WebHydra, which are cnidarians, have a nerve net throughout their body. On the other hand, sea stars, which are echinoderms, have a nerve net in each arm, connected by a central radial nerve ring at the center. This is better suited to controlling more complex movements than a diffuse nerve net. WebDipterans are endopterygotes, insects that undergo radical metamorphosis. They belong to the Mecopterida, alongside the Mecoptera, Siphonaptera, Lepidoptera and Trichoptera. [5] [6] The possession of a single pair of …

Ctenophora - Definition, Classification, Digestive System and …

Weban organism that consists of more than one cell type ex.) filamentous cyanobacterium . when did true multicellularity occur ( in plants, fungi and animals)? ... sensory flask cells of the sponge evolved into neurons of the ctenophora. how many times have plants, fungi and metazoa independently evolved ... WebCtenophores are medusoid gelatinous animals, which generally have two tentacles for capturing prey and eight ciliary comb rows on their outer surface for locomotion. The nervous systems of ctenophores are organized into diffuse nerve nets, which show some local tract-like accumulations below the ciliary comb rows and around the mouth and … north fl obgyn fleming island

Ctenophore marine invertebrate Britannica

The Tentaculata are divided into the following eight orders: [60] Cydippida, egg-shaped animals with long tentacles [21] Lobata, with paired thick lobes [21] Platyctenida, flattened animals that live on or near the sea-bed; most lack combs as adults, and use their pharynges as... Ganeshida, with a ... See more Ctenophora comprise a phylum of marine invertebrates, commonly known as comb jellies, that inhabit sea waters worldwide. They are notable for the groups of cilia they use for swimming (commonly referred to as "combs"), and … See more Distribution Ctenophores are found in most marine environments: from polar waters to the tropics; near coasts and in mid-ocean; from the surface waters to the ocean depths. The best-understood are the genera Pleurobrachia, … See more Despite their fragile, gelatinous bodies, fossils thought to represent ctenophores – apparently with no tentacles but many more comb-rows than modern forms – have been found in See more Among animal phyla, the Ctenophores are more complex than sponges, about as complex as cnidarians (jellyfish, sea anemones, etc.), and less complex than bilaterians (which … See more For a phylum with relatively few species, ctenophores have a wide range of body plans. Coastal species need to be tough enough to withstand waves and swirling sediment particles, while some oceanic species are so fragile that it is very difficult to capture them … See more The number of known living ctenophore species is uncertain since many of those named and formally described have turned out to be identical to species known under other scientific … See more • Gelatinous zooplankton See more WebDec 23, 2008 · Ctenophores move through the water by beating their comb rows — they are the largest animals to move entirely by ciliary movements — but they also have a complex array of definitive muscle cells. This contrasts with cnidarian medusae, which lack individual muscle cells and move by ‘pumping’ pulsations of myoepithelial sheets of cells. http://www.tolweb.org/tree?group=Ctenophora north float st george