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Mammalodon

Mammalia - Artiodactyla - Mammalodontidae

Synonymy list
YearName and author
1939Mammalodon Pritchard pp. 151-159 figs. Fig. 1-3
1982Mammalodon Fordyce p. 424
2001Mammalodon Fordyce and de Muizon p. 176
2002Mammalodon Sepkoski, Jr.
2003Mammalodon Geisler and Sanders p. 27
2004Mammalodon Fitzgerald p. 206
2007Mammalodon Steeman p. 880 figs. Table 1
2010Mammalodon Fitzgerald p. 370 figs. Table 1
2011Mammalodon Geisler et al. p. 6 figs. Table 1
2015Mammalodon Boessenecker and Fordyce figs. Table 1
2015Mammalodon Marx and Fordyce figs. Figure 2
2016Mammalodon Fordyce and Marx p. 108
2016Mammalodon Marx et al. p. 104
2017Mammalodon Berta p. 166
2018Mammalodon Fordyce and Marx p. 5 figs. Fig. 4

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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
RankNameAuthor
Synapsida()
Therapsida()
infraorderCynodontia()
Epicynodontia
infraorderEucynodontia
Probainognathia
Mammaliamorpha
Mammaliaformes
classMammalia
orderArtiodactyla()
Cetacea()
Pelagiceti
Neoceti
Mysticeti()
familyMammalodontidae
genusMammalodon

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
E. M. G. Fitzgerald 2010Emended diagnosis of Mammalodon colliveri: Mammalodon colliveri is a mammalodontid mysticete distinguished from J. hunderi by the following autapomorphic characters: rostrum has a bluntly rounded apex; viewed dorsally, the rostrum has a gently convex lateral profile; alveoli for the upper incisors are coa- lesced; body of the premaxilla is gracile and foreshortened; premaxilla is dorsoventrally flattened; nasal expands in width towards its anterior end; five dorsal infraorbital foramina in facial fossa; ascending process of the maxilla is transversely narrow and linguiform; posterior edge of the ascending process of maxilla lies in transverse line with the posterior edge of the nasal; orbit directed further anteriorly and anterodorsally; anteriormost point on the posterior edge of the supraorbital process of the frontal is laterally positioned; in cross-section, the parietals have a gently convex dorsal profile, with no salient sagittal crest along the midline of the braincase; nuchal crest projects anterodorsally and anterolaterally; alisphe- noid forms most of the roof of the pterygoid sinus fossa, with the superior lamina of the pterygoid limited to the anteromedial corner of the sinus fossa; involucrum of the tympanic bulla bears a transverse groove on its dorsal surface, which divides it into a wider posterior part and a narrower anterior one; in dorsal or ventral view the mandible is straight; body of the mandible is relatively gracile; mental foramina relatively large; and three upper and four lower molars present (i.e. polydont lower dentition).
R. E. Fordyce and F. G. Marx 2016Small-sized mysticetes differing from chaeomysticetes in having teeth. Differ from all
toothed mysticetes except Janjucetus in having a foreshortened, dorsoventrally tall rostrum, a linguiform anterior border of the supraorbital process, a triangular wedge of the frontal separating the ascending process of maxilla from the posterolateral margin of the nasal, a roughly horizontal dorsal pro le of the braincase (relative to the lateral edge of the rostrum) and posteriorly reclined mandibular cheek teeth; further differ from all other toothed mysticetes except Janjucetus and Chonecetus in having a distinctly V-shaped fronto-parietal suture in dorsal view; from Llanocetus and two previously coded, undescribed archaic mysticetes (ChM PV4745; OU GS10897) in having both relatively and absolutely smaller posterior cheek teeth with proximally fused roots, and an inner posterior prominence of the tympanic bulla that is subequal to the outer prominence in posterior view; from all aetiocetids in having a more elongate intertemporal region and an anteroposteriorly broader coronoid process of the mandible; from Aetiocetus and Fucaia in lacking a medially expanded lacrimal and a dorsoventrally constricted mandible, and in having more robust cheek teeth with distally separate roots; from Chonecetus in having a broader, less anteriorly-thrust supraoccipital bearing a well-developed external occipital crest, and in lacking a parasagittal cleft on the dorsal surface of the parietal; from Aetiocetus in having a clearly heterodont dentition and closely-spaced posterior cheek teeth with well-developed enamel ridges on both the labial and lingual sides of the crown; from Morawanocetus in having a much more robust postorbital process of the frontal; from Ashorocetus in having a less steeply inclined supraoccipital shield and a somewhat more anteromedially oriented basioccipital crest; and from the enigmatic Willungacetus in having a clearly marked orbitotemporal crest extending posteriorly on to the intertemporal constriction and a rounded (rather than triangular), less anteriorly-thrust supraoccipital bearing a well-developed external occipital crest. Finally, Mammalodon differs from the only other described mammalodontid, Janjucetus, in having a rostrum with a bluntly rounded apex and a gently convex lateral pro le in dorsal view, coalesced alveoli for the upper incisors, a gracile, foreshortened and dorsoventrally attened premaxilla, an anteriorly expanded nasal, a transversely narrow, linguiform ascending process of the maxilla extending posteriorly as far as the nasal, a more anteriorly directed orbit, a more laterally oriented postorbital process, a transversely convex dorsal pro le of the parietals with no salient sagittal crest, a more laterally oriented nuchal crest, a broadly rounded apex of the supraoccipital shield in dorsal view, an anterior portion of the tympanic bulla that is squared (rather than obliquely truncated) in ventral view, an inner posterior prominence of the tympanic bulla that is subequal to the outer prominence in posterior view, a straight and comparatively gracile mandible bearing large mental foramina, and three upper and four lower molars, all of which (at least in adult specimens) are affected by heavy occlusal wear.
Measurements
No measurements are available
Composition: hydroxyapatitesubo
Form: roller-shapedo
Ontogeny: modification of partso
Environment: marinesubo
Locomotion: actively mobileo
Life habit: aquaticsubo
Depth habitat: surfaceo
Diet: carnivoresubo
Diet 2: suspension feedersubo
Reproduction: viviparouso
Created: 2005-03-06 14:20:41
Modified: 2005-03-06 16:34:40
Source: subo = suborder, o = order
Reference: Uhen 2004

Age range: base of the Duntroonian to the top of the Chattian or 27.30000 to 23.03000 Ma

Collections (4 total)


Time interval Ma Country or state Original ID and collection number
Chattian28.1 - 23.03Australia (Victoria) M. new species 1, M. colliveri (48647) M. sp., M. colliveri (46166)
Duntroonian27.3 - 25.2New Zealand M. hakataramea (152358)
Waitakian25.2 - 21.7New Zealand M. sp. (74593)