Names used for nemertean genera and species of the world are listed alpha-betically, with their original description citations, synonymy and current taxonomic status. Though many remain inadequately… Expand
An evaluation of the systematic significance of several anatomical characters leads to the suggestion that the primitive heteronemertean organization included a proboscis with three muscle layers, a foregut with neither splanchnic muscles nor subepithelial glands, and a blood system not developed into a vascular plexus around the foreGut.Expand
Investigation of the feeding mechanism, structure of the gut, and digestive physiology of the European lobster Homarus gammarus has shown that the mandibles do not possess a masticatory function, merely serving to grip food morsels during the tearing process effected by the pulling action of the third maxillipeds.Expand
Acid and alkaline phosphatases occur in the hepatopancreatic cells and are apparently concerned with several stages in the digestive cycle, including the synthesis and secretion of digestive enzymes, the subsequent absorption of the products of extracellular digestion, and the active transport of metabolites across the cell membranes.Expand
A re‐examination of all the known species of Geonemertes has shown that two major groups can be distinguished on the basis of morphological characters, and a key to the terrestrial, brackish‐water and marine nemertean species described in the present paper is provided.Expand
It is suggested that ancestral enoplans possessed a rhynchocoel wall containing two muscle layers and a simple “protopolystiliferous” type of proboscis armature, and that this ancestral pool gave rise to two distinct evolutionary lineages, one leading to cratenemertid, group 2 terrestrial and freshwater, and polystilifierous hoplonemerteans, the other to the typical modern monostiliferously forms.Expand
Nine species of lineid heteronemerteans are recorded from the Great Barrier Reef province of Australia. Six of these are new species, including four new genera, and are fully described and… Expand
Morphological characteristics of the terrestrial and freshwater paramonostiliferous nemerteans are compared and the possible evolutionary relationships of the plectonemertid genera are discussed and a diagnosis of the family is provided.Expand
The low genetic identities found in intrageneric comparisons of species found in this study have been found in other studies on nemerteans and may indicate systematic problems within these groups or other phenomena such as morphological stasis.Expand
Twenty-three species representative of 15 heteronemertean genera are recorded from Antarctic and Subantarctic waters south oflatitude 50oS and only Parapolia grytvikenensis Wheeler, Cerebratulus malvini Wheeler, Chilineus glandulosa (Burger) and Huilkia ushuaiensis Serna de Esteban & Moretto can at present be accepted as valid, although incompletely described, taxa.Expand