | Littorinimorpha |
| Family: | †Coelodiscidae Gründel & Nützel, 2013 |
| Genus: | †Coelodiscus Broesamlen, 1909 |
| Species | |
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The shell is small but stocky; involute or with a slightly protruding spire. Whorls are generally smooth, evenly rounded and slightly overlapping; umbilicus deep, aperture ovate.[1] Is the oldest known holoplanktonic gastropod, thanks to a bilateral symmetrical shells as an adaption to active swimming. Beyond the most common of the sea snails of the Posidonienschiefer Formation, it is also one of the most varied in size terms.[1] It has been related to large floating driftwood as one of the primary settlers.[1]
References
edit- ^ a b c d e Teichert, Sebastian; Nützel, Alexander (2015). "Early Jurassic anoxia triggered the evolution of the oldest holoplanktonic gastropod Coelodiscus minutus by means of heterochrony". Acta Palaeontologica Polonica. doi:10.4202/app.00145.2014. ISSN 0567-7920.
- ^ Bandel, Klaus; Hemleben, Christoph (1987-02-11). "Jurassic Heteropods and their Modern Counterparts (Planktonic Gastropoda, Mollusca)". Neues Jahrbuch für Geologie und Paläontologie - Abhandlungen. 174 (1): 1–22. doi:10.1127/njgpa/174/1987/1. ISSN 0077-7749.
- ^ Schulbert, C.; Nuetzel, A. (2013). "Gastropods from the Early/Middle Jurassic transition of Franconia (Southern Germany)" (PDF). Bulletin of Geosciences. 88 (4): 723–778.
- ^ Szente, I. (1992). "Early Jurassic Molluscs from the Mecsek Mountains (S. Hungary. A preliminary study" (PDF). Annales Univ. Budapest. Sectio Geologica. 29 (1): 324–343.
- ^ Etter, Walter (1996). "Pseudoplanktonic and benthic invertebrates in the Middle Jurassic Opalinum Clay, northern Switzerland". Palaeogeography, Palaeoclimatology, Palaeoecology. 126 (3–4): 325–341. doi:10.1016/s0031-0182(96)00036-3. ISSN 0031-0182.
- ^ "Coelodiscidae". WoRMS. World Register of Marine Species. Retrieved 19 November 2024.
- ^ Wall-Palmer, Deborah; Janssen, Arie W; Goetze, Erica; Choo, Le Qin; Mekkes, Lisette; Peijnenburg, Katja T. C. A. (2020-03-21). "Fossil-calibrated molecular phylogeny of atlantid heteropods (Gastropoda, Pterotracheoidea)". dx.doi.org. Retrieved 2024-11-20.
- J. B. Knight et al. 1960. Systematic descriptions; Treatise on Invertebrate Paleontology, Part I, Mollusca (1):I196.
- Coelodiscus
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