viviparity

Reproduction is aplacental viviparity in the same way as great white sharks.

Hemotrophic viviparity is where nutrients are provided directly by the female.

The offspring consume their mother from the inside in a process known as hemocelous viviparity.

The first two of these modes were categorized under aplacental viviparity.

Because the space for developing embryos is limited, viviparity reduces brood size.

Hemotrophic viviparity: nutrients are provided by the female, often through some form of placenta.

Example: where, when, and why did placentas and viviparity evolve?

This makes Materpiscis the oldest known vertebrate to show viviparity, or giving birth to live young.

Ovoviviparity is a special type of viviparity.

Among mammals by contrast, viviparity and lactation mean that the limiting resource is nearly always the female's rearing capacity.

The lizard Pseudomoia pagenstecheri and most mammals exhibit hemotrophic viviparity.

It has been suggested that the selection and fixation of these proteins for this function have played a critical role in the evolution of viviparity.

Reproduction is a special kind of viviparity, called placental viviparity.

Homeothermy, viviparity, heterodonty The embryo is a platypus.

Adenotrophic viviparity means "gland fed, live birth".

Although they were reptiles and descended from egg-laying ancestors, viviparity is not as unexpected as it first appears.

A gravid lizard from the Cretaceous of China and the early history of squamate viviparity.

The exact mode of reproduction ranges from ovoviviparity through to viviparity (see section on reproduction in the halfbeak article).

This species has a zygoparous form of oviparity, which occupies an intermediate position between oviparity and viviparity.

The daisy stingray feeds mainly on crustaceans and exhibits aplacental viviparity, with litters of 1-4 young.

The true opposite of oviparity is placental viviparity, employed by almost all mammals (the exceptions being marsupials and monotremes).

Lactation is also the hallmark of adenotrophic viviparity - a breeding mechanism developed by some insects, most notably tsetse flies.

This is known as "yolk-sac viviparity" and is regarded as a type of lecithotrophy (no maternal provisioning).

Viviparity and ovoviviparity have evolved in many extinct clades of reptiles and in squamates.

Single oviparity is considered to be the basal condition, while multiple oviparity and aplacental viviparity are thought to be more derived.