An animal that had gill arches with many gill filaments was caught. Each gill filament had many vertically stacked lamellae. The gills were found to be heavily vascularised. Before being caught, the animal was tracked for several hours and observed to swim continuously. No evidence was found of a double-action pump or specialised appendages for ventilation. The animal is most likely to be a
A) subtidal crab.
B) terrestrial crab.
C) tuna.
D) stingray.
E) shark.

Question

Quizplus · Accepted Answer

The description of the gills with many filaments and lamellae, along with the need for continuous swimming, suggests a fish that relies on ram ventilation, like a tuna. Tuna are known for their high-speed swimming and require continuous movement to pass water over their gills for oxygen exchange.

An Animal That Had Gill Arches with Many Gill Filaments