What is Agnatha give an example?

Pteraspidomorphi
Haikouichthys
Jawless fish/Lower classifications
Apart from having no jaws, extant agnathans are characterized by lacking paired appendages. Most of them do have a caudal fin. Fish species included in this group include the cyclostomes (e.g. lampreys and hagfish) and the extinct ostracoderms (e.g. Pteraspidomorphi, Thelodonti, Anaspida, and Cephalaspidomorphi).

What senses does Myxini rely on?

Hagfish, also called slime eels, use a wide range of techniques via which it communicates or finds its prey. These animals are highly developed in their senses and rely on the sense of touch and smell to find their food. They also have numerous pairs of sense organs or barbels around their mouth which act as tentacles.

Which are characteristics of hagfish?

Hagfish are long, slender and pinkish, and are best known for the large quantities of sticky slime which they produce. Hagfish have three accessory hearts, no cerebrum or cerebellum, no jaws or stomach, and will “sneeze” when their nostrils clog with their own slime.

How do hagfish reproduce?

Very little is known about the reproductive habits of the hagfish. It has been observed that some hagfish species are actually hermaphroditic, which means that they are both male and female. Females will lay up to 30 tough, yolky eggs. These eggs tend to stick together due to velcro-like attachments on the ends.

What is Agnathostomata?

1 : a superclass or other division of Vertebrata comprising those without jaws — compare gnathostomata. 2 : a group of carnivorous air-breathing snails without jaws.

What animals have no jaws?

Cyclostomes: Hagfish and Lampreys In fact, they are the only two groups of extant vertebrates that lack jaws.

Can fish hear underwater?

Hearing. Hearing is an important sensory system for most species of fish. As such, aquatic animals such as fish have a more specialized hearing apparatus that is effective underwater. Fish can sense sound through their lateral lines and their otoliths (ears).

What do all Chondrichthyes have in common?

Members of Chondrichthyes all lack true bone and have a skeleton made of cartilage (the flexible material you can feel in your nose and ears). Only their teeth, and sometimes their vertebrae, are calcified; this calcified cartilage has a different structure from that of true bone.

How many hearts do hagfish have?

five hearts
The hagfish, Myxine glutnosa, has five hearts. The Hagfish. There is a three-chambered systemic heart, two accessory, one portal, and one caudal heart.