Adianthids were actively mobile herbivores. They were small in size when compared to most litopterns. Most species did not exceed the size of a cat. Although small in size, the adianthids showed dental features that were already specialized even in the Oligocene genera. The molars were equipped with ridges, and the upper molars were provided with crescent-shaped metacones and paracones, with a columnar parastyle and a very reduced or absent mesostyle. The lower fourth premolar was provided with a crested talonid, and the lower molars were double crescent-shaped or nearly so. The upper fourth premolar was molar-shaped, and the teeth from the third premolar to the upper third molar had three primary dimples and (in the more derived forms) a few accessory dimples behind the prostylar cingulum in front of the cingulum of the postipocone.[1][2][3]
Naming and reorganizationedit
Adianthidae was named by Florentino Ameghino in 1891. It was renamed to Adiantidae by Jaekel in 1911 which is used comparatively less but is synonymous (not disputed). It was reranked to a subfamily Adiantinae by Bordas in 1939.
It was assigned to Litopterna (renamed by Jaekel in the same year from Litopterna) by Jaekel in 1911, to Macraucheniidae by Bordas in 1939 and to Macrauchenioidea by Cifelli in 1983 and to Litopterna by Ameghino in 1894 and 1897, by Simpson et al. in 1962, by Cifelli and Soria in 1983, by Bond and Vucetich in 1983 and by Carroll in 1988.[3]
Referencesedit
^Ameghino, Florentino (1891). "Caracteres diagnósticos de cincuenta especies nuevas de mamíferos fósiles argentinos". Revista Argentina de Historia Natural. 1 (3): 129–167.
^Cifelli, Richard; Soria, Miguel Fernando (1983). "Systematics of the Adianthidae (Litopterna, Mammalia)". American Museum Novitates (2771): 1–25. hdl:2246/5255.
adianthidae, extinct, family, litopterns, that, existed, from, middle, eocene, mustersan, early, miocene, santacrucian, temporal, range, eocene, miocene, preꞒ, scientific, classification, domain, eukaryota, kingdom, animalia, phylum, chordata, class, mammalia,. Adianthidae is an extinct family of litopterns that existed from the Middle Eocene Mustersan to the Early Miocene Santacrucian AdianthidaeTemporal range Eocene Miocene 48 16 Ma PreꞒ Ꞓ O S D C P T J K Pg N Scientific classification Domain Eukaryota Kingdom Animalia Phylum Chordata Class Mammalia Order Litopterna Superfamily Macrauchenioidea Family AdianthidaeAmeghino 1891 Genera Adianthus Proadiantus Proectocion Proheptaconus TricoelodusDescription editAdianthids were actively mobile herbivores They were small in size when compared to most litopterns Most species did not exceed the size of a cat Although small in size the adianthids showed dental features that were already specialized even in the Oligocene genera The molars were equipped with ridges and the upper molars were provided with crescent shaped metacones and paracones with a columnar parastyle and a very reduced or absent mesostyle The lower fourth premolar was provided with a crested talonid and the lower molars were double crescent shaped or nearly so The upper fourth premolar was molar shaped and the teeth from the third premolar to the upper third molar had three primary dimples and in the more derived forms a few accessory dimples behind the prostylar cingulum in front of the cingulum of the postipocone 1 2 3 Naming and reorganization editAdianthidae was named by Florentino Ameghino in 1891 It was renamed to Adiantidae by Jaekel in 1911 which is used comparatively less but is synonymous not disputed It was reranked to a subfamily Adiantinae by Bordas in 1939 It was assigned to Litopterna renamed by Jaekel in the same year from Litopterna by Jaekel in 1911 to Macraucheniidae by Bordas in 1939 and to Macrauchenioidea by Cifelli in 1983 and to Litopterna by Ameghino in 1894 and 1897 by Simpson et al in 1962 by Cifelli and Soria in 1983 by Bond and Vucetich in 1983 and by Carroll in 1988 3 References edit Ameghino Florentino 1891 Caracteres diagnosticos de cincuenta especies nuevas de mamiferos fosiles argentinos Revista Argentina de Historia Natural 1 3 129 167 Cifelli Richard Soria Miguel Fernando 1983 Systematics of the Adianthidae Litopterna Mammalia American Museum Novitates 2771 1 25 hdl 2246 5255 a b PBDB paleobiodb org Retrieved 2022 11 15 Retrieved from https en wikipedia org w index php title Adianthidae amp oldid 1169807227, wikipedia, wiki, book, books, library,
