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The unisexual females often look like blue-spotted salamanders but have hybrid genomes [9] and require sperm from a co-occurring, related species to fertilize their eggs and initiate development. Usually the eggs [ 10 ] then discard the sperm genome and develop asexually (i.e., gynogenesis , with premeiotic doubling); however, they may ...
Spotted salamanders do produce poisonous skin secretions, which allow them to taste bad to predators. For a human, these skin secretions are more irritating and would not kill an adult or even a ...
The spotted salamander is about 15–25 cm (5.9–9.8 in) long, [7] with females generally being larger than males. [8] They are stout, like most mole salamanders, and have wide snouts. [3] The spotted salamander's main color is black, but can sometimes be a blueish-black, dark gray, dark green, or even dark brown.
Bird eggs are coloured and patterned, seemingly primarily for camouflage to deceive the eyes of egg predators; for example, Eurasian curlews nest among tall grasses and have eggs that are green and spotted like their background, as well as being defended by the adults; in contrast, the eggs of little ringed plovers, laid on pebbly beaches, are ...
The skin of some species contains the powerful poison tetrodotoxin; these salamanders tend to be slow-moving and have bright warning coloration to advertise their toxicity. Salamanders typically lay eggs in water and have aquatic larvae, but great variation occurs in their lifecycles. Some species in harsh environments reproduce while still in ...
Normally fish would eat salamander eggs, but in the vernal pools the eggs are safe. The hatched salamanders can also thrive. [5] [3] Salamanders are explosive spawners and the females lay thousands of eggs which they attach to sticks below the water. In addition to the loss of the hatching larvae to predators, the larger larvae engage in ...
Adult lungless salamanders have four limbs, with four toes on the fore limbs, and usually with five on the hind limbs. Within many species, mating and reproduction occur solely on land. Accordingly, many species also lack an aquatic larval stage, a phenomenon known as direct development in which the offspring hatch as fully-formed, miniature ...
The holotype for Desmognathus fuscus does not exist; Rafinesque (1820) described the type locality to be in the northern parts of the state of New York in small brooks. [6] [7] The spotted dusky salamander (D. conanti) and the flat-headed salamander (D. planiceps) were described in the 1950s but were later thought to be synonymous with the northern dusky salamander, but further studies have ...