Orthonectida is a small phylum of poorly known parasites of marine invertebrates that are among the simplest of multi-cellular organisms. Members of this phylum are known as orthonectids.
The Turbellaria are one of the traditional sub-divisions of the phylum Platyhelminthes (flatworms), and include all the sub-groups that are not exclusively parasitic. There are about 4,500 species, which range from 1 mm (0.039 in) to large freshwater forms more than 500 mm (20 in) long or terrestrial species like Bipalium kewense which can reach 600 mm (24 in) in length. All the larger forms are flat with ribbon-like or leaf-like shapes, since their lack of respiratory and circulatory systems means that they have to rely on diffusion for internal transport of metabolites. However, many of the smaller forms are round in cross section. Most are predators, and all live in water or in moist terrestrial environments. Most forms reproduce sexually and with few exceptions all are simultaneous hermaphrodites.
Mark Francis O'Meara is an American professional golfer. He was a tournament winner on the PGA Tour and around the world from the mid-1980s to the late 1990s. He spent nearly 200 weeks in the top-10 of the Official World Golf Ranking from their debut in 1986 to 2000. He was inducted into the World Golf Hall of Fame in 2015.
Xenoturbella is a genus of very simple bilaterians up to a few centimeters long. It contains a small number of marine benthic worm-like species.
The Acoela or acoels are an order of small and simple invertebrates in the phylum Xenacoelomorpha, a basal Bilaterian group, which resemble flatworms. Historically they were treated as an order of turbellarian flatworms.
Marine invertebrates are the invertebrates that live in marine habitats. Invertebrate is a blanket term that includes all animals apart from the vertebrate members of the chordate phylum. Invertebrates lack a vertebral column, and some have evolved a shell or a hard exoskeleton. As on land and in the air, marine invertebrates have a large variety of body plans, and have been categorised into over 30 phyla. They make up most of the macroscopic life in the oceans.
Nemertodermatida is a class of Acoela, comprising 18 species of millimetre-sized 'tubellariform', mostly interstitial worms.
Dakuidae is a family of Acoela. It contains a three genera, containing the following species:
Hallangiidae is a family of Acoela.
Isodiametridae is a family of Acoela.
Life form – entity that is living, such as plants (flora) and animals (fauna). It is estimated that more than 99% of all species that ever existed on Earth, amounting to over five billion species, are extinct.
Actinoposthia beklemischevi is an acoel flatworm that belongs to the Actinoposthiidae family. It forms part of the Acoelomorpha subphylum, which is part of the Xenacoelomorpha phylum that is in the Animalia kingdom.
Capitata is a suborder of Hydrozoa, a class of marine invertebrates belonging to the phylum Cnidaria.
Aplanulata is a suborder of Hydrozoa, a class of marine and freshwater invertebrates belonging to the phylum Cnidaria.
Otto Steinböck was an Austrian zoologist.
Xenoturbella bocki is a marine benthic worm-like species from the genus Xenoturbella. It is found in saltwater sea floor habitats off the coast of Europe, predominantly Sweden. It was the first species in the genus discovered. Initially it was collected by Swedish zoologist Sixten Bock in 1915, and described in 1949 by Swedish zoologist Einar Westblad. The unusual digestive structure of this species, in which a single opening is used to eat food and excrete waste, has led to considerable study and controversy as to its classification. It is a bottom-dwelling, burrowing carnivore that eats mollusks.
Monocelididae is family of marine turbellarian flatworms in the order Proseriata, sub order Lithophora.
