. Ecological animal geography; an authorized, rewritten edition based on Tiergeographie auf ockologischer grundlage . Fig. 21 tively poorly developed bristle bundles, in connection with their sand- boring habits, and were formerly united into the group Sedentaria. A curious companion of the worms is Balanoglossus (Fig. 22), a relative of the chordates rather than of the worms, which lives in a U-shaped tube open at both ends, and puts out piles of excrement like those of Arenicola. The mollusks of this habitat have much in common. They are uniformly thin-shelled, flat, smooth-surfaced, have a
. Ecological animal geography; an authorized, rewritten edition based on Tiergeographie auf ockologischer grundlage . Fig. 21 tively poorly developed bristle bundles, in connection with their sand- boring habits, and were formerly united into the group Sedentaria. A curious companion of the worms is Balanoglossus (Fig. 22), a relative of the chordates rather than of the worms, which lives in a U-shaped tube open at both ends, and puts out piles of excrement like those of Arenicola. The mollusks of this habitat have much in common. They are uniformly thin-shelled, flat, smooth-surfaced, have a well-developed foot, without a byssus gland, and have siphons formed by the union of the posterior edges of the mantle into more or less elongate tubes, occasionally united, which establish the connection with the surface. The ventral siphon is the intake, bringing in the food and oxygen in the water, while the dorsal cares for the outgoing current with the
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Keywords: ., bookcentury1900, bookcollectionbiodive, booksubjectanimalecology
