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Some observations on the reproduction in the isopod, Armadillidium vulgare



Some observations on the reproduction in the isopod, Armadillidium vulgare



Jour Coll Arts And Sci Chiba Univ Nat Sci Ser 1(4): 244-250



The degree of ovarian maturity had little effect upon the performance of copulation. Eggs in females which had copulated ranged 0.18-0.60 mm in diameter. Only those with eggs smaller than 0.15 mm did not copulate. About 1/6 of ovariectomized females further copulated for 4-5 days but not thereafter. The sperm was stored in the middle part of oviduct and was seldom carried to other parts, or attracted. to ovaries, until pushed into the oostegite by downcoming mature ova. A single copulation enabled most females to lay developable eggs once or twice, or rarely 3 times. Some 60% of the females which had not copulated after hibernation laid sterile eggs, while the rest for unknown reasons laid developable eggs. Neither the aqueous extract nor the acetone powder of ova could give to sperm suspension any gamont-like effects such as activation, aggregation, agglutination. The youngest animals were all female in outlook and repeated molting without much change in shape until grown to 3.0 mm long when the endopodite of the 1st thoracic appendage was a little elongated in males. Both the exo- and endopodites of the 1st thoracic were more elongated in 3.5 mm long males. The sex ratios as judged by bodily outlook changed from 100:0 (female:male, in individuals less than 2.8 mm long) to 100:17, 100:103 and 100:178 as the animals grew in length to 3.0-3.5 mm, 3.5-5.0 mm and 10-15 mm (maturity) respectively.

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Accession: 023632833

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