Table of Contents
What animals belong to the class Actinopterygii?
Actinopterygiiray-finned fishes
- OrderAcipenseriformessturgeons and paddlefishes.
- OrderAlbuliformesbonefishes.
- OrderAmiiformesbowfins.
- OrderAnguilliformeseels.
- OrderAteleopodiformesjellynose or tadpole fishes.
- OrderAtheriniformessilversides.
- OrderAulopiformesgrinners, lizardfishes and allies.
- OrderBatrachoidiformes.
What percentage of fish are in the class Actinopterygii?
50%
Actinopterygii (/ˌæktɪnɒptəˈrɪdʒiaɪ/; from actino- ‘having rays’, and Ancient Greek πτέρυξ (ptérux) ‘wing, fins’), members of which are known as ray-finned fishes, is a clade (traditionally class or subclass) of the bony fishes. They comprise over 50% of living vertebrate species.
How many species are in the Actinopterygii class?
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.
What is the proper differentiation between class Actinopterygii & class Sarcopterygii?
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.
What makes a Actinopterygii?
Actinopterygii (ray-finned fishes) Fins supported by rays of dermal bone rather than by cartilage.
What are the characteristics of the class 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.
How many Actinopterygii orders are there?
42 orders
evolutionary stages The Actinopterygii, or ray-finned fishes, are the largest class of fishes. In existence for about 400 million years, since the Early Devonian, it consists of some 42 orders containing more than 480 families, at least 80 of which are known only from fossils.
What is an example of Actinopterygii?
AnglerfishParrotfishKoiPuffersCatfishMahi‑mahi
Ray-finned fishes/Lower classifications
What do Actinopterygii have in common?
The anatomy of ray-finned fish shows many of the characteristics common to all chordates: pharyngeal slits, a nerve cord, and body wall muscles arranged in myotomes, or segmented blocks.
What did Acanthodians evolve?
Overall, the acanthodians’ jaws are presumed to have evolved from the first gill arch of some ancestral jawless fishes that had a gill skeleton made of pieces of jointed cartilage.
What did actinopterygians evolve?
They arose from an order of holosteans now extinct, the Pholidophoriformes. This group was intermediate in character between the chondrosteans and the teleosts.
Did acanthodians have jaws?
How did gnathostomes evolve?
The evolution of the jaw combined with paired fins permitted gnathostomes to expand from the sedentary suspension feeding of jawless fishes and become mobile predators. The gnathostomes’ ability to exploit new nutrient sources led to their evolutionary success during the Devonian period.
What did Acanthodii evolve from?
Are acanthodians extinct?
The acanthodians are a mysterious extinct group of fishes, which lived in the waters of the Palaeozoic era (541 million to 252 million years ago). They are characterized by a superficially shark-like coating of tiny scales, and spines in front of their fins (Fig.
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 |