Biology:Metastoma
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Restoration of Eurypterus with the general body parts of a eurypterid labelled. The metastoma can be seen between the pair of swimming paddles in the ventral view.
The metastoma is a ventral single plate located in the opisthosoma of non-arachnid dekatriatan chelicerates such as eurypterids,[1] chasmataspidids[2] and the genus Houia.[3] The metastoma located between the base of 6th prosomal appendage pair and may had functioned as part of the animal's feeding structures. It most likely represented a fused appendage pair originated from somite 7 (first opisthosomal segment), thus homologous to the chilaria of horseshoe crab and 4th walking leg pair of sea spider.[2] In eurypterids, the plate was typically cordate (heart-shaped) in shape, though differed in shape in some genera, such as Megalograptus.[4]
References
- ↑ Tollerton, Victor P. (1989). "Morphology, taxonomy, and classification of the order Eurypterida Burmeister, 1843" (in en). Journal of Paleontology 63 (5): 642–657. doi:10.1017/S0022336000041275. ISSN 0022-3360.
- ↑ 2.0 2.1 Dunlop, Jason A.; Lamsdell, James C. (2017). "Segmentation and tagmosis in Chelicerata". Arthropod Structure & Development 46 (3): 395–418. doi:10.1016/j.asd.2016.05.002. ISSN 1467-8039. PMID 27240897. https://www.academia.edu/28212892.
- ↑ Selden, Paul A.; Lamsdell, James C.; Qi, Liu (2015). "An unusual euchelicerate linking horseshoe crabs and eurypterids, from the Lower Devonian (Lochkovian) of Yunnan, China". Zoologica Scripta 44 (6): 645–652. doi:10.1111/zsc.12124. https://www.researchgate.net/publication/280917493.
- ↑ Caster, Kenneth E.; Kjellesvig-Waering, Erik N. (1964). "Upper Ordovician eurypterids of Ohio". Paleontological Research Institution. https://www.biodiversitylibrary.org/page/10693962.
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