One of the three basic types of tissue structure (groove system) unique to marine sponges. This is the simplest type, consisting of an erect hollow cluster. It is found in the genus Polytrichum, etc., of the class Calcarea. All sponges show this type in the early stages of development, and then develop into the somewhat more complex Polytrichum type (such as Polytrichum) or the more complex Leucon type. Source: Encyclopaedia Britannica Concise Encyclopedia About Encyclopaedia Britannica Concise Encyclopedia Information |
海綿動物に特有な組織構造 (溝系) の3つの基本型の一つ。最も単純な型で,直立した中空状の集りから成る。石灰海綿綱のカゴアミカイメン属などにみられる。また,すべての海綿が発生の初期にはこの型を示し,やがて,やや複雑なサイコン (シコン) 型 (ケツボカイメン属など) や複雑なロイコン (リューコン) 型を形成していく。
出典 ブリタニカ国際大百科事典 小項目事典ブリタニカ国際大百科事典 小項目事典について 情報 |
…The Muses are depicted holding objects, but thes...
There is a group G whose elements are linear fract...
Year of death: November 16, 1722 (December 23, 172...
A mountain in the northeast of Fengxiang County, S...
A domestic dog that originated in England (illustr...
...There are various theories about the origin of...
〘Noun〙 (also "Utazekkyo") From the Kanbu...
...It is common to have grooves on the sides that...
Different marketing methods are used in different ...
...The first book is on musical organization, the...
A pension is paid to an insured person according ...
A lake, also called a lagoon or lagoon, is a land...
It is a term that indicates the genetic and biolog...
…On the central pillar of the right-hand portal s...
...Emperors stayed here every year from May to Se...