Estudo da concha, rádula, mandíbula, teto da câmara palial e sistema reprodutor de duas espécies brasileiras de Thaumastus s. s. Martens in Albers, 1860 (Mollusca, Gastropoda, Stylommatophora, Bulimulidae)

Here are presented results about the hard and the soft parts morphology of two brazilian species of Thaumastus (Thaumstus) Martens in Albers, 1860 (MOLLUSCA, GASTROPODA, STYLOMMATOPHORA, BULIMULIDAE), proceeding from Espírito Santo State, Baixo Guandu district and from Minas Gerais State, Tiradentes district. There have been raised data that allowed the characterization and the distinction of these species in relation to the others of the subgenus refered to Brazil.São apresentados os resultados sobre a morfologia das partes duras e moles de duas espécies brasileiras de Thaumastus (Thaumastus) Martens in Albers, 1860 (MOLLUSCA, GASTROPODA, STYLOMMATOPHORA, BULIMULIDAE), procedentes do estado do Espírito Santo, Município de Baixo Guandu e do estado de Minas Gerais, município de Tiradentes. Foram levantados dados que permitiram a caracterização e distinção dessas espécies em relação às demais do subgênero referidas para o Brasil

Minaselates, a new genus and new species of Epiphragmophoridae from Brazil (Gastropoda: Stylommatophora: Helicoidea)

We describe a new genus and a new species in the family Epiphragmophoridae, Minaselates paradoxa sp. n. The new species was found at the National Park Cavernas do Peruaçu, in northern portion of the state of Minas Gerais, Brazil. Minaselates paradoxa sp. n. is classified in Epiphragmophoridae based on the fact that it shares the following diagnostic features of the family: a dart apparatus with a single dart sac, and two unequal mucous glands at the terminal genitalia. Minaselates gen. n. differs from Epiphragmophora Doering, 1874 by having a granulose protoconch, shell spire with blunt apex, complex microsculpture on the teleoconch and closed umbilicus fused with the shell wall. Also, significant differences between the two genera are the presence of a long and thin kidney that extends more than half the length of the pulmonary cavity, the presence of a flagellar caecum, and a smooth jaw in Minaselates gen. n. The finding of this new species and genus is particularly significant to refine the definition of the family, since Epiphragmophoridae has been traditionally diagnosed using the same characters of Epiphragmophora. Dinotropis Pilsbry & Cockerell, 1937, the other valid genus in the family, is monospecific and is only known by the morphology of the shell. In many ways it is similar to Epiphragmophora. A cladistics analysis was made in the present study which supports Minaselates gen. n. as a different entity and as sister group of the Epiphragmophora within Epiphragmophoridae.Fil: Cuezzo, Maria Gabriela. Consejo Nacional de Investigaciones Científicas y Técnicas. Centro Científico Tecnológico Conicet - Tucuman. Instituto de Biodiversidad Neotropical. Universidad Nacional de Tucuman. Facultad de Ciencias Naturales e Instituto Miguel Lillo. Instituto de Biodiversidad Neotropical. Instituto de Biodiversidad Neotropical; ArgentinaFil: Silva Pena, Meire. Pontificia Universidade Católica do Rio Grande do Sul; Brasi

Two new species of Thaumastus (Gastropoda: Pulmonata: Orthalicidae: Bulimulinae) from the state of Minas Gerais, Brazil

Two new species of Thaumastus (Thaumastus) from the state of Minas Gerais, southeastern Brazil, are described. They are diagnosed and characterized by the morphology of the shell and soft parts and compared with Brazilian species of the subgenus Thaumastus s.s. Martens, 1860. Thaumastus (T.) parvus sp. nov. is similar to T. (T.) baixoguanduensis Pena, Coelho & Salgado, 1996 but can be distinguished by the smaller size, smaller number of plates in the jaw, different number of follicle groups in the ovotestis and form of the fertilization complex. Thaumastus (T.) caetensis sp. nov. is similar to T. (T.) largillierti (Philippi, 1845) but differs by the width and the contour of the parietal side of the shell aperture. T. (T.) caetensis is also closer to Thaumastus (T.) baixoguanduensis but can be distinguished by the smaller dimensions (height, width and number of protoconch whorls), the lack of a transversal light band on the body whorl, the jaw with smaller number of plates, and the radula with 35 teeth. In the soft parts, this new species differs also in the number of follicle gatherings in ovotestis, fertilization complex with globose shape, and penian retractor muscle terminally and laterally attached to flagellu

Recharacterization of Strophocheilus miersi Da Costa (Mollusca, Pulmonata, Strophocheilidae)

Stropocheilus miersi Da Costa, 1904 is recharacterized by the conchology and morphology of the soft parts, the latter for the first time. Palial complex, reproductive and digestive systems provide important characteristics to enrich the knowledge of the genus Strophocheilus Spix, 1827. The presence of four arched folds in the posterior region of the pediose mass and the morphology of the suprapediose gland offered more data to identify and diagnose the species.Strophocheilus miersi Da Costa, 1904 é recaracterizado pela conquiologia e pela primeira vez a morfologia das partes moles. Complexo palial, sistemas reprodutor e digestivo forneceram importantes caracteres para enriquecer o conhecimento sobre Strophocheilus Spix, 1827. A presençca de quatro pregas arqueadas na região posterior da massa cefalopediosa e a morfologia da glândula suprapediosa acrescentaram dados para a diagnose da espécie

New species of Thaumastus from Lagoa Santa region, Minas Gerais State, Brazil (Mollusca, Gastropoda, Pulmonata, Bulimuloidea)

A new species of Thaumastus (Thaumastus) Martens, 1860, from Minas Gerais State, Brazil, is described and illustrated, based on the morphology of the shell, jaw, radula and soft parts