Do actinopterygii have teeth?
Do actinopterygii have teeth?
In the most derived actinopterygians, there are fewer attachments of these bones and teeth are rarely present. This increased flexibility has allowed to the upper jaw to extend and protrude so as to permit a variety of feeding specializations.
Does actinopterygii have jaws?
It is, and there are about 50 species of seahorses. Although they are bony fish, they do not have scales; instead, they have a thin skin stretched over a series of bony plates arranged in rings throughout their body….Classification of Fishes.
| Class | Actinopterygii |
|---|---|
| Jaws | Yes |
| Scales | Yes |
| Fins | Yes, ray |
What is the difference between actinopterygii and Sarcopterygii?
Actinopterygii, members of which are known as ray-finned fishes, is a class or subclass of the bony fishes. Sarcopterygii (fleshy fin), members of which are known as lobe-finned fish, is a group of the bony fishes.
What are the characteristics of class Sarcopterygii?
annotated classification Subclass Sarcopterygii (lobe-finned fishes) Usually possess a choana; paired fins with a fleshy base over a bony skeleton; persisting notochord; 2 dorsal fins; nares are internal.
What kind of fin does an actinopterygii have?
Subclass Sarcopterygii (lobe-finned fishes) Usually possess a choana; paired fins with a fleshy base over a bony Actinopterygii (ray-finned fishes) Fins supported by rays of dermal bone rather than by cartilage.
What kind of environment did actinopterygians live in?
The class contains… Actinopterygians (ray-finned fishes), however, continued to flourish during the Triassic, gradually moving from freshwater to marine environments, which were already inhabited by subholostean ray-finned fishes (genera intermediate between palaeoniscoids and holosteans).
What are the water pH levels of Actinopterygii?
Across these habitats water temperatures may range from -1.8˚C to nearly 40˚C, pH levels from 4 to 10+, dissolved oxygen levels from zero to saturation, salinities from 0 to 90 parts per million and depths ranging from 0 to 7,000 m (Davenport and Sayer 1993 in Moyle and Cech 2004:1)!
How are actinopterygians classified into the subclasses?
Actinopterygians are divided into the subclasses Chondrostei and Neopterygii. The Neopterygii, in turn, are divided into the infraclasses Holostei and Teleostei. During the Mesozoic and Cenozoic the teleosts in particular diversified widely, and as a result, 96% of all known fish species are teleosts.
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