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Search Results: 1 - 10 of 5858 matches for " land snails "
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Zoogeografía de los gastrópodos terrestres de la región oriental de San Luis Potosí, México
Correa Sandoval,Alfonso;
Revista de Biología Tropical , 1999,
Abstract: the land snails of the eastern region of san luis potosí, méxico were surveyed (june, 1995 - august, 1996). this region has much topographic and climatic variation. samples (161) were obtained in 48 localities. the main zoogeographic groups of were the endemic (32.18%: 28 species and three subspecies) and the neotropical (27.59%: 24 species and five subspecies) gastropods. the family spiraxidae has the largest number of endemic species (16). the eastern sierra madre has the largest number of species in the region.
Los moluscos terrestres (Mollusca: Gastropoda) de Costa Rica: clasificación, distribución y conservación
Barrientos Llosa,Zaidett;
Revista de Biología Tropical , 2010,
Abstract: terrestrial mollusks (mollusca: gastropoda) of costa rica: classification, distribution and conservation. terrestrial mollusks are poorly known worldwide. the country has 183 reported species, 30% endemic and 7% are probably extinct. about 400 species are expected to inhabit the country. biology, ecology, distribution, genetics and other areas of research are unknown for more than 95% of the species. the most diverse families are spiraxidae, orthalicidae and subulinidae. however, the family that may have more species is euconulidae. euconulids inhabit the highlands, where less work has been done. the study of species of highlands will also rise the endemism rate. future taxonomic, biological and ecological work should consider their low vagility, tendency to produce new taxa in sympatry, specific microhabitat requirements, hermaphroditism, high evolutionary rate (10% per million years), and divergence between species (2 to 30%). urgent studies to protect the costa rican malacofauna include: distribution, abundance, effect of land use and climate changes on populations. rev. biol. trop. 58 (4): 1165-1175. epub 2010 december 01.
Zoogeografía de los gastrópodos terrestres de la región oriental de San Luis Potosí, México
Alfonso Correa Sandoval
Revista de Biología Tropical , 1999,
Abstract: Se estudiaron (Junio, 1995 a Agosto, 1996) los caracoles terrestres de la región oriental de San Luis Potosí, México. Esta región posee una gran variación topográfica y climática. Los muestreos (161) se realizaron en 48 localidades. Los principales componentes zoogeográficos de los gastrópodos terrestres fueron el endémico (32.18%: 28 especies y tres subespecies) y el neotropical (27.59 %: 24 especies y cinco subespecies). Spiraxidae fue la familia con más endemismos (16). La Sierra Madre Oriental posee el mayor número de especies en la región. The land snails of the eastern region of San Luis Potosí, México were surveyed (June, 1995 - August, 1996). This region has much topographic and climatic variation. Samples (161) were obtained in 48 localities. The main zoogeographic groups of were the endemic (32.18%: 28 species and three subspecies) and the neotropical (27.59%: 24 species and five subspecies) gastropods. The family Spiraxidae has the largest number of endemic species (16). The Eastern Sierra Madre has the largest number of species in the region.
Assessment of Antimicrobial Activity and Healing Potential of Mucous Secretion of Achatina fulica
Santana,Wagno Alcantara; Melo,Cláudia Moura de; Cardoso,Juliana Cordeiro; Pereira-Filho,Rose Nely; Rabelo,Alessandra Silva; Reis,Francisco Prado; Albuquerque-Júnior,Ricardo Luiz Cavalcanti de;
International Journal of Morphology , 2012, DOI: 10.4067/S0717-95022012000200001
Abstract: achatina fulica's secretion has been recently related to antibacterial, antifungal, and cicatricial properties, and it is influenced by the kind of food offered. therefore, this study investigated the healing potential of dressing films based on mucous secretion of achatina fulica. thus, surgical wounds performed in black wistar rats were dressed with films based on collagen, and on mucous secretion of a. fulica fed with lactuca sativa; undresses worked as wounds control. after 3, 7, 14 and 21 days the animals were euthanized, and the wounds were microscopically evaluated. on the 3rd and 7th days dressing films based on mucus provided acceleration of the formation maturation of granulation tissue, better epithelization rates, and more rapid replacement of type iii for type i collagen fibers. on the 14th and 21st days, these dressings induced more intense deposition and better architectural disposition of type i collagen fibers, and hastened the regeneration of cutaneous phaneros. dressings obtained from a. fulica fed with lactuca sativa provided the most expressive results. this study suggests that films produced with mucous secretion of a. fulica can be successfully employed as wound dressing, particularly if snails are fed with lactuca sativa.
Dos géneros nuevos de caracoles terrestres (Stylommatophora: Arionacea) de Chile
Vargas-Almonacid,Patricio; Stuardo,José R;
Revista de Biología Tropical , 2007,
Abstract: two new genera of land snails (stylommatophora: arionacea) from chile. we describe two new genera of land molluscs found under wet leaf litter in isolated fragments of a secondary native forest at the hualpén botanical park (36o45′-36o49′ s, 73o9′-73o13′ w), university of concepción, chile. the new taxa are pichikadi gen.n., of punctidae, and chellius gen.n., of charopidae, with the following new species: pichikadi hualpensis sp.n., and chellius piramidalis sp.n. english diagnosis are presented for all taxa, together with an english identification key and english versions of figure captions and table headings. to facilitate subsequent studies and interpretations, we follow recent authors in using mainly shell characters, an approach that has favored the present taxonomic stability of the world?s land micromollusca. the diagnosis and observations are complemented with a key for the species of these families inhabiting continental chile. rev. biol. trop. 55 (2): 693-708. epub 2007 june, 29.
Une collection de référence pour la malacofaune terrestre de France
Olivier Gargominy,Theo E. J. Ripken
MalaCo , 2011,
Abstract: In order to facilitate the work of field biologists and to promote the use of the most recent accepted taxonomic concepts and names, a dedicated reference collection of continental molluscs is available at the National Museum of Natural History of Paris. Following the updated checklist, we publish here figures of 309 terminal taxa of which 300, i.e. 72% of the French land snail fauna, are curated under this reference collection.
Preliminary study of the terrestrial gastropods diversity (Gastropoda: Stylomatophora) from Cefa Nature Park (NW of Romania)
Matilda C. Amza,Milca Petrovici,Voichi?a Gheoca
Advances in Environmental Sciences , 2011,
Abstract: The paper presents the first investigation over the terrestrial gastropods fauna from Cefa Nature Park (NW of Romania). The samples were collected every month (April 2009 - March 2010), using hand collection, soil collection from 25x25 cm squares which were processed in the laboratory through sieving as well as installation of Barber traps. On the whole, 22 species were determined (without slugs), of which dominant were the Holarctic species (31.82%), followed by the European elements (27.27%). The identified species belong to the following categories: mesophilous, hydrophilous and mesohydrophilous, with close percentages (27.27 % – 31.82 %). The least of the elements are those of mesoxerophilous (13.64%). The dams habitat between fishponds supports the largest diversity of terrestrial gastropods (21 species), followed by the forest one (9 species) and finally the grasslands one (5 species). The species with the highest frequency (100%) met during every month of investigations, was Vallonia pulchella, for the dams habitat between fishponds. All these results argues once more the importance and the need to protect these artificial habitats (like the dams between fishponds), which often undergo large anthrop pressures resulting from the piscicultural management (repeated setting on fire in order to stop the expansion of reed surfaces). It is also necessary to continue to investigate the gastropods fauna both in Cefa Nature Park, and in the protected area to which this park has common border and habitat (K r s-Maros National Park – Hungary).
Terrestrial molluscs of Pemba Island, Zanzibar, Tanzania, and its status as an “oceanic” island
Ben Rowson,Ben Warren,Christine Ngereza
ZooKeys , 2010, DOI: 10.3897/zookeys.70.762
Abstract: Pemba is thought to have had a longer and/or stronger history of isolation than its better-known counterpart, Unguja. The extent to which the biota support this hypothesis of greater oceanicity have been debated. Here, Pemba’s terrestrial mollusc (“land-snail”) fauna is surveyed and reviewed for the first time. We find at best equivocal evidence for the following hallmarks of greater oceanicity: impoverishment, imbalance, and a high rate of endemism. At least 49 species are present, families are represented in typical proportions, and there are only between two and four island-endemic species - i.e. a 4% to 8% rate of endemism. For land-snails, isolation thus seems to have been short (Pleistocene) or, if longer, weak. Nevertheless, Pemba does host endemic and globally rare species. Forty-five percent of the species found, including most of these, is restricted to forest reserves, with Ngezi Forest Reserve particularly rich. A further 45% are able to tolerate the island’s woody cultivated habitats. One new snail species (Cyclophoridae: Cyathopoma) and one new slug species (Urocyclidae: Dendrolimax pro tem.) are described. New data and illustrations are provided for other taxa.
Molecular evidence for the polyphyly of Bostryx (Gastropoda: Bulimulidae) and genetic diversity of Bostryx aguilari
Jorge L. Ramirez,Rina Ramírez
Zoologia (Curitiba) , 2013,
Abstract: Bostryx is largely distributed in Andean Valleys and Lomas formations along the coast of Peru and Chile. One species, Bostryx aguilari, is restricted to Lomas formations located in the Department of Lima (Peru). The use of genetic information has become essential in phylogenetic and population studies with conservation purposes. Considering the rapid degradation of desert ecosystems, which threatens the survival of vulnerable species, the aim of this study was, first, to resolve evolutionary relationships within Bostryx and to determine the position of Bostryx within the Bulimulidae, and second, to survey the genetic diversity of Bostryx aguilari, a species considered rare. Sequences of the mitochondrial 16S rRNA and nuclear rRNA regions were obtained for 12 and 11 species of Bulimulidae, respectively, including seven species of Bostryx. Sequences of the 16S rRNA gene were obtained for 14 individuals (from four different populations) of Bostryx aguilari. Phylogenetic reconstructions were carried out using Neighbor-Joining, Maximum Parsimony, Maximum Likelihood and Bayesian Inference methods. The monophyly of Bostryx was not supported. In our results, B. solutus (type species of Bostryx) grouped only with B. aguilari, B. conspersus, B. modestus, B. scalariformis and B. sordidus, forming a monophyletic group that is strongly supported in all analyses. In case the taxonomy of Bostryx is reviewed in the future, this group should keep the generic name. Bostryx aguilari was found to have both low genetic diversity and small population size. We recommend that conservation efforts should be increased in Lomas ecosystems to ensure the survival of B. aguilari, and a large number of other rare species restricted to Lomas.
Cargols terrestres (Gastropoda, Stylommatophora) del Parc Natural de la Muntanya de Montserrat (Barcelona, NE península Ibèrica).
Bros, Vicen?
Arxius de Miscel-lània Zoològica , 2006,
Abstract: Land snails (Gastropoda, Stylommatophora) in the Natural Park of Montserrat (Barcelona, NE Iberian Peninsula).- The inventory of 73 land snails in the Natural Park of Montserrat was updated following the review of 130 publications. Planned field study was also conducted in areas of different habitats on the Montserrat mountain to provide a preliminary description of the communities of land snails in the study area. A total of 342 samples of land snails were studied and 50 species were identified. The most frequent were Pomatias elegans, Helicigona lapicida, Pseudotachea splendida, Abida polyodon and Otala punctata. In this region of the prelittoral Catalan mountain range, the level of endemism was high for Abida secale bofilli, Montserratina bofilliana and Xerocrassa montserratensis. The results of the field work extend the faunistic catalogue of the Natural Park of Montserrat to include references to Hygromia cinctella, Microxeromagna lowei, Paralaoma servilis and Punctum pygmaeum in the area. Finally, investigation and conservation programmes are suggested for the endemic species Xerocrassa montserratensis, protected by the Plan for Areas of Natural Interest (PEIN) approved by Decree 328/1992.
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