Which class of fishes, defined by its bony skeleton, did Xiphactinus belong to?
Answer
Actinopterygii
Xiphactinus is identified as a member of the class Actinopterygii, which encompasses the ray-finned fishes. This classification confirms that, despite its fearsome appearance and immense size, it possessed a fundamentally bony skeleton. This characteristic serves as a key distinction when comparing it to other contemporary large marine predators, such as sharks, which possess skeletons composed primarily of cartilage, or ancient marine reptiles. The relatively complete fossil skeletons recovered, especially in locations like Kansas, have provided excellent data on the robust nature of this bony framework necessary to support its massive frame and musculature.
Related Questions
What was the estimated maximum length for the predatory bony fish Xiphactinus?What specialized tail fin structure did Xiphactinus possess, signaling high-speed swimming capability?What classification is given to the large, diamond-shaped, bony scales covering Xiphactinus?How are the large, prominent teeth found in the upper jaw of Xiphactinus described in relation to movement?Which physical characteristic of Xiphactinus demonstrates an adaptation for rapid, open-water pursuit?Which class of fishes, defined by its bony skeleton, did Xiphactinus belong to?Where did the gape of the Xiphactinus's enormous mouth extend relative to its eye socket?What weight estimation, in kilograms, is suggested for the massive Xiphactinus?In which ancient North American marine environment did Xiphactinus function as a dominant apex hunter?What evolutionary trade-off resulted from Xiphactinus possessing both heavy dermal armor and a lunate tail?