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Malacoceros longiseta, a new species of Spionidae (Annelida: Polychaeta) from Venezuela

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Abstract

Several specimens of polychaetes were collected on a sandy beach at depths of 0–1 m in the northeastern Venezuelan using a PVC corer (0.018 m2), taking sediment cores of 20 cm depth. Samples were sieved using a 0.5-mm open mesh. Specimens were fixed in 10 % formaldehyde and preserved and stored in 70 % ethanol. They were then examined using compound microscopes, and structures with taxonomic value were dissected. The characteristics of the specimens examined allowed to identify them as belonging to the genus Malacoceros. A new species of spionid polychaete is described from the Caribbean Sea, Malacoceros longiseta n. sp. This species clearly differs from all other species of Malacoceros Quatrafages (Mag Zool Paris 2:1–16, 1843), by the presence of lateral subterminal prostomial horns, extremely long notopodial capillary chaetae on the three first chaetigers (similar to the ones observed for Dispio uncinata Hartman), the length of the branchiae in relation to the notopodial lamellae, and the morphology of the pygidium.

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Acknowledgments

This study was generously supported by the División de Ciencias e Ingeniería of the Universidad de Quintana Roo, México and the Instituto Oceanográfico de Venezuela, Consejo de Investigación- Universidad de Oriente. Thanks to MSc. José María Moreno who collected the examined material, to Linda Ward by helped us with old references and for the comments of two anonymous referees which greatly improved the quality of the manuscript.

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Authors and Affiliations

  1. Departamento de Ingeniería, División de Ciencias e Ingeniería, Universidad de Quintana Roo, Boulevard Bahía s/n, Esq. Ignacio Comfort, Col. del Bosque, C. P. 77019, Chetumal, Quintana Roo, México

    V. Hugo Delgado-Blas

  2. Instituto Oceanográfico de Venezuela, Universidad de Oriente, Cumaná, Sucre, Venezuela

    Óscar Díaz-Díaz

Authors
  1. V. Hugo Delgado-Blas
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  2. Óscar Díaz-Díaz
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Correspondence to V. Hugo Delgado-Blas.

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Delgado-Blas, V.H., Díaz-Díaz, Ó. Malacoceros longiseta, a new species of Spionidae (Annelida: Polychaeta) from Venezuela. Mar Biodiv 43, 181–187 (2013). https://doi.org/10.1007/s12526-013-0144-9

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  • DOI: https://doi.org/10.1007/s12526-013-0144-9

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