The flatworms, flat worms, Platyhelminthes, or platyhelminths are a phylum of relatively simple bilaterian, unsegmented, soft-bodied invertebrates. Unlike other bilaterians, they are acoelomates, and have no specialized circulatory and respiratory organs, which restricts them to having flattened shapes that allow oxygen and nutrients to pass through their bodies by diffusion. The digestive cavity has only one opening for both ingestion and egestion ; as a result, the food cannot be processed continuously.
Charles Wachsmuth was a German-American paleontologist and businessman. After emigrating to the United States, he became a renowned expert on the Paleozoic fossil animals known as crinoids. He and his collaborator, Frank Springer, published numerous articles on the subject and built an exceptional collection of crinoid fossils. The culmination of his work was the two-volume "Monograph of the North American Crinoidea Camerata", coauthored with Springer and published posthumously in 1897.
Pipunculidae is a family of flies (Diptera) commonly termed big-headed flies, a reference to the large (holoptic) eyes, which cover nearly the entire head. The family is found worldwide and more than 1300 species have been described.
Nemertodermatida is a class of Acoelomorpha, comprising 18 species of millimetre-sized turbellariform, mostly interstitial worms.
Childia is a genus of acoels in the family Mecynostomidae.
Jujubinus dispar is a species of sea snail, a marine gastropod mollusk in the family Trochidae, the top snails.
Jujubinus guanchus is a species of sea snail, a marine gastropod mollusk in the family Trochidae, the top snails.
Jujubinus poppei is a species of sea snail, a marine gastropod mollusk in the family Trochidae, the top snails.
Jujubinus vexationis is a species of sea snail, a marine gastropod mollusk in the family Trochidae, the top snails.
Jujubinus is a genus of sea snails, marine gastropod mollusks in the family Trochidae, the top snails.
Isodiametridae is a family of acoels.
Rhabditophora is a class of flatworms. It includes all parasitic flatworms and most free-living species that were previously grouped in the now obsolete class Turbellaria. Therefore, it contains the majority of the species in the phylum Platyhelminthes, excluding only the catenulids, to which they appear to be the sister group.
Proseriata is an order of free-living flatworms in the class Rhabditophora with over 400 species described worldwide.
Sabussowia is a genus of flatworms belonging to the family Cercyridae.
Kyllinia is a genus of small, predatory sea snails, marine gastropod mollusks in the family Mangeliidae.
Monocelididae is family of marine turbellarian flatworms in the order Proseriata, sub order Lithophora.
Archimonocelididae is a family of flatworms belonging to the order Proseriata.
Gyratrix hermaphroditus is a species of rhabdocoel flatworms in the family Polycystididae.
Monocelis is a genus of flatworms belonging to the family Monocelididae.
Sterreria is a genus of worms belonging to the family Nemertodermatidae.
