Anodonta sentence example

anodonta
  • Sometimes this gland is found in the young and not in the adult (Anodonta, Unio, Cyclas).
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  • As an example of the organization of a Lamellibranch, we shall review the structure of the common pond-mussel or swan mussel (Anodonta cygnea), comparing it with other Lamellibranchia.
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  • In this way the notches d, e of the hinder part of the mantle-skirt of Anodonta are in the siphonate forms converted into two separate holes, the edges of the mantle being elsewhere fused together along this hinder margin.
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  • It is the approximate equality in the size of the anterior and posterior adductor muscles which led to the name Isomya for the group to which Anodonta belongs.
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  • In removing the valves of the shell from an Anodonta, it is necessary not only to cut through the muscular attachment of the body-wall 4 ?"
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  • The corresponding parts are recognizable in Anodonta.
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  • Whilst the valves of the shell are equal in Anodonta we find in many Lamellibranchs (Ostraea, Chama, Corbula, &c.) one valve larger, and the other smaller and sometimes flat, whilst the larger shell may be fixed to rock or to stones (Ostraea, &c.).
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  • Let us now examine the organs which lie beneath the mantle-skirt of Anodonta, and are bathed by the current of water which circulates through it.
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  • The foot thus exposed in Anodonta is a simple muscular tongue-like organ.
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  • Other Lamellibranchs may have a larger foot relatively than has Anodonta.
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  • The gill-plates have a structure very different from that of the labial tentacles, and one which in Anodonta is singularly complicated as compared with the condition presented by these organs in some other Lamellibranchs, and with what must have been their original condition in the ancestors of the whole series of living Lamellibranchia.
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  • In Anodonta, besides being thickened, the skeletal substance of the filament develops a specially dense, rod-like body on each side of each filament.
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  • Although the structured of the ctenidium is thus highly complicated in Anodonta, it is yet more so in some of the siphonate genera of Lamellibranchs.
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  • Other points in the modification of the typical ctenidium must be noted in order to understand the ctenidium of Anodonta.
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  • This is difficult to see in Anodonta, but if the mantle-skirt be entirely cleared away, and if the dependent lamellae which spring from the ctenidial axis be carefully cropped so as to leave the axis itself intact, we obtain the form shown in fig.
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  • The actual condition in Anodonta at the region where the gills begin anteriorly is shown in fig.
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  • It is important, because such a concrescence is by no means universal, and does not occur, for example, in Mytilus or in Arca; further, because when its occurrence is once appreciated, the reduction of the gill-plates of Anodonta to the plume-type of the simplest ctenidium presents no difficulty; and, lastly, it has importance in reference to its physiological significance.
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  • Hind region of foot in Ano- Region altogether posterior to the foot in Anodonta.
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  • The alimentary canal of Anodonta is shown in fig.
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  • The coil of the intestine in Anodonta is similar to that of other Lamellibranchs.
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  • In Anodonta the blood is driven by the ventricle through the arteries into vessel-like spaces.
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  • The renal organs may be more ramified in other Lamellibranchs than they are in Anodonta.
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  • Hence, except for the formation of a urino-genital groove, the apertures are placed as they are in Anodonta.
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  • Anodonta has no eyes of any sort, and the tentacles on the mantle edge are limited to its posterior border.
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  • The gonads of Anodonta are placed in distinct male and female individuals.
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  • In Anodonta the eggs pass into the space between the two lamellae of the outer gill-plate, and are there FIG.
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  • In Mytilus the two apertures are on a common papilla, in other cases the two apertures are as in Anodonta.
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  • The early larva of Anodonta is not unlike the trochosphere of other Lamellibranchs, but the mouth is wanting.
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  • The fresh-water Mussels, Anodonta cygnea, Unio pictorum, and Unio margaritiferus belong to the order Eulamellibranchia of Lamellibranch Molluscs, in which the anterior and posterior adductor muscles are equally developed.
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  • Anodonta cygnea, the Pond Mussel or Swan Mussel, appears to be entirely without economic importance.
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  • The genital papilla of the female acquires a great development during the breeding season and becomes produced into a tube nearly as long as the fish itself; this acts as an ovipositor by means of which the comparatively few and large eggs (3 millimetres in diameter) are introduced through the gaping valves between the branchiae of pond mussels (Unio and Anodonta), where, after being inseminated, they undergo their development, the fry leaving their host about a month later.
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