What are three characteristics of jawless fish?

Features of the jawless fish include a notochord, paired gill pouches, a pineal eye, and a two-chambered heart.

What are the two classes of jawless fish?

There are two categories of jawless fish: hagfish and lampreys. Hagfish usually feed on dead or dying fish.

What are the unique characteristics of class Agnatha give at least 3?

Class Agnatha (Jawless fish)

Predicted to be the first vertebrates -> oldest known fossils/most similar to lancets, tunicates.
Have no fins, no scales, and no jaw.
Skeleton of cartilage (firm, flexible tissue not as hard as bone)
No true vertebrae, -> supported by a notochord (the only vertebrates without vertebrae)

What do hagfish typically eat?

Their feeding habits are disgusting but important. Although they have been observed actively hunting fish, hagfish mostly feed on dead and dying creatures on the sea floor. They are known to bury themselves face-first in a carcass, boring a tunnel deep into its flesh to eat their meal from the inside out.

How are lampreys and hagfish different?

Summary – Hagfish vs Lamprey Both lack scales and paired fins. Moreover, they are boneless fish. The key difference between hagfish and lamprey is that hagfish does not have vertebra while lamprey has vertebra. Therefore, hagfish is not considered as a vertebrate while lamprey is a vertebrate.

Why hagfish is not a true fish?

Hagfish are not true fish, as they do not have a backbone. They are opportunist feeders and eat small animals like bristle-worms and crabs, as well as larger live and dead fish. Although they lack a jaw, their mouth is armed with a rasp-like tongue that can lacerate the flesh of their prey.

What are the 3 classes of fishes?

Instead, there are 3 main classes, groups or types of fish: bony fish (Osteichthyes), jawless fish (Agnatha) and cartilaginous fish (Chondrichthyes). Fish are the most diverse group among the vertebrates, with over 33,000 different types of fish species.