Analysis of information sources in references of the Wikipedia article "Spirula spirula" in Portuguese language version.
The shell is sufficiently strong to withstand the hydrostatic pressure of the sea at the depths at which the animal lives.
Ejemplar de Spirula spirula localizado en la Playa de Afife (Viana do Castelo, Portugal) en agosto de 2012.
ZOOL. Concha de molusco cefalópode dividida em câmaras por septos transversais.