The echidna and the duck-billed platypus
, which are the only egg-laying mammals, are so distinct that they are assigned to a discrete subclass, the Prototheria, which includes the order Monotremata, separate from the more familiar and well-studied placental mammals.
Which of the following is a monotreme quizlet?
Monotremes or egg-laying mammals include
the platypus and four species of echidna
.
Which of the following is a monotreme?
There are only five living monotreme species: the
duck-billed platypus
and four species of echidna (also known as spiny anteaters). All of them are found only in Australia and New Guinea. Monotremes are not a very diverse group today, and there has not been much fossil information known until rather recently.
What is a monotreme quizlet?
monotreme. “
one hole” cloaca for excretory and reproductive systems
. monotremes differ from marsupial and placental mammals b/c. -different mode of reproduction (lay eggs)
Is a kangaroo a monotreme?
Marsupials (e.g. kangaroo, opossum) and
monotremes
(e.g. platypus) differ from placental mammals in many characteristics, particularly reproduction. … Marsupials have a few very large and very conserved chromosomes, while monotremes show a reptile-like size dichotomy and have a unique chain of ten sex chromosomes.
Is platypus a monotreme?
The
monotremes
are a group of highly specialised egg-laying predatory mammals, containing the platypus and echidnas. There are only five living species of monotreme, contained within two families: Family Ornithorhynchidae: the platypus, a single species in a single genus, Ornithorhynchus anatinus.
What are monotremes give two examples?
The only surviving examples of monotremes are all indigenous to Australia and New Guinea although there is evidence that they were once more widespread including some extinct species in South America. The extant monotreme species are
the platypus
and four species of echidnas.
Which organism is a monotreme group of answer choices?
There are only five living monotreme species:
the duck-billed platypus
and four species of echidna (also known as spiny anteaters). All of them are found only in Australia and New Guinea. Monotremes are not a very diverse group today, and there has not been much fossil information known until rather recently.
Which organism is a marsupial group of answer choices?
The word marsupial comes from marsupium, the Latin word for purse. Marsupials include
kangaroos, koalas, opossums
, and many other similar animals. Most of them are native only to Australia and New Guinea.
What is special about monotreme?
Monotremes are different from other mammals
because they lay eggs and have no teats
. Monotremes are different from other mammals because they lay eggs and have no teats. The milk is provided for their young by being secreted by many pores on the female’s belly.
Do mammals have placentas?
The
eutherian
or ‘placental’ mammals, like humans, make up the vast majority of today’s mammalian diversity. Eutherians all have a chorioallantoic placenta, a remarkable organ that forms after conception at the site where the embryo makes contact with the lining of the mother’s uterus (Langer, 2008).
How are monotremes different from other mammals quizlet?
How are monotremes different from all other animals? How are they similar? They
are different because they don’t have nipples
. They are similar because they have mammary glands.
The platypus and its closest relative,
the echidna
, belong to an order of mammals called the monotremes (Monotremata). They are the only representatives of this group left, surviving among the marsupials of Australia, Tasmania and New Guinea.
What are the 5 types of monotremes?
- Western Long-beaked Echidna. The western long-beaked echidna (Zaglossus bruijni) is found on the island of New Guinea. …
- Eastern Long-beaked Echidna. …
- Sir David’s Long-beaked Echidna. …
- Short-beaked Echidna. …
- Duck-billed Platypus.
Are humans Eutherians?
The eutherian or ‘placental’ mammals, like humans, make up the vast majority of today’s mammalian diversity.
What are the 3 types of mammals?
Mammals can be divided into three more groups based on how their babies develop. These three groups are
monotremes, marsupials, and the largest group, placental mammals
. Monotremes are mammals that lay eggs.
