Tag Archives: bostryx

Photo of the day (177): Bostryx

These photos have been taken at Tambo de Viso in the Rio Rimac valley of Peru. They show Bostryx multiconspectus Breure, 2008, one of the carinated species that occurs in Andean countries. As this phenomenon, despite some examples from other parts of the world, is still poorly understood, we have conducted fieldwork several years ago. For various reasons the completion of a manuscript about this work has been delayed, but is foreseen for the near future.

Photos by courtesy of Philipp Meinecke and Nora Richter-Harder.

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Photo of the day (176): Bostryx

These photos are part of a series taken at El Infernillo, Rio Rimac valley near Lima. They all depict Bostryx solutus Troschel, 1847, which shows some morphological variation at this locality. This variation is still poorly understood and may be due to ecological circumstances.

Photos by courtesy of Philipp Meinecke and Nora Richter-Harder.

Bostryx voithianus

In an overlooked paper, Martinez de los Rios (2017) published new data on the distribution of this Chilean species. His abstract reads: “Bostryx voithianus (Pfeiffer, 1847) is reported, for the first time since its description, from northern Chile. In the origi-nal description, a particular type locality was not given for this species, but to it was described as collected in Chile by Thomas Bridges for the Hugh Cuming collection. Herein, the type locality is assigned to the Chilean Coastal Range between the places Cuesta La Arena (28.5721° S) and Quebrada Honda (29.5952° S), northern Chile”.

Schermafbeelding 2018-11-08 om 08.10.52

These Chilean Bostryx species are still a relatively understudied group, despite some recent literature, and it is always good to have new reports on their occurrences.

Reference:
Martinez de los Rios, E., 2017. Rediscovery of Bostryx voithianus (Pfeiffer, 1847) (Gastropoda, Pulmonata) in northern Chile, with notes on the type locality. – CheckList, 13 (6): 1125-1129.

Bostryx voithianus rediscovered

Just published: a rediscovery of one of the very rare Bostryx species from the Chilean coast by Martínez (2017).

Bostryx voithianus (Pfeiffer, 1847) is reported, for the first time since its description, from northern Chile. In the original description, a particular type locality was not given for this species, but to it was described as collected in Chile by Thomas Bridges for the Hugh Cuming collection. Herein, the type locality is assigned to the Chilean Coastal Range between the places Cuesta La Arena (28.5721° S) and Quebrada Honda (29.5952° S), northern Chile”.

This paper gives a good overview of the historical background of the material collected by Bridges, and a useful indication of the localities. Only empty shells were collected, the challenge to check if the species is extant still exists.

Reference:
Martínez, E., 2017. Rediscovery of Bostryx voithianus (Pfeiffer, 1847) (Gastropoda, Pulmonata) in northern Chile, with notes on the type locality. – CheckList, 13 (6): 1125-1129. https://doi.org/10.15560/13.6.1125

New records of Chilean snails

Based on a small collection already made in 1982, Araya et al. have just published a paper on the snail fauna near Antofagasta.

New records for Bostryx holostoma (Pfeiffer, 1846), Pupoides minimus (Philippi, 1860), Stephacharopa calderaensis Miquel & Araya, 2013 and an unidentified charopid species are presented on the basis of specimens collected near the city of Antofagasta, in northern Chile. This is the first record for S. calderaensis after its description, extending its known distribution about 350 km northwards. Details on the protoconch of B. holostoma are presented for the first time, and this species extends its distributional range 145 km southwards. The microhabitat of these species in litho-refugia may explain the presence of these minute terrestrial mollusks in hyper arid northern Chile, further highlighting the need of additional studies of this neglected fauna”.

Especially the protoconch structure of Bostryx holostoma is interesting, as this reveals a spiral structure which is not present in other Chilean Bostryx species. As unpublished DNA results of species from this genus from different countries reveal, this genus may well be polyphyletic.

Reference:
Araya, J.F. et al., 2017. New records of terrestrial mollusks (Gastropoda: Stylommatophora) from Antofagasta, northern Chile. – Revista Mexicana de Biodiversidad, 88: 769-772.

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.