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      A new genus and species of cavernicolous Pomatiopsidae (Mollusca, Caenogastropoda) in Bahia, Brazil

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          Abstract

          Spiripockia punctatais a new genus and species of Pomatiopsidae found in a cave from Serra Ramalho, SW Bahia, Brazil. The taxon is troglobiont (restricted to subterranean realm), and is characterized by the shell weakly elongated, fragile, translucent, normally sculptured by pustules with periostracum hair on tip of pustules; peristome highly expanded; umbilicus opened; radular rachidian with 6 apical and 3 pairs of lateral cusps; osphradium short, arched; gill filaments with rounded tip; prostate flattened, with vas deferens inserting subterminally; penis duct narrow and weakly sinuous; pallial oviduct simple anteriorly, possessing convoluted bypass connecting base of bulged portion of transition between visceral and pallial oviducts with base of seminal receptacle; spermathecal duct complete, originated from albumen gland. The description of this endemic species may raise protective environmental actions to that cave and to the Serra Ramalho Karst area.

          Translated abstract

          Spiripockia punctata é gênero e espécie novos de Pomatiopsidae encontrado em uma caverna da Serra Ramalho, SW Bahia, Brasil. O táxon é troglóbio (restrito à vida subterrânea), caracterizado pela concha levemente alongada, frágil, translúcida, normalmente esculturada por pústulas contendo pelos do perióstraco no topo das pústulas; perístoma altamente expandido; umbílico aberto; dente raquidiano da rádula com 6 cúspides apicais e 3 pares de basais; osfrádio curto e curvo; filamentos branquiais com topo arredondado; próstata achatada, com vaso deferente inserindo subterminalmente; ducto do pênis fracamente sinuoso; oviduto palial anteriormente simples, possuindo um by-pass convoluto da base da porção bulbosa da porção entre oviduto visceral e palial com a base do receptáculo seminal; ducto da espermateca completo, originado da glândula de albume. A descrição dessa espécie endêmica deve contribuir com ações protetivas do ambiente da caverna e à área da Serra Ramalho.

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          Most cited references12

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          Land and freshwater molluscs of Brazil.

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            Terrestrial invasion of pomatiopsid gastropods in the heavy-snow region of the Japanese Archipelago

            Background Gastropod mollusks are one of the most successful animals that have diversified in the fully terrestrial habitat. They have evolved terrestrial taxa in more than nine lineages, most of which originated during the Paleozoic or Mesozoic. The rissooidean gastropod family Pomatiopsidae is one of the few groups that have evolved fully terrestrial taxa during the late Cenozoic. The pomatiopsine diversity is particularly high in the Japanese Archipelago and the terrestrial taxa occur only in this region. In this study, we conducted thorough samplings of Japanese pomatiopsid species and performed molecular phylogenetic analyses to explore the patterns of diversification and terrestrial invasion. Results Molecular phylogenetic analyses revealed that Japanese Pomatiopsinae derived from multiple colonization of the Eurasian Continent and that subsequent habitat shifts from aquatic to terrestrial life occurred at least twice within two Japanese endemic lineages. Each lineage comprises amphibious and terrestrial species, both of which are confined to the mountains in heavy-snow regions facing the Japan Sea. The estimated divergence time suggested that diversification of these terrestrial lineages started in the Late Miocene, when active orogenesis of the Japanese landmass and establishment of snowy conditions began. Conclusions The terrestrial invasion of Japanese Pomatiopsinae occurred at least twice beside the mountain streamlets of heavy-snow regions, which is considered the first case of this event in the area. Because snow coverage maintains stable temperatures and high humidity on the ground surface, heavy-snow conditions may have paved the way for these organisms from freshwater to land via mountain streamlets by preventing winter desiccation in mountain valleys. The fact that the terrestrialization of Pomatiopsidae occurred only in year-round wet environments, but not in seasonally dried regions, provides new insight into ancient molluscan terrestrialization.
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              The origin and evolution of the gastropod family Pomatiopsidae with emphasis on the Mekong River Triculinae

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                Author and article information

                Journal
                paz
                Papéis Avulsos de Zoologia
                Pap. Avulsos Zool.
                Museu de Zoologia da Universidade de São Paulo (São Paulo, SP, Brazil )
                0031-1049
                1807-0205
                2012
                : 52
                : 40
                : 515-524
                Affiliations
                [01] São Paulo SP orgnameUniversidade de São Paulo orgdiv1Museu de Zoologia Brasil lrsimone@ 123456usp.br
                Article
                S0031-10492012022000001 S0031-1049(12)05204001
                10.1590/S0031-10492012022000001
                8e6fc137-f1a0-4ef7-9e7a-8cf3e5ef8da4

                This work is licensed under a Creative Commons Attribution 4.0 International License.

                History
                : 26 October 2012
                : 20 December 2012
                Page count
                Figures: 0, Tables: 0, Equations: 0, References: 12, Pages: 10
                Product

                SciELO Brazil


                Anatomy,Pomatiopsidae,Spiripockia punctata gen. nov. et sp. nov.,Brasil,Caverna,Troglóbio,Anatomia,Brazil,Cave,Troglobiont

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