15 research outputs found

    Regeneration in a Neotropical land planarian (Platyhelminthes, Tricladida)

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    Planarians are known for their ability to regenerate missing body parts. However, little is known about the regeneration ability of land planarians, especially regarding Neotropical species. Herein, we investigated the regeneration in the Neotropical land planarian Luteostriata abundans. Specimens were cut in two at different points along the body and monitored for 50 days. Larger and anterior pieces survived more than smaller posterior pieces. Anterior pieces that retained the pharynx continued to feed normally as intact animals, while posterior pieces that retained the pharynx lost its function temporarily. The growth rate was similar among all pieces across 50 days. Anterior mouthless pieces regenerated the pharynx and mouth significantly faster than posterior mouthless pieces. After 50 days, the relative position of the mouth along the body reached values close to intact animals in all regenerating pieces. In general, anterior pieces showed higher survival and regenerated faster than posterior fragments, which agrees with observations with other planarian species. However, surviving posterior pieces were able to retain the proportions of intact animals as well. Overall, our results suggest that L. abundans has a good regenerative capacity similar to many freshwater planarians

    ÔĽŅRegeneration in a Neotropical land planarian (Platyhelminthes, Tricladida)

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    Planarians are known for their ability to regenerate missing body parts. However, little is known about the regeneration ability of land planarians, especially regarding Neotropical species. Herein, we investigated the regeneration in the Neotropical land planarian Luteostriata abundans. Specimens were cut in two at different points along the body and monitored for 50 days. Larger and anterior pieces survived more than smaller posterior pieces. Anterior pieces that retained the pharynx continued to feed normally as intact animals, while posterior pieces that retained the pharynx lost its function temporarily. The growth rate was similar amongst all pieces across 50 days. Anterior mouthless pieces regenerated the pharynx and mouth significantly faster than posterior mouthless pieces. After 50 days, the relative position of the mouth along the body reached values close to intact animals in all regenerating pieces. In general, anterior pieces showed higher survival and regenerated faster than posterior fragments, which agrees with observations with other planarian species. However, surviving posterior pieces were able to retain the proportions of intact animals as well. Our results suggest that L. abundans has a good regenerative capacity similar to many freshwater planarians

    Transloca√ß√£o da brom√©lia epif√≠tica Vriesea incurvata: uma eficiente ferramenta para a restaura√ß√£o da biodiversidade na Floresta Atl√Ęntica

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    Micropropagation of epiphytic bromeliads associated to translocation may act as an important tool for conservation, restauration or mitigation initiatives. Vriesea incurvata is an epiphytic tank-forming bromeliad endemic to the Atlantic Forest, being an important species in gallery forest environments. Seeds of V. incurvata were germinated in vitro, and plants were acclimatized and translocated to each of two microhabitats (gallery forest and forest interior) of an Atlantic Forest fragment in South Brazil that harbors few individuals of the species. The 152 plants (76 per microhabitat) were monitored for survival and development, and abiotic data were recorded. There was increased development of morphometric parameters of the plants in the gallery forest, and survival rate ensured an 800% increase in the original population of V. incurvata in the study area. Plant survival and development parameters were positively related to light and relative air humidity. In gallery forest, plants flowered and set fruit, indicating their relationship with pollinators, since V. incurvata provides food for fauna. Further, the establishment of the individuals increased the availability of water in the canopy by accumulation in the rosettes, as well as the complexity of the canopy structure, providing a site for the occurrence of detritivorous, predatory and herbivorous arthropods. Thus, based on the method applied to V. incurvata, inserting epiphytic species into forest environments can be an efficient tool for artificial habitat regeneration, incrementing functional diversity and improving environmental quality.A micropropaga√ß√£o associada √† transloca√ß√£o de brom√©lias epif√≠ticas pode atuar como importante ferramenta para iniciativas de conserva√ß√£o, restaura√ß√£o e mitiga√ß√£o. Vriesea incurvata √© uma brom√©lia epif√≠tica formadora de tanque, end√™mica √† Floresta Atl√Ęntica, sendo uma esp√©cie importante em ambientes de floresta de galeria. Sementes de V. incurvata foram germinadas in vitro e plantas foram aclimatizadas e translocadas para dois micro-h√°bitats (floresta de galeria e interior florestal) de um fragmento de Floresta Atl√Ęntica no Sul do Brasil que abriga poucos indiv√≠duos da esp√©cie. As 152 plantas (76 por micro-h√°bitat) foram monitoradas para sobreviv√™ncia e desenvolvimento, e dados abi√≥ticos foram registrados. Houve maior desenvolvimento dos par√Ęmetros morfom√©tricos das plantas na floresta de galeria, e a taxa de sobreviv√™ncia assegurou 800% de aumento da popula√ß√£o original de V. incurvata na √°rea de estudo. A sobreviv√™ncia e os par√Ęmetros de desenvolvimento das plantas relacionaram-se positivamente com luz e umidade relativa do ar. Na floresta de galeria, as plantas floresceram e produziram frutos, indicando sua rela√ß√£o com polinizadores, uma vez que V. incurvata prov√™ alimento para a fauna. Al√©m disso, o estabelecimento de indiv√≠duos aumentou a disponibilidade de √°gua na copa por meio do ac√ļmulo nas rosetas e a complexidade da estrutura da copa, fornecendo um s√≠tio para a ocorr√™ncia de artr√≥podes detrit√≠voros, predadores e herb√≠voros. Assim, com base no m√©todo aplicado em V. incurvata, inserir esp√©cies epif√≠ticas em ambientes florestais pode ser uma eficiente ferramenta para a regenera√ß√£o artificial de h√°bitats, incrementando a diversidade funcional e melhorando a qualidade ambiental

    Checklist of the dipterofauna (Insecta) from Roraima, Brazil, with special reference to the Brazilian Ecological Station of Marac√°

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    Roraima is a Brazilian state located in the northern portion of the Amazon basin, with few studies regarding its biodiversity. The Ecological Station of Marac√° (Brazil, state of Roraima) harbors the third largest Brazilian pluvial island and is composed of a transitional landscape of savanna and Amazon rainforest components. Despite its ecological importance and strategic localization, few studies covered the dipterofauna of this locality. An updated checklist addressing 41 families of true flies (Diptera) occurring in Roraima is presented based on the literature and the specimens collected during a field expedition that occurred in 2015. This checklist brings several improvements such as new records of 165 taxa to the state of Roraima, 29 taxa to Brazil, and 259 morphotypes, mostly likely representing undescribed species

    Far away, so close! Integrative taxonomy reveals a new genus and species of land flatworm (Platyhelminthes: Geoplanidae) from southern South America

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    Land flatworms usually show low ability to disperse and high endemicity, displaying many singletons in studies on land planarian assemblages. Thus, many species have been described based on specimens sampled in a single locality and/or on a few specimens. Based on phylogenetic analyses of concatenated COI and 18S rRNA genes and morphological analyses, a new genus and species of geoplaninid land planarian is described from central‚Äď east Argentina and southern Brazil. Winsoria gen. nov. shows, among its most outstanding features, a ventral cephalic retractor muscle and a subneural muscle layer that extends throughout the anterior region of the body. In addition, characters of the reproductive system and the phylogenetic analyses support the erection of this new genus. According to molecular phylogenies, Winsoria bipatria sp. nov. is closely related to species of Luteostriata, Supramontana and Issoca, taxa that also possess a cephalic retractor muscle. Despite its disjunct distribution, phylogenetic analyses, genetic divergence and morphological features show that the allopatric populations studied herein belong to a single species. We argue that the occurrence of W. bipatria in localities separated by hundreds of kilometres and a geographical barrier should be explained by passive dispersal.Fil: Negrete, Lisandro Hector Luis. Consejo Nacional de Investigaciones Cient√≠ficas y T√©cnicas. Centro Cient√≠fico Tecnol√≥gico Conicet - La Plata; Argentina. Universidad Nacional de La Plata. Facultad de Ciencias Naturales y Museo. Divisi√≥n Zoolog√≠a Invertebrados; ArgentinaFil: Vargas do Amaral, Silvana. Universidad de Vale do Rio dos Sinos; BrasilFil: Gamino Ribeiro, Giovana. Universidad de Vale do Rio dos Sinos; BrasilFil: Wolmann Gon√ßalves, Juliana. Universidad de Vale do Rio dos Sinos; BrasilFil: Valiati, Victor Hugo. Universidad de Vale do Rio dos Sinos; BrasilFil: Damborenea, Maria Cristina. Consejo Nacional de Investigaciones Cient√≠ficas y T√©cnicas. Centro Cient√≠fico Tecnol√≥gico Conicet - La Plata; Argentina. Universidad Nacional de La Plata. Facultad de Ciencias Naturales y Museo. Divisi√≥n Zoolog√≠a Invertebrados; ArgentinaFil: Brusa, Francisco. Consejo Nacional de Investigaciones Cient√≠ficas y T√©cnicas. Centro Cient√≠fico Tecnol√≥gico Conicet - La Plata; Argentina. Universidad Nacional de La Plata. Facultad de Ciencias Naturales y Museo. Divisi√≥n Zoolog√≠a Invertebrados; ArgentinaFil: Leal Zanchet, Ana Mar√≠a. Universidad de Vale do Rio dos Sinos; Brasi

    Land Flatworms (Platyhelminthes: Tricladida) in Remnants of Deciduous Forest in the Northeast Region Of Southern Brazil

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    Land flatworms show high endemism due to their restricted mobility. In southern Brazil, land flatworm communities have been found mainly in areas of ombrophilous forests. Thus, this study documents land planarian species composition in remnants of deciduous seasonal forest in the northeast region of southern Brazil. Direct, diurnal samplings reveal the occurrence of 26 species of land flatworms, of which one belongs to the subfamily Rhynchodeminae and the others to the subfamily Geoplaninae. The Rhynchodeminae genus Rhynchodemus Leidy 1851 and the following Geoplaninae genera occurred: CephaloflexaCarbayo & Leal-Zanchet, 2003, Choeradoplana Graff, 1896, Imbira Carbayo et al., 2013, IssocaFroehlich, 1955, LuteostriataCarbayo, 2010, Obama Carbayo et al., 2013, Paraba Carbayo et al., 2013, Pasipha Ogren & Kawakatsu, 1990 and XerapoaFroehlich, 1955, besides the collective group Pseudogeoplana Ogren & Kawakatsu, 1990. The genus Obama had the highest species richness (S=6), followed by Paraba (S=4) and Pasipha (S=3). Eighteen species were recorded exclusively in one of the two study areas, and eight species occurred in both sites. The known distribution of Luteostriata abundans (Graff, 1899), Choeradoplana iheringiGraff, 1899, Obama ficki (Amaral & Leal-Zanchet, 2012), Imbira guaiana (Leal-Zanchet & Carbayo, 2001) and Pasipha hauseri (Froehlich, 1959) is increased. Results emphasize the relevance of expanding taxonomic studies on land flatworms and including more study areas in southern Brazil

    Platyhelminthes ou apenas semelhantes a Platyhelminthes? Rela√ß√Ķes filogen√©ticas dos principais grupos de turbel√°rios

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    The phylum Platyhelminthes has been traditionally subdivided into four classes, viz. Turbellaria, Trematoda, Monogenea e Cestoda. However, phylogenetic analyses indicated that the class Turbellaria was not well defined due to the lack of clear synapomorphies. Those studies were initially performed on the basis of morphological data. They indicated that the phylum Platyhelminthes encompasses three monophyletic groups: Acoelomorpha, Catenulida and Rhabditophora. Molecular analyses, as well as studies combining morphological and molecular data, have indicated that the acoelomorphs are not members of the Platyhelminthes. This article is intended to discuss the phylogenetic relationships of the main groups comprising the turbellarians based on morphological and molecular characters, as well as the position of acoelomorphs in relation to other invertebrates.Key words: acoels, catenulids, rhabditophorans, phylogeny, invertebrates.Tradicionalmente, o filo Platyhelminthes era subdividido em quatro classes, Turbellaria, Trematoda, Monogenea e Cestoda, mas estudos filogen√©ticos apontaram que a classe Turbellaria n√£o estava bem definida devido √† aus√™ncia de sinapomorfias claras. Tais estudos, inicialmente realizados considerando dados morfol√≥gicos, indicaram que o filo Platyhelminthes apresenta-se constitu√≠do por tr√™s grupos monofil√©ticos: Acoelomorpha, Catenulida e Rhabditophora. An√°lises moleculares, bem como estudos combinando dados morfol√≥gicos e moleculares, t√™m indicado que os acelomorfos n√£o s√£o integrantes do filo Platyhelminthes. O presente artigo de revis√£o tem como objetivo discutir as rela√ß√Ķes filogen√©ticas dos principais grupos que integram os turbel√°rios, com base em caracteres morfol√≥gicos e moleculares, bem como a posi√ß√£o dos acelomorfos em rela√ß√£o aos demais invertebrados.Palavras-chave: acelos, catenulidos, rabdit√≥foros, filogenia, invertebrados
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