Search results
Results from the WOW.Com Content Network
Male Dendropsophus microcephalus calling. Sexual selection in amphibians involves sexual selection processes in amphibians, including frogs, salamanders and newts.Prolonged breeders, the majority of frog species, have breeding seasons at regular intervals where male-male competition occurs with males arriving at the waters edge first in large number and producing a wide range of vocalizations ...
In unisexual salamanders these different levels of polyploidy are a result of multiple hybridization events, involving two to four species. [ 4 ] [ 8 ] Ambystoma nothagenes is a unisexual, triploid hybrid of Ambystoma laterale , Ambystoma texanum and Ambystoma tigrinum , while hybrids of Ambystoma platineum and Ambystoma texanum have been found ...
The embryo during this process is called a gastrula. The germ layers are referred to as the ectoderm, mesoderm and endoderm. In diploblastic animals only the ectoderm and the endoderm are present. [8] * Among different animals, different combinations of the following processes occur to place the cells in the interior of the embryo:
As the blastopore deepens, a new embryonic cavity develops, the primitive gut, or the archenteron. It grows in length towards the future front part of the embryo. It can be seen from outside the embryo that the dorsal lip curves itself and grows, creating the side lips of the blastopore. During this time, the paraxial mesoderm enters the embryo.
The marsh frog (Pelophylax ridibundus) is a species of true frog and the largest frog native to Europe; females of this sexually dimorphic species may be up to 17 centimetres (6.7 in) long. The marsh frog feeds mainly on insects, but it also eats smaller amphibians, fish, and rodents.
Salamanders, spiders, some insects and some molluscs undertake internal fertilization by transferring a spermatophore, a bundle of sperm, from the male to the female. Following fertilization, the embryos are laid as eggs in oviparous organisms, or continue to develop inside the reproductive tract of the mother to be born later as live young in ...
While only the skull - measuring around 1.2 inches (3 cm) long - was discovered, the researchers think Kermitops had a stoutly built salamander-like body roughly 6-7 inches (15-18 cm) long, though ...
The reason it is referred to as a big night is because there is a large number of salamanders moving at the same time. Warmer air and loose soil coupled with rain cause salamanders to leave their underground burrows. The event takes place at night to minimize predation. The rain on the big night keeps the salamanders skin from becoming dry. [1]