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The jellynose fishes or tadpole fishes are the small order Ateleopodiformes. This group of ray-finned fish is monotypic , containing a single family Ateleopodidae . It has about a dozen species in four genera , but these enigmatic fishes are in need of taxonomic revision.
A tadpole or polliwog (also spelled pollywog) is the larval stage in the biological life cycle of an amphibian. Most tadpoles are fully aquatic, though some species of amphibians have tadpoles that are terrestrial. Tadpoles have some fish-like features that may not be found in adult amphibians such as a lateral line, gills and swimming tails.
Triops longicaudatus (commonly called American tadpole shrimp or longtail tadpole shrimp) is a freshwater crustacean of the order Notostraca, resembling a miniature horseshoe crab. It is characterized by an elongated, segmented body, a flattened shield-like brownish carapace covering two thirds of the thorax, and two long filaments on the abdomen.
Smaller fish feed more on small crustaceans while large fish tend to consume large prey such as worms and grass shrimp. Researchers in Wisconsin recorded the stomach contents of numerous tadpole madtoms and found an average diet consisting of 44% insects, 28.3% small crustaceans, 18.3% oligochaetes , 5.9% plants, 3% silt and debris, 0.1% snails ...
The feet of Xenopus species have three black claws on the last three digits. These claws are used to rip apart food and scratch predators. Clawed frogs are carnivores and will eat both living and dead prey including fish, tadpoles, crustaceans, annelids, arthropods, and more.
Tadpoles transform in about 23–67 days, and unlike other anurans, they filter-feed on plankton. [25] The tadpoles' heads are pointed with lateral eyes, and they appear dorsolaterally flattened when viewed from above. Their bodies are dark in color (almost jet black), and are flecked with blue.
The tadpole-gobies [1] (Benthophilus), also called pugolovkas (which means "tadpole" in Russian), are a genus of Ponto-Caspian fish in the family Gobiidae. They are distributed in the fresh and brackish waters of basins of the Black Sea , Caspian Sea and the Sea of Azov , up to salinities of about 20 ‰.
The white skin color of the olm retains the ability to produce melanin, and will gradually turn dark when exposed to light; in some cases the larvae are also colored. One population, the black olm, is always pigmented and dark brownish to blackish when adult. [17] The olm's pear-shaped head ends with a short, dorsoventrally flattened snout.