Lagynocystis

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Lagynocystis
Temporal range: Cambrian, Furongian–Late Ordovician (upper Sandbian)[1]
Lagynocystis pyramidalis convex (left) and flat (right) surfaces
Scientific classification Edit this classification
Kingdom: Animalia
Phylum: Echinodermata
Class: †Stylophora
Order: †Mitrata
Family: †Lagynocystidae
Jaekel, 1918[2]
Genus: †Lagynocystis
Jaekel, 1918
Species:
†L. pyramidalis
Binomial name
†Lagynocystis pyramidalis
(Barrande, 1887) Jaekel, 1918
Synonyms

Lagynocystis is a genus of mitrate stylophoran known from the Furongian epoch of the Cambrian to the upper Sandbian age of the Ordovician, with specimens described from China, Czech Republic, France, the Iberian Peninsula, Morocco, Russia, and Wales.[1] It contains a single species, Lagynocystis pyramidalis, and is the only member of the family Lagynocystidae.[3] The genus bore internal bars morphologically similar to those found in modern cephalocordates and enteropneus, possibly suggesting their homology.[4]

Micro-CT scans of Lagynocystis pyramidalis and its internal bars in three specimens (a-b), and a generalized diagram of the arrangement and morphology of the internal bars (c)

References

  1. Rozhnov, Sergey V.; Mirantsev, Georgy V.; Terentiev, Sergey S. (2019-10-21). "First report of the mitrate Lagynocystis (Echinodermata: Stylophora) in the Ordovician of the Baltic paleobasin". Zoosymposia. 15: 115–122. doi:10.11646/zoosymposia.15.1.13. ISSN 1178-9913.
  2. Jaekel, Otto (1918). "Phylogenie und System der Pelmatozoen". Paläontologische Zeitschrift (in German). 3 (1): 1–128. doi:10.1007/BF03190413.
  3. Parsley, Ronald L. (2000). "Morphological and Paleoecolgical Analysis of the Ordovician Ankyroid Lagynocystis (Stylophora: Echinodermata)". Journal of Paleontology. 74 (2): 254–262. ISSN 0022-3360.
  4. Álvarez-Armada, Nidia; Cameron, Christopher B.; Bauer, Jennifer E.; Rahman, Imran A. (2022-05-11). "Heterochrony and parallel evolution of echinoderm, hemichordate and cephalochordate internal bars". Proceedings of the Royal Society B: Biological Sciences. 289 (1974). doi:10.1098/rspb.2022.0258. ISSN 0962-8452. PMC 9091856. PMID 35538784.

Further reading