Mollusca 6: Bivalvia, Volume 3

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Shell biconvex, inequilateral and nearly equivalve. The left valve is a little larger and slightly more convex. The commissure in both valves is slightly undulated with some waves long and others short. The umbonal beak is central to terminal, and acute. From there the valves gradually increase in length towards the ventral area, which is the wider part of the valve, with a slightly curved margin. The anterior side is extended a short distance, where the convexity gradually decreases, ending in an acute angle formed by both valves.

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The umbonal area is long and narrow, with a concave anterior margin. These specimens show that the ornamentation and keel change with age, disappearing in the adult, probably because of erosion.

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The study was made on a few almost complete valves and ten fragments of different size. The name of the new species Trichites pueblaensis , refers to the state of Puebla, where the fossils were found, plus the latin suffix ensis, which means place. The fossils were collected on the thick layers of sandstone, on the lower part of the column, corresponding to a stratigraphic unit, still not formally named, but provisionally called Coatepec sandstone. The red conglomerate and the Matzitzi Formation are below this unit. Trichites plotii Lhuyd is the species most similar to T.

They resemble each other in the large size, the thick fibrous wall, lack of ornamentation, and somewhat in the shape, because both species are biconvex and nearly equivalves.

Treatise on invertebrate paleontology. Part N, Mollusca 6 : Vol. 3. Bivalvia - Google книги

However, they differ in that T. The most notable difference is that the Mexican species presents a short depressed extension of the anterior margin of both valves. This species is among the largest of the genus and the measurements are comparable to those of the new species, since a fragmentary specimen has an actual height of mm, so that the calculated complete height was probably between to mm. Trichites thurmanni Choffat, from the Upper Jurassic Malm of Lisboa, Portugal has a similar, smooth surface but differs in outline and the markedly inequivalve shell, the right valve shell flat or concave; the shell is also smaller.

Trichites granulatus Sowerby , p. Trichites saussurei Thurmann , p 25 was described from the Kimmeridgian of Yonne, France.

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  5. It differs from the Mexican species because it is inequivalve and has prominent radial ridges. We express our gratitude and admiration to the reviewers, Dr. Susana Damborenea and Dr. Nikolaus Malchus, who made an excellent work and contributed to the improvement of the article. Part N Mollusca, 6.

    Bertrand, pp. Isabella, in a voyage to the Arctic regions, in Ross, J. Lapidum aliorumque Fossilium Britannicorum singulari figura insignium: London, E Typographeo Clarendoniano, editio alterata, pp. Secundum classes, ordines, genera, species, cum characteribus, differentiis, synonymis, locis, Tomus I.

    Georg, pp. Laupp, pp. Arding, v. Servicios Personalizados Revista. Similares en SciELO. Historical background of Trichites as scientific name The earliest publication mentioning Trichites was by Plot in p. Yes Yes. Though the modern molluscs show quite a wide degree of adaptable variability in form, there are several basic anatomical characteristics that can be found in all or most of them. The body is divided into two functional regions, the head-foot and the visceral lump.

    The head-foot is the part you see most easily in slugs and snails.

    Mollusca 6: Bivalvia, Volume 3

    It is mostly a muscular organ covered in cilia and rich in mucous cells, which the mollusc uses to move around, it normally tapers to a tail at one end and has a head incorporated in the front. The head includes a mouth, eyes and tentacles, the last two may be much reduced or even absent. In those species with shells the head-foot can be drawn into the shell.

    The rest of the body is the visceral mass, this is entirely nonmuscular and contains the organs of digestion and reproduction, it includes the gonads, the kidney, the heart and the digestive diverticulum. Attached to the dorsal surface of the visceral mass is and hanging freely down the sides of it is the mantle, often called the skirt or pallium. There is a space between the mantle and the viseral mass, this space is greatest towards the rear of the animal where it is called the mantle cavity or the pallial cavity.

    The mantle cavity generally contains the gills or ctenidia, a water current, generated by beating cillia, enters the mantle cavity at the sides, passes over the gills and departs centrally, i. Near the head, just behind the mouth is a pair or more of ganglia and a nerve ring from which two nerve chords arise that reach out through the body. Molluscs are true coelomic animals, though the coelom they have is small, enclosing only the gonads and the heart where it is called the gonodial cavity and the pericardial cavity respectively.

    This then is the plan of a basic unevolved mollusc. This basic plan is changed and adapted, for the requirements of different lifestyles, almost beyond recognition in some of the 6 classes of Mollusca. Hopefully I will get something written about each class in the not too distant future. Conde, A.

    Biological Invasions , 12 3 , — Conrad, T. Journal of the Academy of Natural Sciences of Philadelphia, 7 2 , — Judah Dobson, Philadelphia, 89 pp. Proceedings of the Academy of Natural Sciences of Philadelphia , 4 6 , — Notes on shells.

    Proceedings of the Academy of Natural Sciences of Philadelphia , 12, — Cosel, R. Iberus , 13 1 , 1— Dall, W. Proceedings of the United States National Museum, 52 , — Proceedings of the United States National Museum, 56 , — Bulletin of the United States fish commission , 20 1 , — Darkina, S. Korean Journal of Malacology , 12 1 , 53— Defrance, M.


    In : Blainville, M. Paris, France, 32, pp. Dunker, W. Theodori Fischer, Kassel. Novitates Conchologicae. Abbildung und Beschreibung neuer Conchylien. Supplement 7.

    Classificação dos Moluscos - Zoologia - Biologia

    Cassellis Cattorum, Germay, pp. Fujie, T. Part I. Summary of the study of the genus Mya from Hokkaido. Part II. Geological and geographical distribution of fossil and recent species, genus Mya.


    Gollasch, S. Helgoland Marine Research , 60 2 , 84— Gould, A. Proceedings of the Boston Society of Natural History , 8, 14—32, 33— Gould and Lincoln, Boston, pp. Gray, J. In [multiauthored] Eastern Zoological Gallery , pp. In [multiauthored] Synopsis of the contents of the British Museum, ed. Woodfall and Son, London, p. A list of the genera of recent Mollusca: their synonyma and types. Proceedings of the Zoological Society of London , 15 , — Annals and Magazine of Natural History series 2 , 13 77 , — Habe, T.

    In : Kuroda, T.