centrolecithal egg


centrolecithal egg
(ARTHROPODA)
A type of arthropod egg in which the nucleus is located centrally in a small amount of nonyolky cytoplasm surrounded by a large mass of yolk until fertilized; when nuclear divisions begin the nuclei migrate to the periphery to proceed with superficial cleavage, with the yolk remaining central; see isolecithal egg, mesolecithal egg, telolecithal egg.

Online Dictionary of Invertebrate Zoology. . 2005.

Look at other dictionaries:

  • centrolecithal egg — centrolecithal egg. См. центролецитальное яйцо. (Источник: «Англо русский толковый словарь генетических терминов». Арефьев В.А., Лисовенко Л.А., Москва: Изд во ВНИРО, 1995 г.) …   Молекулярная биология и генетика. Толковый словарь.

  • centrolecithal — cen tro*lec i*thal (s[e^]n tr[ o]*l[e^]s [i^]*thal), a. [Gr. ke ntron center + le kiqos yolk of an egg.] (Biol.) Having the food yolk placed at the center of the ovum, segmentation being either regular or unequal. Balfour. [1913 Webster] …   The Collaborative International Dictionary of English

  • 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

  • egg — The female sexual cell, or gamete; after fertilization and fusion of the pronuclei it is a zygote and no longer an e.. In reptiles and birds, the e. is provided with a protective shell, membranes, albumin, and yolk for the nourishment of the …   Medical dictionary

  • centrolecithal — Denoting an ovum in which the deutoplasm accumulates centrally. [centro + G. lekithos, yolk] * * * cen·tro·lec·i·thal .sen trō les ə thəl adj of an egg having the yolk massed centrally and surrounded by a thin layer of clear cytoplasm compare… …   Medical dictionary

  • centrolecithal — |sen.(ˌ)trō|lesəthəl adjective Etymology: centr + Greek lekithos yolk of an egg + English al of arthropod eggs : having the yolk massed centrally and surrounded by a thin layer of clear cytoplasm * * * /sen troh les euh theuhl/, adj. Embryol.… …   Useful english dictionary

  • oligolecithal egg — An egg with a small amount of yolk; isolecithal; see centrolecithal egg, telolecithal egg …   Dictionary of invertebrate zoology

  • isolecithal egg — An ova with yolk granules randomly distributed through the cell; a small amount of yolk; an oligolecithal egg; see centrolecithal egg …   Dictionary of invertebrate zoology

  • telolecithal egg — An egg cell with abundant yolk concentrated toward the lower side of the cell; see centrolecithal egg …   Dictionary of invertebrate zoology

  • mesolecithal egg — Eggs with moderate yolk content; see centrolecithal egg …   Dictionary of invertebrate zoology


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