A review of monotreme (Monotremata) evolution

  title={A review of monotreme (Monotremata) evolution},
  author={Tim Fridtjof Flannery and Thomas H. Rich and Pat Vickers-Rich and Tim Ziegler and Elizabeth G. Veatch and Kristofer M. Helgen},
  journal={Alcheringa: An Australasian Journal of Palaeontology},
  pages={3 - 20}
  • T. FlanneryT. Rich K. Helgen
  • Published 2 January 2022
  • Environmental Science
  • Alcheringa: An Australasian Journal of Palaeontology
Abstract Advances in dating and systematics have prompted a revision of monotreme evolution to refine the timing of adaptative trends affecting body size and craniodental morphology. The oldest known monotreme, Teinolophos trusleri, is restricted to uppermost Barremian deposits of the Strzelecki Group in Victoria, Australia. Its body mass is estimated at ∼40 g, making it the smallest known monotreme. Teinolophos trusleri likely possessed an electro-sensitive and/or mechano-sensitive ‘bill’ or… 

The Gondwanan Origin of Tribosphenida (Mammalia)

Abstract A review of the Southern Hemisphere Mesozoic tribosphenic mammal fossil record supports the hypothesis that Tribosphenida arose in the Southern Hemisphere during the Early Jurassic, around

First monotreme from the Late Cretaceous of South America

Monotremata is a clade of egg-lying mammals, represented by the living platypus and echidnas, which is endemic to Australia, and adjacent islands. Occurrence of basal monotremes in the Early

The topography of diet: Orientation patch count predicts diet in turtles.

Use of quantitative morphological methods in biology has increased with the availability of 3D digital data. Rotated orientation patch count (OPCr) leverages such data to quantify the complexity of

Metabolic rate, sleep duration, and body temperature in evolution of mammals and birds: the influence of geological time of principal groups divergence

The main finding is that the metabolic rate in the six main groups of mammals and birds consistently increases as the geological time of the group’s divergence approaches the present.

Postural, pilo-erective and evaporative thermal windows of the short-beaked echidna (Tachyglossus aculeatus)

We identify for wild, free-living short-beaked echidnas (Tachyglossus aculeatus) a novel evaporative window, along with thermal windows, and demonstrate the insulating properties of the spines, using

Gaze following: A socio-cognitive skill rooted in deep time

It is proposed that the foundations of gaze following emerged early in evolutionary history and might have already evolved in fishes, which would explain the ubiquity of gazeFollowing seen in the amniotes.

A new Nell Ludbrook Special Review

  • B. Kear
  • Art
    Alcheringa: An Australasian Journal of Palaeontology
  • 2022
Benjamin P. Kear [ benjamin.kear@em.uu.se ] , Museum of Evolution, Uppsala University, Uppsala, 752 36, Sweden.



Review of the monotreme fossil record and comparison of palaeontological and molecular data.

  • A. Musser
  • Environmental Science
    Comparative biochemistry and physiology. Part A, Molecular & integrative physiology
  • 2003

First Mesozoic mammal from Australia—an early Cretaceous monotreme

Here we describe Australia's first known Mesozoic mammal and the first known early Cretaceous mammal from Gondwanaland. Steropodon galmani n. gen. and sp., discovered in early Cretaceous sediments at

New data on the Paleocene monotreme Monotrematum sudamericanum, and the convergent evolution of triangulate molars

We describe an additional fragmentary upper molar and the first lower molar known of Monotrematum sudamericanum, the oldest Cenozoic (Paleocene) monotreme. Comparisons suggest that the monotreme

A new family of monotremes feom the Creataceous of Australia

With four families now known from Australia, it is probable that monotremes originated and diversified in the Australian/Antarctic sector of Gondwana, followed by a single dispersal to the South American sector before or during the early Paleocene.

A Jurassic mammal from South America

The discovery of a Jurassic mammal represented by a dentary, which is the first, to the authors' knowledge, from South America, indicates that the Australosphenida had diversified and were widespread in Gondwanaland well before the end of the Jurassic, and that mammalian faunas from the Southern Hemisphere already showed a marked distinction from their northern counterparts by the Middle to Late Jurassic.

The oldest platypus and its bearing on divergence timing of the platypus and echidna clades

Evidence from high-resolution x-ray computed tomography indicating that Teinolophos, an Early Cretaceous fossil from Australia's Flat Rocks locality, lies within the crown clade Monotremata, as a basal platypus is described, suggesting that rate heterogeneities may have affected mammalian evolution in such a way as to defeat strict molecular clock models and to challenge even relaxed molecular Clock models when applied to mammalian history at a deep temporal scale.

In quest for a phylogeny of Mesozoic mammals

A phylogeny of all major groups of Mesozoic mammals based on phylogenetic analyses of 46 taxa and 275 osteological and dental characters, using parsimony methods is proposed, suggesting that the “obtuse−angle symmetrodonts” are paraphyletic, and that they lack reliable and unambiguous synapomorphies.

Dual origin of tribosphenic mammals

Phylogenetic and morphometric analyses including these newly discovered taxa suggest a different interpretation: that mammals with tribosphenic molars are not monophyletic.

A Middle Jurassic mammal from Madagascar

The lower molars of tribosphenic mammals (marsupials, placentals and their extinct allies) are marked, primitively, by a basined heel (talonid) acting as the mortar to the pestle of a large inner