Angular angelshark: Difference between revisions
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{{Short description|Species of shark}} |
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{{Taxobox |
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{{Speciesbox |
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| name = Angular |
| name = Angular angelshark |
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| image = |
| image = |
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| image_caption = |
| image_caption = |
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| status = EN |
| status = EN |
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| status_system = IUCN3.1 |
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| genus = Squatina |
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| species = guggenheim |
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| ⚫ | |||
| phylum = [[Chordate|Chordata]] |
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| classis = [[Chondrichthyes]] |
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| subclassis = [[Elasmobranchii]] |
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| ordo = [[Squatiniformes]] |
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| familia = [[Squatinidae]] |
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| genus = ''[[Squatina]]'' |
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| species = '''''S. guggenheim''''' |
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| range_map = Squatina guggenheim distmap.png |
| range_map = Squatina guggenheim distmap.png |
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| range_map_width = 200px |
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| range_map_caption = Range of Angular angelshark (in blue) |
| range_map_caption = Range of Angular angelshark (in blue) |
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| synonyms = ''Squatina punctata'' <small>Marini, 1936</small> |
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| ⚫ | |||
}} |
}} |
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{{Portal|Sharks}} |
{{Portal|Sharks}} |
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The '''angular angelshark''' or '''''Squantina guggenheim''''' are sharks in the [[Squatiniformes|Squantinidae]] family. They originate in [[Brazil]], [[Uruguay]], and [[Argentina]] while living in marine, [[Brackish water|brackish]], and [[Demersal zone|demersal]] environments at depth of approximately 4-360 m. Their typical food sources consist of [[Osteichthyes|bony fish]], [[Crustacean|crustaceans]], and [[Mollusca|mollusks]].<ref name="fishbase">{{Cite web |title=Squatina guggenheim, Angular angel shark |url=https://www.fishbase.de/summary/Squatina-guggenheim.html |access-date=2022-04-12 |website=www.fishbase.de}}</ref> |
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== Morphology == |
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The '''angular angel shark''', ''Squatina guggenheim'', is an [[angel shark]] of the [[family (biology)|family]] [[Squatinidae]] found off southern [[Brazil]] and [[Argentina]] at depths of between 4 and 265 m. Its length is up to 1.3 m. |
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The ''Squantina Guggenheim'' is shaped like a [[Batoidea|ray]] and in males, a spiny surface is located on its pectoral fins.<ref name="fishbase"></ref>However, this spiny surface is absent in females and younglings. This spiny structure is thought to help hold females while mating. Typically, both males and females range 89-130 cm in length. ''Squantina Guggenheim'' have 18-22 teeth in the upper and lower jaw. |
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== Life Cycle == |
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Reproduction is [[ovoviviparous]], with 6 to 8 pups in a litter. |
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The ''Squantina Guggenheim'' like some ''[[Chondrichthyes]]'' is [[Ovoviviparity|ovoviviparous]], however the females' left [[ovary]] is only functional and the [[Embryo|embryos]] use the [[yolk]] as nutrition during the pregnancy. The right ovary has been found to have very little oocytes and is ineffective.<ref>{{Cite web |title=Squatina guggenheim {{!}} Shark-References |url=https://shark-references.com/species/view/Squatina-guggenheim |access-date=2022-04-12 |website=shark-references.com}}</ref> Typically, females will carry for 9-12 months and have approximately 3-9 pups in shallow waters.<ref name=":0">{{Cite web |title=Squatina guggenheim (Angular angel shark) |url=http://sharkrayresearch.weebly.com/squatina-guggenheim-angular-angel-shark.html |access-date=2022-04-12 |website=sharks, rays and chimaeras}}</ref> |
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== Distribution == |
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It was formerly named ''Squatina occulta''. |
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''Squantina Guggenheim'' is found primarily in the Southwestern Atlantic. They are abundant along the coast of Argentina, Uruguay and Brazil. This area is a [[Subtropics|subtropical zone]] and is at a latitude of 20°S - 45°S and a longitude of 68°W - 40°W.<ref name="fishbase"></ref> Typically, ''Squantina Guggenheim'' are found in sandy or muddy areas of the ocean floor.<ref name=":0" /> |
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== Conservation == |
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Currently, ''Squantina Guggenheim'' is considered an endangered species by the [[IUCN Red List|IUCN red list]] due to overfishing and are more susceptible due to the fact they are bottom dwellers. In addition, it may be possible females leave their young earlier on due to the stresses induced from fishing. Currently, Brazil has not taken any action in helping restore this species population.<ref name=":0" /> |
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==References== |
==References== |
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<references /> |
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* {{FishBase species | genus = Squatina | species = guggenheim | month = July | year = 2006}} |
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* [[Leonard Compagno|Compagno]], Dando, & Fowler, ''Sharks of the World'', Princeton University Press, New Jersey 2005 ISBN 0-691-12072-2 |
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{{Selachimorpha|Sq.}} |
{{Selachimorpha|Sq.}} |
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{{Taxonbar|from=Q28842}} |
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[[Category:Squatinidae|angular angelshark]] |
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{{DEFAULTSORT:Angular Angel Shark}} |
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[[Category: |
[[Category:Fish of Uruguay]] |
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[[Category:Fish of the Western Atlantic]] |
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[[Category:Fish described in 1936|angular angelshark]] |
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[[de:Guggenheim-Engelhai]] |
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[[es:Squatina guggenheim]] |
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[[fr:Squatina guggenheim]] |
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[[nl:Gebogen zee-engel]] |
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[[sv:Squatina guggenheim]] |
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[[vi:Squatina guggenheim]] |
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Latest revision as of 16:45, 19 August 2024
| Angular angelshark | |
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Scientific classification 
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| Domain: | Eukaryota |
| Kingdom: | Animalia |
| Phylum: | Chordata |
| Class: | Chondrichthyes |
| Subclass: | Elasmobranchii |
| Subdivision: | Selachimorpha |
| Order: | Squatiniformes |
| Family: | Squatinidae |
| Genus: | Squatina |
| Species: | S. guggenheim
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| Binomial name | |
| Squatina guggenheim Marini, 1936
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| Range of Angular angelshark (in blue) | |
| Synonyms | |
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Squatina punctata Marini, 1936 | |
The angular angelshark or Squantina guggenheim are sharks in the Squantinidae family. They originate in Brazil, Uruguay, and Argentina while living in marine, brackish, and demersal environments at depth of approximately 4-360 m. Their typical food sources consist of bony fish, crustaceans, and mollusks.[1]
Morphology
[edit]The Squantina Guggenheim is shaped like a ray and in males, a spiny surface is located on its pectoral fins.[1]However, this spiny surface is absent in females and younglings. This spiny structure is thought to help hold females while mating. Typically, both males and females range 89-130 cm in length. Squantina Guggenheim have 18-22 teeth in the upper and lower jaw.
Life Cycle
[edit]The Squantina Guggenheim like some Chondrichthyes is ovoviviparous, however the females' left ovary is only functional and the embryos use the yolk as nutrition during the pregnancy. The right ovary has been found to have very little oocytes and is ineffective.[2] Typically, females will carry for 9-12 months and have approximately 3-9 pups in shallow waters.[3]
Distribution
[edit]Squantina Guggenheim is found primarily in the Southwestern Atlantic. They are abundant along the coast of Argentina, Uruguay and Brazil. This area is a subtropical zone and is at a latitude of 20°S - 45°S and a longitude of 68°W - 40°W.[1] Typically, Squantina Guggenheim are found in sandy or muddy areas of the ocean floor.[3]
Conservation
[edit]Currently, Squantina Guggenheim is considered an endangered species by the IUCN red list due to overfishing and are more susceptible due to the fact they are bottom dwellers. In addition, it may be possible females leave their young earlier on due to the stresses induced from fishing. Currently, Brazil has not taken any action in helping restore this species population.[3]
References
[edit]- ^ a b c "Squatina guggenheim, Angular angel shark". www.fishbase.de. Retrieved 2022-04-12.
- ^ "Squatina guggenheim | Shark-References". shark-references.com. Retrieved 2022-04-12.
- ^ a b c "Squatina guggenheim (Angular angel shark)". sharks, rays and chimaeras. Retrieved 2022-04-12.