Freshwater micro-gastropods from the Iguaçu National Park, Brazil: two new truncatelloid caenogastropods and anatomy of Chilina megastoma Hylton Scott, 1958 (Gastropoda: Hygrophila: Chilinidae)
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Museu de Zoologia da Universidade de São Paulo, Brazil
Luiz Ricardo L. Simone   

Museu de Zoologia da Universidade de São Paulo, Cx. Postal 42494, 04218-970, São Paulo, SP, Brazil
Submission date: 2020-08-07
Final revision date: 2021-01-15
Acceptance date: 2021-02-01
Online publication date: 2021-03-05
Publication date: 2021-03-25
Folia Malacol. 2021;29(1):13–32
Collecting in Foz do Iguaçu National Park, Paraná, Brazil, an important tourist region with preserved rainforest, has revealed three micro-gastropod species which required morphological and taxonomic studies. One of them is a chilinid Chilina megastoma Hylton Scott, a member of a poorly studied group. Another two are new species of truncatelloid caenogastropods: Potamolithus mirim n. sp. and Heleobia iguassu n. sp. The three species are described in detail and discussed from taxonomic and phylogenetic point of view. As they are highly endemic, protective measures are suggested.
Bichuette M. E., Trajano E. 2018. Diversity of Potamolithus (Littorinimorpha, Truncatelloidea) in a high-diversity spot for troglobites in southeastern Brazil: role of habitat fragmentation in the origin of subterranean fauna, and conservation status. Subterranean Biology 25: 61–88.
Bouchet P., Rocroi J. P. 2005. Classification and nomenclator of gastropod families. Malacologia 47: 1–397.
Brace E. C. 1983. Observations on the morphology and behaviour of Chilina fluctuosa Gray (Chilinidae), with a discussion on the early evolution of pulmonate gastropods. Philosophical Transactions of the Royal Society of London B 300: 463–491.
Brito M. C. W. 2014. Guia de fauna do Parque Nacional do Iguaçu. WWF, Iguaçu.
Campbell D. C., Clark S. A., Lydeard C. 2017. Phylogenetic analysis of the Lancinae (Gastropoda, Lymnaeidae) with a description of the U. S. federally endangered Banbury Springs lanx. ZooKeys 663: 107–132.
Collado G. A. 2015. A new freshwater snail (Caenogastropoda: Cochliopidae) from the Atacama Desert, northern Chile. Zootaxa 3925: 445–449.
Cuezzo M. G., Gutiérrez Gregoric D. E., Pointier J. P., Vázquez A. A., Ituarte C., Mansur M. C. D., Arruda J. O., Barker G. M., Santos S. B., Ovando X. M. C., Lacerda L. E. M., Fernandez M. A., Thiengo S. C., Mattos A. C., Silva E. F., Berning M. I., Collado G. A., Miyahira I. C., Antoniazzi T. N., Pimpão D. M., Damborenea C. 2020. Phylum Mollusca. In: Damborenea C., Rogers D. C., Thorp J. H. (eds). Thorp and Covich’s freshwater invertebrates. Keys to Neotropical and Antarctic fauna. Academic Press, Cambridge, MA, pp. 261–430.
Davis G. M., Silva M. C. P. da 1984. Potamolithus: morphology, convergence, and relationships among hydrobioid snails. Malacologia 25: 73–108.
Duncan C. J. 1960. The genital systems of the freshwater Basommatophora. Proceedings of the Zoological Society of London 135: 339–355.
Gutiérrez Gregoric D. E., Lucía M. de 2016. Freshwater gastropods diversity hotspots: three new species from the Uruguay River (South America). PeerJ 4: e2138.
Gutiérrez Gregoric D. E., Núñes V., Rumi A. 2010. Population studies of an endemic gastropod from waterfall environments. American Malacological Bulletin 28: 159–165.
Gutiérrez Gregoric D. E., Núñes V., Rumi A. 2012. Population dynamics of freshwater gastropod Chilina fluminea (Chilinidae) in a temperate climate environment in Argentina. Veliger 51: 109–116.
Gutiérrez Gregoric D. E., Rumi A. 2008. Chilina iguazuen­sis (Gastropoda: Chilinidae), new species from Iguazú National Park, Argentina. Malacologia 50: 321–330.
Haeckel W. 1911. Beitrage zur Anatomie der Gattung Chilina. Zoologische Jahrbücher, supplement 13: 89–136, pls 7–11.
Harry W. H. 1964. The anatomy of Chilina fluctuosa Gray reexamined, with prolegomena on the phylogeny of the higher limnic Basommatophora (Gastropoda: Pulmonata). Malacologia 1: 355–385.
Hershler R., Thompson F. G. 1992. A review of the aquatic gastropod subfamily Cochliopinae (Prosobrancha: Hydrobiidae). Malacological Review, supplement 5: 1–140.
Ibikounlé M., Massougbodji A., Sakiti N. G., Pointier J. P., Moné H. 2008. Anatomical characters for easy identification between Biomphalaria pfeifferi, Helisoma duryi and Indoplanorbis exustus during field surveys. Journal of Cell and Animal Biology 2: 112–117.
Ituarte C. F. 1997. Chilina megastoma Hylton Scott, 1958 (Pulmonata: Basommatophora): a study on topotypic specimens. American Malacological Bulletin 14: 9–15.
Kabat A. R., Hershler R. 1993. The prosobranch snail family Hydrobiidae (Gastropoda: Rissooidea): review of classification and supraspecific taxa. Smithsonian Contributions to Zoology 547: 1–94.
Koch E., Martin S. M., Ciocco N. F. 2015. A molecular contribution to the controversial taxonomical status of some freshwater snails (Caenogastropoda: Rissooidea, Cochliopidae) from the Central Andes desert to Patagonia. Iheringia, Série Zoologia 105: 69–75.
Marcus E., Marcus E. 1962. On Siphoraria hispida. Botelim da Faculdade de Filosofia, Ciências e Letras da Universidade de São Paulo, Zoologia 24: 107–140.
Ovando X. M. C., Gutiérrez Gregoric D. E. 2012. Systematic revision of Chilina Gray (Gastropoda: Pulmonata) from northwestern Argentina and description of a new species. Malacologia 55: 117–134.
Ovando X. M. C., Lacerda L. E. M., Santos S. B. 2020. Is Chilina megastoma, an endemic and restricted distribution freshwater snail, endangered even trough protected? Tentacle 28: 21–23.
Paraense W. L. 1981. Biomphalaria occidentalis sp. n. from South America (Mollusca Basommatophora Pulmonata). Memórias do Instituto Oswaldo Cruz 76: 199–211.
Paraense W. L. 1982. Lymnaea rupestris sp. n. from southern Brazil (Pulmonata: Lymnaeidae). Memórias do Instituto Oswaldo Cruz 77: 437–443.
Paraense W. L. 1984. Lymnaea diaphana: a study of topotypic specimens (Pulmonata: Lymnaeidae). Memórias do Instituto Oswaldo Cruz 79: 75–81.
Paraense W. L. 1986. Physa marmorata Guilding, 1828 (Pulmonata: Physidae). Memórias do Instituto Oswaldo Cruz 81: 459–469.
Paraense W. L. 1987. Physa cubensis Pfeiffer, 1839 (Pulmonata: Physidae). Memórias do Instituto Oswaldo Cruz 82: 15–20.
Paraense W. L. 1988. Biomphalaria kuhniana (Clessin, 1883), planorbid mollusc from Douth America. Memórias do Instituto Oswaldo Cruz 83: 1–12.
Paraense W. L. 1995. Lymnaea cousini Jousseaune, 1887, from Ecuador (Pulmonata: Lymnaeidae). Memórias do Instituto Oswaldo Cruz 90: 605–609.
Paraense W. L. 1996. Neotropical planorbid snails with apertural lamellae. I. Biomphalaria helophila (Orbigny, 1835). Memórias do Instituto Oswaldo Cruz 91: 177–186.
Paraense W. L. 2002. Plesiophysa dolichomastix sp. n. (Gastropoda: Planorbidae). Memórias do Instituto Oswaldo Cruz 97: 505–508.
Paraense W. L. 2003. Planorbidae, Lymnaeidae and Physidae of Peru (Mollusca: Basommatophora). Memórias do Instituto Oswaldo Cruz 98: 767–771.
Paraense W. L., Deslandes N. 1955a. Observations on the morphology of Australorbis nigricans. Memórias do Instituto Oswaldo Cruz 53: 121–134.
Paraense W. L., Deslandes N. 1955b. Observations on the morphology of Australorbis glabratus. Memórias do Instituto Oswaldo Cruz 53: 87–103.
Paraense W. L., Pontier J. P. 2003. Physa acuta Draparnaud, 1805 (Gastropoda: Physidae): a study of topotypic specimens. Memórias do Instituto Oswaldo Cruz 98: 513–517.
Ponder W. F. 1988. The truncatelloidean (= rissoacean) radiation: a preliminary phylogeny. Malacological Review, supplement 4: 129–166.
Salamuni R., Salamuni E., Rocha L. A., Rocha A. L. 2001. Parque Nacional do Iguaçu, PR. Cataratas de fama mundial. In: Schobbenhaus C., Campos D. A., Queiroz E. T., Winge M., Berbert-Born M. L. C. (eds). Sítios geolóricos e paleontológicos do Brasil. DNPM. Rio de Janeiro 11: 313–321.
Scott M. I. H. 1958. Nueva especie de Chilina del norte Argentino. Neotropica 4: 26–27.
Sideman W. A. Jr, Rodrick G. E., Paraense W. L., Vargas G. M. 1985. Biomphalaria straminea and other planorbids in the Dominican Republic. Memórias do Instituto Oswaldo Cruz 80: 453–456.
Silva M. C. P. da 2003. Hydrobiidae (Gastropoda, Neo­taenioglossa, Rissooidea) da planície costeira do Rio Grande do Sul, Brasil. PhD Thesis Universidade Federal do Rio Grande do Sul. Porto Alegre, 382 pp.
Silva M. C. P. da, Veitenheimer-Mendes I. L. 2004. Nova espécie de Heleobia (Rissooidea, Hydrobiidae) da planície costeira do sul do Brasil. Iheringia, Série Zoologia 94: 89–94.
Simone L. R. L. 2006a. Land and freshwater mollusks of Brazil. EGB Fapesp., São Paulo.
Simone L. R. L. 2006b. Accounts on the phylogeny of the Rissooidea (=Hydrobioidea) and Littorinoidea, based on some American representatives, as base for a future taxonomic revaluation (Mollusca, Caenogastropoda). Strombus 13: 18–26.
Simone L. R. L. 2011. Phylogeny of the Caenogastropoda (Mollusca), based on comparative morphology. Arquivos de Zoologia 42: 161–323.
Simone L. R. L., Bunioto T. C., Avelar W. E. P., Hayashi C. 2012. Morphology and biological aspects of Gundlachia ticada from S. E. Brazil. Archiv für Molluskenkunde 141: 21–30.
Simone L. R. L., Moracchioli N. 1994. Hydrobiidae (Gastropoda: Hydrobioidea) from the Ribeira Valley, S. E. Brazil, with descriptions of two new cavernicolous species. Journal of Molluscan Studies 60: 445–459.
Simone L. R. L., Seabra M. I. G. L. 2017. Shell and body structure of the plesiomorphic pulmonae marine limpet Siphonaria pectinata (Linnaeus, 1758) from Portugal (Gastropoda: Heterobranchia: Siphonariidae). Folia Malacologica 25: 147–164.
Taylor D. W. 2003. Introduction to Physidae (Gastropoda: Hygrophila); biogeography, classification, morphology. Revista de Biologia Tropical 51, supplement 1: 1–287.
Vaz J. F. 1979. Apontamentos sobre a anatomia macroscópica do sistema nervoso de Aplexa marmorata (Guilding, 1828) – (Basommatophora – Physidae). Anais do V Encontro dos Malacologistas Brasileiros. Publicações Avulsas da Fundação Zoobotânica 4: 55–67.
WoRMS. 2020. Chilinoidea Dall, 1870. World Register of Marine Species, Editorial Board. Available online at (accessed 1 April 2020).