Nuevo registro de Scalpellum projectum (Crustacea: Cirripedia: Thoracica: Scalpellidae) para el talud continental de Chile

Abstract

RESUMEN. El cirripedio pedunculado Scalpellum projectum Nilsson-Cantell, 1930, fue descrito sobre la base de material bentónico adosado a un cable telegráfico recuperado de aguas profundas frente a Antofagasta (~23ºS). Desde su descripción original no existen nuevos reportes para dicha especie a nivel mundial. En recientes prospecciones relacionadas con el estudio de comunidades asociadas a filtraciones de metano se recolectaron seis hembras adultas de S. projectum. Este material procede de tres estaciones ubicadas entre 34º42' y 36º22'S, a profundidades de 846 a 922 m. Se entregan datos taxonómicos, basados en la morfología externa de los ejemplares, cuyos tamaños coinciden, en términos generales, con la descripción original. No se encontraron ejemplares machos, los que son de muy reducido tamaño, de forma aberrante y viven al interior de los scuta en el capítulum de las hembras. Con este segundo hallazgo se extiende, en aproximadamente 17º de latitud (1.800 km) hacia el sur su distribución geográfica y en 200 m su distribución batimétrica, la cual hasta ahora ha sido reportada solamente para el talud continental de Chile. Palabras clave: cirripedios, talud continental, afloramientos de metano, Scalpellum, Scalpellidae, Chile.New record of Scalpellum projectum (Crustacea: Cirripedia: Thoracica: Scalpellidae) for the continental slope of Chile ABSTRACT. The pedunculate barnacle Scalpellum projectum Nilsson-Cantell, 1930, was described based on benthic material from a telegraph cable recovered from deep waters off Antofagasta (~23ºS). No new records have been reported for this species worldwide since its original description. Six adult females of S. projectum were collected during recent studies of communities associated with methane seeps. The material was taken from three stations located between 34º42' and 36º22'S and at depths of 846 to 922 m. We provide taxonomic information based on the external morphology of the specimens, whose sizes coincide in general terms with those of the original description. No male specimens were observed; these are smaller, aberrant in form, and live within the scuta in the capitulum of the females. With this second finding, the distributional range of this species, previously only reported for the slope off Chile, is extended about 17º latitude southwards (1,800 km) and its bathymetric range is expanded by 200 m.

Trophic structure of the bathyal benthos at an area with evidence of methane seep activity off southern Chile (~45°S)

“…New records of species have been also established (e.g. Baez & Sellanes, 2009; Guzman et al ., 2009). However, the knowledge about benthic communities living in the deep-sea environment is still quite limited.…”

Crustaceans in Cold Seep Ecosystems: Fossil Record, Geographic Distribution, Taxonomic Composition, and Biology

“…Non-parasitic taxa from the Pacific are dominated by the stalked barnacles from the scalpelliform Eolepadidae family (Neolepadinae subfamily) and include Ashinkailepas kermadecensis from New Zealand (Buckeridge, 2009); Ashinkailepas seepiophila from Japan (Fujikura et al 2002;Yamaguchi et al 2004); Leucolepas longa from Papua New Guinea (Southward et al 2002;Southward and Jones 2003;Stecher et al 2003); Vulcanolepas parensis from the Pacific-Antarctic Ridge (Southward, 2005); and possibly Vulcanolepas osheai found near New Zealand (Buckeridge 2000;Southward 2005). Other Pacific records include rare occurrences of the scalpelliforms Arcoscalpellum sp., Scalpellum projectum, Scalpellum sp., and an unidentified scalpellid from Chile (Sellanes et al 2008;Báez and Sellanes 2009;Zapata-Hernández et al 2014). The latter authors also noted the presence of the lepadiform Lepas sp.…”