The shapes and colors of the shells vary in an almost incredible, but it gastropods that it is poss

The shapes and colors of the shells vary in an almost incredible, but it gastropods that it is possible to observe the development of almost infinite. The simplest type of shell has a symmetrical shape, more or less conical, specialty beverage of virginia as in common patella.Molto often these exoskeletons calacarei however, tend to wrap spiral with the formation of laps or ravines, increasingly larger. This spiral structure, is in most cases right-handed, but in talun species can be left-handed. In any casola spiral resulting from the process specialty beverage of virginia of growth of the shell, specialty beverage of virginia repeats a line, whose radius of curvature increases with trend logoartmico. An uneven winding of the spiral, door shells form tubolosa, while if it occurs only on one floor have shells shaped disc. Often, specialty beverage of virginia it happens, that the last turn of the spiral has a greater prevalence on the other, and in this case, the appearance of the shell, since the coil is very low, is given by the profile of the last lap. As this can be done in many forms, we will have some type structures conical, oval, cylindrical, etc.. If the spiral is clearly specialty beverage of virginia evident, with numerous ravines and highlighted, specialty beverage of virginia we will have a turreted shell. If then, at the same time, the base of the shell extends into a channel, we will have a fusiform shape. But in addition to the form, the shells are also distinguished by the ornamentation: ribs, ribs, spines, tubercles. This phenomenon is related to a particular activity of secretion of the mantle. When the secretion is regular specialty beverage of virginia and uniform, the shells have a smooth surface, as in Cyprea, when instead the secretion is uneven will be adorned. The decoration can be a sculpture spiralese if it is only in the sense elicodaile, or if it occurs perpendicular to the axial direction elicodaile. But in addition to possessing strange shapes related to their organic food growth, the shells have also straordinare colors: specialty beverage of virginia many are related to physical phenomena such as refraction of light on mother of pearl, but most are due to the same pigment specialty beverage of virginia that the animal produces or assimilates through food. The mantle in fact, has long borders, chromogenic special glands that secrete the pigments, which, in turn, are fixed on the calcium carbonate of the shell, specialty beverage of virginia and thus provide the various colors. specialty beverage of virginia If the glands located on the mantle are in continuous series, is continuing their secretion, the shell will be monochrome, but if they continued secretion and are far apart, you will have spiral designs or even dashed or dotted if the activity specialty beverage of virginia of secretion is periodic . Francesca L.
Amphibians (3) arachnids (3) Communication of Editors specialty beverage of virginia (1) Echinoderms (3) Snails (8) The cnidarians (5) Insects (3) Cephalopods (4) Mammals (6) Fish (3) Porifera (4) Reptiles (5) Birds (3)