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Question
One of the following water canal systems has been named on the basis of the structure of larval water vascular system of Spongilla. It is ___________
One of the following water canal systems has been named on the basis of the structure of larval water vascular system of Spongilla. It is ___________
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Solution
The correct option is D Rhagonoid
In Spongilla, the larva is different from the parenchymula and is called as 'rhagon larva'. It has rhagon type of canal system and thus, it is called as rhagonoid canal system. It has a tent-like body with a broad flat base called as hypophare and a conical body called as spongophare, with a narrow upper end on which osculum is located. It has flagellated chambers that opens to the outside by ostia and into the spongocoel by apopyles. This canal system is primitive as compared to the diplodal type and when the larva grows, it is transformed to diplodal type. Thus, the correct answer is option D.
In Spongilla, the larva is different from the parenchymula and is called as 'rhagon larva'. It has rhagon type of canal system and thus, it is called as rhagonoid canal system. It has a tent-like body with a broad flat base called as hypophare and a conical body called as spongophare, with a narrow upper end on which osculum is located. It has flagellated chambers that opens to the outside by ostia and into the spongocoel by apopyles. This canal system is primitive as compared to the diplodal type and when the larva grows, it is transformed to diplodal type. Thus, the correct answer is option D.
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