Hidden angelshark

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Hidden angelshark

Critically Endangered (IUCN 3.1)[1]
Scientific classification edit
Kingdom: Animalia
Phylum: Chordata
Class: Chondrichthyes
Superorder: Selachimorpha
Order: Squatiniformes
Family: Squatinidae
Genus: Squatina
Species:
S. occulta
Binomial name
Squatina occulta
& , 1992

The hidden angelshark (Squatina occulta) is a species of angelshark that was named by and in 1994. It inhabits the Atlantic coastline of South America from southern Brazil to Argentina. Hidden angel sharks grow up to 124 cm in length and are ovoviviparous, meaning the embryos develop inside eggs that remain inside the mother's body until they are ready to hatch.[2][3]

The hidden angelshark differs from other species of angelshark due to the size of its neurocranial measurements. Its rostral region is considerably short compared to its counterparts. Its neurocraniam is its widest at the outer corners of its nasal capsules and post-orbital processes. The hidden angelshark's configuration is very similar to that of a ray, the one major difference is the shark's gills, which lie edgewise of the head. [4]

Although there are many speculations as to where this species resides, studies show they are found in Puerto Quequén, Necochea, Buenos Aires Province, Argentina.


References[]

  1. ^ Awruch, C.A.; Barreto, R.; Charvet, P.; Chiaramonte, G.E.; Cuevas, J.M.; Dolphine, P.; Faria, V.; Paesch, L.; Rincon, G. (2019). "Squatina occulta". IUCN Red List of Threatened Species. 2019: e.T39331A2899669. doi:10.2305/IUCN.UK.2019-1.RLTS.T39331A2899669.en. Retrieved 18 November 2021.
  2. ^ Dulvy, N.K. and J.D. Reynolds, 1997. Evolutionary transitions among egg-laying, live-bearing and maternal inputs in sharks and rays. Proc. R. Soc. Lond., Ser. B: Biol. Sci. 264:1309-1315.
  3. ^ Menni, R.C. and L.O. Lucifora, 2007. Condrictios de la Argentina y Uruguay. ProBiota, FCNyM, UNLP, Serie Técnica-Didáctica, La Plata, Argentina, 11:1-15. (Spanish)
  4. ^ Carvalho, M. R., Gomes, U. L., & Caio Faro. (2010, December 22). Comparative neurocranial morphology of angelsharks from the south‐western Atlantic Ocean (Chondrichthyes, Elasmobranchii, Squatinidae): Implications for taxonomy and phylogeny. Retrieved from https://onlinelibrary.wiley.com/doi/full/10.1111/j.1463-6395.2010.00495.x

Estalles, Maria Lourdes, et al. “The Southernmost Range Limit for the Hidden Angelshark Squatina Occulta.” Marine Biodevirsity Records, Esatalles, 1 Aug. 2016, link.springer.com/content/pdf/10.1186/s41200-016-0066-x.pdf.


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