. "Gregarines (Gregarinassina), comprising archigregarines, eugregarines and neogregarines, are thought to be a group of deep-branching apicomplexans which parasitize invertebrates and urochordates, and that are usually considered to be of no practical importance. Recent phylogenetic analyses, however, have pointed out their close affinity with Cryptosporidium, and have drawn attention to this enigmatic group. Our ultrastructural analyses revealed that cryptosporidian attachment strategy is very similar to that of the eugregarines. Gregarines exhibit an enormous diversity in cell architecture and dimensions, depending on their parasitic strategy and environment. They seem to be a perfect example of a concomitant evolution between a group of parasites and their hosts. It has been assumed that they appeared in marine polychaetes and the most primitive are the archigregarines." . "14310" . "RIV/00216224:14310/10:00047588!RIV11-MSM-14310___" . "1"^^ . . . . "Valigurov\u00E1, Andrea" . . "Gregarines: Humble subtenants or highly sophisticated parasites?" . "gregarines; invertebrates; parasite; Apicomplexa"@en . "S" . "Gregarines: Humble subtenants or highly sophisticated parasites?"@en . . "261021" . . . "1"^^ . "[0D4FD41C9359]" . . . . "Gregarines (Gregarinassina), comprising archigregarines, eugregarines and neogregarines, are thought to be a group of deep-branching apicomplexans which parasitize invertebrates and urochordates, and that are usually considered to be of no practical importance. Recent phylogenetic analyses, however, have pointed out their close affinity with Cryptosporidium, and have drawn attention to this enigmatic group. Our ultrastructural analyses revealed that cryptosporidian attachment strategy is very similar to that of the eugregarines. Gregarines exhibit an enormous diversity in cell architecture and dimensions, depending on their parasitic strategy and environment. They seem to be a perfect example of a concomitant evolution between a group of parasites and their hosts. It has been assumed that they appeared in marine polychaetes and the most primitive are the archigregarines."@en . . "Gregarines: Humble subtenants or highly sophisticated parasites?" . "Gregarines: Humble subtenants or highly sophisticated parasites?"@en . . . . "RIV/00216224:14310/10:00047588" .