Monthly Archives: March 2018

Santa Catarina snails

Ignacio Agudo-Padron has just published an updated systematic inventory of non-marine  snails from this southern Brazilian state.

The abstract reads: “Based on the last list of non-marine molluscs from Santa Catarina state, published in 2014, the current inventory of continental molluscs (terrestrial and freshwater) occurring in the State of Santa Catarina/SC is finally consolidated, with a verified/confirmed registry of 232 species and subspecies, sustained product of complete 22 years of systematic field researches, examination of specimens deposited in collections of museums and parallel reference studies, covering 198 gastropods (156 terrestrial, 2 amphibians, 40 freshwater) and 34 limnic bivalves, in addition to the addition of another new twelve (12) species (eighth land gastropods – Leptinaria parana (Pilsbry, 1906); Bulimulus cf. stilbe Pilsbry, 1901; Orthalicus aff. prototypus (Pilsbry, 1899); Megalobulimus abbreviatus Bequaert, 1848; Megalobulimus januarunensis Fontanelle, Cavallari & Simone, 2014; Megalobulimus sanctipauli (Ihering, 1900); Happia sp. (in determination process); Macrochlamys indica Benson, 1832 – and four bivalves – Corbicula fluminalis (Müller, 1774); Pisidium aff. dorbignyi (Clessin, 1879); Pisidium aff. vile (Pilsbry, 1897); Sphaerium cambaraense (Mansur, Meier-Brook & Ituarte, 2008) -). Among the species previously related, 26 correspond to exotic and invasive forms (22 gastropods, four bivalves). Additional information regarding its known regional geographic distribution is incorporated/included and updated”.

Schermafbeelding 2018-03-20 om 14.49.03

Personally I found it interesting that Plekocheilus (Eurytus) aff. rhodocheilus (Reeve, 1848) – previously known from one locality – has been collected at three different localities (Agudo-Padron, pers. comm.). As this figure reveals it was also collected alive, but unfortunately the material has not been preserved and so its status remains as only “partially resolved”.

Reference:
Agudo-Padron, I., 2018. Revised and Updated Systematic Inventory of Non-Marine Molluscs Occurring in the State of Santa Catarina/SC, Central Southern Brazil Region. – Advances in Environmental Studies, 2 (1): 54-60.
Available at http://servidordesmtp.com/kennel/AES-2-007.pdf

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New Tentacle issue available

Tentacle issue 26 is available now via this link. As always a very interesting overview of short papers and notes related to the conservation of molluscs.

The issue starts with an In Memoriam for Tony Whitten (1953-2017) who, although mainly involved with conservation in Asia, has been of importance for stimulating malacologists for conservation issues. This is best illustrated by a quote from 2001 which was added by the editor: “I would venture to suggest that the majority of malacologists need to poke their heads out from the security of their shells and slither rapidly to be heard and become involved in the issues that threaten the organisms on which their careers are based. This does not mean that this topic take over your own particular speciality and distract your research programme, but it does recognize that you have a profound responsibility to do something [my italics]. The actual and potential threats to many mollusc species, and the trends, can’t get much worse”.

Related to the Neotropics, the following notes are included:

1. Espinosa, A. Measures to control Lissachatina fulica: impact on native terrestrial molluscs in the Dominican Republic.
This papers tells the story how an area of secondary forest, where in August 2017 nine endemic species were found, plus the achatinid, was a few months later completely ‘treated’ with molluscicides and deforestation.

2. Santos, S.B. dos & Miyahira, I.G. Evaluation of the list of endangered non-marine molluscs in Brasil in progress.

3. Agudo-Padron, I. Conservation of non-marine molluscs in Central Southern Brasil: revised and updated inventory of species of Santa Catarina State.

4. Salvador, R.B. et al. Presumed extinct land snail Megalobulimus cardosoi found again in Pedra Talhada Biological Reserve, north-east Brasil.

New Hispaniolan Annulariids

Already some months ago, Thomas Watters published a new revision dealing with Hispaniolan annulariids (Watters & Larson, 2017).

The annulariid genera Chondropomella, Chondropomium, and Clydonopoma are believed to have originated from the Tiburon/Barahona Peninsula in isolation from the rest of Hispaniola. Chondropomium has colonized the rift valley and adjacent river valleys between the Tiburon Peninsula and the remainder of Hispaniola. It is primarily limited to xeric lowlands, rarely found above 200 m elevation. Little is known about the rare Chondropomella but they seem to occur in the rift valley in xeric areas as well. In contrast, Clydonopoma is endemic to the Sierra Baoruco with a single species in the adjacent eastern Massif de la Selle and occupies the upland mesic forests and pine savannahs between 200–4000 m. The most widely distributed species, Chondropomium weinlandi, has been the subject of considerable confusion concerning the nature of its many color forms or subspecies, as well as its valid name. This species was investigated using phylogenetic methods and compared to congeners and related genera. A phylogenetic study aimed at elucidating relationships among these taxa analyzed a partitioned matrix of nuclear (ITS 1) and mitochondrial (CO1, 12S, 16S) DNA sequences in a Maximum-likelihood framework under the GTR+G substitution model. Contrary to Bartsch’s 1946 assessment that C. weinlandi is a complex of subspecies, it is here shown to be a single, highly polymorphic species for color. The new genus Superbipoma is recognized based on phylogenetic, radular, and conchological evidence. It contains two species: S. asymmetricum (Henderson and Simpson, 1902) and S. superbum (Pilsbry, 1933). Eleven species of Chondropomium are recognized including two new species: C. caelicum and C. sardonyx; three species of Chondropomella and nine species of Clydonopoma, including one new species, Clydonopoma titanum, are recognized. A calcified operculum is the ancestral condition for the Annulariidae. In Clydonopoma and Chondropomella the operculum is a particularly complex calcified structure termed the pseudolamella. This structure has been lost in Chondropomium and Superbipoma”.

As usual, this paper is very thorough, well organised and includes a phylogenetic study based on a multi-locus analysis.

Reference:
Watters, G.T. & Larson, P., 2017. A revision of the Hispaniolan genera Chondropomella, Chondropomium, and Clydonopoma (Gastropoda: Annulariidae), with the recognition of a new genus, Superbipoma: phylogenetic, radular, and conchological evidence. – Nautilus, 131 (3):163-201.

Gastropods on Rio de Janeiro campus

Alexandre et al. recently published on species they found on one of the campus of Rio de Janeiro’s university. The abstract reads “Gastropoda is the most diverse group of Mollusca. However, many gaps still exist in the knowledge of this group, for example, for terrestrial and freshwater gastropods. Thus, this work presents a mollusk survey of the Urca campus of the Universidade Federal do Estado do Rio de Janeiro, which is bordered by Parque Natural Municipal da Paisagem Carioca and is within the buffer zone of Monumento Natural dos Morros do Pão de Açúcar e da Urca. Eleven collecting sites were chosen and the mollusks were collected directly. A total of 1,829 specimens, distributed in 18 species and 12 families, were found. Considering the number of native species and the first record of one species for Rio de Janeiro State, the present study shows the importance of protected urban areas in the conservation of fauna”.

The paper itself is in Portuguese.

Reference:
Alexandre, G. de L., et al., 2017. Gastropods (Mollusca) present on the Urca campus of the Universidade Federal do Estado do Rio de Janeiro (UNIRIO). – Biotemas, 30 (4): 31-40. (Link)