User:Macrophyseter/sandbox2

Macrophyseter/sandbox2; Temporal range: Albian-Maastrichtian, 109.56–66.0 Ma PreꞒ Ꞓ O S D C P T J K Pg N
	Squalicorax pristodontus tooth from Khouribga, Morocco
Scientific classification
Domain:	Eukaryota
Kingdom:	Animalia
Phylum:	Chordata
Class:	Chondrichthyes
Subclass:	Elasmobranchii
Subdivision:	Selachimorpha
Order:	Lamniformes
Family:	†Anacoracidae
Genus:	†Squalicorax; Whitley, 1939
Type species
	†Corax pristodontus; Agassiz, 1835
Species
	List of species †S. pristodontus Agassiz, 1835 (type); †S. appendiculatus Agassiz, 1839; †S. falcatus Agassiz, 1843 †S. falcatus praecursor Sokolov, 1978; ; †S. kaupi Agassiz, 1843; †S. heterodon Reuss, 1845; †S. obliquus Reuss, 1845 †S. obliquus subserratus Glückman, 1980; ; †S. lindstromi Davis, 1890; †S. curvatus Williston, 1900; †S. bassanii Gemmellaro, 1920; †S. baharijensis Stromer, 1927; †S. primaevus Dalinkevicius, 1935; †S. kugleri Leriche, 1938; †S. yangaensis Carteville & Casier, 1943; †S. dalinkevichiusi Glückman & Shvazhaite, 1971; †S. mississippiensis Glückman, 1971; †S. volgensis Glückman, 1971; †S. obruchevi Glückman, 1980; †S. sagisicus Glückman, 1980; †S. santonicus Glückman & Zhelezko, 1980; †S. papulovi Zhelezko, 1980; †S. africanus Cappetta, 1991; †S. primigenius Landemaine, 1991; †S. coquandi Vullo et al., 2007; †S. priscoserratus Siversson et al., 2007; †S. bernardezi Guinot et al., 2013; †S. benguerirensis Cappetta et al., 2014; †S. microserratus Cappetta et al., 2014; †S. deckeri Bice & Shimada, 2016; †S. lalunaensis Guinot & Carrillo-Briceño, 2018; †S. moodyi Guinot & Carrillo-Briceño, 2018; †S. acutus Siversson et al., 2019; †S. bazzii Siversson et al., 2019; †S. mutabilis Siversson et al., 2019; ;

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Squalicorax is a genus of extinct lamniform shark known to have lived during the Cretaceous period.

Description edit

Teeth edit

Anatomy edit

Taxonomy and evolution edit

Taxonomic history edit

Carcharhiniform or lamniform? edit

The ambiguous characteristics of Squalicorax have led to a confusion about which shark order the genus belongs to, and to this day there remains no full certainty on the issue. Historically, scientists have suggested a placement of Squalicorax within one of four orders: the cow sharks (Hexanchiformes), the carpet sharks (Orectolobiformes), the ground sharks (Carcharhiniformes), or the mackerel sharks (Lamniformes). The first two were suggested based on the similarities of the teeth of some Squalicorax species with modern members of those orders, as well as the purported presence of skull features that are exclusive to them. The study of Squalicorax skeletons by Shimada & Cicimurri (2005) ruled out these placements by identifying a number of contradicting anatomical features.

Phylogeny edit

S. volgensis

S. curvatus

S. falcatus

	S. kaupi

	S. pristodontus

Possible phylogenetic relationships between Squalicorax species from North America based on Shimada & Cicimurri, 2006^[3]

Paleobiology edit

Diet edit

Feeding dynamics edit

Paleoecology edit

Range and distribution edit

Habitat edit

Competition edit

Notes edit

References edit

^ Ogg, J.G.; Hinnov, L.A. (2012). Cretaceous. pp. 793–853. doi:10.1016/B978-0-444-59425-9.00027-5. ISBN 9780444594259. {{cite book}}: |journal= ignored (help)
^ Smart, P.J. (2007). "Anacoracid shark teeth (Chondrichthyes, Vertebrata) from the early Cretaceous Albian sediments of Leighton Buzzard, south-central England". Proceedings of the Geologists' Association. 118 (4): 375–380. doi:10.1016/s0016-7878(07)80005-8.
^ Shimada, K.; Cicimurri, S. (2006). "The oldest record of the Late Cretaceous anacoracid shark, Squalicorax pristodontus (Agassiz), from the Western Interior, with comments on Squalicorax phylogeny". New Mexico Museum of Natural History and Science Bulletin. 35: 177–184.

External links edit

[GeologicTime-1] Ogg, J.G.; Hinnov, L.A. (2012). Cretaceous. pp. 793–853. doi:10.1016/B978-0-444-59425-9.00027-5. ISBN 9780444594259. {{cite book}}: |journal= ignored (help)

[Smart2007-2] Smart, P.J. (2007). "Anacoracid shark teeth (Chondrichthyes, Vertebrata) from the early Cretaceous Albian sediments of Leighton Buzzard, south-central England". Proceedings of the Geologists' Association. 118 (4): 375–380. doi:10.1016/s0016-7878(07)80005-8.

[ShimadaCicimurriPhylogeny-3] Shimada, K.; Cicimurri, S. (2006). "The oldest record of the Late Cretaceous anacoracid shark, Squalicorax pristodontus (Agassiz), from the Western Interior, with comments on Squalicorax phylogeny". New Mexico Museum of Natural History and Science Bulletin. 35: 177–184.

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Macrophyseter/sandbox2 Temporal range: Albian-Maastrichtian, 109.56–66.0 Ma PreꞒ Ꞓ O S D C P T J K Pg N ^[1]^[2]

Squalicorax pristodontus tooth from Khouribga, Morocco
Scientific classification
Domain:	Eukaryota
Kingdom:	Animalia
Phylum:	Chordata
Class:	Chondrichthyes
Subclass:	Elasmobranchii
Subdivision:	Selachimorpha
Order:	Lamniformes
Family:	†Anacoracidae
Genus:	†Squalicorax Whitley, 1939
Type species
†Corax pristodontus Agassiz, 1835
Species
List of species †S. pristodontus Agassiz, 1835 (type) †S. appendiculatus Agassiz, 1839 †S. falcatus Agassiz, 1843 †S. falcatus praecursor Sokolov, 1978 †S. kaupi Agassiz, 1843 †S. heterodon Reuss, 1845 †S. obliquus Reuss, 1845 †S. obliquus subserratus Glückman, 1980 †S. lindstromi Davis, 1890 †S. curvatus Williston, 1900 †S. bassanii Gemmellaro, 1920 †S. baharijensis Stromer, 1927 †S. primaevus Dalinkevicius, 1935 †S. kugleri Leriche, 1938 †S. yangaensis Carteville & Casier, 1943 †S. dalinkevichiusi Glückman & Shvazhaite, 1971 †S. mississippiensis Glückman, 1971 †S. volgensis Glückman, 1971 †S. obruchevi Glückman, 1980 †S. sagisicus Glückman, 1980 †S. santonicus Glückman & Zhelezko, 1980 †S. papulovi Zhelezko, 1980 †S. africanus Cappetta, 1991 †S. primigenius Landemaine, 1991 †S. coquandi Vullo et al., 2007 †S. priscoserratus Siversson et al., 2007 †S. bernardezi Guinot et al., 2013 †S. benguerirensis Cappetta et al., 2014 †S. microserratus Cappetta et al., 2014 †S. deckeri Bice & Shimada, 2016 †S. lalunaensis Guinot & Carrillo-Briceño, 2018 †S. moodyi Guinot & Carrillo-Briceño, 2018 †S. acutus Siversson et al., 2019 †S. bazzii Siversson et al., 2019 †S. mutabilis Siversson et al., 2019