parent_taxon anasca
___MASK38___ ( also known as the Polyzoa , Ectoprocta or commonly as ___MASK1___ animals ), are a phylum of aquatic invertebrate animals . Typically about long , they are filter feeders that sieve food particles out of the water using a retractable lophophore , a " crown " of tentacles lined with cilia . Most marine species live in tropical waters , but a few occur in oceanic trenches , and others are found in polar waters . One class lives only in a variety of freshwater environments , and a few members of a mostly marine class prefer brackish water . Over 4 , 000 living species are known . One genus is solitary and the rest are colonial . Scrupariina is a sub - order under order ___MASK88___ . The structure of the individual zooids is generally simple , with an uncalcified , flexible frontal wall . The Siphonophorae or ___MASK73___ , the siphonophores , are an order of the ___MASK44___ , a class of marine animals belonging to the phylum Cnidaria . Although a siphonophore appears to be a single organism , each specimen is actually a colony composed of highly specialised individual animals called zooids . Most colonies are long , thin , transparent pelagic floaters . Some siphonophores superficially resemble jellyfish , one example being the venomous Portuguese man o ' war (" Physalia ___MASK90___ "). ___MASK76___ are a class of Bryozoans . ___MASK76___ are sessile , mostly marine organisms and grow on the surfaces of rocks , kelp , and in some cases on animals , like fish . Zooids are cylindrical or flattened . The ___MASK63___ is protruded by action of muscles pulling on the frontal wall . This order includes the majority of living bryozoan species . A zooid or zoöid is a single ___MASK66___ that is part of a colonial ___MASK66___ . Zooids are multicellular ; their structure is similar to that of other solitary animals . The zooids can either be directly connected by tissue ( e . g . corals , ___MASK45___ , Siphonophorae , Pyrosome or Ectoprocta ) or share a common exoskeleton ( e . g . Bryozoa or ___MASK40___ ). The colonial organism as a whole is called a " zoon " , plural " zoa " ( from Greek " zòon "  meaning ___MASK66___ ; plural " zòa ",  ). The ___MASK63___ is a characteristic feeding organ possessed by four major groups of animals : the Brachiopoda , ___MASK38___ , Hyolitha , and ___MASK24___ , which collectively constitute the Lophophorata . All lophophores are found in aquatic organisms . ___MASK40___ is a clade of small worm - shaped animals . They belong to the Hemichordata , and live in secreted tubes on the ocean floor . ___MASK40___ feed by filtering plankton out of the water with the help of cilia attached to tentacles . There are about 30 known living species in the group . ___MASK88___ ( accepted name Cheilostomatida ), an order of Bryozoa in the class Gymnolaemata , are exclusively marine , colonial invertebrate animals . Cheilostome colonies are composed of calcium carbonate and grow on a variety of surfaces , including rocks , shells , seagrass and kelps . The colony shapes range from simple encrusting sheets to erect branching and even unattached forms . As in other bryozoan groups , each colony is composed of a few to thousands of individual polypides , which has a U - shaped gut , and no respiratory , circulatory , or nerve system . Unique among bryozoans , cheilostome polypides are housed in a box - shaped zooids , which do not grow larger once the zooid is mature . The opening of through which the polypide protrudes is protected by a calcareous or chitinous lidlike structure , an operculum . Cheilostomes possess avicularia , which have modified the operculum into a range of mandibles ( possibly for defense ) or hair - like setae ( possibly for cleaning ). The polypide in bryozoans encompasses most of the organs and tissues of each individual zooid . This includes the tentacles , tentacle sheath , U - shaped digestive tract , musculature and nerve cells . It is housed in the zooidal exoskeleton , which in cyclostomes is tubular and in cheilostomes is ___MASK92___ - shaped . Flustrina is a suborder under the order ___MASK88___ of gymnolaematan Bryozoa ( sea mats ). The structure of the individual zooids is generally simple , a box - like chamber of calcium carbonate , the polypides reaching out through an uncalcified flexible frontal wall , often surrounded by numerous spines . Like in other gymnolaematans , their lophophore is protruded by muscles that pull on the frontal wall of the zooid . Animals are multicellular , eukaryotic organisms of the kingdom Animalia ( also called ___MASK35___ ). The animal kingdom emerged as a basal clade within Apoikozoa as a sister of the choanoflagellates . Sponges are the most basal clade of animals . Animals are motile , meaning they can move spontaneously and independently at some point in their lives . Their body plan eventually becomes fixed as they develop , although some undergo a process of metamorphosis later in their lives . All animals are heterotrophs : they must ingest other organisms or their products for sustenance . Corals are marine invertebrates in the class ___MASK11___ of phylum ___MASK6___ . They typically live in compact colonies of many identical individual polyps . The group includes the important reef builders that inhabit tropical oceans and secrete calcium carbonate to form a hard skeleton . Anasca was a bryozoan sub - order under class Cheilostomida defined by the lack of an ascus in each zooid . It is no longer an accepted taxonomic grouping as it is considered a polyphyletic and / or paraphyletic grouping . The group is now subdivided into the suborders Inovicellata , Scrupariina , Malacostega , and Flustrina .