Biologia populacional e produção secundária de Olivancillaria vesica vesica (Gmelin, 1791) (Gastropoda : Olividae) na praia da Restinga da Marambaia, RJ

Monthly samples were carried out between June 1998 and August 2000 in Restinga da Marambaia beach, RJ with the purpose of study the population biology and secondary production of Olivancillaria vesica vesica (Mollusca: Gastropoda: Olividae). Specimens were handmade collected in two transects and the lenght and width of your shells were measured in the field. Growth and mortality was estimated using computer based methods of lenght-frequency data contained in FISAT package. Life span was estimated by inverse von Bertalanffy growth equation considering tmax as the 95% of the asymptotic lenght. Hynes and Crisp 3A methods were utilized for the calculation of secondary production. Highest population densities were observed during winter (September 1998 and 1999) and autumn (June 2000). Parameters estimated indicate moderated seasonal oscillations in growth with the slowest growth rates occuring in late summer (1st year) and spring (2nd year). Life span varied between 4.28 and 4.99 years. Secondary production estimatives varied between 0.142 and 0.213g AFDW m-2 year -1. The sex ratio was 1.18 for males. Occurence of imposex in females of this species was observed.CAPESFAPERJAmostragens mensais foram realizadas entre junho/1998 e agosto/2000 na praia da Restinga da Marambaia, RJ com o intuito de estudar a biologia populacional e a produção secundária de Olivancillaria vesica vesica (Mollusca: Gastropoda: Olividae). Os animais foram coletados manualmente em dois transectos e tiveram o comprimento e a largura de suas conchas medidos em campo. O crescimento e a mortalidade foram estimados através de métodos computacionais baseados nos dados de frequência de comprimentos contidos no programa FISAT. A longevidade foi estimada pela equação invertida de von Bertalanffy considerando como tmax 95% do comprimento assintótico. Os métodos de Hynes e Crisp 3A foram utilizados para o cálculo da produção secundária. Picos populacionais foram observadas durante o inverno (setembro/1998 e 1999) e outono (junho/2000). Os parâmetros estimados indicam crescimento com moderada oscilação sazonal onde as menores taxas de crescimento ocorreram no final do verão (1º ano) e primavera (2° ano). A longevidade variou entre 4,28 e 4,99 anos. As estimativas de produção secundária variaram entre 0,142 e 0,213 g PSLC m-2 ano-1. A proporção sexual foi de 1,18 para os machos. Foi observado a ocorrência do fenômeno de masculinização das fêmeas (Imposex) nessa espécie

Cianobactérias Psâmicas Marinhas da Praia das Flexeiras, Estado do Rio de Janeiro, Sudeste do Brasil

Flexeiras beach (22º56' S, 43º53'W) is located at Ilha de Itacuruçá (Itacuruçá Island) in Sepetiba Bay, on the southern coast of Rio de Janeiro State. It is a protected beach in relation to wave exposition, due to its geographic position, which faces the opening Bay. This work aims at contributing with the knowledge of abundance of psamic cyanobacteria species, which compound Brazilian sea-communities. It had occurred monthly collections, from December 2006 to January 2008, during syzygy's low tide. Samples were obtained through PVC pipes, measuring 1,5 cm of internal diameter and 6 cm length. They were also fractionated into 3 segments, 2 cm distant. After that, samples had been places in opaque plastic flasks referring to each segment and preserved in a 4% formol aqueous solution. Flexeiras beach has sediments made by sand, presenting grain size varying from 0,22 to 0,32 mm (fine sand). Estimated average declivity was of 1/21,4m (À 4,07) and 1/28,7m (À 15,8), respectively, for two transects. The water chlorophyll concentration in interdital areas presented an average of 3,03 g/L (À2,29) and total Phosphorus presented an average of 0,12 mg/L (À 0,04). Average salinity was of 35%, don't having considerable oscillations during the months studied. The qualitative analysis has detected the presence of 12 psamic cyanobacteria tax. Family Chroococcaceae Nägeli 1849 is the most frequent, responsible for 33,4% of encountered species. The geological importance of psamic cyanobacteria is intrinsically associated to the fact of them composing the first unconsolidated substract for microbial mats' formation, essential structures in this group preservation.A Praia das Flexeiras (22º56' S e 43º53' W) está localizada na Ilha de Itacuruçá na Baía de Sepetiba, no litoral sul do estado do Rio de Janeiro. É uma praia protegida em relação à exposição de ondas, devido a sua posição geográfica perante a saída da baía. Este trabalho visa contribuir com o conhecimento da riqueza de espécies de cianobactérias psâmicas, que compõem as comunidades marinhas brasileiras. Foram realizadas coletas mensais, no período de dezembro de 2006 a janeiro de 2008, durante a maré baixa de sizígia. As amostras foram retiradas através de tubos de PVC, com diâmetro interno de 1,5 cm e comprimento de 6 cm, e fracionadas em três segmentos distando 2 cm. Posteriormente, foram colocadas em frascos plásticos opacos referentes a cada segmento e conservadas em solução aquosa de formol a 4%. A praia das Flexeiras possui sedimento constituído por areia, apresentando tamanho de grão variando de 0,20 - 0,32 mm (areia fina). A declividade média estimada foi de 1/21,4 m (À4,07) e 1/28,7 m (À15,8), respectivamente. A concentração de clorofila da água na região entremarés apresentou uma média de 3,03 μg/L (À2,29) e o fósforo total apresentou média de 0,12 mg/L (À0,04). A salinidade média foi de 35%. A análise qualitativa demonstrou a presença de 12 taxa de cianobactérias psâmicas. A família Chroococcaceae Nägeli 1849 é a mais frequente, respondendo por 33,4% das espécies encontradas. A importância geológica das cianobactérias psâmicas está associada ao fato de comporem o primeiro substrato inconsolidado para a formação das esteiras microbianas, estruturas primordiais na conservação desse grupo

Polyschides xavante Caetano & Absalão, 2005, n. sp.

Polyschides xavante n. sp. (Figs. 1–4) Diaz & Puyana, 1994: 258, pl. 71, fig. 1050 as P. tetrodon (Pilsbry & Sharp, 1897). Description: Shell small, slender, moderately curved, strong and white. The increase in diameter of the shell is very slight and there is no conspicuous swelling; the greatest diameter is located near the anterior aperture. Apical shell aperture nearly circular, cut by four deep notches, forming four triangular lobes: lobe on convex side slightly longer, lobe on concave side truncated, and two lateral lobes. The external surface, appearing smooth under optical microscope, is papillated at higher magnifications. Anterior aperture subcircular, slightly depressed and oblique. Dimensions (range in mm): L 4.89 –6.00; Max 0.58–0.84; Dmax 0.37 –2.00; Arc 0.21– 0.42; Larc 1.32–2.32; Ha 0.47–0.58; Wa 0.47–0.68; Hp 0.26–0.42; Wp 0.32–0.47. Type material: Holotype: IBUFRJ 14.190; Paratypes: MCZ 350337 [5]; MNRJ 10.313 [6]; UERJ 3.045 [6]; MORG 41.075 [6]; MZUSP 43.518 [5], all paratypes from type locality. Type locality: Sancho Bay (03º 51 'S, 32 º 26 'W), Fernando de Noronha Island, Pernambuco State, northeastern Brazil, 10– 15 m. Known distribution: Western Atlantic; Colombia (Diaz & Puyana 1994) and Fernando de Noronha Island, Brazil. But, possibly, occurring over all north coast of South America. Shallow water species, 0 to 15 m. Etymology: xavante is the name of an Indian tribe in Brazil. Proposed as a noun in apposition. Remarks: Polyschides tetraschistus (Figs. 5–8) is the most similar species to P. xavante in the western Atlantic. Polyschides xavante has a smaller and more slender shell than P. tetraschistus. Polyschides portoricensis (Figs. 9–13) is easily distinguishable from the former two species by the obvious swelling at the anterior third of the shell. Examination of the external shell surface under high magnification showed that P. xavante and P. tetraschistus share a microsculpture formed by papillae, higher and at least in some areas arranged in circular rings over the entire shell in P. xavante (Fig. 4), and smaller and homogeneously distributed in P. tetraschistus (Fig. 8). Polyschides portoricensis has no such microsculpture (Fig. 13). Comparisons of shell measurements corroborated the distinctions among these species. Table 2 lists the mean, standard deviation, minimum and maximum values for each morphometric parameter. All morphometrics parameters differed significantly (Kruskal­ Wallis test; p<0.001) at least between two of the three species. Polyschides xavante is significantly different from the other two species in 10 out of 15 parameters (Table 2). This species is significantly smaller and less arched than P. tetraschistus and P. portoricensis. The maximum diameter, height and width of the anterior aperture, and height and width of the apical aperture were also significantly smaller compared to the other species. The maximum diameter in P. xavante and P. tetraschistus is located closer to the aperture than in P. portoricensis. Polyschides tetraschistus CRPC 1.482 Abaco, Bahamas (26 º 00' 00" N, 77 º 24 ' 28 " W) ­ 6 CRPC 9.042 Abaco, Bahamas (26 º 44 ' 30 " N, 77 º 12 ' 30 " W) 23 6 MZUSP 25.769 off Pará (00º 02' N, 45 º 48 ' W) 75 1 CMPHRM 1.702 Geomar III # 149 (01º 55 ' 30 '' N, 47 º 41 ' 00'' W) 57 10 ...... continued on the next page The multivariate Discriminant Function Analysis was able to distinguish between the three species (Wilks' Lambda = 0.02; F 14,194 = 71.16; p <0.0000). This analysis classifies 100 % of the cases correctly (Fig. 15). The model was constructed with seven parameters (L, Max, L: Max, Wa, Ha: Wa, WI, Larc: L). The variables Ha and Dmax, which were highly correlated with other variables (Ha vs. Max, r = 0.91; Ha vs. Wa, r = 0.93; Dmax vs. LI, r = 0.94), were excluded. The Discriminant Functions (DF) based on the raw coefficients of canonical variables are shown below: DF 1 = 5.25487 L + 0.76610 Max ­ 4.35310 L: Max ­ 5.88253 Wa ­ 1.98005 Ha: Wa + 3.23778 WI + 0.57313 Larc: L DF 2 = ­ 2.84063 L + 6.55201 Max + 2.28387 L: Max ­ 2.56450 Wa + 0.30526 Ha: Wa ­ 0.25672 WI ­ 0.19054 Larc: L P. xavante (n= 29) P. portoricensis (n= 27) P. tetraschistus (n= 50) KW Dunn’s test mean (SD) min ­ max mean (SD) min ­ max mean (SD) min ­ max L 5.47 (0.30) 4.89 –6.00 7.39 (0.52) 6.16–8.63 6.84 (1.60) 4.29–9.25 25.32 Revision of the Brazilian material revealed the occurrence of three species of Polyschides along the coast: P. tetraschistus, P. portoricensis and P. xavante. Henderson (1920: 116) based his description of P. portoricensis on a single specimen collected in Mayaguez Harbor, Puerto Rico, and stated "Some uncertainty attaches to the apical features, which I hope may be removed by receipt of better material." Our material has deeper notches than reported by Henderson. Although Henderson´s description did not mention the presence of a pleat on the inner surface of the apex ventral lobe (Fig. 12), such differences may be related to the state of conservation of the type material. Diaz and Puyana (1994: fig. 1049) also illustrated such a pleat in P. portoricensis. This species was previously recorded in the Caribbean Sea (Puerto Rico: Henderson 1920; Warmke & Abbott 1962) and north Brazil (off Amapá: Rios 1994). The new material examined here extends its geographical distribution southward, to the state of Rio de Janeiro (21 º S). Polyschides tetrodon was not included in the morphometrical analysis, because there are no valid reports of this species from Brazil. Examination of the type illustration (Fig. 14) shows that it may be close to P. portoricensis, since both species share a swelling in the shell. Polyschides tetrodon has a more fusiform shell and shorter shell length (ca. 5 mm). The shell showed by Diaz and Puyana (1994: 258, pl. 71, fig. 1050) as P. tetrodon is, in fact, P. x a v a n t e.Published as part of Caetano, Carlos Henrique Soares & Absalão, Ricardo Silva, 2005, A new species of the genus Polyschides Pilsbry & Sharp, 1898 (Mollusca, Scaphopoda, Gadilidae) from Brazilian waters, pp. 1-10 in Zootaxa 871 on pages 3-8, DOI: 10.5281/zenodo.17088

Polyschides Pilsbry & Sharp 1898

Genus Polyschides Pilsbry & Sharp, 1898 Type species: Cadulus tetraschistus Watson, 1879, by original designation.Published as part of Caetano, Carlos Henrique Soares & Absalão, Ricardo Silva, 2005, A new species of the genus Polyschides Pilsbry & Sharp, 1898 (Mollusca, Scaphopoda, Gadilidae) from Brazilian waters, pp. 1-10 in Zootaxa 871 on page 3, DOI: 10.5281/zenodo.17088

Gadila simpsoni Henderson 1920, n. comb.

&lt;i&gt;Gadila simpsoni&lt;/i&gt; (Henderson, 1920) n. comb. &lt;p&gt;Figs. 81&ndash;83&lt;/p&gt; &lt;p&gt; + &lt;i&gt;Cadulus (Platyschides) simpsoni&lt;/i&gt; Henderson 1920: 127, pl. 19, fig. 17. + &lt;i&gt;Cadulus simpsoni&lt;/i&gt;: Steiner and Kabat 2001: 441; 2004: 644.&lt;/p&gt; &lt;p&gt; &lt;i&gt;Type material&lt;/i&gt;&lt;/p&gt; &lt;p&gt;Holotype USNM 161580; Paratypes USNM 314677, 1 dd, USNM 314932, 1 dd, AMNH 148357, 1 dd.&lt;/p&gt; &lt;p&gt; &lt;i&gt;Type locality&lt;/i&gt;&lt;/p&gt; &lt;p&gt;Mayaguez Roadstead, Porto Rico, USBF sta 6062, 46 m (by original designation).&lt;/p&gt; &lt;p&gt; &lt;i&gt;Diagnosis&lt;/i&gt;&lt;/p&gt; &lt;p&gt;Shell medium (to 6 mm), slender, translucent cream&shy;white, slightly curved, maximum diameter close to equator. Ventral side regularly curved; dorsal one almost straight except for some curvature at posterior end and a gently convexity at the equator. Apex simple, sligthlty dorsoventrally depressed, showing central denticle&shy;like at inner side of ventral edge. Preapical callus thin, lumen suboval. Oral aperture simple, strongly oblique, slightly contracted, laterally compressed.&lt;/p&gt; &lt;p&gt; &lt;i&gt;Material examined&lt;/i&gt;&lt;/p&gt; &lt;p&gt; Holotype of &lt;i&gt;Gadila simpsoni&lt;/i&gt;; IBUFRJ 14315, sta A3, 3 dd; IBUFRJ 14316, sta C13, 13 dd; IBUFRJ 14317, sta R4#1, 21 dd; MNHN, sta 25A, 3 dd; IBUFRJ 14318, Jops II, sta 3216, 21 &ordm;37&rsquo;S, 40&ordm;08&rsquo;W, 300 m, 7 dd.&lt;/p&gt; &lt;p&gt; &lt;i&gt;Distribution&lt;/i&gt;&lt;/p&gt; &lt;p&gt;Antigua: off English Harbor; Porto Rico; Cuba (Henderson 1920); Brazil: Bahia, Esp&iacute;rito Santo, Rio de Janeiro (this study). Shells 46 to 575m (Henderson 1920).&lt;/p&gt; &lt;p&gt; &lt;i&gt;Remarks&lt;/i&gt;&lt;/p&gt; &lt;p&gt; &lt;i&gt;Gadila simpsoni&lt;/i&gt; is smaller and less arched than &lt;i&gt;G. pandionis&lt;/i&gt; and the aperture of &lt;i&gt;G. simpsoni&lt;/i&gt; is laterally compressed. Steiner and Kabat (2004) placed this species in &lt;i&gt;Cadulus&lt;/i&gt; because of the position of the region of the maximum diameter of the shell which, according to these authors, is located in the middle of the shell. However, in his original description, Henderson (1920: 127) stated that &quot;its equator at about the anterior two&shy;fifths or almost median&quot; and the observation of our material agree with Henderson&rsquo;s opinion. So, we include this species in the genus &lt;i&gt;Gadila&lt;/i&gt;.&lt;/p&gt;Published as part of &lt;i&gt;Caetano, Carlos Henrique Soares, Scarabino, Victor &amp; Absalão, Ricardo Silva, 2006, Scaphopoda (Mollusca) from the Brazilian continental shelf and upper slope (13 º to 21 ºS) with descriptions of two new species of the genus Cadulus Philippi, 1844, pp. 1-47 in Zootaxa 1267&lt;/i&gt; on pages 40-41, DOI: &lt;a href="http://zenodo.org/record/173183"&gt;10.5281/zenodo.173183&lt;/a&gt

Graptacme Pilsbry & Sharp 1897

&lt;i&gt;Graptacme&lt;/i&gt; Pilsbry &amp; Sharp, 1897 &lt;p&gt; &lt;i&gt;Type species&lt;/i&gt;&lt;/p&gt; &lt;p&gt; &lt;i&gt;Dentalium eboreum&lt;/i&gt; Conrad, 1846 (subsequent designation by Woodring, 1925: 201).&lt;/p&gt; &lt;p&gt; &lt;i&gt;Diagnosis&lt;/i&gt;&lt;/p&gt; &lt;p&gt;Shell medium to large, slightly to well curved, fragile, polished to shiny, except apical portion; translucent white or salmon near the apex. Fine, close longitudinal striae, prominent near apex; anterior half of shell usually smooth. Apex simple, truncate with apical callus, lumen variable in shape, or with deep irregular slit at dorsal side or laterally disposed. Circular in section, oral aperture generally thin, translucent.&lt;/p&gt;Published as part of &lt;i&gt;Caetano, Carlos Henrique Soares, Scarabino, Victor &amp; Absalão, Ricardo Silva, 2006, Scaphopoda (Mollusca) from the Brazilian continental shelf and upper slope (13 º to 21 ºS) with descriptions of two new species of the genus Cadulus Philippi, 1844, pp. 1-47 in Zootaxa 1267&lt;/i&gt; on page 19, DOI: &lt;a href="http://zenodo.org/record/173183"&gt;10.5281/zenodo.173183&lt;/a&gt

Graptacme perlonga Dall 1881

&lt;i&gt;Graptacme perlonga&lt;/i&gt; (Dall, 1881) &lt;p&gt;Figs. 44&ndash;45&lt;/p&gt; &lt;p&gt; + &lt;i&gt;Dentalium perlongum&lt;/i&gt; Dall 1881: 36; 1889: 76, pl. 27, fig. 6.&lt;/p&gt; &lt;p&gt; + &lt;i&gt;Dentalium (Laevidentalium) perlongum&lt;/i&gt;: Pilsbry and Sharp 1897: 104, pl. 18, figs. 10, 11; Henderson 1920: 75, pl. 9, fig. 1; Maury 1922: 38; Lange de Morretes 1949: 54; Turner 1955: 313; Rios 1970: 144.&lt;/p&gt; &lt;p&gt; + &lt;i&gt;Graptacme perlongum&lt;/i&gt;: Scarabino 1985: 199, pl. 72, fig. 1018; 1994: 307, pl. 105, fig. 1506. + &lt;i&gt;Graptacme perlonga&lt;/i&gt;: Steiner &amp; Kabat 2001: 446; 2004: 629.&lt;/p&gt; &lt;p&gt; &lt;i&gt;Type material&lt;/i&gt;&lt;/p&gt; &lt;p&gt;Lectotype MCZ 7752 (designated by Turner, 1955: 319 as &quot; Holotype &quot;); Paralectotypes MCZ 7660, 1 dd, MCZ 7661, 1 dd, MCZ 7663, 1 dd, MCZ 7664, 3 dd.&lt;/p&gt; &lt;p&gt; &lt;i&gt;Diagnosis&lt;/i&gt;&lt;/p&gt; &lt;p&gt;Shell long (to 90 mm), slender, solid, almost straight. Surface smooth but apical portion shows longitudinal striae. Apex with a U&shy;shaped notch on ventral side.&lt;/p&gt; &lt;p&gt; &lt;i&gt;Material examined&lt;/i&gt;&lt;/p&gt; &lt;p&gt; Lectotype and Paralectotype MCZ 7660 of &lt;i&gt;Graptacme perlonga&lt;/i&gt;; IBUFRJ 13866, sta 517, 1 dd; IBUFRJ 14309, off Bacia de Campos, Rio de Janeiro, 1000&ndash;1600 m, 3 lv, 20 dd.&lt;/p&gt; &lt;p&gt; &lt;i&gt;Distribution&lt;/i&gt;&lt;/p&gt; &lt;p&gt;USA: North Carolina to Florida; gulf of Mexico; Grenada (Henderson 1920); Brazil: Cear&aacute; (Henderson 1920), Bahia and Rio de Janeiro (this study). Living 1000&ndash;1600 m (this study), empty shells 200 to 4850 m (Steiner &amp; Kabat 2004).&lt;/p&gt; &lt;p&gt; &lt;i&gt;Remarks&lt;/i&gt;&lt;/p&gt; &lt;p&gt; Turner (1955: 319) recognized the specimen from MCZ 7752 as the only one that agrees with the original description and illustration of &lt;i&gt;Graptacme perlonga&lt;/i&gt;, wrongly using the term holotype to designate this specimen since Dall (1881) did not designate a holotype. Steiner &amp; Kabat (2004) considered Turner&rsquo;s &quot; holotype &quot; as the lectotype. Turner&rsquo;s use of the term &quot; holotype &quot; falls within the conditions of ICZN Art. 74.5 to accept a &quot; holotype &quot; indication as a lectotype designation, because Turner (1955) knewn that Dall (1881) did not select any specimen as holotype. Turner&rsquo;s lectotype designation is valid.&lt;/p&gt; &lt;p&gt; Henderson (1920) cited specimens from Rio de Janeiro and off Rio de la Plata, Uruguay, the latter also indicated by Scarabino (1973). Penna&shy;Neme (1974) recorded this species from the coast of Maranh&atilde;o, at Ilha Grande&shy;Rio de Janeiro and south of Brazil. Cabral and Mello (1994: 38, fig. 9) reported it for the states of Cear&aacute; and Alagoas. We do not consider those records to belong to &lt;i&gt;G. perlonga&lt;/i&gt;, because all were based on specimens gathered in depths ranging from the shore to 170 m, while this species has a bathyalabyssal distribution being collected from depths greater than 200 m (Steiner &amp; Kabat 2004). Additionally, we examined the material from Scarabino (1973) and Penna&shy;Neme (1974) studies, which prooved to be misidentified specimens. Recently, Scarabino (2003) stated that &lt;i&gt;G. perlonga&lt;/i&gt; records from off Argentina were obviously due to a mistake in the station number, as suspected previously by Henderson (1920), who added a question mark to this record. Thus, we conclude that the southernmost geographical distribution limit for this species is off Rio de Janeiro, Brazil.&lt;/p&gt;Published as part of &lt;i&gt;Caetano, Carlos Henrique Soares, Scarabino, Victor &amp; Absalão, Ricardo Silva, 2006, Scaphopoda (Mollusca) from the Brazilian continental shelf and upper slope (13 º to 21 ºS) with descriptions of two new species of the genus Cadulus Philippi, 1844, pp. 1-47 in Zootaxa 1267&lt;/i&gt; on pages 20-21, DOI: &lt;a href="http://zenodo.org/record/173183"&gt;10.5281/zenodo.173183&lt;/a&gt

Gadila pocula Dall 1889, n.comb

&lt;i&gt;Gadila pocula&lt;/i&gt; (Dall, 1889) n.comb &lt;p&gt;Figs. 84&ndash;85&lt;/p&gt; &lt;p&gt; + &lt;i&gt;Cadulus poculum&lt;/i&gt; Dall 1889: 429; Abbott 1974: 390.&lt;/p&gt; &lt;p&gt; + &lt;i&gt;Cadulus (Gadila) poculum&lt;/i&gt;: Pilsbry and Sharp 1898: 172, pl. 33, figs. 56, 57. + &lt;i&gt;Cadulus (Platyschides) poculum&lt;/i&gt;: Henderson 1920: 108, pl. 17, fig. 8. + &lt;i&gt;Polyschides poculum&lt;/i&gt;: Steiner and Kabat 2001: 448; 2004: 631.&lt;/p&gt; &lt;p&gt; &lt;i&gt;Type material&lt;/i&gt;&lt;/p&gt; &lt;p&gt;Lectotype USNM 95374 (designated by Henderson, 1920: 109); Paralectotypes USNM 887461, 1 dd, MCZ 7743, 1 dd.&lt;/p&gt; &lt;p&gt; &lt;i&gt;Type locality&lt;/i&gt;&lt;/p&gt; &lt;p&gt; off st. Vincent, West Indies, &lt;i&gt;Blake&lt;/i&gt; sta 226, 13 &ordm;09&rsquo;05&quot;N, 61&ordm;16&rsquo;20&quot;W, 774 m (by subsequent designation).&lt;/p&gt; &lt;p&gt; &lt;i&gt;Diagnosis&lt;/i&gt;&lt;/p&gt; &lt;p&gt;Shell medium size (to 11mm), slender, strongly curved posteriorly, solid, brilliant. E quator located at first forth, more notorious at ventral side where it is obtuse angled. Apex simple or with two flat lateral lobes, denticle&shy;like structure at ventral edge. Pre&shy;apical callous thick, lumen oval. Apical section dorsoventrally depressed; oral aperture oblique, strongly dorsoventrally depressed.&lt;/p&gt; &lt;p&gt; &lt;i&gt;Material examined&lt;/i&gt;&lt;/p&gt; &lt;p&gt;IBUFRJ 14312, off Bacia de Campos, Rio de Janeiro, 22&ordm;26&rsquo;28&quot;S, 39&ordm;58&rsquo;53&quot;W, 1050 m, 1 dd.&lt;/p&gt; &lt;p&gt; &lt;i&gt;Distribution&lt;/i&gt;&lt;/p&gt; &lt;p&gt;off St. Vincent (Dall 1889); off Yucatan bank (Henderson 1920); Brazil: Rio de Janeiro (this study). Shells 774 to 1173 m (Henderson 1920; this study).&lt;/p&gt; &lt;p&gt; &lt;i&gt;Remarks&lt;/i&gt;&lt;/p&gt; &lt;p&gt; Steiner and Kabat (2001, 2004) placed this species at the genus &lt;i&gt;Polyschides&lt;/i&gt; because of the position of the maximum diameter at anterior third of the shell, occurrence of apical lateral projections that, according to these authors, indicate four apical lobes, and the strongly oblique anterior aperture. Acccording to Steiner and Kabat (2004) this species could also be placed in &lt;i&gt;Gadila&lt;/i&gt;. The specimen studied is well preserved and the carefull examination of the apical features shows only two lateral flat lobes and none ventral or dorsal projections. In this manner, we concluded that the studied species fits better to the concept of genus &lt;i&gt;Gadila&lt;/i&gt; than &lt;i&gt;Polyschides&lt;/i&gt;.&lt;/p&gt;Published as part of &lt;i&gt;Caetano, Carlos Henrique Soares, Scarabino, Victor &amp; Absalão, Ricardo Silva, 2006, Scaphopoda (Mollusca) from the Brazilian continental shelf and upper slope (13 º to 21 ºS) with descriptions of two new species of the genus Cadulus Philippi, 1844, pp. 1-47 in Zootaxa 1267&lt;/i&gt; on pages 41-42, DOI: &lt;a href="http://zenodo.org/record/173183"&gt;10.5281/zenodo.173183&lt;/a&gt