What makes a actinopterygii?
Actinopterygii (ray-finned fishes) Fins supported by rays of dermal bone rather than by cartilage. A group of jawed fishes so diverse that no single definition for them can be derived; better understood by determining the distinctive characters of the primitive members and then tracing their…
What is the difference between actinopterygii and Sarcopterygii?
Sarcopterygii and actinopterygii are two groups of osteichthyans. The key difference between sarcopterygii and actinopterygii relies mainly on their fin structure. Sarcopterygii fish species have lobed fins, while the actinopterygii fish species have ray fins.
Is actinopterygii Oviparous?
Most families use external rather than internal fertilization. Of the oviparous teleosts, most (79%) do not provide parental care. The mangrove rivulus is an amphibious, simultaneous hermaphrodite, producing both eggs and spawn and having internal fertilisation.
What are the characteristics of actinopterygii?
General Characters:
- Thin and elongated fishes.
- Body is covered by small cycloid scales. Head region is devoid of any scales. Some fishes are scaleless.
- Long dorsal and caudal fins are spineless. Fins may not be supported by fin rays.
- Mouth aperture is comparatively large.
- No accessory respiratory organs are present.
What characteristics do actinopterygii have?
What are class actinopterygii organisms?
Classification
- Polypteriformes (Bichirs, Reedfishes)
- Acipenseriformes (Sturgeons, Paddlefish)
- Lepisosteiformes (Gars)
- Amiiformes (Bowfin)
- Osteoglossiformes (bony-tongued fishes)
- Hiodontiformes (mooneye, goldeneye …)
- Elopiformes (ladyfishes, tarpon … )
- Albuliformes (bonefishes)
How many species of actinopterygii are there?
27,000 species
Diversity and Lower Taxonomy: The subclass Actinopterygii comprises some 27,000 species of ray-finned bony fishes, making it the largest radiation of any vertebrate group.
Do actinopterygii have bones?
1.1 Ray-finned fish—(Actinopterygii) Ray-finned fish have a true bony skeleton, and they have an upper jaw that consists of two bones that allow the upper jaw to easily extend.
What are the key traits in actinopterygii?
What’s the difference between a sarcopterygii and an Actinoptergii?
The key difference between Sarcopterygii and Actinopterygii is that sarcopterygii is a class of bony fish, consisting of lobed fish that have fleshy, lobed and paired fins. Meanwhile, actinopterygii is a class of bony fish, consisting of ray-finned fish that have fins supported by horny spines.
What kind of fish is Actinopterygii from Wikipedia?
Actinopterygii. From Wikipedia, the free encyclopedia. Jump to navigation Jump to search. Class of ray-finned bony fishes. Ray-finned fish. Temporal range: Late Silurian – recent. PreꞒ. Ꞓ. O.
How are actinopterygians related to terrestrial vertebrates?
During the Mesozoic and Cenozoic the teleosts in particular diversified widely, and as a result, 96% of all known fish species are teleosts. The cladogram shows the major groups of actinopterygians and their relationship to the terrestrial vertebrates (tetrapods) that evolved from a related group of fish.
Where do the actinopterygian fin rays attach to?
These actinopterygian fin rays attach directly to the proximal or basal skeletal elements, the radials, which represent the link or connection between these fins and the internal skeleton (e.g., pelvic and pectoral girdles). By species count, actinopterygians dominate the vertebrates, and they comprise nearly 99% of the over 30,000 species of fish.