In common with reptiles and marsupials, monotremes lack the connective structure (corpus callosum) which in placental mammals is the primary communication route between the right and left brain hemispheres. (wikipedia.org)
The anterior commissure does provide an alternate communication route between the two hemispheres, though, and in monotremes and marsupials it carries all the commissural fibers arising from the neocortex, whereas in placental mammals the anterior commissure carries only some of these fibers. (wikipedia.org)
Some recent work suggests that monotremes acquired this form of molar independently of placental mammals and marsupials, although this hypothesis remains disputed. (wikipedia.org)
the presence of this symplesiomorphy suggests that the common ancestor of monotremes, marsupials, and placental mammals was oviparous, and that this trait was retained in monotremes but lost in all other extant mammal groups. (wikipedia.org)
Australia, Papua New Guinea, and eastern Indonesia together share all the monotremes (egg-laying mammals) of the world and all the marsupials (pouched mammals) except those of the Americas. (islandpress.org)
mammals whose young are born at a relatively advanced stage (more advanced than the young of other mammals, the monotremes and marsupials). (enchantedlearning.com)
Pre-Darwinian biologists encountered considerable difficulty in understanding the marsupials and monotremes because contemporary theoretical explanations had developed largely without reference to these peculiar creatures. (ku.edu)
Marsupials appear to have a number of advantages over monotremes - their bodies seem more efficient at locomotion, and the fact that they give birth to live offspring could provide better care of young. (livescience.com)
The struggle marsupials presumably had with all the animals on these continents during this journey might have primed them for competition, "while the Australian mammals [including monotremes] that went extinct upon the arrival of marsupials had for the most part been isolated in Australia for a very long time," explained researcher Matthew Phillips, an evolutionary biologist at the Australian National University in Canberra. (livescience.com)
Discover our marsupials, monotremes & macropods of the Port Campbell National Park and the 12 Apostles Coast and. (visitgreatoceanroad.org.au)
There is some debate as to whether monotremes are more closely related to marsupials, or if marsupials and placentals are more closely related to each other. (digimorph.org)
The aim of this project is to chart and closely compare fundamental cognitive mechanisms of the most ancestral mammals (monotremes and marsupials) with those that diverged more recently (placentals). (lu.se)
Extant species of monotremes2
All extant species of monotremes are indigenous to Australia and New Guinea, although they were also present in the Late Cretaceous and Paleocene of southern South America, indicating that they were also present in Antarctica, though remains have not been found there. (wikipedia.org)
Together with the four species of echidna, it is one of the five extant species of monotremes, the only mammals that lay eggs instead of giving birth to live young. (absoluteastronomy.com)
Echidnas6
The extant monotreme species are the platypus and the four species of echidnas. (wikipedia.org)
Echidnas , also known as spiny anteaters, belong to the family Tachyglossidae in the monotreme order of egg-laying mammals. (absoluteastronomy.com)
Monotremes are now restricted to Australia and New Guinea, and comprise the platypus and the echidnas [aka spiny anteaters ]. (arnoldzwicky.org)
Modern-day monotremes include the echidnas (spiny ant-eaters) and the duck-billed platypus . (enchantedlearning.com)
Now only two kinds of monotremes are left on the planet - the duck-billed platypuses and the four species of echidnas , or spiny anteaters. (livescience.com)
However, new genetic evidence and comparisons with fossil monotremes suggests that echidnas only diverged from platypuses 19 to 48 million years ago. (livescience.com)
Placental mammals1
It is still sometimes thought, for example, that the monotremes are "inferior" or quasi-reptilian, and that they are a distant ancestor of the "superior" placental mammals. (absoluteastronomy.com)
Platypus4
The duck-billed platypus ( Ornithorhyncus anatinus ) is a species of monotreme mammals which lays eggs instead of giving birth to a live young one, unlike most other mammals. (worldatlas.com)
The egg-laying mammals - the monotremes, including the platypus and spiny anteaters - are eccentric relatives to the rest of mammals, which bear live young. (livescience.com)
explained that an earlier study based on early monotreme fossils had suggested the platypus and the echidna diverged more than 110 million years ago, while the molecular data suggested a far more recent divergence. (livescience.com)
The monotremes belong to an ancient order of mammals represented by only five living species - the duckbilled platypus and four species of echidna (or spiny anteater). (earth.com)
Modern monotremes1
Tooth loss in modern monotremes might be related to their development of electrolocation. (wikipedia.org)
Species1
Nonetheless, findings on the extinct species Teinolophos confirm that suspended ear bones evolved independently among monotremes and therians. (wikipedia.org)
Marsupial3
The morning names a little while back came as a pair ( monotreme, marsupial ) - with related referents (both are taxonomically eccentric mammals) and names that are somewhat similar phonologically. (arnoldzwicky.org)
The monotremes were almost totally swept aside when their pouch-bearing marsupial cousins - modern examples of which include the kangaroos - invaded Australia 71 million to 54 million years ago. (livescience.com)
Morphological and some molecular data support the marsupial-placental clade, but some molecular studies support the monotreme-marsupial clade. (digimorph.org)
Cloaca1
The name monotreme derives from the Greek words μονός (monós 'single') and τρῆμα (trêma 'hole'), referring to the cloaca. (wikipedia.org)
Eggs4
Although they are different from almost all mammals in that they lay eggs, like all mammals, the female monotremes nurse their young with milk. (wikipedia.org)
Logo created to reflect the unique, hand-illustrated effect and nostalgia derived from the meaning behind 'monotreme' -- mammals that are so unique (because they lay eggs) that they have a classification all their own. (andreaktrew.com)
From reptiles with their tough-shelled eggs to monotremes, the only egg-laying mammals, and the vast array of amphibians, fish, and insects, nature's creativity knows no bounds. (thedesigninspiration.com)
Fossil1
The fossil record for monotremes is poor, with few well preserved specimens. (digimorph.org)
Taxonomy2
Monotremes have been considered by some authors to be members of Australosphenida, a clade that contains extinct mammals from the Jurassic and Cretaceous of Madagascar, South America, and Australia, but this categorization is disputed and their taxonomy is under debate. (wikipedia.org)
Monotremes are typified by structural differences in their brains, jaws, digestive tract, reproductive tract, and other body parts, compared to the more common mammalian types. (wikipedia.org)
Monotreme jaws are constructed somewhat differently from those of other mammals, and the jaw opening muscle is different. (wikipedia.org)
Bodies1
Monotremes retain a reptile-like gait, with legs on the sides of, rather than underneath, their bodies. (wikipedia.org)
Mammals found2
Throw a shrimp--or some termites--on the barbie and learn about monotremes, the weird and occasionally duck-billed group of mammals found mainly in Australia. (brainpop.com)
Monotreme Records is a London UK based independent label with an eclectic roster of artists from around the world. (monotremerecords.com)
Monotreme Records hat ja so einige Bands im Portfolio, die den Hörer mit ihren Sounds einlullen können - was mal positiv, mal negativ gemeint ist. (blogspot.com)
Teeth1
Extant monotremes lack teeth as adults. (wikipedia.org)
The monotremes also have extra bones in the shoulder girdle, including an interclavicle and coracoid, which are not found in other mammals. (wikipedia.org)
Unique1
Monotremes provide unique insights into the evolution of sex chromosome silencing in mammals. (bvsalud.org)
Australia1
Long ago, monotremes and their close relatives were the dominant mammals in the whole of Australia. (livescience.com)
Scientists1
Some scientists have suggested that it is a strange monotreme, but the evidence is slender indeed. (newscientist.com)
Earlier this month brand new Adelaide electronic label Monotreme ADL unveiled its first ever release, Lucid Sands, a collaborative EP that features impressive debuts from two new Adelaide based hardware driven electronic projects Featherstone and Centerpoint. (indie30.com)
Page1
Centerpoint v Featherstone's Lucid Sands EP is available exclusively here through Monotreme ADL's Bandcamp page with other digital platforms to follow. (indie30.com)