Strombus

1-11

Authors: Simone, L.R.L. & Turner, H.

The anatomy of the mitrid Ziba carinata, type species of the genus, is described based on a sample from Ghana, W. Africa. The species is characterized by very wide radular lateral teeth; a very short odontophore horizontal muscle; a strong, bifurcated, a dorsal muscle from radular sac to dorsal region of odontophore (m9); a pair of auxiliary retractor muscles for the radula (m2a); a very developed epiproboscis lacking an internal duct; the lack of accessory salivary glands; ducts of the salivary glands long and convolute; stomach with a circular, sphincter-like anterior muscle; and a very concentrated nerve ring with pair of statocysts located relatively away from it. The radular teeth are very wide and with long cusps. This description allows future revaluation of the genus and an analysis of its separation from closely related genera.

14-15

Authors: Jardim, J.A. & Simone, L.R.L..

A correction is provided in order to legitimate the formal availability of the name Hanleya brachyplax (Polyplacophora, Hanleyidae), wrongly attributed to Simone & Jardim in Rios, 2009. The correct citation will be Hanleya brachyplax Jardim & Simone, n. sp., this paper.

1-10

Authors: Leite, F.P.P.; Tambourgi, M.R.S. & Cunha, C.M.

Seasonal variations in the composition, density and number of species of gastropod molluscs associated with fronds and sediment retained on rhizoids of the green seaweed Caulerpa racemosa were studied on two beaches on the North coast of the State of São Paulo. The two beaches have different hydrodynamics and degrees of human impact. Samples were collected at Praia das Cigarras (moderately agitated, with strong human influence) in Sebastião, and at Praia da Fortaleza (sheltered and little human influence) in Ubatuba, during the four seasons of the year (winter, spring, summer and autumn). Three samples were obtained from each beach for every season of the year. Gastropod molluscs were identified, when possible, to species level and counted. A total of 50 species were identified, and their number and composition varied according to the season of the year and the beach. Few species were dominant in both sites and all four seasons. Most of the species occurred in low number and densities, and were not always present in all seasons of the year. The physical and biological characteristics of each beach, regarding macroalgae morphology, sediment retained by rhizoids and hydrodynamics, may be the variables controlling composition, number of species, dominance and density of gastropods.

19-23

Authors: Gomes, R.S.

Marine snails of the tropical family Conidae are represented in Brazilian waters by twenty species of the genus Conus. Brazilian cones have a similar shell structure, morphological study of both soft parts and radula, when they are available, are useful in recognizing inter-specific differences. Illustrated here for the first time, is the male genital system and radular tooth of Conus carioca Petuch, 1986, using both, optical and scanning electron microscope images, contributing to the knowledge of the species.

19-25

Authors: Padula, V.

This paper presents morphological data for Brazilian specimens of two sacoglossan species (Elysia subornata and Oxynoe antillarum), including color photos of living animals, scanning electronic microscope pictures of radula and penis morphology. Elysia subornata is characterized mainly by its papillose body and a very elongated renopericardial ridge. The variation found in body color and tooth morphology, as well as the wide geographical distribution attributed to this species, may be indicative of a species complex. Oxynoe antillarum is a light green species covered by small white dots which resembles Oxynoe azuropunctata, but in the latter the patches of the body are larger and more conspicuous. The material studied herein represents the first record of the order Sacoglossa in the state of Rio de Janeiro, Brazil.

30-31

Authors: Simone, L.R.L.

An annotated list of corrections is provided for the “Land and Freshwater Molluscs of Brazil” (2006)

1-7

Authors: Caetano, C.H.S.; Cardoso, R.S.; Braga, C.M. & Mattos, G.

This paper presents a check list of marine mollusks collected at Flexeiras beach, Itacuruçá Island, Rio de Janeiro state, Brazil. A total of 41 species, belonging to 36 genera and 28 families were identified. Bivalves showed the highest species richness. Our results suggested that the presence of rock fragments in sandy beaches enhances environmental heterogeneity and enable the settlement and recruitment of both sandy beach and rocky shore organisms increasing the biodiversity.

15-18

Authors: Simone, L.R.L.

A new trochid species, Falsimargarita terespira n. sp., is described from off the coast of Santa Catarina, southern Brazil. It was collected at a depth between 200 and 400 meters. This is the northern-most and the shallowest report of the genus. A discussion on similarities with congeners is given, showing that the shell of the new species differs mainly by the uniformity of its delicate sculpture and the rounded profile of its whorls. Most of the examined specimens were collected dead inside deep-sea corals.

1-6

Authors: Simone, L.R.L.

This paper deals with two ovulid species collected at Canopus Bank, off Fortaleza, Ceará, Brazil: Pseudosimnia vanhyningi (M. Smith, 1940) and Spiculata bijuri Cate, 1976. The samples consist of empty shells. This is the first time both have been reported on the northeastern Brazilian coast, therefore this is the southernmost record of them. Their taxonomy is revised based on the analysis of some variants of the shell that have been attributed to other species and genera. Aperiovula juanjosensii Perez & Gomez, 1997, and S. advena Cate, 1978, are proposed to be new synonyms of S. bijuri.

8-10

Authors: Simone, L.R.L.

Columbella costa, a new species from off Saquarema, Rio de Janeiro, Brazil, is described. This new species is characterized by its obesity; high spire; smooth, glossy surface; and by a deeper water habitat of 30-35 m. This is the second species of the genus found off the Brazilian coast and the only one occurring in its bathymetric range.