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Ankonetta larriestrai

Reptilia - Anseriformes - Anatidae

Taxonomy
Ankonetta larriestrai was named by Cenizo and Agnolín (2010). It is a 3D body fossil. Its type locality is Bandurrias River, Calafate - Santa Cruz Formation, which is in a Miocene marginal marine sandstone/siltstone in the Santa Cruz Formation of Argentina.

Synonymy list
YearName and author
2010Ankonetta larriestrai Cenizo and Agnolín p. 500 figs. Figs 3A–H; 4A
2023Ankonetta larriestrai Tambussi et al. p. 268

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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
—Sauropsida
classReptilia
subclassEureptilia()
—Romeriida
—Diapsida()
—Archosauromorpha(Huene 1946)
—Crocopoda
—ArchosauriformesGauthier 1986
RankNameAuthor
—Eucrocopoda
—Archosauria()
informalAvemetatarsalia
—Ornithodira
—Dinosauromorpha
—Dinosauriformes
—Dinosauria()
—Theropoda()
—Neotheropoda
—AverostraPaul 2002
—Tetanurae
—Coelurosauria()
—Maniraptora
—Paraves
classAves
subclassNeornithesGadow 1893
—Neognathae(Pycraft 1900)
—PangalloanseraeGauthier and de Queiroz 2001
—GalloanseraeSibley and Ahlquist 1990
superorderGalloanserimorphae
orderAnseriformesWagler 1831
familyAnatidaeVigors 1825
genusAnkonetta
specieslarriestrai

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.

†Ankonetta larriestrai Cenizo and Agnolín 2010
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Diagnosis
ReferenceDiagnosis
M. M. Cenizo and F. L. Agnolín 2010Ankonetta is a mid-sized anatid that differs from remaining Anatidae, with the sole exception of Dendrocygna, in lacking a sulcus trochlearis on the distal and plantar surface of trochlea metatarsi II (see Figs 3F–H; 4A). Ankonetta differs from the latter genus in lacking a fossa para- hypotarsalis medialis. In addition, Ankonet- ta shows the following unique combination of traits among Anatidae (Figs 3A–H; 4): (1) proximal epiphysis with its proximal anteroposterior length subequal to its transverse width; (2) cotyla medialis proximo-medially projected and its medial edge weakly extended proximally; (3) lateral margin of proximal shaft strongly convex; (4) hypotarsus transversely compressed and located laterally with respect to the mid-length of the shaft; (5) eminentia intercotylaris massive and subquadrangu- lar in outline; (6) fossa infracotylaris deep and narrow; (7) lateral rim of trochlea metatarsi II very wide, forming a bulbous lobe along its dorsal surface; (8) proximo- medial corner of medial rim of trochlea metatarsi II in plantar view well developed, but not extended proximally like a crest; (9) in distal view, parallel dorsal and plantar articular surfaces; and (10) incisura intertrochlearis medialis shallow.