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Hondadelphys fieldsi

Mammalia - Sparassodonta - Hondadelphidae

Taxonomy
Hondadelphys fieldsi was named by Marshall (1976) [Holotype- UCMP no. 37960 (Loc. V-4521, the Lone Tree Locality), partial cranium; right maxillary with alveolus for C, roots of p1, P2 complete, P3 broken, M1 complete, M2 broken, M3-4 complete; left maxillary with alveolus for C, roots of P1-2, P3 complete, M1 complete, M2 missing metacone and metastylar region, M3 complete, M4 missing stylar shelf; greater part of right mandibular ramus with alveoli for 11-4, base of C, P1 complete, posterior half of P2, alveoli for P:-M:, M2 alveoli restored, M3 missing tip of protoconid, M4 complete; greater part of left femur; proximal half of left radius; glenoid region of left scapula; greater part of atlas; one thoracic (?) vertebra, and numerous cranial and postcranial fragments representing a single young individual. Paratype-UCMP 39251]. It is considered to be a form taxon. Its type specimen is UCMP 37960, a partial skeleton, and it is a 3D body fossil. It is the type species of Hondadelphys.

Synonymy list
YearName and author
1976Hondadelphys fieldsi Marshall

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RankNameAuthor
kingdomAnimalia()
—Bilateria
—EubilateriaAx 1987
—Deuterostomia
phylumChordataHaeckel 1874
subphylumVertebrata
superclassGnathostomata
—Osteichthyes()
subclassSarcopterygii()
subclassDipnotetrapodomorpha(Nelson 2006)
subclassTetrapodomorpha()
—Tetrapoda
—Reptiliomorpha
—Anthracosauria
subclassAmphibiosauriaKuhn 1967
—Cotylosauria()
—Amniota
subclassSynapsida
RankNameAuthor
—Therapsida()
infraorderCynodontia()
—Mammaliamorpha
—Mammaliaformes
classMammalia
—Theriamorpha(Rowe 1993)
—Theriiformes()
—Trechnotheria
—Cladotheria
—Zatheria
subclassTribosphenida()
subclassTheria
subclassMetatheria()
—Marsupialiformes
orderSparassodonta()
familyHondadelphidaeMarshall et al. 1989
genusHondadelphys
speciesfieldsi

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.

†Hondadelphys fieldsi Marshall 1976
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Diagnosis
ReferenceDiagnosis
L. G. Marshall 1976Specialized didelphine, similar in size and dental specializations to Thylophorops chapalmalensis, but differing from the latter in structure of P2, in possessing weak stylar cusps B and C on M'-3, in PI roots aligned anteroposteriorly relative to upper tooth row, in weak anterior basal cingula on lower molars, in more reduced metaconid, and in structure of M4 talonid. Dentition emphasizes postvallumprevallid shear (Van Valen 1966, p. 7) yet retains and expands protocone-talonid crushing surface. Lower molars with enlarged protoconid and paraconid, metaconid reduced to vestige; trigonid compressed transversely; talonid large and deeply basined. Upper molars with large stylar shelf, large protocone, metacone twice as large as paracone, enlarged metastylar ridge. In basicranium, posterior carotid foramina large
and open completely within basioccipital; no distinct sella turcica; transverse canal absent; foramen lacerum medium (= entocarotid foramen) large; paroccipital process reduced to nubbin; mastoid process large; anterior and posterior tympanic sinuses large and subequal in size; petrosal lacks both a tympanic process and a pars mastoidea.