单词	leucon
释义	leucon /ˈluːkɒn / noun Zoology A sponge of a grade of structure of the most complex type, composed of a mass of flagellated chambers and water canals. Compare with ascon and sycon.Ascon, sycon, and leucon are levels of complexity that grade one into the other.... Leucon are extremely localised outside the study region whereas Oenanthe flu has declined throughout lowland England due to water pollution. Leucon are split into three groups when compared with pairwise p-distances. Derivatives leuconoid adjective ... It is the only class with asconoid and syconoid construction, and has sponges with leuconoid construction as well. Organization does not necessarily relate to phylogeny; for example, the leuconoid structure was evolved independently several times.
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