Tag Archives: brazil

New records for Brazilian Helicina

A new paper just appeared by Silva et al. “New records for Helicina schereri Baker, 1913, are reported. It was a species previously restricted to the states of Ceará, Rio Grande do Norte, Paraíba, Alagoas and Tocantins in Northeastern Brazil, and State of Santa Catarina, much further south. The new occurrences reported herein fill distribution gaps and also significantly expand the range of the species ca. 970 km westwards. The new records are from the following locations: Bahia State (Ituaçu and Itaquara municipalities) in Northeast Brazil; Mato Grosso do Sul State (Bonito Municipality) in the Midwest; and Minas Gerais (Lagoa Santa municipality) in the Southeast”.

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Reference:
Silva, F. dos Santos et al., 2019. New records of Helicina schereri (Gastropoda: Helicinidae) from the states of Bahia, Minas Gerais, and Mato Grosso do Sul, Brazil. – Papéis Avulsos de Zoologia, 59: e20195903 (3 pp.).

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Megalobulimus in Brazil

A short paper by Fontanelle et al. just appeared on one of the Brazilian species of this genus. “The taxonomical status of Megalobulimus toriii Morretes, 1937 from southeastern Brazil is reassessed herein. A large series of shells of M. toriii and M. yporanganus (Ihering & Pilsbry, 1901) were analysed for conchological features and measured for a principal component analysis. The material included recent shells and sub-fossil specimens (no living specimens or ethanol-preserved specimens could be procured). Megalobulimus toriii falls within the spectrum of morphological variation of M. yporanganus and is thus considered its synonym. Megalobulimus yporanganus was originally described from the Ribeira Valley in São Paulo state and its present distribution includes only other localities in this valley. However, the species is also known from Holocene archaeological contexts (shell mounds) and karst outcrops, with the oldest records dating from circa 10,800–9,200 YBP. Its past distribution extended southwards to the coast of Santa Catarina state”.

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Reference:
Fontanelle, J.H. et al., 2019. Taxonomic reassessment of Megalobulimus toriii (Gastropoda, Strophocheilidae). – Journal of Conchology, 43 (3): 313-320.

Snails as snake prey

Several snake species are known to prey on molluscs, and in the Neotropics some examples are already known; e.g., in the recent book on Belizan land snails by Dourson et al. pictures are given of Sibon species consuming a Drymaeus.

By serendipity I found a paper by Sazima & Muscat (2016) on Dipsas snakes in Brazil, which are known to feed on snails and slugs. The first author had reported in the past about the challenges that these molluscs offer to their predator. Snails must be removed from their shell and slugs release plenty of mucus, making snail handling time-consuming and handling slugs poses the risk of sticking to the substratum. Most observations are based on laboratory conditions, but this paper describes how newly hatched snakes are feeding on snails under natural conditions.

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The (unwilling) victims in these cases were respectively Bulimulus tenuissimus (d’Orbigny, 1835) and Helicina angulata G.B. Sowerby, 1873. Both observations were made in Sao Paulo state in different forests.

Reference:
Sazima, I. & Muscat, E., 2016. Shelled baby food: Newly hatched goo‐eating snakes of the genus Dipsas (Squamata: Dipsadidae) prey on snails in nature. – Herpetologia Brasileira, 5 (3): 63-64. 

New Tryonia from Brazil

Almeida Guimaraes et al. have studied a sample of fossil freshwater gastropods from northwestern Brazil. Their abstract “This paper deals with the record of gastropods of the family Cochliopidae, genus Tryonia, from the Mio-Pliocene Solimões Formation, from the borehole 1AS-34-AM drilled in the upper Jutaí River, Amazonas State, Brazil. We report four species, including Tryonia scalarioides scalarioides, Tryonia cf. T. nuttalli, besides of a new species and other kept in open nomenclature”.

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The new species described is Tryonia globosa and the holotype is in the Paleontological Section of the Museu Paraense Emílio Goeldi (MPEG 2357-I/1).

Reference:
de Almeida Guimaraes, L.I. et al., 2018. New records of Tryonia (Gastropoda, Cochliopidae) from the Mio-Pliocene Solimoes Formation (State of Amazonas), Brazil. – Revista Brasileira de Paleontologia, 21 (3):255-264

New Diplommatinids from Brazil

Luiz Simone just described new Diplommatinid taxa from Brazil. There is no abstract, but the introduction mentions “The present paper describes new species found in caves from Bonito, Mato Grosso do Sul, Mid-West Brazilian region. The material is comprised of minute, dry shells, in which analysis shows the necessity of describing two new species and a new genus, suggestively attributed to the terrestrial caenogastropod family Diplommatinidae”.

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It is interesting that these snails were discovered in caves, which are generally known to often have a peculiar fauna. Undoubtedly we will have more new taxa when other caves in Brazil are being explored.

Reference:
Simone, L.R.L., 2019. The new genus Habeastrum, with two new species (Gastropoda, Diplommatinidae) in Mato Grosso do Sul caves, Brazil. – Zootaxa, 4543: 287-290.

Brazilian Helicina

Freshly pressed: a paper by Silva et al. on Brazilian Helicina. Their abstract reads as follows “New records for Helicina schereri Baker, 1913, are reported. It was a species previously restricted to the states of Ceará, Rio Grande do Norte, Paraíba, Alagoas and Tocantins in Northeastern Brazil, and State of Santa Catarina, much further south. The new occurrences reported herein fill distribution gaps and also significantly expand the range of the species ca. 970 km westwards. The new records are from the following locations: Bahia State (Ituaçu and Itaquara municipalities) in Northeast Brazil; Mato Grosso do Sul State (Bonito Municipality) in the Midwest; and Minas Gerais (Lagoa Santa municipality) in the Southeast”.

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Reference:
Silva, F.S. et al., 2019. New records of Helicina schereri (Gastropoda: Helicinidae) from the states of Bahia, Minas Gerais, and Mato Grosso do Sul, Brazil. – Papéis Avulsos de Zoologia, 59: e20195903 (4 pp.).

Contributions of Morretes

Recently a paper was published on the contributions of a Brazilian malacologist, Federico Lange de Morretes (Gernet et al., 2018). The text is in Portuguese, but there is also an abstract in English: “Frederico Lange de Morretes was born on May 5, 1892, in the municipality of Morretes, Paraná, Brazil. A renowned plastic artist, he was also an important malacologist, and his scientific production in the area made him a reference for Brazilian researchers. The main objective of this paper is to make a commented compilation of the malacological studies produced by him. He published 13 scientific papers in the area of malacology, eight of them related to the description of 25 new species, two new genera and three subgenera. He also wrote three institutional technical reports on activities carried out at the Museu Paulista and at the Museu Paranaense”. He died in 1954.

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The paper contains illustrations of the type material of the newly described taxa by Morretes, one figure of which is copied above. The authors made me aware there are two persons with similar names, Frederico Godefredo Lange de Morretes and Frederico Waldemar Lange. The first was a malacologist, the latter a palaeontologist; both worked in Museu Paranaense in the 1950s. Only the latter is mentioned in ‘2400 years of malacology’ (ed. 2018) but apparently with the wrong years of birth and death, which was the source of confusion for these two semi-homonyms.

Reference:
Gernet, M., et al., 2018. A contribuição de Frederico Lange de Morretes para a malacologia brasileira. – Arquivos de Zoología, 49 (3): 153-165.