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Behavior and cellular morphology of the test cells during embryogenesis of the ascidian Halocynthia roretzi
Author(s) -
Satoh Noriyuki,
Numakunai Takaharu,
Hori Reiji
Publication year - 1982
Publication title -
journal of morphology
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.652
H-Index - 74
eISSN - 1097-4687
pISSN - 0362-2525
DOI - 10.1002/jmor.1051710209
Subject(s) - biology , filopodia , embryo , pseudopodia , embryogenesis , microbiology and biotechnology , cytoplasm , embryonic stem cell , elongation , morphology (biology) , anatomy , zoology , actin , genetics , materials science , ultimate tensile strength , metallurgy , gene
During the early stages of embryogenesis of the ascidian Halocynthia roretzi the test cells creep exclusively on the inner surface of the chorion. Concomitant with elongation of the embryonic tail, however, the test cells begin to gather around the embryo and finally cover the whole embryo. The time at which the test cells surround the embryo almost coincides with that of initiation of larval tunic formation. Scanning electron microscope observations revealed that the test cells extend numerous cytoplasmic processes or pseudopodia. During larval tunic formation, the test cells compose a net by intertwining their filopodia, and the cell net covers the whole embryo.