Muitos detalhes da anatomia de L. A concha adulta de L. Croix , nas Ilhas Virgens. Estimativas demonstram que a taxa de mortalidade de L. Trazida por exploradores, as conchas de L. Foto de uma concha real de L. Vista ventral de uma concha de L. Malacolog 4. Roo ". Caribbean Journal of Science 35 : CRC Press. The Veliger. The superfamily Strombacea from Western Atlantic. Antonio A. Recreatio mentis, et oculi in observatione animalium testaceorum Italico sermone primum proposita Latine oblata centum additis testaceorum iconibus Romae, Ex typographia Varesii.
Arquivos de Zoologia , 37 2 : Molecular Phylogenetics and Evolution. Bulletin of Marine Science , 15 2 : Cell and Tissue Research 2 : Seashells of Portugal ". The living marine resources of the Western Central Atlantic.
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Volume 1 : Introduction, molluscs, crustaceans, hagfishes, sharks, batoid fishes, and chimaeras. Southern Region Aquaculture Center. Consultado em 22 de junho de Eustatius Marine Park. New York: St. The embryonic shell or protoconch is a rounded structure and fits like a cap to the embryo body. The cephalic sac is a pulsating structure attached to the embryo near the foot Figs 1 and 2. The podocyst is a sac-like structure attached to the foot Figs 1 and 2 and rest on the shell and it is apparent after the formation of the cephalic sac. At this pre-torsional age Fig. Both the cephalic sacand podocyst are very prominent.
The embryonic shell is still rounded and cap like but now expanded and very visible. Torsion has taken place and the embryonic shell is prominent Fig. Cephalic sac and podocyst are gradually disappearing and by 7 th day both of these two structures had disappeared. The embryonic shell or protoconch which is apparent at about day 2 becomes spirally coiled on day 5 Fig. The embryo has one whorl of spirally coiled shell and resembles a small snail. At two days old the shell has been formed Fig. At two to three days old Fig. At three to four days Fig. At five days, the shell of the post torsional embryo shows sculpturing, is spirally coiled Fig.
More spirals coils are added to the shell so that at hatching the young snails has two to three whorls. The period between the time the clutch is laid and when the eggs hatch in L. Limicolaria martensiana is therefore oviparous during the rainy season and ovoviviparous during the dry season OWINY Ovoviviparity was not observed in L. The cephalic sac is the first to be formed in the embryo of L.
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The cephalic sac was absent in all specimens of L. It has also been described as a pedal sinus in H. The exact time when torsion occurred was not observed during this study, however by the 4th day, the embryos were showing evidence of torsion. The production of an embryonic shell, the protoconch, in L. The embryonic shell in L. In addition to mechanical support, the function of the calcified egg shell is to supply the developing embryo with calcium to form the embryonic shell by the time of hatching TOMPA a, b, , Coiling was observed in late post torsional shell in L.
Embryos need more calcium than can be provided in the egg albumen and many terrestrial snails are known to cover their terrestrial eggs with soil rich in calcium TOMPA Gastropods on land: phylogeny, diversity and adaptive morphology, p. The Biology of Terrestrial Molluscs. Possible benefits of egg cannibalism in hatchlings of the land snail Arianta arbustorum L. Functional Ecology 4 : Proximate factors influencing egg cannibalism in the land snail Arianta arbustorum Pulmonata, Helicidae.
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Oecologia 70 : Studies in the Achatininae, a group of African land snails. The podocyst in pulmonate evolution. Malacological Review 5 : Initiation, calcification and form of larval archaeogastropod shells. Journal of Morphology : Reproduction, Nutrition and Development 37 : Within-clutch egg cannibalism variability in hatchlings of the land snail Helixaspersa Pulmonata: Stylommatophora : influence of two proximate factors. More information about this seller Contact this seller 8.
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Spiral of Light: Portuguese Music for Strings and Marimba
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More information about this seller Contact this seller 9. Published by. About this Item:. Muy buen estado. More information about this seller Contact this seller Published by Centro Cultural Clavijero, Morelia From: The Book Collector, Inc. Soft cover. Condition: Near Fine. First edition limited to copies. The scope of this work was built on more than thirty academics coming from multiple disciplines art history, sociology, philosophy, political science, anthropology. The presentations of papers and monographs have resulted in this present exposition culminating of these works presented.
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Seller Inventory A Condition: New. Published by Editorial Epesa, Madrid About this Item: Editorial Epesa, Madrid, Condition: Aceptable. Cubierta fatigada, reparada por anterior propietario. First edition. Various photographs of arid, desolate and desert-like landscapes. Preceded by an introductory essay on the artst. Published by ELO About this Item: ELO, Couverture souple. Condition: Neuf. Fotos e planos pelo Autor illustrator. Edition originale. About this Item: pp. Tela editorial. Planeta, S.
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About this Item: Peninsula. Estado: BIEN. First Separate Edition. A fine copy in the original printed card wrappers as issued. Separate from Monumenta. Publicacao da Comissao dos Monumentos Nacionais de Mocambique 1.