PBDB Taxon

Basic info	Taxonomic history	Classification	Included Taxa
Morphology	Ecology and taphonomy	External Literature Search	Age range and collections

Acyon tricuspidatus

Mammalia - Sparassodonta

Taxonomy

Acyon tricuspidatus was named by Ameghino (1887). Its type specimen is MLP 11-64, a mandible (right mandibular ramus in two parts, anterior with root of c, alveoli of p1-2; posterior with p3-m4 all present but partially broken), and it is a 3D body fossil. Its type locality is Monte León, which is in a Santacrucian terrestrial horizon in the Santa Cruz Formation of Argentina. It is the type species of Acyon.

It was synonymized subjectively with Cladosictis defossa by Marshall (1978); it was synonymized subjectively with Anatherium defossus by Marshall (1981).

Synonyms

Anatherium herrerae was named by Marshall (1981). Its type specimen is FMNH P13521, a mandible (associated left and right mandibular rami with bases of cs, and p1-m4 (tips of right p1-2 and protoconids of right m3 and left m3-4 missing)), and it is a 3D body fossil. Its type locality is Gran Barranca - southern cliff of lake Colhué Huapí, which is in a Colhuehuapian terrestrial horizon in the Sarmiento Formation of Argentina.

It was synonymized subjectively with Acyon tricuspidatus by Forasiepi et al. (2006).
Ictioborus destructor was named by Ameghino (1894) [title: Enumeracion synoptique des especes de mammiferes fossiles des formaciones eocenes de Patagonie]. Its type specimen is MACN 5988, a mandible (fragment of right mandibular ramus with posterior root of p1, roots of p2-3, m1-2 complete but very, very worn), and it is a 3D body fossil. Its type locality is Shehuén, which is in a Santacrucian terrestrial horizon in the Santa Cruz Formation of Argentina.

It was synonymized subjectively with Cladosictis defossa by Marshall (1978); it was synonymized subjectively with Anatherium defossus by Marshall (1981); it was synonymized subjectively with Acyon tricuspidatus by Forasiepi et al. (2006).

Synonymy list

Year	Name and author
1887	Acyon tricuspidatus Ameghino p. 8
1894	Acyon tricuspidatus Ameghino p. 141
1894	Ictioborus destructor Ameghino p. 396
1981	Anatherium herrerae Marshall p. 103 figs. 72, 73
2006	Acyon tricuspidatus Forasiepi et al.

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Rank	Name	Author
kingdom	Animalia	()
—	Bilateria
—	Eubilateria	Ax 1987
—	Deuterostomia
phylum	Chordata	Haeckel 1874
subphylum	Vertebrata
superclass	Gnathostomata
—	Osteichthyes	()
subclass	Sarcopterygii	()
subclass	Dipnotetrapodomorpha	(Nelson 2006)
subclass	Tetrapodomorpha	()
—	Tetrapoda
—	Reptiliomorpha
—	Anthracosauria
subclass	Amphibiosauria	Kuhn 1967
—	Cotylosauria	()
—	Amniota

Rank	Name	Author
subclass	Synapsida
—	Therapsida	()
infraorder	Cynodontia	()
—	Mammaliamorpha
—	Mammaliaformes
class	Mammalia
—	Cladotheria
—	Zatheria
subclass	Tribosphenida	()
subclass	Theria
subclass	Metatheria	()
—	Marsupialiformes
order	Sparassodonta	()
subfamily	Hathlyacininae	()
genus	Acyon	Ameghino 1887
species	tricuspidatus	Ameghino 1887

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.

†Acyon tricuspidatus Ameghino 1887

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Invalid names: Anatherium herrerae Marshall 1981 [synonym], Ictioborus destructor Ameghino 1894 [synonym]

Diagnosis

No diagnoses are available

Measurements

No measurements are available

Composition:

phosphaticsubp

Environment:

terrestrialsubo

Locomotion:

actively mobilec

Life habit:

scansorialsubc

Diet:

carnivoresubo

Reproduction:

viviparoussubc

Created:

2013-05-24 23:51:13

Modified:

2013-05-24 08:51:13

Source: subo = suborder, subc = subclass, c = class, subp = subphylum

References: Clemens 1979, Goin 1997, Lillegraven 1979, Hendy et al. 2009, Carroll 1988

Age range: base of the Colhuehuapian to the top of the Santacrucian or 21.00000 to 16.30000 Ma

Collections (5 total)

Time interval	Ma	Country or state	Original ID and collection number
Colhuehuapian	21.0 - 17.5	Argentina (Chubut)	Anatherium herrerae (141368)
Santacrucian	17.5 - 16.3	Argentina (Santa Cruz)	Acyon tricuspidatus (27313 type locality: 176563 176593) Ictioborus destructor (176594)