Dacryomya
Extinct genus of bivalves
title: "Dacryomya" type: doc version: 1 created: 2026-02-28 author: "Wikipedia contributors" status: active scope: public tags: ["prehistoric-bivalve-genera", "jurassic-animals-of-europe", "jurassic-bivalves", "nuculanidae"] description: "Extinct genus of bivalves" topic_path: "general/prehistoric-bivalve-genera" source: "https://en.wikipedia.org/wiki/Dacryomya" license: "CC BY-SA 4.0" wikipedia_page_id: 0 wikipedia_revision_id: 0
::summary Extinct genus of bivalves ::
| image = Nuculana lacryma lateral.jpg | image_alt = | image_caption = Two entire shells of Dacryomya lacryma | fossil_range = | taxon = Dacryomya | authority = Agassiz, 1840 | type_species = | type_species_authority = | subdivision_ranks = Species | subdivision_ref =MolluscaBase eds. (2024). MolluscaBase. Dacryomya Agassiz, 1840 †. Accessed through: World Register of Marine Species at: https://www.marinespecies.org/aphia.php?p=taxdetails&id=1484903 on 22 July 2024 | subdivision =
- Dacryomya diana (A. d'Orbigny, 1850)
- Dacryomya gaveyi (L. R. Cox, 1960)
- Dacryomya lacryma (J. De C. Sowerby, 1824) | synonyms =
- Nuculana (Dacryomya) Agassiz, 1840 superseded rank | synonyms_ref =
Dacryomya, or the pointed nutclam is an extinct genus of small-sized (approximately 1 cm long) saltwater clams, marine bivalve molluscs in the nutclam family Nuculanidae. The size and shape of the shells of species in this genus are reminiscent of broad apple pips.
Distribution
Dacryomya lived during the Lower and Middle Jurassic, possibly throughout the Tethys Faunal Province. Fossils of *D. lacryma * are known from the very late Lower Jurassic (Toarcian) of France (Causes, 44.3° N, 3.3° E); the early middle Middle Jurassic (Bajocian) of Germany (Sengenthal); and the very late Middle Jurassic (Callovian) of India (the Gadhada Sandstone Member and the Chari Formation, 23.5° N, 70.5° E).
Habitat
The fossil locations cited were open shallow subtidal areas, where this mollusc lived as a facultatively mobile infaunal deposit feeder-suspension feeder.
Other views
These additional views of the two shells of Dacromya lacryma give more information about the overall shape of the shell in that species: Image: Nuculana lacryma posterior.jpg Image: Nuculana lacryma beak.jpg Image: Nuculana lacryma anterior.jpg
References
References
- Agassiz, L. (1840). Mémoire sur les moules de mollusques vivans et fossiles. Première partie: Moules d'acephales vivans. Mémoires de Société des Sciences Naturelles de Neuchâtel. 2: 1– 48., available online at https://www.biodiversitylibrary.org/page/10595660 page(s): 34
- W. Kiessling, D. K. Pandey, M. Schemm-Gregory, H. Mewis, and M. Aberhan. 2011. "Marine benthic invertebrates from the Upper Jurassic of northern Ethiopia and their biogeographic affinities". ''Journal of African Earth Sciences'' 59:195–214
- Fürsich, F.T., R. Berndt, T. Scheuer and M. Gahr. Comparative ecological analysis of Toarcian (Lower Jurassic) benthic faunas from southern France and east-central Spain. Lethaia 34:169–199. 2001 [https://paleodb.org/cgi-bin/bridge.pl?a=displayCollResults&taxon_no=170000&max_interval=Jurassic&country=France&is_real_user=1&basic=yes&type=view&match_subgenera=1]
- [https://paleodb.org/cgi-bin/bridge.pl?a=displayCollResults&taxon_no=170000&max_interval=Jurassic&country=India&is_real_user=1&basic=yes&type=view&match_subgenera=1 F.T. Fürsich. 2006. Unpublished data from Kachchh]
- [https://paleobiodb.org/classic/checkTaxonInfo?taxon_no=169999 Paleobiology Database]
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