Other species of fish are oviparous and have internal fertilization aided by pelvic or anal fins that are modified into an intromittent organ analogous to the human penis.
32.
This would indicate the large and bulky Diadectomorphs laid spawning with aquatic tadpoles, internal fertilization with or without ovoviviparity, aquatic eggs with direct development or some combination of these.
33.
Other animals then used existing body parts, like an arm in the case of an octopus and a tail in the case of a turtle, to do internal fertilization.
34.
Many animals that live in water use external fertilization, whereas internal fertilization may have developed from a need to maintain gametes in a liquid medium in the Late Ordovician epoch.
35.
They make up an important component of nearshore fisheries in northern Asia . " S . schlegelii " breed via internal fertilization, females storing sperm until the development of the eggs.
36.
All cartilaginous fishes the elasmobranches ( e . g ., sharks, rays, and skates ) employ internal fertilization and usually lay large, heavy-shelled eggs or give birth to live young.
37.
In most anurans, the males deposit sperm onto the eggs as they are being laid, however males of the genus " Ascaphus " possess an intromittent organ, unique among anurans, for internal fertilization.
38.
Arthropods'methods of reproduction and development are diverse; all terrestrial species use internal fertilization, but this is often by indirect transfer of the sperm via an appendage or the ground, rather than by direct injection.
39.
Extraordinary evidence of internal fertilization in a placoderm was afforded by the discovery in the Gogo Formation, near Fitzroy Crossing, viviparous " ), The males reproduced by inserting a long clasper into the female.
40.
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.
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