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- Q4173968 subject Q8317110.
- Q4173968 abstract "Phylactolaemata is a class of the phylum Bryozoa whose members live only in freshwater environments. Like all bryozoans, they filter feed by means of an extensible "crown" of ciliated tentacles called a lophophore. They live in colonies, each of which consists of clones of the founding member. Unlike those of some marine bryozoans, phylactolaemate colonies consist of only one type of zooid, the feeding forms known as autozooids. These are supported by an unmineralized "exoskeleton" made of gelatinous material or protein, secreted by the zooids.The class contains only one extant order, Plumatellida.Phylactolaemate colonies reproduce sexually, and each member is a simultaneous hermaphrodite that functions as both male and female. They also reproduce asexually by a method that is unique among bryozoans and enables a colony's lineage to survive the variable and uncertain conditions of freshwater environments. Throughout summer and autumn they produce disc-shaped statoblasts, masses of cells that function as "survival pods" rather like the gemmules of sponges. Statoblasts form on the funiculus (cord) connected to the parent's gut, which nourishes them. As they grow, statoblasts develop protective bivalve-like shells made of chitin. When they mature, some types stick to the parent colony, some fall to the bottom, some contain air spaces that enable them to float, and some remain in the parent's cystid (outer casing) to re-build the colony if it dies. Statoblasts can remain dormant for considerable periods, and while dormant can survive harsh conditions such as freezing and desiccation. They can be transported across long distances by animals, floating vegetation, currents and winds. When conditions improve, the valves of the shell separate and the cells inside develop into a zooid that tries to form a new colony. A study estimated that one group of colonies in a patch 1 square metre (11 sq ft) produced 800,000 statoblasts.".
- Q4173968 thumbnail Bryozoa.jpg?width=300.
- Q4173968 wikiPageWikiLink Q102192.
- Q4173968 wikiPageWikiLink Q120877.
- Q4173968 wikiPageWikiLink Q1252491.
- Q4173968 wikiPageWikiLink Q144410.
- Q4173968 wikiPageWikiLink Q148134.
- Q4173968 wikiPageWikiLink Q161219.
- Q4173968 wikiPageWikiLink Q179254.
- Q4173968 wikiPageWikiLink Q180436.
- Q4173968 wikiPageWikiLink Q182353.
- Q4173968 wikiPageWikiLink Q1869774.
- Q4173968 wikiPageWikiLink Q18960.
- Q4173968 wikiPageWikiLink Q1898509.
- Q4173968 wikiPageWikiLink Q191944.
- Q4173968 wikiPageWikiLink Q220160.
- Q4173968 wikiPageWikiLink Q303479.
- Q4173968 wikiPageWikiLink Q3511295.
- Q4173968 wikiPageWikiLink Q36602.
- Q4173968 wikiPageWikiLink Q37517.
- Q4173968 wikiPageWikiLink Q38348.
- Q4173968 wikiPageWikiLink Q4173968.
- Q4173968 wikiPageWikiLink Q610457.
- Q4173968 wikiPageWikiLink Q642923.
- Q4173968 wikiPageWikiLink Q6864767.
- Q4173968 wikiPageWikiLink Q8054.
- Q4173968 wikiPageWikiLink Q8317110.
- Q4173968 comment "Phylactolaemata is a class of the phylum Bryozoa whose members live only in freshwater environments. Like all bryozoans, they filter feed by means of an extensible "crown" of ciliated tentacles called a lophophore. They live in colonies, each of which consists of clones of the founding member. Unlike those of some marine bryozoans, phylactolaemate colonies consist of only one type of zooid, the feeding forms known as autozooids.".
- Q4173968 label "Phylactolaemata".
- Q4173968 depiction Bryozoa.jpg.