. Journal of Agricultural Research. the embryonic region. The parasite bodyis entirely surrounded by a cyst of host tissue. G.—Section through the twinning stage of the parasite body, which takes placeabout six days after oviposition. The embryonic region has divided, two of the fournuclei passing to each half of the twin embryonic regions. The division of the twoparanuclear masses forms four similar masses. Two paranuclear masses and one ofthe embryonic regions with its two nuclei thus form a germ, and the twin germsbecome separated structurally after the trophamnion infiltrates between the t
. Journal of Agricultural Research. the embryonic region. The parasite bodyis entirely surrounded by a cyst of host tissue. G.—Section through the twinning stage of the parasite body, which takes placeabout six days after oviposition. The embryonic region has divided, two of the fournuclei passing to each half of the twin embryonic regions. The division of the twoparanuclear masses forms four similar masses. Two paranuclear masses and one ofthe embryonic regions with its two nuclei thus form a germ, and the twin germsbecome separated structurally after the trophamnion infiltrates between the twoembryonic regions. X2,2oo. H.—A twin germ surrounded by host tissue with the two embryonic regions stillencased in a common trophamnion. X 1,100 (half the magnification of the precedingfigures). I.—Parasite body which is developing monembryonically while encased in a partof the host salivary gland. Four of its eight embryonic nuclei are shown in thissection. X 1,100. Twinning and Monembryony in Platygaster hiemalis Plate 3.
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