日本産普通多足類の後胚発生XII : ヒラタヤスデの生活史(2)

概要

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(1) The eggs of Bazillozonium nodulosum are creamy white in colour and 0.7mm in diameter. Egg-laying is usually found to occur in the middle of May, and the incubation period of the eggs at 13°-24℃ varies from 3 to 5 weeks. The brooding males leave the larvae after hatching. (2) The first larvae are milky white or pale white. Four pairs of developed legs and six tergites are present. Body length measures from 1.3-1.7mm, and antennae had five articles. The caudal end of the last tergital keel is not thrust out beyond the distal end of the anal valves. (3) The 9th and 10th pairs of walking legs in the male transform directly and gradually into gonopods. The progress of transformation appears in 24 or more individual variations of body segments. Both pairs of anterior and posterior gonopod consist of seven segments, and they agree with the segments of the walking legs in number.
社団法人日本動物学会の論文
1962-09-15