Superregnum: Eukaryota
Cladus: Unikonta
Cladus: Opisthokonta
Cladus: Holozoa
Regnum: Animalia
Subregnum: Eumetazoa
Cladus: Bilateria
Cladus: Nephrozoa
Superphylum: Deuterostomia
Phylum: Chordata
Subphylum: Vertebrata
Infraphylum: Gnathostomata
Megaclassis: Osteichthyes
Cladus: Sarcopterygii
Cladus: Rhipidistia
Cladus: Tetrapodomorpha
Cladus: Eotetrapodiformes
Cladus: Elpistostegalia
Superclassis: Tetrapoda
Cladus: Reptiliomorpha
Cladus: Amniota
Cladus: Synapsida
Cladus: Eupelycosauria
Cladus: Sphenacodontia
Cladus: Sphenacodontoidea
Cladus: Therapsida
Cladus: Theriodontia
Cladus: Cynodontia
Cladus: Eucynodontia
Cladus: Probainognathia
Cladus: Prozostrodontia
Cladus: Mammaliaformes
Classis: Mammalia
Subclassis: Trechnotheria
Infraclassis: Zatheria
Supercohors: Theria
Cohors: Eutheria
Infraclassis: Placentalia
Cladus: Boreoeutheria
Superordo: Laurasiatheria
Cladus: Scrotifera
Cladus: Ferungulata
Cladus: Euungulata
Ordo: Artiodactyla
Cladus: Artiofabula
Cladus: Cetruminantia
Subordo: Whippomorpha
Infraordo: Cetacea
Cladus: Neoceti
Parvordo: Odontoceti
Infraordo: Platanistida
Superfamilia: Platanistoidea
Familia: †Allodelphinidae
Genera: †Allodelphis – †Arktocara – †Goedertius – †Ninjadelphis – †Zarhinocetus
Name
Allodelphinidae Barnes, 2006
Type genus: Allodelphis
References
Primary references
Barnes, L.G. 2006. A phylogenetic analysis of the superfamily Platanistoidea (Mammalia, Cetacea, Odontoceti). Beiträge zur Paläontologie 30: 25–42. Reference page.
Links
Allodelphinidae – Taxon details on Fossilworks.
Vernacular names
日本語: アロデルフィス科
Allodelphinidae is a family of primitive platanistoid river dolphins found in marine deposits in the eastern North Pacific region, Alaska, and Japan.[1][2]
Description
Kimura and Barnes (2016, pp. 3–4) diagnose the family as follows:
A family of the odontocete superfamily Platanistoidea including relatively large dolphinlike odontocetes having estimated adult total body lengths of approximately three to five meters, cranial lengths of approximately one meter, having cranium with elongate and narrow rostrum, rostral length approximately four times braincase length, premaxillae and maxillae both reaching anterior rostral extremity, premaxillae and maxillae fused together distally, mesorostral canal open dorsally only in posterior part of rostrum, anteroposteriorly elongated groove present on lateral side of rostrum approximately following maxilla-premaxilla suture, posterior maxillary foramen located posterolateral to dorsal naris and not close to posterior end of premaxilla, posterolateral sulcus and posteromedial sulcus on premaxilla shallow or absent, posterior ends of premaxillae separating from lateral sides of corresponding nasal bones, posterior ends of premaxillae relatively thin dorsoventrally and narrow (not expanded transversely), nasal bones small and narrow transversely, nuchal crest thick anteroposteriorly, lateral lamina of pterygoid forming bony plate extending posteriorly from palate and contacting anterior falciform process of squamosal, palatine bone extending posteriorly from palate dorsal to lateral lamina of pterygoid, forming part of bony plate within orbit, and also contacting anterior falciform process of squamosal, preorbital lobe of pterygoid sinus absent, postorbital lobe of pterygoid sinus absent, posterior sinus not present in anterior surface of paroccipital process; internal acoustic meatus of the petrosal opening anteromedially, superior process of the petrosal wide, smooth and almost flattened, posterior process of the petrosal atrophied; tympanic bulla with elongated and pointed anterior process, outer lip inflated and with smooth ventral surface; mandible with transversely narrow symphyseal portion, anteroposteriorly elongated and somewhat compressed dorsoventrally, mandibular symphysis very long and firmly ankylosed, elongate sulcus present on lateral surface of symphyseal part of dentary; all teeth single rooted, crowns tall and slender; neck relatively long with cervical vertebrae proportionally large and with anteroposteriorly elongated centra, atlas vertebra bearing separate dorsal and ventral transverse processes, axis vertebra with relatively large odontoid process; caudal vertebrae enlarged; humerus with diaphysis proximodistally elongated and oval in cross section, humeral head proportionally large; propensity for distal trochlea of humerus to fuse to olecranon process of ulna; radius and ulna equal to or less than length of humerus.[3]
Systematics
Allodelphis and Zarhinocetus were formerly classified as members of Delphinidae and Squalodontidae in the original descriptions.[4][5] In his overview of eastern North Pacific marine mammal assemblages, Lawrence Barnes noted that these two genera did not belong in those families and reassigned Allodelphis to Platanistidae, while removing Squalodon errabundus from Squalodon.[6] Barnes later realized that Allodelphis was more primitive than extinct members of Platanistidae and Squalodelphinidae and placed it and "S." errabundus in a separate family, Allodelphinidae.[7]
References
"Fossilworks: Allodelphinidae".
Boersma, A. T.; Pyenson, N. D. (2016). "Arktocara yakataga, a new fossil odontocete (Mammalia, Cetacea) from the Oligocene of Alaska and the antiquity of Platanistoidea". PeerJ. 4: e2321. doi:10.7717/peerj.2321. PMC 4991871. PMID 27602287.
Kimura, T.; Barnes, L. G. (2016). "New Miocene fossil Allodelphinidae (Cetacea, Odontoceti, Platanistoidea) from the North Pacific Ocean". Bulletin of the Gunma Museum of Natural History. 20: 1–58.
Wilson, L. E. (1935). "Miocene marine mammals from the Bakersfield region, California". The Peabody Museum of Natural History Bulletin. 4: 1–143.
Kellogg, R. (1931). "Pelagic mammals of the Temblor Formation of the Kern River region, California". Proceedings of the California Academy of Sciences. 19 (12): 217–397.
Barnes, L. G. (1977). "Outline of eastern North Pacific fossil cetacean assemblages". Systematic Zoology. 25 (4): 321–343. doi:10.2307/2412508. JSTOR 2412508.
Barnes, L. G. (2006). "A phylogenetic analysis of the superfamily Platanistoidea (Mammalia, Cetacea, Odontoceti)". Beiträge zur Paläontologie. 30: 25–42.
Retrieved from "http://en.wikipedia.org/"
All text is available under the terms of the GNU Free Documentation License
