Hagfish

National Frog Day.

It is also Hagfish Day.

All right,

not

I mean, I don't know if you've ever seen a Chilean sea bass.

Those are pretty...

Hagfish is one of the grosser things around.

Yeah, okay, yeah.

This clade can be divided into infraphylla, agnatha, and nathostomata.

Let's examine the first of these now, the jawless agnathans, or cyclostomi, and in particular, the hagfish.

Hagfish are in the class Myxinae, and are also known as slime eels, though they aren't actually eels at all.

Modern hagfish are famous for their close resemblance to their ancestors from around 300 million years ago, along with their general morphology, ability to survive in low oxygen environments, unique method of feeding, and slime production.

In order to examine them, let's discuss their body systems and unique characteristics, feeding, reproduction, and finally their phylogeny and classification.

Hagfish have elongated bodies that are divided into three regions, the head, trunk, and tail.

They lack true fins but have a well-developed muscular system arranged in a series of myomeres, which are segmented muscle blocks that run along the length of the body.

These myomeres contract in a coordinated manner to produce undulating waves of motion that propel the hagfish forward.