Redlichia

Japanese: Redlichia
Redlichia

...The evolutionary trend is known to be microtau → isocau → macrotau. (1) Microtau type - Redlichia , Early Cambrian (2) Isocau type - Illaenus, Ordovician to Silurian (3) Macrotau type - Scutellum, Silurian to Devonian The head segment structure is found in the sella that forms the central axis, and a sellar groove and a sellar lobe are recognized. The former is originally a groove structure that completely crosses the sella, but as one of the evolutionary trends, the entire sella swells, so it often becomes discontinuous in the center, and becomes a pair of sellar grooves on the left and right. ...

*Some of the terminology that mentions "Redlichia" is listed below.

Source | Heibonsha World Encyclopedia 2nd Edition | Information

Japanese:

…進化の傾向としては,小尾→等尾→巨尾の向きが知られている。(1)小尾型――レドリキアRedlichia カンブリア紀前期(2)等尾型――イラエヌスIllaenus オルドビス紀~シルル紀(3)巨尾型――スクテルムScutellum シルル紀~デボン紀 頭部の体節構造は中軸部を形成する頭鞍に見いだされていて,頭鞍溝と頭鞍葉とが認められる。前者は,本来頭鞍を完全に横切る溝構造であるが,進化傾向の一つとして頭鞍全体がふくれるため,中央でしばしば不連続となり,左右で対をなす頭鞍溝となる。…

※「Redlichia」について言及している用語解説の一部を掲載しています。

出典|株式会社平凡社世界大百科事典 第2版について | 情報

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