리테르개멍게 (Halocynthia hilgendorfi ritteri)의 초기발생
Early Development of the Ascidian (Halocynthia hilgendorfi ritteri)
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Abstract
Early development and metamorphosis of the ascidian (Halocynthia hilgendorfi ritteri) were investigated from fertilized egg. The samples were collected in the coastal waters of Yongdam, northwest of Jeju Island in November 2002. H. hilgendorfi ritteri was solitary ascidian and produced spheral eggs with egg size ranging from 0.33±0.01mm. On the outer surface of the vitelline coat are attached many follicle cells. At 21.0±0.5℃ of water temperature, first cleavage took place in about 1.5hrs after fertilization, and gastrulation followed in about 12.5 hrs. The formation of tailbud embryos and free swimming larvae were observed 13.3hrs and 20.5hrs after fertilization, respectively. The size of newly hatched tadpole larva was 1.30-1.45 mm, the larva swam for 2hrs to 14hrs. At 4hrs after hatching, the palpi were lost and tail absorption began with an abrupt rupture of the anterior end of the notochord. At 17-18hrs after hatching, tail completely absorption and remained trunk. The coniform adhesive papilla began protrusion at 30hrs after hatching. The oral and atrial siphon formed at 6-7 days after settlement. At 17-18 days after settlement, metamorphosed the larvae developed into protoascidian of which the external morphology was similar to their adult.
참고문헌 (18)
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