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| | Salamanders & Newts (Site not responding. Last check: ) |
 | | In particular, this neoteny can be observed in the families Cryptobranchidae (which looses external gills but retains a respiratory spiracle), Amphiumidae (reduction of limbs, no eyelids, retention of gills), Sirenidae (remains almost totally larval), and Proteidae (retains external gills, loss of eyes). |
 | | Among salamanders, fertilization typically involves the deposit of a sperm plug by the male, which is picked up by the cloaca of the female, allowing internal fertilization. |
 | | The only salamanders known that practice true external fertilization (male "silts" laid eggs with sperm) are in the families Cryptobranchidae, Sirenidae, and Hynobiidae. |
| www.curator.org /legacyvmnh/WebOfLife/Kingdom/P_Chordata/ClassAmphibia/OrderCaudata/salamanders_newts.htm (404 words) |
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