Monthly Archives: October 2014

Helicina from Brazil

In the Brazilian journal CheckList recently appeared new data on a Helicina species from off the coast of Rio de Janeiro.

Helicina Checklist10

“New records of Helicina inaequistriata Pilsbry, 1900 (Gastropoda: Helicinidae) are reported here from southeastern Brazil: Cabo Frio Island (“Ilha do Cabo Frio” in Portuguese), a continental island off Rio de Janeiro state, and three localities in São Paulo state (Mairiporã and Piracicaba municipalities and Alto Ribeira State and Tourist Park). The species was previously known only from Grande Island (“Ilha Grande”), off southern Rio de Janeiro, and two localities in São Paulo state (including the type locality). The occurrence of this species in well preserved areas such as Cabo Frio Island and Alto Ribeira Park is reassuring. The species is known from few localities and data on its abundance and conservation status are unknown”.

Reference:
Salvador, R.B., et al., 2014. New records of Helicina inaequistriata (Gastropoda: Helicinidae) from Rio de Janeiro and São Paulo states, Brazil. – CheckList 10 (4): 936–938. Available at http://biotaxa.org/cl/article/view/10.4.936.

Two new papers

Recently several new papers were published, of which two on Brazilian land snails are mentioned in this post.

This first is by Barbosa & dos Santos about morphological differences in a Happiella species at different localities in Ilha Grande.

Barbosa&dosSantos

The abstract reads: “We conducted a study on shell morphology variation among three populations of Happiella cf. insularis (Boëttger, 1889) inhabiting different areas (Jararaca, Caxadaço, and Parnaioca trails) at Vila Dois Rios, Ilha Grande, Angra dos Reis, state of Rio de Janeiro, Brazil. Linear and angular measurements, shell indices representing shell shape, and whorl counts were obtained from images drawn using a stereomicroscope coupled with a camera lucida. The statistical analysis based on ANOVA (followed by Bonferroni’s test), Pearson’s correlation matrix, and discriminant analysis enabled discrimination among the populations studied. The variable that most contributed to discriminate among groups was shell height. Mean shell height was greatest for specimens collected from Jararaca, probably reflecting the better conservation status of that area. Good conservation is associated with enhanced shell growth. Mean measurements were smallest for specimens from Parnaioca, the most disturbed area surveyed. Mean aperture height was smallest for specimens from Parnaioca, which may represent a strategy to prevent excessive water loss. Discriminant
analysis revealed that the snails from Jararaca differ the most from snails collected in the two other areas, reflecting the different conservation status of these areas: shells reach larger sizes in the localities where the humidity is higher. The similarities in shell morphology were greater between areas that are more similar environmentally (Caxadaço and Parnaioca), suggesting that conchological differences may correspond to adaptations to the environment”.

The second paper is by Salvador et al. correcting a lapsus in the neotype designation of Leiostracus subtuszonatus (Pilsbry, 1899). Now the illustration in Reeve’s Conchologica Iconica has been designated as lectotype.

Salvador et al f9

References:

Barbosa, A.B. & dos Santos, S.B., 2014. Morphology of the shell of Happiella cf. insularis (Gastropoda: Heterobranchia: Systrophiidae) from three forest areas on Ilha Grande, Southeast Brazil. – Zoologia 31: 230–238. Available at http://www.scielo.br/pdf/zool/v31n3/a04v31n3.pdf.

Salvador, B.R., Cavallari, D.C. & Breure, A.S.H., 2014. Corrigendum to “Taxonomic revison of Leiostracus onager and Leiostracus subtuszonatus (Gastropoda: Pulmonata: Orthalicidae)” by Salvador & Cavallari (2013). – Journal of Conchology 41: 627–628.

Polymita: a new book

For those who have ever wanted to see the astonishing colour diversity in Cuban tree snails of the genus Polymita, there is good news. After a very long and complicated process recently the new book by Adrián González finally appeared. It presents hundreds of colourful photographs of the six Polymita species and their natural environment, plus backgrounds on its malacohistory and the urging conservation issues for these over-hunted gems.

AGG_Polymita

Reference:
González Guillén, A., 2014. Polymita, the most beautiful land snail of the world. Carlos M. Estevez & Associates, Miami, 359 pp. (More info at the publisher: cecon14@aol.com)