Today, the protostomes include priapulids and most other invertebrates. The deuterostomes include vertebrates such as humans and a few spineless animal lineages.

Hence the common ancestor is not between a Protostome and Deuterostome, but between a Chaetognath and a deuterostome. May I remind you that Chaetognaths share the same embryological characteristics as ...

The division between protostomes and deuterostomes, first established in 1908, is an evolutionarily significant one and has informed our understanding of how various types of animals developed.

Xiao said protostomes and deuterostomes likely separated from each other no later than 550 million years ago. “Primary-mouthers have a fossil record that goes back to 550 million years ago, ...

Today, the protostomes include priapulids and most other invertebrates. The deuterostomes include vertebrates such as humans and a few spineless animal lineages.

The deuterostomes also include some less familiar animals such as sea urchins and starfish. The protostomes include several invertebrate groups such as insects, spiders, lobsters and flatworms.

In the protostomes, the mouth that develops at the beginning of embryonic development becomes the organism's actual mouth, whereas, in the deuterostomes, it becomes the anus and the mouth develops ...

Figure 1: Protostomes and deuterostomes. Evolutionary biologists are especially interested in whether any of the surviving 'basal' deuterostomes (echinoderms, hemichordates and tunicates) ...

This course will examine the major animal phyla that make up the animal kingdom. It will discuss their structure and how this is related to function and way of life. The major invertebrate groups will ...

An international team of researchers from China, USA, UK and Switzerland have discovered that humans are not related to a 535 million-year-old microscopic creature with no anus.

Most early embryos form a dent in the ball of cells that will become either the anus or the mouth, and are called deuterostomes or protostomes accordingly. Human are, incidentally, deuterostomes ...