Sarawak pygmy swellshark: Difference between revisions
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I added a section describing the unique way in which the Sarawak pygmy shark reproduces, which I felt deserved more attention since this form of oviparity was only recently discovered, and this was the species it was discovered in. |
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==Description== |
==Description== |
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The species reaches a maximum size of 40.8 cm total length (TL); males mature at 32.5 cm TL and females at 35.4–40.8 cm TL.<ref name="Cephaloscyllium"/> The species uniquely uses sustained single [[Shark#Oviparity|oviparity]] producing larger but fewer eggs than others.<ref>{{cite news |last1=Shiffman |first1=David |title=This Mommy Shark Has a Unique Way of Making Babies |url=https://www.hakaimagazine.com/news/this-mommy-shark-has-a-unique-way-of-making-babies/ |access-date=26 October 2020 |work=[[Hakai Magazine]] |date=21 October 2020}}</ref> |
The species reaches a maximum size of 40.8 cm total length (TL); males mature at 32.5 cm TL and females at 35.4–40.8 cm TL.<ref name="Cephaloscyllium"/> The species uniquely uses sustained single [[Shark#Oviparity|oviparity]] producing larger but fewer eggs than others.<ref>{{cite news |last1=Shiffman |first1=David |title=This Mommy Shark Has a Unique Way of Making Babies |url=https://www.hakaimagazine.com/news/this-mommy-shark-has-a-unique-way-of-making-babies/ |access-date=26 October 2020 |work=[[Hakai Magazine]] |date=21 October 2020}}</ref> |
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== Sustained single oviparity == |
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The mode of [[oviparity]] in the Sarawak pygmy swellshark has been found to differ considerably from the two previously defined modes of oviparity found in [[Chondrichthyes|Chondrichthyans]]. This unique form of oviparity has been described as "sustained single oviparity," a mode of oviparity characterized by the deposition and retention of a single [[Egg case (Chondrichthyes)|egg case]] in each [[oviduct]] until the two embryos reach a length ranging 16.5–20.1% [[Total length|TL]].<ref>{{Cite journal |last=Nakaya |first=Kazuhiro |last2=White |first2=William T. |last3=Ho |first3=Hsuan-Ching |date=2020-07-23 |title=Discovery of a new mode of oviparous reproduction in sharks and its evolutionary implications |url=https://www.nature.com/articles/s41598-020-68923-1 |journal=Scientific Reports |language=en |volume=10 |issue=1 |pages=12280 |doi=10.1038/s41598-020-68923-1 |issn=2045-2322 |pmc=PMC7378224 |pmid=32703969}}</ref> |
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==References== |
==References== |
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Revision as of 21:20, 16 March 2023
| Sarawak pygmy swellshark | |
|---|---|
Scientific classification 
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| Domain: | Eukaryota |
| Kingdom: | Animalia |
| Phylum: | Chordata |
| Class: | Chondrichthyes |
| Subclass: | Elasmobranchii |
| Order: | Carcharhiniformes |
| Family: | Scyliorhinidae |
| Genus: | Cephaloscyllium |
| Species: | C. sarawakensis
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| Binomial name | |
| Cephaloscyllium sarawakensis | |
| Synonyms | |
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Cephaloscyllium circulopullum Ka. Yano, A. Ahmad & Gambang, 2005 | |
The Sarawak pygmy swellshark (Cephaloscyllium sarawakensis) is a species of catshark, belonging to the family Scyliorhinidae. It is found in the benthic zone near the edge of the Pacific continental shelf, at depths of 118–165 m.[2]
Description
The species reaches a maximum size of 40.8 cm total length (TL); males mature at 32.5 cm TL and females at 35.4–40.8 cm TL.[3] The species uniquely uses sustained single oviparity producing larger but fewer eggs than others.[4]
Sustained single oviparity
The mode of oviparity in the Sarawak pygmy swellshark has been found to differ considerably from the two previously defined modes of oviparity found in Chondrichthyans. This unique form of oviparity has been described as "sustained single oviparity," a mode of oviparity characterized by the deposition and retention of a single egg case in each oviduct until the two embryos reach a length ranging 16.5–20.1% TL.[5]
References
- ^ Rigby, C.L.; Sherman, C.S.; Ho, H.; Bin Ali, A.; Bineesh, K.K.; Derrick, D.; Dharmadi, Fahmi, Fernando, D.; Haque, A.B.; Maung, A.; Seyha, L.; Tanay, D.; Utzurrum, J.A.T.; Vo, V.Q.; Yuneni, R.R. (2021). "Cephaloscyllium sarawakensis". IUCN Red List of Threatened Species. 2021: e.T161380A22516400. doi:10.2305/IUCN.UK.2021-2.RLTS.T161380A22516400.en. Retrieved 18 November 2021.
{{cite journal}}: CS1 maint: multiple names: authors list (link) - ^ Froese, Rainer; Pauly, Daniel (eds.). "Cephaloscyllium sarawakensis". FishBase. September 2017 version.
- ^ "Cephaloscyllium sarawakensis". Zipcode Zoo. Retrieved 14 January 2013.
- ^ Shiffman, David (21 October 2020). "This Mommy Shark Has a Unique Way of Making Babies". Hakai Magazine. Retrieved 26 October 2020.
- ^ Nakaya, Kazuhiro; White, William T.; Ho, Hsuan-Ching (2020-07-23). "Discovery of a new mode of oviparous reproduction in sharks and its evolutionary implications". Scientific Reports. 10 (1): 12280. doi:10.1038/s41598-020-68923-1. ISSN 2045-2322. PMC 7378224. PMID 32703969.
{{cite journal}}: CS1 maint: PMC format (link)