Consulta: subjectFacets:"Littorinidae"
Registros recuperados: 3
Data/hora: 01/06/2024 18:11:58

One Case of Triphallia in the Marine Snail Echinolittorina peruviana (Caenogastropoda: Littorinidae)
Provedor de dados: International Journal of Morphology
Autores: Castillo,Viviana M; Brown,Donald I.
Gonochoric representatives of Littorinidae have a reproductive system organized with transit organs that connects the testicle with a penis specialized for internal fertilization. However, malformations at this level can produce, like triphallia (presence of triple penis). This description corresponds to one case of triphallia found in Echinolittorina peruviana (Lamarck, 1822) inhabitant of the South Pacific coasts. The macro and microscopic analysis reveals that every penis is an independent appendix whose individual morphology is similar to that in normal individuals, characterized by a non pigmented conic penis associated with a mammilliform gland located at the base of the right ocular tentacle. The cervical sperm groove lined by a simple ciliated and...
Tipo: Journal article
Palavras-chave: Mollusk; Reproduction; Reproductive system; Penial morphology; Malformation; Littorinidae.
Ano: 2012
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-95022012000300003

Microscopic Anatomy of the Male Reproductive System in Echinolittorina peruviana (Mollusca: Caenogastropoda)
Provedor de dados: International Journal of Morphology
Autores: Castillo,Viviana M; Brown,Donald I.
Echinolittorina peruviana (Lamarck, 1822), a gonochoric representative of the Littorinidae on the SE Pacific coast, has a male reproductive system adapted for internal fertilization. We describe this system at both macro- and microscopic levéis, particularly the compartmentalized organization of the gonad, and the morphology of the penis. The male reproductive system has a variegated conical gonad-digestive gland complex. The gonad presents three compartments, 1) gametogenic acinar among the glandular acini, 2) periacinar with a layer of fusiform somatic cells and, 3) interacinar with glycogen storage cells shared with glandular acini. Spermatogenesis occurs within the acinar gametogenic compartment, with the germinal line organized in centripetal form...
Tipo: Journal article
Palavras-chave: Mollusca; Microscopic anatomy; Male reproductive system; Littorinidae.
Ano: 2008
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-95022008000200030

Periwinkle (Gastropoda: Littorinidae) habitat selection and its impact upon microalgal populations
Provedor de dados: Brazilian Journal of Biology
Autores: APOLINÁRIO,M.; COUTINHO,R.; BAETA-NEVES,M. H.
The present study examines habitat selection and grazing pressure of the periwinkle Nodilittorina lineolata (Gmelin, 1791) on the rocky shore of Arraial do Cabo, RJ, Brazil (lat. 23°S, long. 43°W). Transfer experiments suggest that periwinkles actively select the mid intertidal, where the cirripede Chthamalus bisinuatus Pilsbry is the dominant sessile invertebrate. We also conducted a caging experiment in the middle intertidal, manipulating grazers and light, to assess the impact of grazing upon microalgal density. Grazing pressure significantly reduced microalgal abundance at the mid-intertidal level, suggesting that food availability plays an important role in the habitat selection of periwinkles on the studied shore.
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Brazil; Habitat selection; Intertidal; Littorinidae; Microalgae.
Ano: 1999
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0034-71081999000200005