The spadenose shark has the most advanced form of placental viviparity known in fish, as measured by the complexity of the placental connection and the difference in weight between the egg and the newborn young.
32.
The tsetse fly ( as well as other Glossinidae, Hippoboscidae, Nycteribidae and Streblidae ) exhibits adenotrophic viviparity; a single fertilised egg is retained in the oviduct and the developing larva feeds on glandular secretions.
33.
Thierry Lod?described reproductive strategies in terms of the development of the zygote and the interrelationship with the parents; there are five classifications-ovuliparity, oviparity, ovo-viviparity, histotrophic viviparity and hemotrophic viviparity.
34.
Thierry Lod?described reproductive strategies in terms of the development of the zygote and the interrelationship with the parents; there are five classifications-ovuliparity, oviparity, ovo-viviparity, histotrophic viviparity and hemotrophic viviparity.
35.
Thierry Lod?described reproductive strategies in terms of the development of the zygote and the interrelationship with the parents; there are five classifications-ovuliparity, oviparity, ovo-viviparity, histotrophic viviparity and hemotrophic viviparity.
36.
The " Incisoscutum " fossils show the oldest record of viviparity in any vertebrate, therefore internal fertilization and viviparity must have evolved in the vertebrates at least 380 million years ago and outside the gnathostomes.
37.
The " Incisoscutum " fossils show the oldest record of viviparity in any vertebrate, therefore internal fertilization and viviparity must have evolved in the vertebrates at least 380 million years ago and outside the gnathostomes.
38.
Like the false catshark, the slender smooth-hound exhibits aplacental viviparity with oophagy, in a form different from that in the fertilized and develops into an embryo, while the remaining ova begin to break down.
39.
In zoology " viviparity " refers to development of the embryo inside the body of the parent, eventually leading to live birth, as opposed to reproduction by laying eggs that complete their incubation outside the parental body.
40.
The idea that the tendency to favour egg-retention selectively under cooler conditions arises from the thermoregulatory benefits, and that it consequently promotes the evolution of viviparity as an adaptation, is known as " the cold climate hypothesis ".
