Question

Myxine is also known as
A. Lamprey
B. Hagfish
C. Silver fish
D. Devil fish

Answer 1

Myxine are the only known living animals that have no vertebral column but have a skull and it respires generally through its pharynx. The myxine are found to lack eyes and jaws and are observed to be star-like in appearance. Gill slit is present on both sides of the body.

Complete answer:
Option A is incorrect:
Lampreys are sometimes referred to as lamprey eels. They belong to the class Agnatha. They are an ancient and still surviving lineage of jawless fish. The adult lampreys are primitive fishlike jawless vertebrates which is characterized by a toothed, funnel-like sucking mouth. They survive in coastal and fresh waters and are highly found in the regions of temperate zones around the world. Like the hagfish, this kind of eel-like, scaleless fish have well developed eyes and lacks jaws, bones and paired fins.
Option B is correct:
Hagfish, belongs to the class Myxine. It is also called as Hyperotreti. Hagfish have an eel-like shaped and an elongated body with paddle-like tails. Its tooth-like features are composed mostly of keratin. Depending upon the species, the colour of hagfish varies ranging from pink to blue-grey and white or black spots on them. This marine fish is sometimes referred to as slime eels because of its ability to release large amounts of fibrous and milky like mucus called slime.
Option C is incorrect:
A silverfish has a fish-like appearance in its movements but it is a small, primitive, wingless nocturnal insect. The common name 'silverfish' is derived from the fact that they are silvery light grey in colour. It usually consumes carbohydrates such as starches and sugar
Option D is incorrect:
The other name to refer to devil fish is known as giant devil ray. It belongs to the family Mobulidae and it is one of the species of ray. At present, this devil fish is listed as endangered and it is mostly found in the deep coastal waters and sometimes in shallow waters

Hence, the correct answer is option (B).

Note: Hagfish are jawless fish, along with lampreys. The real-living hagfish looks alike and similar in appearance to the hagfish that survived from around 300 million years ago. The presence of food is detected by the well developed senses of the Hagfish.