Polyp-stage sentence example

  • In Trachylinae the development produces always a medusa, and there is no polyp-stage.
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  • The Trachylinae, on the other hand, are above all oceanic forms, and have no polyp-stage, and hence there is typically no alternation in their life-cycle.
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  • In Trachylinae the polyp-stage is passed over, and is represented only by the actinula as a transitory embryonic stage.
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  • This must not be taken to mean, however, that the medusa is derived from a sessile polyp; it must be regarded as a direct modification of the more ancient free actinula form, without primitively any intervening polyp-stage, such as has been introduced secondarily into the development of the Leptolinae and represents 'a revival, so to speak, of an ancestral form or larval stage, which has taken on a special role in the economy of the species.
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  • The possession of a polyp-stage by Limnocodium and Microhydra furnishes an argument against placing them in the Trachylinae.
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