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・ Spires Academy
・ Spires of Naples
・ Spires of Spirit
・ Spires That in the Sunset Rise
・ Spiret Peak
・ Spirgai
・ Spiric section
・ Spiral valves of Heister
・ Spiral vegetable slicer
・ Spiral Walls Containing Autumns of Light
・ Spiral watertube boiler
・ Spiral wave
・ Spiral Zone
・ Spirale
・ SpiralFrog
Spiralia
・ Spiralinella
・ Spiralinella incerta
・ Spiralinella marthinae
・ Spiralinella spiralis
・ Spiraling
・ Spiralisigna
・ Spiralisigna acidna
・ Spiralisigna angusta
・ Spiralisigna gloriae
・ Spiralisigna minutissima
・ Spiralisigna pseudofluctuosa
・ Spiralisigna subpumilata
・ Spiralix rayi
・ Spiralling


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Spiralia : ウィキペディア英語版
Spiralia

The Spiralia are a morphologically diverse clade of animals, including within their number of molluscs, annelids, platyhelminths and other phyla. The Spiralian clade of animals are more commonly referred to as the Lophotrochozoa, although whether these two terms are equivalent is debated, as noted further below. More uncontroversially, the term ''Spiralia'' is applied to those phyla that exhibit canonical spiralian cleavage.
Spiral cleavage, from which this group draws its name, is a pattern of early development found in most (but not all) members of the Lophotrochozoa.
==Distribution of spiralian development across phylogeny==

Members of the molluscs, annelids, platyhelminths and nemerteans have all been shown to exhibit spiral cleavage in its classical form. Other Lophotrochozoan phyla (rotifers, brachiopods, phoronids, gastrotrichs, and bryozoans) are also said to display a derived form of spiral cleavage in at least a portion of their constituent species, although evidence for this is sparse.

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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