Question

Describe the unusual anatomical characteristics of the fins of the coelacanth.

A) Coelacanths have robust, lobed pectoral fins with jointed bones, resembling the structure of tetrapod limbs.
B) Their dorsal fins are supported by thick, fleshy lobes, providing stability during swimming.
C) Coelacanths possess unique fin rays with specialized cartilaginous elements, allowing flexible movements.
D) The caudal fin of coelacanths is diphycercal, meaning the upper and lower lobes are of equal size, enhancing maneuverability.

Answer 1

Coelacanths exhibit unique anatomical features, including lobed pectoral fins with bones similar to early tetrapod limbs, diphycercal caudal fins for better maneuverability, and thick dorsal fin lobes for stability.

Step-by-step explanation:

The coelacanth, a member of the order Sarcopterygii, is known for its lobed pectoral fins with a bone structure that resembles the limbs of early tetrapods. This anatomical feature is significant as it provides insight into the evolutionary transition from aquatic to terrestrial animals. The coelacanth's diphycercal caudal fin, with equally sized upper and lower lobes, is another distinctive characteristic that aids in its maneuverability in water. Moreover, their dorsal fins are supported by thick, fleshy lobes that help stabilize the fish during swimming.

These unusual anatomical traits demonstrate the coelacanth's position as a transitional form in vertebrate evolution.Coelacanths exhibit unique anatomical features, including lobed pectoral fins with bones similar to early tetrapod limbs, diphycercal caudal fins for better maneuverability, and thick dorsal fin lobes for stability.