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Protoglobicephala mexicana

Mammalia - Artiodactyla - Delphinidae

Taxonomy
Protoglobicephala mexicana was named by Aguirre-Fernández et al. (2009). Its type specimen is UABCS/ISJ/3008, a partial skull, and it is a 3D body fossil. Its type locality is Los Placeritos, which is in a Piacenzian transition zone/lower shoreface sandstone in Mexico.

Synonymy list
YearName and author
2009Protoglobicephala mexicana Aguirre-Fernández et al.
2014Protoglobicephala mexicana Murakami et al. p. 492 figs. Table 1

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RankNameAuthor
kingdomAnimalia()
Triploblastica
Nephrozoa
Deuterostomia
phylumChordataHaeckel 1847
subphylumVertebrata
superclassGnathostomata
Osteichthyes()
Sarcopterygii
subclassDipnotetrapodomorpha(Nelson 2006)
subclassTetrapodomorpha()
Tetrapoda()
Reptiliomorpha
Anthracosauria
Batrachosauria()
Cotylosauria()
Amniota
Synapsida()
Therapsida()
RankNameAuthor
infraorderCynodontia()
Epicynodontia
infraorderEucynodontia
Probainognathia
Mammaliamorpha
Mammaliaformes
classMammalia
orderArtiodactyla()
Cetacea()
Pelagiceti
Neoceti
Odontoceti()
infraorderDelphinida
superfamilyDelphinoidea
familyDelphinidae
subfamilyGlobicephalinae()
genusProtoglobicephala
speciesmexicana

If no rank is listed, the taxon is considered an unranked clade in modern classifications. Ranks may be repeated or presented in the wrong order because authors working on different parts of the classification may disagree about how to rank taxa.

Diagnosis
ReferenceDiagnosis
G. Aguirre-Fernández et al. 2009Medium sized odontocete cetacean with relatively short and broad rostrum, 10 teeth in each maxilla; referred to superfamily Delphinoidea because nasal bones are short and blocky and do not overhang nares, lateral lamina of pterygoid does not form a complete bony wall within orbital area, vomer is exposed in anterior part of palate, premaxillae have reduced palatal exposure anterior to palatal exposure of vomer, petrosal has short posterior process, tympanic bulla lacks anterior process, and teeth are homodont; referred to family Delphinidae because nasal bones are convex and form highest part of cranial vertex, posterior end of left premaxilla is significantly narrower and shorter than right premaxilla, posterior end of left premaxilla has reduced contact with anterolateral corner of left nasal, no premaxillary eminence is present anterior to nares; referred to subfamily Globicephalinae because rostrum is relatively broad, premaxillae are wide and occupy major part of dorsal surface of rostrum, antorbital process is large and rounded in dorsal view, tooth numbers are reduced; differing from all other genera of Globicephalinae by having proportionally longer rostrum, greater medial extension of posterior ends of right maxilla and premaxilla, and proportionally larger premaxillary sac fossae; resembling Globicephala by having wider dorsal surfaces of premaxillae on rostrum than maxillae, rugosities present on dorsal surface of anterior part of premaxilla, and facial surface of cranium extended posteriorly so that occipital shield is nearly vertical and not extensively visible in dorsal view; and differing from Globicephala by being smaller, having proportionally narrower cranium and longer and narrower rostrum, narrower dorsal exposures of premaxillae on rostrum, more convex dorsal surface of rostrum in anterior part, proportionally larger premaxillary sac fossae, greater medial expansion of posterior end of right premaxilla toward cranial vertex, more teeth, and teeth of smaller diameter. Near their anterior ends, the dorsal surfaces of the premaxillae are arched prominently, and they are elevated along their medial margins adjoining the mesorostral gutter. These features are both autapomorphies of this genus.