ectolecithal
adj. [Gr. ektos, outside; lekithos, yolk of an egg]
(PLATYHELMINTHES: Turbellaria)
Having cleavage modified by a special condition whereby yolk is stored in separate cells surrounding the oocytes as opposed to entolecithal as seen in other animal phyla whose eggs contain yolk.

Online Dictionary of Invertebrate Zoology. . 2005.

Look at other dictionaries:

  • Ectolecithal — Ec to*lec i*thal, a. [Ecto + Gr. ? the yolk of an egg.] (Biol.) Having the food yolk, at the commencement of segmentation, in a peripheral position, and the cleavage process confined to the center of the egg; as, ectolecithal ova. [1913 Webster] …   The Collaborative International Dictionary of English

  • ectolecithal — ec·to·lec·i·thal (ek″to lesґĭ thəl) [ecto + lecithal] having the yolk situated peripherally, as in flatworm eggs …   Medical dictionary

  • ectolecithal — ec·to·lecithal …   English syllables

  • ectolecithal — |ektō+ adjective Etymology: International Scientific Vocabulary ect + lecith + al : centrolecithal …   Useful english dictionary

  • Egg cleavage — Segmentation Seg men*ta tion, n. The act or process of dividing into segments; specifically (Biol.), a self division into segments as a result of growth; cell cleavage; cell multiplication; endogenous cell formation. [1913 Webster] {Segmentation… …   The Collaborative International Dictionary of English

  • regular segmentation — Segmentation Seg men*ta tion, n. The act or process of dividing into segments; specifically (Biol.), a self division into segments as a result of growth; cell cleavage; cell multiplication; endogenous cell formation. [1913 Webster] {Segmentation… …   The Collaborative International Dictionary of English

  • Segmentation — Seg men*ta tion, n. The act or process of dividing into segments; specifically (Biol.), a self division into segments as a result of growth; cell cleavage; cell multiplication; endogenous cell formation. [1913 Webster] {Segmentation cavity} (Biol …   The Collaborative International Dictionary of English

  • Segmentation cavity — Segmentation Seg men*ta tion, n. The act or process of dividing into segments; specifically (Biol.), a self division into segments as a result of growth; cell cleavage; cell multiplication; endogenous cell formation. [1913 Webster] {Segmentation… …   The Collaborative International Dictionary of English

  • Segmentation nucleus — Segmentation Seg men*ta tion, n. The act or process of dividing into segments; specifically (Biol.), a self division into segments as a result of growth; cell cleavage; cell multiplication; endogenous cell formation. [1913 Webster] {Segmentation… …   The Collaborative International Dictionary of English

  • Segmentation of the ovum — Segmentation Seg men*ta tion, n. The act or process of dividing into segments; specifically (Biol.), a self division into segments as a result of growth; cell cleavage; cell multiplication; endogenous cell formation. [1913 Webster] {Segmentation… …   The Collaborative International Dictionary of English

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