Leptosynapta brasiliensis: a new species of synaptid holothurian (Echinodermata) from a sandy beach in southeastern Brazil

Freire, Carolina A.; Grohmann, P

doi:10.1590/s0101-81751989000400018

Cited by 11 publications

(4 citation statements)

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“…Absence of urns in the macrofaunal L. buskii remains unexplained. In Leptosynapta brasiliensis , which Freire and Grohmann () liken to L. minuta and R. ruber , only 6–12 urns are present.…”

Section: Discussionmentioning

confidence: 99%

Development and morphology of ciliary urns in the sea cucumber Synaptula hydriformis (Echinodermata: Holothuroidea)

Curtis

Turner

2019

Invertebrate Biology

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Sea cucumbers (holothuroids) lack the only known echinoderm immune organ, the axial organ. Holothuroids of the families Synaptidae and Chiridotidae have coelomic organs, known as ciliary urns, that gather and excrete waste and, therefore, might function in immunity. Although ciliary urns are widely reported and illustrated in the literature, the process and histology of urn development remain unknown. Development and structure of ciliary urns were examined in Synaptula hydriformis using scanning electron, brightfield, and scanning laser confocal microscopy. Mature urns occurred on all three mesenteries in 10‐tentacled young and later growth stages, and developing urns were found in post‐pentactulae, 10‐tentacled young, and released juveniles. Developing urns were circular clusters of ciliated collar cells protruding from the mesentery. The cells increased in number to form the sessile cushion stage with a shallow lumen. The subsequent spoon‐shaped stage had a stalk and a deepened lumen with an extensive ciliary field where coelomocytes began to accumulate. Mature urns had a thin stalk and cornucopia‐shaped body with an abluminal epithelium of squamous cells and an adluminal epithelium of densely packed ciliated collar cells. Cell boundaries of the rim of mature urns and of the stalk and body of developing urns were outlined on one or both sides by microvilli and an elevated cell membrane. Ciliary urns resembling the cushion‐stage urns of S. hydriformis have been described in the sea star Archaster typicus. If urns in these groups are homologous, it is likely that cushion urns are plesiomorphic and that they are present and have been overlooked in other echinoderms.

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Section: Discussionmentioning

confidence: 99%

Development and morphology of ciliary urns in the sea cucumber Synaptula hydriformis (Echinodermata: Holothuroidea)

Curtis

Turner

2019

Invertebrate Biology

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“…Remarks. To date, seven Synaptidae occurs at the South Atlantic, Epitomapta roseola (Verrill, 1874), Euapta lappa (Müller, 1850), Protankyra benedeni (Ludwig, 1881), Protankyra ramiurna Heding, 1928, Synaptula hydriformis (Lesueur, 1824), Synaptula secreta Ancona-Lopez, 1957, and Yemoja brasiliensis (Freire and Grohmann, 1989). Synaptidae sp.1 Figure 2c and d Description.…”

Section: Family Synaptidaementioning

confidence: 99%

Disarticulated ossicles of sea cucumbers from the Campos Basin, Brazil: A new perspective into the discovery of diversity of Holothuroidea (Echinodermata)

Martins,

Costa,

Toledo

2023

The Holocene

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The study of disarticulated ossicles of recent sea cucumbers from Campos Basin, Rio de Janeiro, Brazil, from various Holocene strata, obtained by micropaleontological methods, resulted in the identification of at least eight holothurian taxa, belonging to the five of the seven orders of Holothuroidea: Apodida (Synaptidae, Chiridotidae), Dendrochirotida (Psolidae and Cucumariidae), Holothuriida ( Holothuria), and Molpadiida (Molpadiidae, Eupyrgidae). Our paper endorses the importance of studies of recent fauna based on isolated ossicles for taxonomy, biostratigraphy, and ecology. This study represents the first effort at the study of recent fauna of sea cucumbers based on the analysis of preserved ossicles in marine sediments.

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“…Remarks: Based on the examinations of the type material Martins & Souto (2020) described a new genus to allocate the species Leptosynapta brasiliensis. The monotypic genus includes the species Yemoja brasiliensis (Freire & Grohmann, 1989). .…”

Section: Psolus Tommasi Martins and Tavares 2019 Fig 3dmentioning

confidence: 99%

An annotated catalogue of Echinodermata types in the Museu de Zoologia, Universidade de São Paulo, Brazil

et al. 2022

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Leptosynapta brasiliensis: a new species of synaptid holothurian (Echinodermata) from a sandy beach in southeastern Brazil

Abstract: A new species of synaptid holothurian, Leptosynapta brasiliensis n. sp., is described. The species shows affinities with Leptosynapta minuta (BECHER, 1906)

Cited by 11 publications

References 1 publication

Development and morphology of ciliary urns in the sea cucumber Synaptula hydriformis (Echinodermata: Holothuroidea)

Development and morphology of ciliary urns in the sea cucumber Synaptula hydriformis (Echinodermata: Holothuroidea)

Disarticulated ossicles of sea cucumbers from the Campos Basin, Brazil: A new perspective into the discovery of diversity of Holothuroidea (Echinodermata)

An annotated catalogue of Echinodermata types in the Museu de Zoologia, Universidade de São Paulo, Brazil

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