The Functional Morphology of the British Species of Veneracea (Eulamellibranchia)

Ansell, A. D.

doi:10.1017/s0025315400024012

Cited by 71 publications

(51 citation statements)

References 18 publications

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“…Siphon diamcters for several bivalves were measured in the USGS laboratory to aid us in developing the model (Table 1). The ratio of incurrent to excurrent diameters (2 : 1) is common in siphonate bivalves (Ansell 1961;Yonge 1946) and was seen in all sizes of T. Only three studies have measured excurrent jet velocities in bivalves. The jet velocity we used is comparable to that measured by Ertman and Jumars (1988) for the cockle Clinocardium nuttallii (9-l 1 cm s '…”

Section: Experimental Methodsmentioning

confidence: 99%

A study of model bivalve siphonal currents

Monismith

Koseff

Thompson

et al. 1990

Limnology & Oceanography

118

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We carried out experiments studying the hydrodynamics of bivalve siphonal currents in a laboratory flume. Rather than USC living animals, we devised a simple, model siphon pair connected to a pump. Fluorescence-based flow visualization was used to characterize siphon-jet flows for several geometric configurations and flow speeds. These measurements show that the boundarylayer velocity profile, siphon height, siphon pair orientation, and size of siphon structure all affect the vertical distribution of the excurrent flow downstream of the siphon pair and the fraction of cxcurrent that is refiltered. 'The observed flows may effect both the clearance rate of an entire population of siphonate bivalves as well as the efficiency of feeding of any individual. Our results imply that field conditions arc properly represented in laboratory flume studies of phytoplankton biomass losses to benthic bivalves when the shear velocity and bottom roughness are matched to values found in the field. Numerical models of feeding by a bivalve population should include an effcctivc sink distribution which is created by the combined incurrent-excurrcnt flow field. Nearbed flows need to be accounted for to properly represent these benthic-pelagic exchanges. We also present velocity measurements made with a laser-Doppler anemometer (LDA) for a single configuration (siphons flush with bed, inlet downstream) that show that the siphonal currents have a significant local effect on the properties of a turbulent boundary layer.

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Section: Experimental Methodsmentioning

confidence: 99%

A study of model bivalve siphonal currents

Monismith

Koseff

Thompson

et al. 1990

Limnology & Oceanography

118

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“…Donax gemmula apresenta nas margens livres do manto o padrão básico de três pregas, como descrito por YONGE (1948,1957,1982,1983) para os Bivalvia em geral. Entretanto, a prega mediana é duplicada, como ilustrado por NARCHI (1974NARCHI ( , 1978 em D. hanleyanus, resultando na presença de quatro cristas longitudinais, padrão esse observado em muitos Veneridae (ANSELL 1961, NARCHI 1972b, NARCHI & GABRIELI 1980, GUERÓN & NARCHI 2000, NARCHI & DARIO 2002. As cristas externa e interna resultantes da duplicação da prega mediana em D. trunculus, foram denominadas por MOUËZA & FRENKIEL (1974) de prega "mediana" e "interna", respectivamente, sendo a quarta prega presente nessa espécie identificada nesse artigo como "velum", a qual funde-se à sua correspondente do lado oposto para originar os sifões e o músculo cruciforme.…”

Section: Trato Digestivounclassified

Biologia e anatomia funcional de Donax gemmula Morrison (Bivalvia, Donacidae) do litoral de São Paulo, Brasil

Passos

Domaneschi

2004

Rev. Bras. Zool.

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. Donax gemmula Morrison, 1971 is a small bivalve occurring on sandy beaches throughout the Southeastern Brazilian coast to Uruguai. Live specimens were collected from Barequeçaba Beach, São Sebastião, State of São Paulo, Brazil. The animal's behaviour was recorded in situ as well as in aquaria, and its functional morphology registered from specimens dissected under stereomicroscope; details of the anatomy were obtained from histological sections. The minute, smooth subglobose shell, and the large, muscular foot provided with a pair of well-developed elevator muscles allow fast burrowing, vital in the disturbed beach environment where the species lives. A vestigial byssal apparatus is present from juvenile through the adult form and this free-living infaunal donacid does not migrate following the rising and ebbing tides. The mantle margins have the middle fold duplicated; besides captate tentacles, the middle folds bear long, filiform, sensory tentacles, the latter restricted to the rear end of the animal. The presence of complete, large, homorhabdic ctenidia; small but very selective labial palps; short and few convoluted intestine, separated from the style sac; and straining tentacles encircling the inhalant aperture reveal the selective suspension feeding habit of the species. KEY WORDS. Mollusca, sandy beaches, selective suspension feeding, Southwestern Atlantic. Morrison, 1971 ocorre em praias arenosas da costa sudeste-sul do Brasil até o Uruguai. Espécimes foram coletados na Praia de Barequeçaba, São Sebastião, Estado de São Paulo, Brasil. O comportamento do animal foi registrado "in situ" e em aquários e a morfologia funcional a partir de espécimes dissecados sob estereomicroscópio; detalhes da anatomia foram obtidos a partir de cortes histológicos. A concha pequena, lisa, subglobosa, e o pé grande, muscular, provido de um par de músculos elevadores bem desenvolvidos, permitem escavação rápida, vital em praias sujeitas à intensa ação de ondas onde a espécie vive. Aparato bissal vestigial ocorre desde a fase juvenil à adulta e este donacídeo de vida livre, infaunal, não migra acompanhando o ritmo das marés. As margens do manto possuem prega mediana duplicada; além de tentáculos captados, as pregas medianas possuem tentáculos sensoriais filiformes, longos, estes últimos restritos à região posterior do animal. A espécie tem hábito alimentar suspensívoro seletivo, o qual é revelado pela presença de ctenídios grandes, completos e homorhábdicos, palpos labiais pequenos e muito seletivos, intestino curto, fracamente sinuoso, separado do saco do estilete cristalino, e tentáculos ramificados formando um crivo em torno da abertura inalante. PALAVRAS CHAVE. Atlântico sudoeste, Mollusca, praias arenosas, suspensívoro seletivo. RESUMO. Donax gemmula

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“…A atividade muscular das pregas de P. perna, separando-as ou aproximando-as, já foram evidenciadas por KELLOGG (1915), ANSELL (1961), NARCHI (I 974a), HEBLING (1976), AVELAR & NARCHI (1984) e NARCHI & GALVÃo-BuENO (1983) em outros bivalves. Teve-se a oportunidade de observar também a atividade muscular do próprio palpo.…”

Section: Palpos Labiaisunclassified

Anatomia funcional de Perna perna (Linné) (bivalvia, Mytilidae)

Narchi

Galvão-Bueno

1997

Rev. Bras. Zool.

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ABSTRACT. FUNCTIONAL ANATOMY OF PERNA PERNA (LINNÉ) (BIVAlVIA, MVTlllDAE). Perna perna (Linné, 1758) occurs on the Atlantic littoral from Venezuela to Uruguay. The main organ systems were studied in lhe living animais, particular attention being paid to lhe ciliary feeding and c1eansing mechanisms in lhe mantle cavity. The anatomy, functioning oflhe stomach and the ciliary sorting mechanisms are described. The siphons belong to type A(YONGE J948b), the ctenidia to type B(I)(ATI

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The Functional Morphology of the British Species of Veneracea (Eulamellibranchia)

Cited by 71 publications

References 18 publications

A study of model bivalve siphonal currents

A study of model bivalve siphonal currents

Biologia e anatomia funcional de Donax gemmula Morrison (Bivalvia, Donacidae) do litoral de São Paulo, Brasil

Anatomia funcional de Perna perna (Linné) (bivalvia, Mytilidae)

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