What defining skeletal characteristic separates the Class Actinopterygii from lobe-finned fishes?
Answer
Fins supported by bony rays
The Class Actinopterygii translates literally to "ray-finned fishes." This massive classification of modern fish species is fundamentally defined by the internal structure of their fins, which are supported by bony rays. This contrasts sharply with lobe-finned fishes, such as lungfish, whose fins are supported by fleshy lobes. This morphological trait places the walleye within the vast majority of extant fish species and is fundamental to its streamlined, free-swimming aquatic morphology adapted for its native freshwater ranges.
Related Questions
What does the specific epithet vitreus in Sander vitreus reference?Which family classification places S. vitreus directly with the sauger (S. canadensis)?What defining skeletal characteristic separates the Class Actinopterygii from lobe-finned fishes?What is the global conservation status assessment (G5) assigned to Sander vitreus by NatureServe?Which species hybridizes with S. vitreus to produce the fertile cross known as "saugeye"?What physical feature is a primary characteristic of the genus Sander besides the elongated body?Before the acceptance of the genus Sander, what scientific name was often used for the walleye?What temperature range defines the preferred habitat classification for walleye as coolwater fish?Membership in the Phylum Chordata signifies that S. vitreus possesses which developmental structures?How are the two separate dorsal fins of Sander vitreus characterized morphologically?