Tag Archives: distribution

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”.

Schermafbeelding 2019-04-18 om 08.25.56

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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New record for Gulella bicolor in Mexico

A specimen of Huttonella bicolor = Gulella bicolor (Hutton, 1834) was collected from clayey-sandy soil in Tabasco, Mexico, which constitutes its second record in the state and the third in Mexico. This small gastropod is a predator that has mainly spread through tropical and island regions as an exotic species. Its introduction to Asian and Caribbean Islands is noteworthy. Its pupiform shell and the lamella or tooth complex were compared against previous descriptions. In Mexico, this species has been found in northern Veracruz and Tabasco, which confirms that it is spreading along the Gulf of Mexico from the United States towards Brazil. The features of this streptaxid as a potential hazard through its preferred prey are discussed”.

Schermafbeelding 2019-04-08 om 13.47.07

An additional record to the ones given in the paper is the recent mentioning of this species for Belize by Dourson et al. (2018: 315).

Introduced species are often problematic with regard to the native malacofauna, but in this case the authors argue that also additional reasons may be present for keeping a close eye on the further spread of this species. Which is related to exotic species always a good idea to follow and document their distribution.

Reference:
Costillo-Rodriguez, Z.G. et al., 2018. A new record of Huttonella bicolor (Hutton, 1834) (Mollusca, Gastropoda, Streptaxidae) in Mexico. – Acta Zoológica Mexicana (n.s.) 34: e3411181 (6 pp.).

More on Argentinian Bostryx

María José Miranda has recently published a new study on several Bostryx species from central western Argentina. As always, this is a thorough paper with lots of anatomical data.

Miranda15

The abstract reads: “The genus Bostryx Troschel, 1847 is endemic to South America, extending from Ecuador to Chile and Argentina. The southernmost Argentinian species of the genus that inhabit San Luis, San Juan and Mendoza provinces, specially the pre-Andes, Andes and Sierras Pampeanas mountain ranges, were examined. This is the first time the anatomy of Bostryx pastorei (Holmberg, 1912), Bostryx reedi (Parodiz, 1947) and Bostryx strobeli (Parodiz, 1956) has been described. Bostryx cordillerae (Strobel, 1874) is re-described regarding shell and anatomy due to new morphological data. The main differences among the species examined are based on shell characters. The distribution of Bostryx mendozanus (Strobel, 1874) and Bostryx cuyanus (Pfeiffer, 1867), other species found in this region, was also discussed”.

As she cited my publication about the subfamily Bostrycinae (Breure, 2012), I feel entitled to correct a possible misinterpretation. From her text it gives the impression that I have a very restricted view of this subfamily, leaving out all species not listed in my 2012 paper. The contrary is true. Page 3 of my paper explicitly stated that the list presented is incomplete, and further research should show which other species belong to this monophyletic clade. As the shell shape may be very misleading, which is corroborated in Miranda’s paper, I invited further research using anatomical and molecular data. Miranda’s paper is a welcome contribution to this end, although she has not presented phylogenetic data which could supplement the available data in GenBank. Hence there is room for further additions…

References:
Breure, A.S.H., 2012. The status of the genus Bostryx Troschel, 1847, with description of a new subfamily (Mollusca, Gastropoda, Bulimulidae). – ZooKeys 216: 1-3.
Miranda, M.J., 2015. The genus Bosoryx in central western Argentina: anatomical and distributional description of four of its southernmost species (Gastropoda, Bulimulidae). – Iheringia, Zoologia 105: 484–498.

Epiphragmophora distribution

Geographical distributions of snails sometimes remain a bit puzzling, and Cuezzo (2015) has delivered another case where both a geographic gap and an altitudinal gap seem to exist.

“This is the first record of Epiphragmophora estella in Argentina, a species traditionally of Bolivian distribution. Specimens were found during several field trips conducted in the northern patch of the Southern Andean Yungas forest of Salta province. Morphometrics and qualitative shell characters are described in order to validate the taxonomic identification. Current species distribution is also reported”.

Cuezzo 2015 f2

This disjunct distribution calls for additional field work in Bolivia, a country which malacofauna remains poorly known.

Reference
Cuezzo, M.G., 2015.  First record of occurrence of Epiphragmophora estella (d’Orbigny, 1837) (Mollusca, Gastropoda, Stylommatophora) in Argentina. – Check List 11: 1496. Available at http://biotaxa.org/cl/article/view/11.1.1496/10873

Various new papers

Several new papers on Neotropical snails did appear recently, with emphasis on Cuba and Brazil (decidedly the most active malacological societies).

Cuban papers were published in a new issue of the journal ‘Solenodon’ and focus mainly on Cerionidae.

Suárez studied the reproductive cycle of Cerion mumia chrysalis Férrusac, 1837. “Gonads of 144 mature specimens of Cerion mumia chrysalis were examined. Between January-December, 2012 were collected 12 specimens per month. Two reproductive cycles were recognized, one from January to April, and another from July to September. Both male and female reproductive cells were observed inside the acini, which defines the species as hermaphrodite. During May-June and subsequently in October-November no follicular activity was observed. In December, the acini decreased notably in size”.

Suarez 2015

Suárez et al. published on the effect of hurricanes on molluscs. “Data about the conservation status on mollusk populations of Cerion dimidiatum Pfeiffer, C. scalarinum Pfeiffer and Gundlach, C. torrei moralesi Clench and Aguayo, C. p. paucicostatum Torre, and C. orientale Clench and Aguayo, local endemics from Eastern Cuba are given. Populations were affected by the hurricanes hazard, been obtained values of 0.4 ind/m2; 0. 37 ind/m2; 0.04 ind/m2; 0.16 ind/m2 and 0.03 ind/m2 respectively”.

Two papers related to distribution. Fernández et al. (2015a) published on “the geographic distribution range of Cerion saetiae Sánchez Roig, 1948 was widened, with two new records: Playita de Fidel in Saetía key and Baracutey beach from El Ramón de Antilla peninsula. It presence was corroborated at type locality. Abundance and lineal dimensions variability of shell are explained”.

Fernandez et al 2015a

Fernández et al. (2015b) made “a study about terrestrial mollusks in altitudinal levels and different rocky substrata in Sierra de Nipe. Thirty new records from Sierra of Nipe and adjacent heights are presented. Twenty-six localities were visited; among them seven on serpentine rocks between 400-1000 masl, 19 localities on calcareous substratum from 100- 400 masl and eight localities were taking from published papers. One hundred fourteen species were recorded, constituting 8.2% of the Cuban fauna thereby reaching the second more diverse place in Cuba, after Viñales; therefore representing 57.3% of those known species at Nipe-Sagua-Baracoa. On calcareous substratum 113 species were recorded while on serpentine were 25, most of them also on calcareous soils, except Caracolus n. sp. Part of this terrestrial mollusks “hotspot” is protected by the National Park Mensura-Piloto”.

Fernandez et al 2015b

Finally, I like to mention a recent paper by Simone on the bulimulid genus Kora, with description of new species. The abstract reads “Three new species of the recently described genus Kora are described, based on dry material collected in caverniculous and adjacent environments. Kora terrea, from Presidente Olegdrio, MG, is characterized by spotted pigmentation; projected, wide outer lip, and pointed spire. Kora nigra, from Carinhanha, BA, is characterized by dark-brown color, elliptical outline, and rounded, narrow aperture. Kora iracema, from Sao Desidério, BA, is characterized by very ample, projected outer lip, wide spire and white coloration. A new occurrence of the type species, Kora corallina, is reported, from Carinhanha, BA, expanding its geographic distribution ~200km towards southwest. Species of the genus Kora have been shown to be restricted to semi-dry, caatinga environment, restricted to south region of Northeast Brazilian region, and north of Southeast region”.

Simone 2015

References:
Fernández, A., Franke, S., Suárez, A. & Hernández, I., 2015a. Registros nuevos, abundancia y morfometría de Cerion saetiae (Mollusca: Pulmonata) en la provincia Holguín, Cuba. – Solenodon 12: 28-32.
Fernández, A., Frenke, S., Espinosa, J., Reyes, E., Sigaretta, S., Matos, A. & Rodríguez, Y., 2015b. Moluscos terrestres (Mollusca: Gastropoda) en Sierra de Nipe y alturas adyacentes, Cuba. – Solenodon 12: 38-56.
Simone, L.R.L., 2015. Three new species of Kora (Pulmonata, Orthalicidae) from Bahia and Minas Gerais, Brazil. – Journal of Conchology 42: 51-56.
Suárez, A., 2015. Ciclo reproductivo de Cerion mumia chrysalis (Pulmonata: Stylommatophora: Cerionidae). – Solenodon 12: 21-27.
Suárez, A., Hernández, I., Morales, A. & Fernández, A., 2015. Densidad de algunas poblaciones de ceriónidos (Mollusca: Gastropoda: Cerionidae) de la región oriental de Cuba, recientemente afectada por huracanes. – Solenodon 12: 33-37.

[The Solenodon issue is available here]