Additions to the hydroids (Cnidaria: Hydrozoa) from the fjords region of southern Chile

Abstract

This report considers five species of hydroids collected during a scientific expedition to the Northern Patagonian Zone of Chile in March 2007. Two poorly known species, Halecium fraseri Ralph, 1958 (Haleciidae) and Thuiaria polycarpa Kirchenpauer, 1884 (Sertulariidae), are redescribed from new, fertile material. The genus Parathuiaria Leloup, 1974 is assigned to the synonymy of Thuiaria Fleming, 1828, and notes are provided on the taxonomy of its type species, T. polycarpa. Three other hydroid species, Halecium tenellum Hincks, 1861 (Haleciidae), Amphisbetia operculata (Linnaeus, 1758) (Sertulariidae), and an athecate hydroid tentatively assigned to the genus Turritopsis McCrady, 1857 (Oceaniidae), are mentioned and accompanied by figures and brief remarks.

On the benthic hydroids from the Scotia Arc (Southern Ocean): new insights into their biodiversity, ecology and biogeography

“…Furthermore, our material perfectly matches the measurements given by El Beshbeeshy and Jarms (2011), unlike those by Galea (2007), who found specimens with larger hydrothecae than those from the original description and the material described here (see Table 2). For these reasons, we consider Galea's (2007) Remarks The present specimens, as well the material studied by Galea (2007), coincide with data from the original description by El Beshbeeshy and Jarms (2011) (see Table 3). …”

“…However, as El Beshbeeshy and Jarms (2011) stated, Sertularella argentinica forms bush-like colonies, with monosiphonic stems, coinciding with the specimens found in the present study, but differing from the material described by Galea (2007), which forms erect and polysiphonic colonies. Furthermore, our material perfectly matches the measurements given by El Beshbeeshy and Jarms (2011), unlike those by Galea (2007), who found specimens with larger hydrothecae than those from the original description and the material described here (see Table 2). For these reasons, we consider Galea's (2007) Remarks The present specimens, as well the material studied by Galea (2007), coincide with data from the original description by El Beshbeeshy and Jarms (2011) (see Table 3).…”

“…Remarks Since the original description, Sertularella argentinica has been found only once, off the Chilean Patagonian Coast (Galea 2007). However, as El Beshbeeshy and Jarms (2011) stated, Sertularella argentinica forms bush-like colonies, with monosiphonic stems, coinciding with the specimens found in the present study, but differing from the material described by Galea (2007), which forms erect and polysiphonic colonies.…”

“…It can be considered as a Patagonian species with a tendency to enter Antarctic waters via the Scotia Arc. Ecology and distribution Reported in Patagonian waters at depths from 40 to 520 m (El Beshbeeshy and Jarms 2011); present material from 277 to 309 m. Species with a wide distribution, previously reported from Patagonian waters (Leloup 1974;Galea 2007; El Beshbeeshy and Jarms 2011) and Burdwood Bank (El Beshbeeshy and Jarms 2011; present study). This study constitutes the first evidence from the South Sandwich Islands and, as a result, from Antarctic waters.…”

“…Ecology and distribution Reported at depths from 32 (Galea 2007) to 620 m (El Beshbeeshy and Jarms 2011); present (Galea 2007), and off the Argentinean Patagonian coast (El Beshbeeshy and Jarms 2011). This is the third record for the species and constitutes the first evidence of its presence in Antarctic waters, having been collected from the the South Sandwich Islands and South Shetland Islands.…”