The echinoderms are a group (actually, a phylum) of animals.

Examples of acoelomates are found in the kingdom Animalia and the phylum Platyhelminthes.

As such, surgical correction of both chordee and hypospadias is recommended.

The base of the leaf is rounded or sometimes chordate and petioles 0.5–1.2cm..

A recent large-scale re-evaluation of Pikaia places it as a stem-group chordate.

The project aims to understand the evolution of a key developmental process, the posterior elongation among chordates.

Vertebrates are a monophyletic group nested within a larger group known as chordates, which means that understanding vertebrate evolution requires us to examine chordate evolution first.

There is no doubt that chordates evolved from invertebrates.

Several labs of the network use the amphioxus, a cephalochordate representing the earliest divergent lineage of chordates.

Environmental effect on animal development with special focus on chordat neural patterning

Our team is interested in the evolution of morphology during the transition from non-vertebrate chordates to vertebrates.

Non-vertebrate chordates include two groups with present-day representatives – cephalochordates (lancelets) and tunicates (sea squirts).

The theory of evolution assumes that the first Chordata, such as Pikaia, evolved into fish.

Chordates are characterised by the presence of a dorsal neural tube and a notochord.

However, the lack of transitional forms between invertebrates and chordates causes people to put forward many assumptions.76