Mammalia

Belongs within: Mammaliaformes.Contains: Prototheria, Eutriconodonta, Multituberculata, Trechnotheria. The name ‘Mammalia’ has generally been restricted in recent years to the crown-group of mammals, i. e. the smallest possible clade including monotremes, marsupials and placentals. Mammals are distinguished from other living vertebrates by their covering of hair and the production of milk, but these features probably evolved… Continue reading Mammalia

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Categorised as Mammalia

Ptilodontoidea

Belongs within: Cimolodonta. The Ptilodontoidea are a group of multituberculate mammals known from the Upper Cretaceous to the Eocene of Eurasia and North America, characterised by a very large, arcuate lower rear premolar protruding dorsally above the level of the molars (Kielan-Jaworowska & Hurum 2001). Characters (from Kielan-Jaworowska & Hurum 2001): Dental formula 2.0.4.2/1.0.2.2; enamel… Continue reading Ptilodontoidea

Cimolodonta

Belongs within: Multituberculata.Contains: Ptilodontoidea, Djadochtatherioidea. The Cimolodonta are a group of multituberculate mammals known from the Early Cretaceous to the Eocene, including all multituberculates to survive the end of the Cretaceous (Kielan-Jaworowska & Hurum 2001). Characters (from Kielan-Jaworowska & Hurum 2001): Enamel prismatic; dental formula 2.0.1–4.2/1.0.1–2.2; I1 absent, I2 single- or two-cusped, I3 small, single-cusped;… Continue reading Cimolodonta

Eutriconodonta

Belongs within: Mammalia. The Eutriconodonta are a group of mammals known from the Jurassic and Cretaceous, characterised by triconodont molars with three laterally compressed cusps in a straight alignment (Luo et al. 2007). Synapomorphies (from Krause et al. 2014): Dens not fused to axis; lumbar ribs not fused to vertebrae; tarsal spur absent; premaxilla with… Continue reading Eutriconodonta

Mammaliaformes

Belongs within: Probainognathia.Contains: Haramiyida, Mammalia. The Mammaliaformes has been defined as the most exclusive group containing both crown mammals and Sinoconodon, and represents the broader group of animals generally considered as ‘mammals’. Sinoconodon rigneyi is known from a partial skull from the lower Jurassic of China. Synapomorphies (from Luo et al. 2002): Craniomandibular joint comprised… Continue reading Mammaliaformes

Trechnotheria

Belongs within: Mammalia.Contains: Meridiolestida, Prototribosphenida. The Trechnotheria are a clade of mammals defined as the most exclusive clade including Zhangheotherium and crown Theria, with the earliest members known from the late Jurassic. Trechnotherians are characterised by the development of a strong postvallum/prevallid shear between the upper and lower molars (Luo et al. 2002). Basal members… Continue reading Trechnotheria

Multituberculata

Belongs within: Mammalia.Contains: Paulchoffatiidae, Cimolodonta. The rise and fall of the multi-cusped Published 12 April 2011 The extinction event at the end of the Cretaceous is often seen as something of a changing of the guard: the old Mesozoic fauna was swept away, leaving the world open for the (eventual) rise of our modern Caenozoic… Continue reading Multituberculata

Prototheria

Belongs within: Mammalia.Contains: Monotremata. Insectivores: possibility of puggles Published 21 December 2009 The Australosphenida is a group of mammals that has been studied fairly extensively in recent years, which is not bad going when one considers that, at most, less than twenty species have been assigned to it and some authors are of the opinion… Continue reading Prototheria

Meridiolestida

Belongs within: Trechnotheria. The Meridiolestida are an extinct clade of mammals known from the Late Cretaceous to the Miocene of South America (Rougier et al. 2012). A little bit mole-ish in the Miocene Published 29 May 2007 Necrolestes patagonensis was a small fossorial animal from the Miocene of Patagonia that has always held a certain… Continue reading Meridiolestida