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・ Cyclosorus
・ Cyclosorus interruptus
・ Cyclospasm
・ Cyclospora
・ Cyclospora cayetanensis
・ Cyclosporiasis
・ Cyclosporins
・ Cyclosportive
・ Cyclostationary process
・ Cyclosternum
・ Cyclosternum fasciatum
・ Cyclosternum pentalore
・ Cyclosticta
・ Cyclostoma
・ Cyclostomata
Cyclostomatida
・ Cyclostomatida (family list)
・ Cyclostome
・ Cyclostomella
・ Cyclostratigraphy
・ Cyclostrema
・ Cyclostrema amabile
・ Cyclostrema archeri
・ Cyclostrema bibi
・ Cyclostrema bushi
・ Cyclostrema cancellatum
・ Cyclostrema carinatum
・ Cyclostrema charmophron
・ Cyclostrema cingulatum
・ Cyclostrema crassiolatum


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Cyclostomatida : ウィキペディア英語版
Cyclostomatida

Cyclostomatida, or cyclostomes, are an ancient order of stenolaemate bryozoans which first appeared in the Lower Ordovician. It consists of 7+ suborders, 59+ families, 373+ genera, and 666+ species. The cyclostome bryozoans were dominant in the Mesozoic; since that era, they have decreased. Currently, cyclostomes seldom constitute more than 20% of the species recorded in regional bryozoan faunas.
==Taxonomy==
Traditionally, cyclostomes have been divided into two groups according to skeletal organization. In free-walled (or double-walled) cyclostomes, the exterior frontal walls of the zooids are uncalcified; autozooids have either a polygonal aperture bounded by vertical interior walls, or alternatively a subcircular aperture in species with kenozooids filling the spaces between the autozooids. By contrast, fixed-walled (or single-walled) cyclostomes have much of the exterior frontal wall calcified; autozooids normally have a subcircular aperture located at or close to the frontal wall.

抄文引用元・出典: フリー百科事典『 ウィキペディア(Wikipedia)
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