cnidaria

A short survey to a depth of 20 m revealed 168 species of finfish, 60 species of cnidaria, including corals, 8 molluscs, 14 sponges, 11 echinoderms, 15 arthropods and 8 annelid worms.

Pitons Management Area, Saint Lucia 2008

Did the cnidaria have Hox clusters, suggesting that the clustered Hox genes were a very early event in evolution, or do they lack them and therefore evolved an independent set of mechanisms for specifying positional information along the body axis?

The Panda's Thumb: May 2006 Archives 2006

Did the cnidaria have Hox clusters, suggesting that the clustered Hox genes were a very early event in evolution, or do they lack them and therefore evolved an independent set of mechanisms for specifying positional information along the body axis?

Jellyfish lack true Hox genes! - The Panda's Thumb 2006

This simplest of all the cnidaria has, it is true, a crown of tentacles round its mouth.

The Evolution of Man — Volume 1 Ernst Heinrich Philipp August Haeckel 1876

(Sagitta), and many of the echinoderms and cnidaria, such as the common star-fish and sea-urchin, many of the medusae and corals, and the simpler sponges (Olynthus).

The Evolution of Man — Volume 1 Ernst Heinrich Philipp August Haeckel 1876

Without going into the difficult question of the origin of this stem, we must emphasise the fact that the vertebrate stem has no direct affinity whatever to five of the other ten stems; these five isolated phyla are the sponges, cnidaria, molluscs, articulates, and echinoderms.

The Evolution of Man — Volume 1 Ernst Heinrich Philipp August Haeckel 1876

There are four stems belonging to the coelenteria: the gastraeads ( "primitive-gut animals"), sponges, cnidaria, and platodes.

The Evolution of Man — Volume 1 Ernst Heinrich Philipp August Haeckel 1876

This we find in the lower cnidaria and worms, as well as in the more highly-developed molluscs, echinoderms, articulates, and vertebrates.

The Evolution of Man — Volume 1 Ernst Heinrich Philipp August Haeckel 1876

It is certainly a fact of the greatest interest and instructiveness that animals of the most different stems -- vertebrates and tunicates, molluscs and articulates, echinoderms and annelids, cnidaria and sponges -- proceed from one and the same embryonic form.

The Evolution of Man — Volume 1 Ernst Heinrich Philipp August Haeckel 1876

In most of the cnidaria and many of the annelids (worm-like animals) they remain unchanged throughout life.

The Evolution of Man — Volume 1 Ernst Heinrich Philipp August Haeckel 1876