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{{Short description|Species of shark}}
{{Speciesbox
{{Speciesbox
| name = Sarawak pygmy swellshark
| name = Sarawak pygmy swellshark
| status = DD
| status = CR
| status_system = iucn3.1
| status_system = IUCN3.1
| status_ref = <ref name="iucn status 18 November 2021">{{cite iucn |author=Rigby, C.L. |author2=Sherman, C.S. |author3=Ho, H. |author4=Bin Ali, A. |author5=Bineesh, K.K. |author6=Derrick, D. |author7=Dharmadi, Fahmi, Fernando, D. |author8=Haque, A.B. |author9=Maung, A. |author10=Seyha, L. |author11=Tanay, D. |author12=Utzurrum, J.A.T. |author13=Vo, V.Q. |author14=Yuneni, R.R. |date=2021 |title=''Cephaloscyllium sarawakensis'' |volume=2021 |page=e.T161380A22516400 |doi=10.2305/IUCN.UK.2021-2.RLTS.T161380A22516400.en |access-date=18 November 2021}}</ref>
| status_ref = <ref name=iucn>Ebert, D.A., Ali, A., Pek Khiok, A.L. & Valenti, S.V. 2009. Cephaloscyllium sarawakensis. The IUCN Red List of Threatened Species 2009: e.T161380A5411037. https://dx.doi.org/10.2305/IUCN.UK.2009-2.RLTS.T161380A5411037.en. Downloaded on 19 September 2017.</ref>
| genus = Cephaloscyllium
| genus = Cephaloscyllium
| species = sarawakensis
| species = sarawakensis
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| synonyms = ''Cephaloscyllium circulopullum'' <small>Ka. Yano, A. Ahmad & Gambang, 2005</small>
| synonyms = ''Cephaloscyllium circulopullum'' <small>Ka. Yano, A. Ahmad & Gambang, 2005</small>
}}
}}

The '''Sarawak pygmy swellshark''' (''Cephaloscyllium sarawakensis'') is a [[species]] of [[catshark]], belonging to the [[family (biology)|family]] [[Catshark|Scyliorhinidae]]. It is found in the [[benthic zone]] near the edge of the [[Continental shelf|Pacific continental shelf]], at depths of 118&ndash;165&nbsp;m.<ref name="fishbase">{{fishbase species |genus=Cephaloscyllium |species= sarawakensis|month=September |year=2017}}</ref>
The '''Sarawak pygmy swellshark''' (''Cephaloscyllium sarawakensis'') is a [[species]] of catshark, belonging to the [[family (biology)|family]] [[Scyliorhinidae]]. It is found in the [[benthic zone]] near the edge of the [[Continental shelf|Pacific continental shelf]], at depths of 118&ndash;165&nbsp;m.<ref name="fishbase">{{FishBase |genus=Cephaloscyllium |species= sarawakensis|month=September |year=2017}}</ref>


==Description==
==Description==
The species reaches a maximum size of 40.8&nbsp;cm total length (TL); males mature at 32.5&nbsp;cm TL and females at 35.4&ndash;40.8&nbsp;cm TL.<ref name="Cephaloscyllium"/>
The species reaches a maximum size of 40.8&nbsp;cm length; males mature at 32.5&nbsp;cm length and females at 35.4&ndash;40.8&nbsp;cm length.<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>

== 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 [[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]].<ref>{{Cite journal |last1=Nakaya |first1=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 |journal=Scientific Reports |language=en |volume=10 |issue=1 |pages=12280 |doi=10.1038/s41598-020-68923-1 |issn=2045-2322 |pmc=7378224 |pmid=32703969|bibcode=2020NatSR..1012280N }}</ref>


==References==
==References==
{{Reflist|refs=
{{Reflist|refs=
<ref name="Cephaloscyllium">{{cite web|title=Cephaloscyllium sarawakensis|url=http://zipcodezoo.com/animals/c/cephaloscyllium_sarawakensis/|publisher=Zipcode Zoo|accessdate=14 January 2013}}</ref>
<ref name="Cephaloscyllium">{{cite web|title=Cephaloscyllium sarawakensis|url=http://zipcodezoo.com/animals/c/cephaloscyllium_sarawakensis/|publisher=Zipcode Zoo|access-date=14 January 2013}}</ref>
}}
}}


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[[Category:Cephaloscyllium]]
[[Category:Cephaloscyllium]]
[[Category:Cartilaginous fish described in the 21st century]]
[[Category:Fish described in 2005]]
[[Category:Fish described in 2005]]

Latest revision as of 09:05, 29 October 2024

Sarawak pygmy swellshark
Scientific classification Edit this classification
Domain: Eukaryota
Kingdom: Animalia
Phylum: Chordata
Class: Chondrichthyes
Subclass: Elasmobranchii
Order: Carcharhiniformes
Family: Scyliorhinidae
Genus: Cephaloscyllium
Species:
C. sarawakensis
Binomial name
Cephaloscyllium sarawakensis
Synonyms

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

[edit]

The species reaches a maximum size of 40.8 cm length; males mature at 32.5 cm length and females at 35.4–40.8 cm length.[3] The species uniquely uses sustained single oviparity producing larger but fewer eggs than others.[4]

Sustained single oviparity

[edit]

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% total length.[5]

References

[edit]
  1. ^ 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)
  2. ^ Froese, Rainer; Pauly, Daniel (eds.). "Cephaloscyllium sarawakensis". FishBase. September 2017 version.
  3. ^ "Cephaloscyllium sarawakensis". Zipcode Zoo. Retrieved 14 January 2013.
  4. ^ Shiffman, David (21 October 2020). "This Mommy Shark Has a Unique Way of Making Babies". Hakai Magazine. Retrieved 26 October 2020.
  5. ^ 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. Bibcode:2020NatSR..1012280N. doi:10.1038/s41598-020-68923-1. ISSN 2045-2322. PMC 7378224. PMID 32703969.
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