Lophophore sentence example

lophophore
  • 3, 4) the interior of the dorsal valve is variously furrowed to receive the lophophore folded in two or more lobes.
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  • Its two lips fusing together at the corners of the mouth are prolonged into the socalled arms. These arms, which together form the lophophore, TV.
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  • The great arm-sinus of each side of the lophophore lies beneath the fold or lip which together with the tentacles forms the ciliated groove in which the mouth opens.
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  • The small arm-sinus runs along the arms of the lophophore at the base of the tentacles, and gives off a blind diverticulum into each of these.
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  • - Diagrammatic section through an arm of the lophophore of Crania.
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  • It is a remarkable fact that in Discinisca, although the vessels to the lophophore are arranged as in other Brachiopods, no trace of a heart or of the posterior vessels has as yet been discovered.
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  • The lophophore and stalk are largely composed of this tissue.
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  • Lip of lophophore.
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  • The chief arm-nerve traverses the lophophore, being situated between the great arm-sinus and the base of the lip (figs.
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  • Like the chief armnerve, this strand runs through the lophophore, parallel indeed with the former except near the middle line, where it passes ventrally to the oesophagus.
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  • The lophophore is supplied by yet a third nerve, the under arm-nerve, which is less clearly defined than the others, and resembles a moderate aggregation of the nerve fibrils, which seem everywhere to underlie the ectoderm, and which in a few cases are gathered up into nerves.
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  • The chaetae drop off, and the lophophore is believed to arise from thickenings which appear in the dorsal mantle lobe.
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  • By this time the eyes have disappeared, the four bundles of chaetae have dropped off, and the lophophore has begun to appear as an outgrowth of the dorsal mantle lobe.
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  • Lophophore supported by calcareous loops, &c. [[Families.
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  • Gymnolaemata (Allman).- Lophophore circular, with no epistome.
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  • - Lophophore horse-shoe shaped, or in Fredericella circular.
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  • The polypide consists of a "lophophore" bearing a series of ciliated tentacles by which Diatoms and other microscopic bodies are collected as food, of a U-shaped alimentary canal, and of a central nervous system.
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  • The lophophore is a simple circle in all Polyzoa except in the Phylactolaemata, where it typically has the form of a horse shoe outlined by the bases of the tentacles.
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  • The cavities of the hollow tentacles open into a circular canal which surrounds the oesophagus at the base of the lophophore.
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  • At the tip of the introvert the mouth opens, and is surrounded in Sipunculus by a funnel-shaped, ciliated lophophore (figs.
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  • On the surface of the funnel-shaped lophophore are numerous ciliated grooves, and each of the tentacles in the tentaculated forms has a similar groove directed towards the mouth.
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  • A so-called heart lies on the dorsal surface of the oesophagus; it is closed behind, but in front it opens into a circumoesophageal ring, which gives off vessels into the lophophore and tentacles.
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  • The contraction of this heart, which is not rhythmic, brings about the expansion of the tentacles and lophophore.
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  • 1, Lophophore.
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  • 2, 3) the two ends of the lophophore are rolled into spirals.
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  • a, The horseshoe-shaped lophophore.
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  • - Dorsal View of Phoronis australis, showing the spirally coiled ends of the lophophore.
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  • There is, however, a considerable amount of resemblance between the lophophore of Phoronis australis, with its spirally twisted ends, and that of a typical Brachiopod; nor do the structural details of the adult Brachiopods forbid the view that they may be related to Phoronis.
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  • N, Post-oral nerve-tract at base of lophophore.
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  • It will be noticed that the lophophore of Phoronis is, on this assumption, a derivative of the collar just as it is in the Pterobranchia.
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  • This tuft of tentacles is called the lophophore and can be retracted quickly by a strong muscle fixed into the envelope.
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  • places it has sunk into the con Passing from the middle line outwards they are - (i.) the median pallial nerve to the middle of the dorsal mantle; (ii.) numerous small nerves - the circum-oesophageal commissures - which pass round the oesophagus to the chief arm-nerve or supra-oesophageal ganglion; (iii.) the under arm-nerve to the lophophore and its muscles; (iv.) the lateral pallial nerve to the sides of the dorsal mantle.
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  • The free end of the long vermiform body ends in a horseshoe-shaped " lophophore," or tentaclebearing region (fig.
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  • It has, moreover, been shown (see especially Goodrich, 5) that shortly before its metamorphosis, Actinotrocha develops a coelomic space which lies immediately in front of the oblique septum, and gives rise later to the cavity of the lophophore and tentacles.
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