Metacarcinus: Difference between revisions

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{{Short description|Genus of crabs}}
{{Taxobox
{{Automatic Taxobox
| fossil_range = {{fossil_range|Oligocene|Recent}}
| fossil_range = {{fossil_range|Oligocene|Recent}}
| image =Cancer magister (James Dwight Dana).jpg
| regnum = [[Animal]]ia
⚫
| taxon = Metacarcinus
| phylum = [[Arthropod]]a
⚫
| authority = [[Alphonse Milne-Edwards|A. Milne-Edwards]], 1862
| subphylum = [[Crustacean|Crustacea]]
⚫
| type_species = ''[[Dungeness crab|Metacarcinus magister]]''
| classis = [[Malacostraca]]
| ordo = [[Decapoda]]
| infraordo = [[Crab|Brachyura]]
| familia = [[Cancridae]]
⚫
| genus = '''''Metacarcinus'''''
⚫
| genus_authority = [[Alphonse Milne-Edwards|A. Milne-Edwards]], 1862
⚫
| type_species = ''[[Dungeness crab|Cancer magister]]''
| type_species_authority = [[James Dwight Dana|Dana]], 1852
| type_species_authority = [[James Dwight Dana|Dana]], 1852
}}
}}


'''''Metacarcinus''''' is a genus of [[crab]]s formerly included in the genus ''[[Cancer (genus)|Cancer]]''.<ref name="Ng">{{cite journal |journal=[[Raffles Bulletin of Zoology]] |year=2008 |volume=17 |pages=1–286 |title=Systema Brachyurorum: Part I. An annotated checklist of extant Brachyuran crabs of the world |author=P. K. L. Ng, D. Guinot & P. J. F. Davie |url=http://rmbr.nus.edu.sg/rbz/biblio/s17/s17rbz.pdf}}</ref> It includes nine exclusively [[fossil]] species and five extant species, of which four are also known from the fossil record.<ref name="Grave">{{cite journal |journal = [[Raffles Bulletin of Zoology]] |year=2009 |volume = Suppl. 21 |pages=1–109 |title = A classification of living and fossil genera of decapod crustaceans |author1=Sammy De Grave |author2=N. Dean Pentcheff |author3=Shane T. Ahyong |url=http://rmbr.nus.edu.sg/rbz/biblio/s21/s21rbz1-109.pdf |format=[[Portable Document Format|PDF]]|display-authors=etal}}</ref> The [[monophyly]] of this genus was not supported by a [[molecular phylogenetics|molecular study]] using the [[Cytochrome c oxidase|cytochrome oxidase I]] gene.<ref>{{cite journal |author1=Michelle K. Harrison |author2=Bernard J. Crespi |lastauthoramp=yes |year=1999 |title=Phylogenetics of ''Cancer'' Crabs (Crustacea: Decapoda: Brachyura) |journal=[[Molecular Phylogenetics and Evolution]] |volume=12 |pages=186–199 |url=http://decapoda.arthroinfo.org/pdfs/4160/4160.pdf |format=[[Portable Document Format|PDF]] |doi=10.1006/mpev.1998.0608 |pmid=10381321}}</ref>
'''''Metacarcinus''''' is a genus of [[crab]]s formerly included in the genus ''[[Cancer (genus)|Cancer]]''.<ref name="Ng">{{cite journal |journal=[[Raffles Bulletin of Zoology]] |year=2008 |volume=Suppl. 17 |pages=1–286 |title=Systema Brachyurorum: Part I. An annotated checklist of extant Brachyuran crabs of the world |author=Peter K. L. Ng |author2=Danièle Guinot |author3=Peter J. F. Davie |name-list-style=amp |url=https://lkcnhm.nus.edu.sg/app/uploads/2017/04/s17rbz.pdf |url-status=live |archiveurl=https://web.archive.org/web/20110606061453/http://rmbr.nus.edu.sg/rbz/biblio/s17/s17rbz.pdf |archivedate=2011-06-06 }}</ref> It includes nine exclusively [[fossil]] species and five extant species, of which four are also known from the fossil record.<ref name="Grave">{{cite journal|journal=[[Raffles Bulletin of Zoology]] |year=2009 |volume=Suppl. 21 |pages=1–109 |title=A classification of living and fossil genera of decapod crustaceans |author1=Sammy De Grave |author2=N. Dean Pentcheff |author3=Shane T. Ahyong |url=https://lkcnhm.nus.edu.sg/app/uploads/2017/06/s21rbz1-109.pdf |display-authors=etal |url-status=live |archiveurl=https://web.archive.org/web/20110606064728/http://rmbr.nus.edu.sg/rbz/biblio/s21/s21rbz1-109.pdf |archivedate=2011-06-06 }}</ref> A [[molecular phylogenetics|molecular study]] using the [[Cytochrome c oxidase|cytochrome oxidase I]] gene does not support the [[monophyly]] of this genus.<ref>{{cite journal |author1=Michelle K. Harrison |author2=Bernard J. Crespi |name-list-style=amp |year=1999 |title=Phylogenetics of ''Cancer'' Crabs (Crustacea: Decapoda: Brachyura) |journal=[[Molecular Phylogenetics and Evolution]] |volume=12 |issue=2 |pages=186–199 |url=http://decapoda.arthroinfo.org/pdfs/4160/4160.pdf |doi=10.1006/mpev.1998.0608 |pmid=10381321}}</ref>


==Description==
⚫
Included species:<ref name="SandF2000">{{cite journal |author1=Carrie E. Schweitzer |author2=Rodney M. Feldmann |lastauthoramp=yes |year=2000 |title=Re-evaluation of the Cancridae Latreille, 1802 (Decapoda: Brachyura) including three new genera and three new species |journal=[[Contributions to Zoology]] |volume=69 |issue=4 |pages=223–250 |url=http://dpc.uba.uva.nl/ctz/vol69/nr04/art02}} Also available as [http://decapoda.nhm.org/pdfs/10785/10785.pdf PDF].</ref>
''Metacarcinus'' crabs have an oval carapace of about ⅔ of its largest width, with a surface with poorly marked division of smooth or gently colored regions. The front edge usually does not protrude before orbital, and the total length of these edges is 26–34% of the largest width of the carapace, with 5 spikes, including inner orbits, of which the middle springs lower than the others. 9–10 spikes are located on both anteroposterior lateral sides of the carapace; they can be of different shapes. The lateral edges are edged and can have one spike. The claws propodite is characterized by an upper edge at an angle of about 120° to the distal edge, equipped with sharp spines or grained or smooth keel. On the external surface of the propodite there are usually 4 balls. The cutting edges of the pliers' fingers of the claw have sharp teeth. The fixed finger has two points: middle and on the bottom edge.
*''[[Metacarcinus anthonyi]]'' (Pliocene to Recent)

==Extant species==
⚫
Included species:<ref name="SandF2000">{{cite journal |author1=Carrie E. Schweitzer |author2=Rodney M. Feldmann |name-list-style=amp |year=2000 |title=Re-evaluation of the Cancridae Latreille, 1802 (Decapoda: Brachyura) including three new genera and three new species |journal=[[Contributions to Zoology]] |volume=69 |issue=4 |pages=223–250 |doi=10.1163/18759866-06904002 |url=http://dpc.uba.uva.nl/ctz/vol69/nr04/art02 |access-date=2010-10-17 |archive-url=https://archive.today/20121209003405/http://dpc.uba.uva.nl/ctz/vol69/nr04/art02 |archive-date=2012-12-09 |url-status=dead |doi-access=free }} Also available as [http://decapoda.nhm.org/pdfs/10785/10785.pdf PDF].</ref>
{| class="wikitable"
|-
! Image !! Scientific name!! Common Name !! Distribution
|-
|[[File:Canceranthonyi.jpg|120px]] || ''[[Metacarcinus anthonyi]]'' ||yellow rock crab or yellow crab || Pacific coast of North America
|-
|[[File:Cancer edwardsii -Jaiba marmola Valpo f1.2.jpg|120px]] || ''[[Metacarcinus edwardsii]]'' || mola rock crab, southern rock crab, or Chilean rock crab|| Pacific coast between Guayaquil in Ecuador and the Beagle Channel in the southernmost Chile
|-
|[[File:Metacarcinus gracilis.jpg|120px]] || ''[[Metacarcinus gracilis]]'' ||graceful rock crab or slender crab || from Alaska to Bahía Magdelena, Baja California
|-
|[[File:Dungeness Crab - Flickr - brewbooks.jpg|120px]] || ''[[Dungeness crab|Metacarcinus magister]]'' ||Dungeness crab || west coast of North America
|-
|[[File:Pie Crust Crab.jpg|120px]] || ''[[Metacarcinus novaezelandiae]]'' ||Pie crust crab || New Zealand and south-eastern Australia.
|-
|}

==Fossils==
*† ''[[Metacarcinus danai]]'' (Miocene, California)
*† ''[[Metacarcinus danai]]'' (Miocene, California)
*† ''[[Metacarcinus davidi]]'' (Miocene to Pliocene, California)
*† ''[[Metacarcinus davidi]]'' (Miocene to Pliocene, California)
*''[[Metacarcinus edwardsii]]''
*† ''[[Metacarcinus goederti]]'' (Oligocene, Alaska)
*† ''[[Metacarcinus goederti]]'' (Oligocene, Alaska)
*''[[Metacarcinus gracilis]]'' (Pliocene to Recent)
*''[[Metacarcinus granti]]''
*† ''[[Metacarcinus izumoensis]]'' (Miocene, Japan)
*† ''[[Metacarcinus izumoensis]]'' (Miocene, Japan)
*† ''[[Metacarcinus jenniferae]]'' (Middle Pliocene, California)
*† ''[[Metacarcinus jenniferae]]'' (Middle Pliocene, California)
*''[[Dungeness crab|Metacarcinus magister]]'' (Pliocene to Recent)
*† ''[[Metacarcinus minutoserratus]]'' (Pliocene, Japan)
*† ''[[Metacarcinus minutoserratus]]'' (Pliocene, Japan)
*''[[Metacarcinus novaezelandiae]]''
*† ''[[Metacarcinus starri]]'' (Early Oligocene, Washington)
*† ''[[Metacarcinus starri]]'' (Early Oligocene, Washington)


==References==
==References==
{{reflist|32em}}
{{Reflist|32em}}


==External links==
==External links==
*{{Commons category-inline|Metacarcinus|''Metacarcinus''}}
*{{Commons category-inline|Metacarcinus|''Metacarcinus''}}

{{Taxonbar|from=Q6822374}}


[[Category:Cancroidea]]
[[Category:Cancroidea]]
[[Category:Decapod genera]]
[[Category:Extant Oligocene first appearances]]
[[Category:Extant Oligocene first appearances]]
[[Category:Taxa named by Alphonse Milne-Edwards]]




Latest revision as of 09:37, 7 November 2023

Metacarcinus
Temporal range: Oligocene–Recent
Scientific classification Edit this classification
Domain: Eukaryota
Kingdom: Animalia
Phylum: Arthropoda
Class: Malacostraca
Order: Decapoda
Suborder: Pleocyemata
Infraorder: Brachyura
Family: Cancridae
Genus: Metacarcinus
A. Milne-Edwards, 1862
Type species
Metacarcinus magister
Dana, 1852

Metacarcinus is a genus of crabs formerly included in the genus Cancer.[1] It includes nine exclusively fossil species and five extant species, of which four are also known from the fossil record.[2] A molecular study using the cytochrome oxidase I gene does not support the monophyly of this genus.[3]

Description[edit]

Metacarcinus crabs have an oval carapace of about ⅔ of its largest width, with a surface with poorly marked division of smooth or gently colored regions. The front edge usually does not protrude before orbital, and the total length of these edges is 26–34% of the largest width of the carapace, with 5 spikes, including inner orbits, of which the middle springs lower than the others. 9–10 spikes are located on both anteroposterior lateral sides of the carapace; they can be of different shapes. The lateral edges are edged and can have one spike. The claws propodite is characterized by an upper edge at an angle of about 120° to the distal edge, equipped with sharp spines or grained or smooth keel. On the external surface of the propodite there are usually 4 balls. The cutting edges of the pliers' fingers of the claw have sharp teeth. The fixed finger has two points: middle and on the bottom edge.

Extant species[edit]

Included species:[4]

Image Scientific name Common Name Distribution
Metacarcinus anthonyi yellow rock crab or yellow crab Pacific coast of North America
Metacarcinus edwardsii mola rock crab, southern rock crab, or Chilean rock crab Pacific coast between Guayaquil in Ecuador and the Beagle Channel in the southernmost Chile
Metacarcinus gracilis graceful rock crab or slender crab from Alaska to Bahía Magdelena, Baja California
Metacarcinus magister Dungeness crab west coast of North America
Metacarcinus novaezelandiae Pie crust crab New Zealand and south-eastern Australia.

Fossils[edit]

References[edit]

  1. ^ Peter K. L. Ng; Danièle Guinot & Peter J. F. Davie (2008). "Systema Brachyurorum: Part I. An annotated checklist of extant Brachyuran crabs of the world" (PDF). Raffles Bulletin of Zoology. Suppl. 17: 1–286. Archived (PDF) from the original on 2011-06-06.
  2. ^ Sammy De Grave; N. Dean Pentcheff; Shane T. Ahyong; et al. (2009). "A classification of living and fossil genera of decapod crustaceans" (PDF). Raffles Bulletin of Zoology. Suppl. 21: 1–109. Archived (PDF) from the original on 2011-06-06.
  3. ^ Michelle K. Harrison & Bernard J. Crespi (1999). "Phylogenetics of Cancer Crabs (Crustacea: Decapoda: Brachyura)" (PDF). Molecular Phylogenetics and Evolution. 12 (2): 186–199. doi:10.1006/mpev.1998.0608. PMID 10381321.
  4. ^ Carrie E. Schweitzer & Rodney M. Feldmann (2000). "Re-evaluation of the Cancridae Latreille, 1802 (Decapoda: Brachyura) including three new genera and three new species". Contributions to Zoology. 69 (4): 223–250. doi:10.1163/18759866-06904002. Archived from the original on 2012-12-09. Retrieved 2010-10-17. Also available as PDF.

External links[edit]


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