Phylum Xenacoelomorpha and an Introduction to Nephrozoa
Most of the animals we are familiar with are contained in Nephrozoa, as these are the triploblastic and bilaterally symmetrical animals. The phyla we've covered so far are not part of Nephrozoa, and we have one more to cover before we get there, Xenocoelomorpha. This contains worm-like tri
From playlist Zoology
Eusthenopteron - Fish With Bones | History of Life | Water Creatures | Documentary Series
🐟 Eusthenopteron is a genus of fossil muslin fish (Sarcopterygii). They lived in the Devonian period (about 385 million years ago) in lakes and rivers. They are one of the intermediary links in the evolution of vertebrates from fish to amphibians. They were related to the genus Hyneria. Th
From playlist Facts About First Sea Creatures
Phylum Cnidaria Part 2: Class Hydrozoa
As we now know, there are five major classes within phylum Cnidaria, and we will go through them one at a time. First up is class Hydrozoa. This contains a variety of small predatory polyps, such as hydras. These are fascinating creatures which can undergo morphallaxis, or tissue regenerat
From playlist Zoology
Phylum Cnidaria Part 1: Introduction and Broad Characteristics
Next up for animal phyla is Cnidaria! This phylum contains jellyfish, sea anemones, corals, and all kinds of other organisms. This one is pretty meaty so it will take several tutorials. Let's start by getting through some information that pertains broadly to the entire phylum! Script by R
From playlist Zoology
Phylum Rotifera Part 1: General Characteristics
It's time to wrap up our study of Gnathifera, and this means investigating phylum Rotifera. These are the wheel animals, and we will need a few tutorials to get through them all. Some species are free-living and some are parasitic, and you've probably had some in your body, since they're p
From playlist Zoology
Phylum Micrognathozoa: Tiniest Invertebrates on Earth
The members of phylum Micrognathozoa are very tiny, around a tenth of a millimeter. And in fact, this is the only monotypic animal phylum, meaning the only one containing only one species, L. maerski. This species was discovered in 1994, and no male organisms in this species have ever been
From playlist Zoology
Phyla Orthonectida and Dicyemida: Mesozoans
Now we move on to the invertebrate parasites in the phyla Orthonectida and Dicyemida. These are highly degenerate metazoans, so they have lost some characteristics shared by all animals, but genomic analyses confirm that they are within Animalia. What are these creatures all about? Let's f
From playlist Zoology
Phylum Chaetognatha: Arrow Worms
The organisms in phylum Chaetognatha are known as arrow-worms, or bristle-jaws. They have a very interesting anatomy and eating habits. Their phylogeny is tricky and still in flux, so let's learn about what we know right now! Script by Ryan Helcoski and Dr. Carsten H G Müller: https://www
From playlist Zoology
Phylum Cnidaria Part 3: Classes Scyphozoa and Staurozoa
We are covering the classes within phylum Cnidaria, and with Hydrozoa finished, we can move on to Scyphozoa and Staurozoa. The Scyphozoans are the "true jellyfish", possibly the most widely recognized Cnidarians, while the Staurozoans are the "stalked jellyfish". Let's learn about them all
From playlist Zoology
Phylum Gastrotricha: Hairybellies
Gastrotrichs are odd little creatures that have cilia on their bellies. They are found all over the world, making up an important part of the meiofauna of various ecosystems. What's their anatomy? How do they reproduce? Let's learn all about these little critters! Script by Ryan Helcoski
From playlist Zoology