What is the link between reptiles and mammals?

What is the link between reptiles and mammals?

Duck-billed platypus
Archaeopteryx. Hint: Duck-billed platypus is the connecting link between reptiles and mammals, as it has both reptiles and mammals’ features.

Are monotremes more closely related to reptiles or mammals?

Monotremes are a derivative of an ancient mammal stock but there is no direct evidence of what it might have been. Monotremes are not closely related to marsupials or placental mammals, but rather they evolved from a distinct group of reptilian ancestors.

Why are monotremes considered mammals?

Why then are they considered mammals you may be wondering? Like other mammals, monotremes are warm-blooded. They have hair on their bodies and produce milk to feed their young. Although they have mammary glands, monotremes do not have nipples like other mammals.

What do monotremes and mammals have in common?

General characteristics. Like other mammals, monotremes are endothermic with a high metabolic rate (though not as high as other mammals; see below); have hair on their bodies; produce milk through mammary glands to feed their young; have a single bone in their lower jaw; and have three middle-ear bones.

Which represents connecting link between amphibians and reptiles?

Complete answer: The connecting link between amphibians and reptiles is Seymouria which was an animal living in the Permian period on both the land and in water. It is said to be a connecting link because its larval stages show amphibian-like features whereas its adult stages show reptile-like features.

Is the connecting link between Annelida and Arthropoda?

Peripatus is a connecting link between Annelida and Arthropoda.

Why are monotremes different from reptiles?

However, unlike reptiles, female monotremes retain their eggs for some time (typically for two or three weeks) and actively provide the eggs with nutrients. Female platypuses lay their eggs in burrows. Like other mammals, female monotremes have mammary glands that produce milk.

How are monotremes similar to reptiles?

The word “monotreme” literally means “one opening,” which is a characteristic feature: similar to birds and reptiles, they have the same opening for fecal matter, urine, and reproduction, called a cloaca. Also like birds and reptiles, monotremes lay eggs, although their eggs are uniquely rubbery and rather small.

Are monotremes reptiles?

Monotremes, considered the most primitive form of mammals, have birdlike and reptilian features. The females lay eggs. Monotremes are represented by the aquatic duckbilled platypus and insectivorous echidna (spiny anteater).

What are similarities mammals share with reptiles and birds?

Although birds are more closely related to reptiles than mammals, birds and mammals have several characteristics in common.

• Warm-Blooded.
• Vertebrates.
• Heart.
• Blood.
• Caring for Young.

What is shared between reptiles and monotremes?

What is the connecting link between birds and mammals?

Birds and modern day reptiles came from Sauropsids, while mammals came from Synapsids. Mammals too evolved from reptiles so Platypus and Echidna are the connecting link here…

What is the difference between a monotreme and a mammal?

The key anatomical difference between monotremes and other mammals gives them their name; monotreme means “single opening” in Greek, referring to the single duct (the cloaca) for their urinary, defecatory, and reproductive systems. Like reptiles, monotremes have a single cloaca.

How do monotremes communicate with each other?

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.

What is the body temperature of monotremes?

Monotremes’ metabolic rate is remarkably low by mammalian standards. The platypus has an average body temperature of about 31 °C (88 °F) rather than the averages of 35 °C (95 °F) for marsupials and 37 °C (99 °F) for placental mammals.

What is the zygotic development of monotreme?

Monotremes are also noteworthy in their zygotic development: Most mammalian zygotes go through holoblastic cleavage, where the ovum splits into multiple, divisible daughter cells. Contrastingly, monotreme zygotes, like those of birds and reptiles, undergo meroblastic (partial) division.