BIVALVES FÓSSEIS DO GÊNERO NEITHEA (BIVALVIA: PECTINIDAE) E SEU SIGNIFICADO PALEOBIOGEOGRÁFICO PARA O DOMINIO TETIANO NA BACIA POTIGUAR

Neithea é um gênero de ampla distribuição geográfica no Cretáceo. No Brasil é encontrado em bacias sedimentares interiores, apesar disso ainda não havia registro desse gênero para a bacia Potiguar no Nordeste do Brasil. O objetivo desse trabalho foi realizar o primeiro registro de Neithea para essa bacia sedimentar e analisar sua distribuição paleobiogeográfica. Os fósseis foram coletados no município de Governador Dix-Sept Rosado (05°27’32"S 37°31’15"W) no estado do Rio Grande do Norte, Brasil. Essa região está inserida na bacia Potiguar, que possui as formações fossilíferas Açu e Jandaíra. Os exemplares foram identificados como indivíduos da espécie Neithea (Neithea) coquandi e representam o primeiro registro do gênero para a bacia Potiguar ampliando a distribuição geográfica do gênero no continente sul-americano. Palavras-chave: Formação Jandaíra, Moluscos fósseis, Paleogeografia

Mollusks Found Inside Octopus (Mollusca, Cephalopoda) Pots in the State of Ceara, Northeast Brazil

The fishery of octopus in the State of Ceará is being carried out in the coast of Fortaleza, Redonda Beach (Icapuí) and Itarema where 2 species can be found, Octopus insularis and O. vulgaris. The objective of this study was to investigate which prey species of mollusks were found inside the pots used in the octopus fishery. Unbaited octopus pots were set in Redonda Beach at 30 meters depth, in Fortaleza at 27 meters depth, and in Itarema at 30 meters depth. The species found inside the octopus pots that were consumed by Octopus vulgaris and O. insularis were mainly gastropods and bivalves. It was found 32 species of mollusks, being 17 of gastropods and 15 of bivalves. Redonda Beach presented the higher number of mollusk species in the octopus pots, with 85% of the total. The most preyed gastropod species was Aliger costatus (35.6%) and the most preyed bivalve species was Anadara notabilis (54.5%). Among the gastropods, 54% had a bore hole, the majority on the spire in the ventral side of the shell. This location is probably due to the presence of the columelar muscle, where it can inject the poison. Only 4.3 % of the bivalves found inside the octopus pots presented bore holes. Empty shells were censured in the field to indicate the magnitude of octopus predation relative to other sources of mortality and the percentage of empty shells with octopus drill holes ranged from 14% to 69%

Sea slugs (Gastropoda: Heterobranchia) from Rio Grande do Norte, Northeastern Brazil

Heterobranch sea slugs (Gastropoda) present reduction, internalization, or absence of shell, and include more than 6,000 described species. Approximately 250 species are recorded from Brazil but only 14 had been previously recorded from Rio Grande do Norte, on the Brazilian northeastern coast. As a result of different expeditions conducted between 2008 and 2020, species were collected and identified. Among them, five species were recorded for the first time from the South Atlantic Ocean: Chelidonura hirundinina (Quoy & Gaimard, 1833); Sclerodoris prea (Ev. Marcus & Er. Marcus, 1967); Thuridilla malaquita Ortea & Buske, 2014; Berthella nebula Ghanimi, Schrödl, Goddard, Ballesteros, Gosliner & Valdés, 2020 and Berthella vialactea Ghanimi, Schrödl, Goddard, Ballesteros, Gosliner & Valdés, 2020. Thirty-six species are recorded for the first time from Rio Grande do Norte. The present survey expands the knowledge of the diversity of sea slugs from Brazil and supports the hypothesis of similarity between the heterobranch sea slug fauna from the northeastern Brazil and the Caribbean Sea

Reef Bioconstructors of Rocas Atoll, Equatorial South Atlantic.

http://dx.doi.org/10.5007/2175-7925.2011v24n2p37This study presents a analysis of reef bioconstructors at Rocas Atoll, Northeast of Brazil, sampled in January and February of 2008. The results show the presence of a community made up mainly of calcareous algae (Porolython pachydermum, Sporolython sp., Lythoporella sp., Lythophyllum sp.), corals (Siderastrea stellata, Favia gravida), vermetids (Dendropoma irregular, Petaloconchus varians) and foraminifers (Homotrema rubrum) in the reef formation. This taxonomic survey show the importance of a different species during the carbonate growth process of the only Atoll of the Equatorial South Atlantic

Família Turbinellidae Swainson, 1840: Turbinella laevigata Anton, 1839

Turbinella laevigata Anton, 1839 is endemic of Brazil occurring from the state of Amapá up to the state of the Espirito Santo. It inhabits burrows in sand or mud next to beach rocks and is found from the intertidal zone up to 40 meters of depth. Turbinella laevigata has a large shell measuring up to 180 mm in length. The teleoconch has eight whorls of marked sutures and the protoconch is mamiliform, with three smooth whorls with deep sutures and the separation to the teleoconch well defi ned (Matthews-Cascon, 1985). The color of the shell is dull white, but is often hidden by a thick, brown periostracum. Turbinellidae species are gonochoristic and present internal fertilization.Turbinella laevigata Anton, 1839 é endêmico do Brasil, ocorrendo desde o Estado do Amapá até o Estado do Espírito Santo. Essa espécie habita locas na areia ou lama próximas a beach rocks e é encontrada desde a zona intertidal até 40 metros de profundidade. Turbinella laevigata tem uma concha grande medindo até 180 mm em comprimento. A teleoconcha possui oito voltas de suturas marcadas e a protoconcha é mamiliforme, com três voltas lisas com suturas profundas e separação da teleoconchabem defi nida. A cor da concha é branca opaca, mas é frequentemente coberta por um perióstraco fi no e marrom. As espécies de Turbinellidae são gonocorísticas e apresentam fertilização interna.Fil: Matthews Cascon, Helena. Universidade Federal Do Ceara; BrasilFil: de Almeida Rocha Barreira, Cristina. Universidade Federal Do Ceara; BrasilFil: Oliveira de Meirelles, Carlos Augusto. Universidade Federal Do Ceara; BrasilFil: Bigatti, Gregorio. Consejo Nacional de Investigaciones Científicas y Técnicas. Centro Nacional Patagónico; ArgentinaFil: Penchaszadeh, Pablo Enrique. Consejo Nacional de Investigaciones Científicas y Técnicas. Oficina de Coordinación Administrativa Parque Centenario. Museo Argentino de Ciencias Naturales "Bernardino Rivadavia"; Argentin

The Increasing Incidence of Imposex in Stramonita Haemastoma(Mollusca: Gastropoda: Muricidae) After the Establishment of the Pecém Harbor, Ceará State, Northeast Brazil

Imposex is characterized by the development of masculine sexual organs in neogastropod females,caused by organotin contamination of the seawater. These compounds,as tributyltin (TBT), are used world-wide as biocidal agents in antifouling paints, commonly used to covering boats and off shore metallic structures. Five sampling sites were determined along the coast of Ceará State, Northeast Brazil in March 2001. In each site were collected 50 adults of neogastropod Stramonita haemastoma and indexes that quantify imposex (% imposex, RPLI,RPSI and VDSI) were observed. Other two collecting times were conducted (April 2003 and March 2004) at the same sites and imposex indexes were observed again. The indexes observed in the three collecting times showed an increase in the incidence of imposex at the sampling sites, probably caused by the establishment of Pecém Harbor and its increasing shipping activities