| 41. | Usually water enters the mantle cavity through the inhalant siphon, moves over the gills, and leaves through the exhalant siphon.
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| 42. | A range of invertebrates is also host to trichodinid infections, including the surfaces of copepods and the mantle cavity of molluscs.
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| 43. | These are often a mating pair which enter through the large siphon and live within the mantle cavity of the horse clam.
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| 44. | Inside the mantle cavity, beyond the siphon, lies the visceral mass, which is covered by a thin, membranous epidermis.
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| 45. | The gills hang down into the mantle cavity, the wall of which provides a secondary respiratory surface being well supplied with capillaries.
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| 46. | During development, the mantle cavity of the larva curls up and closes, creating the worm-like form of the adult.
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| 47. | The fertilized eggs will develop into veliger larvae and will stay in the females mantle cavity for 10 12 days for further development.
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| 48. | The siphon sucks in water to the mantle cavity, and may be long enough to extend through the substrate in burrowing species.
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| 49. | The commensal species typically live in the gill or mantle cavities of their hosts, while the parasites live inside the digestive system.
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| 50. | The heart is divided into two equal halves, each with its own nephridial excretory organs, which empty into the mantle cavity.
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