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Micropyle

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micropyle [′mī·krə‚pīl]
(botany)
A minute opening in the integument at the tip of an ovule through which the pollen tube commonly enters; persists in the seed as an opening or a scar between the hilum and point of radicle.
Micropyle 

(1) An opening in the membrane of the eggs of insects, arachnids, some mollusks, fishes, and a number of other animals, through which the spermatozoon penetrates. (2) An opening in the apex of the ovule in higher seed plants, through which the pollen tube penetrates during pollination. The micropyle is formed because the integuments surrounding the ovule are unattached.

Micropyle 

the canal in the integument or integuments of a plant through which the ovule is penetrated in gymnosperms by pollen grains and in angiosperms by pollen tubes. The external opening of the micropyle may be observed on the surface of a mature seed in the form of a dark dot.
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9 [micro]m diameter) that has a fairly conspicuous opening or micropyle to enable sperm penetration.
Breeding cycle and early development of the keyhole limpet Fissurella ... by Perez, Margarita C.; Gonzalez, Maria L.; Lopez, Daniel A. / Journal of Shellfish Research
In teleosts, the only common aspect is the absence of an acrosome, which has been related to the presence of a micropyle in the egg (Riehl, 1997).
Environmental contaminant-induced spermatozoa anomalies in fish ... by Abdelmeguid, Nabila E.; Kheirallah, Abdel-Moneim M.; Matta, Cecil A.; Abdel-Moneim, Ashraf M. / International Journal of Applied Environmental Sciences
57) oblong, bearing conspicuous micropyle at narrow end, opposite end is papillose; seed coat thick, woody, comprising nearly 20--25% of the diameter of the seed; empty individuals are dark brown to black in color, some specimens are reddish in color due to the reflectance of white endosperm within the seed; examination of endosperm from seeds shows cells intact; embryo present (Fig.
An illustrated catalogue of macroscopic subfossils from ... by Swinehart, Anthony L. / Proceedings of the Indiana Academy of Science
 
 
 
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