Diferencias morfométricas de dos especies del género Eatoniella en Isla Navarino, Reserva de Biosfera Cabo de Hornos, Chile

Abstract

The external morphometrics of shell and radula morphology were performed in two species of micromollusks of the genus Eatoniella in Navarino Island, Chile. A total of 50 specimens of E. picea and 72 of E. nigra were analyzed. These species have similar morphology, but E. picea has a smaller diameter/length ratio (0.53 ± 0.02) than E. nigra (0.61 ± 0.04). In relation to the radula morphology, E. picea has wider middle cuspid teeth and small denticles in its border, meanwhile E. nigra has pointed central cuspid teeth.

Diversity of benthic marine mollusks of the Strait of Magellan, Chile (Polyplacophora, Gastropoda, Bivalvia): a historical review of natural history

“…Finally, there are species in the list that do not qualify as doubtful, but which have been classified as unknown species due to their low number of records or due to its small body size, which makes it difficult to identify the species, with poor ecological or descriptive information ( Castellanos 1979 ; Geiger 2012 ; Rosenfeld et al 2017 ), e.g., Notoplax magellanica , Lissotesta impervia , Onoba sulcula , Onoba georgiana , Microglyphis curtula , Cylichna gelida , Turbonilla sanmatiensis , Philobrya atlantica . In this sense, it should be noted that much of the mollusk information that was collected in this work comes from manual collections and various types of sampling gears, trawl and grabs (e.g., Watson 1886 ; Rochebrune and Mabille 1889 ; Strebel 1907 ; Linse 2002 ; Ríos et al 2003 ).…”

First catalogue of benthic marine macroalgae from glacier-influenced environments of the Beagle Channel, deposited in the new Sub-Antarctic Cryptogamic Herbarium (SCH) of the University of Magallanes

“…Entre las características geomorfológicas presentes en la RBCH que se reflejan en la heterogeneidad ambiental y posibilitan las características biológicas (adaptación de las especies a los distintos ambientes), destacan sus costas con diferentes orientaciones, regímenes de marea, corrientes y grados de exposición al oleaje, sometidas a importantes variaciones oceanográficas (e.g. nutrientes, turbidez, temperatura y salinidad), tipos de sustratos que van desde fondos blandos, playas de arena, guijarros, bolones y terrazas (Ojeda et al 2019;Rosenfeld & Ojeda, 2015;Rosenfeld et al 2017). Estas condiciones generan en las comunidades de macroalgas variados patrones ecológicos que sustentan una singular biodiversidad caracterizada por sus capacidades adaptativas y su grado de endemismo (Mansilla et al 2013;Mansilla et al 2020;Marambio et al 2020).…”