Filellum sp.

Material examined. ANT XV/3: 48-4, some hydrothecae, on E. generale; 48-5, some hydrothecae, on sponge; 48- 27, numerous hydrothecae, on E. generale, Halecium exaggeratum Peña Cantero, Boero & Piraino, 2013 and S. lobata; 48-44, several hydrothecae, on Halecium banzare Watson, 2008, S. lobata and Sy. exochus; 48-50, several hydrothecae, on C. hicksoni and Sc. nana; 48-77, numerous hydrothecae, on Halecium jaederholmi Vervoort, 1972; 48-168, some hydrothecae, on Sy. exochus; 48-194, numerous hydrothecae, on Sc. nana; 48-220, some hydrothecae, on C. hicksoni, H. interpolatum and Symplectoscyphus liouvillei (Billard, 1914); 48-222, numerous hydrothecae, on Sc. nana and Sy. weddelli; 48-223, numerous hydrothecae, on Sc. nana and Symplectoscyphus plectilis (Hickson & Gravely, 1907); 48-276, some hydrothecae, on Halecium cf. antarcticum and Sy. weddelli; ANT XVII /3: 111-9, few hydrothecae, on R. antarcticum; 111-19, numerous hydrothecae, on H. interpolatum, L. dumosa, R. antarcticum, Sc. unifurcata, Sy. exochus, Symplectoscyphus naumovi Blanco, 1969 and Sy. weddelli; ANT XXI /2: PS65/39, numerous hydrothecae, on C. hicksoni, Sc. nana, St. glomulosa, S. lobata, Sy. exochus, Sy. glacialis and Sy. plectilis; PS65/121, numerous hydrothecae, on Sy. glacialis, Sy. plectilis and the hydrorhiza of an undetermined hydroid; PS65/132, numerous hydrothecae, on O. erratum; PS65/166, several hydrothecae, on Sy. exochus; PS65/174, several hydrothecae, on Sy. exochus; PS65/175, numerous hydrothecae, on S. lobata and Sy. naumovi; PS65/237, several hydrothecae, on Sy. exochus, Sy. glacialis and Sy. weddelli; PS65/248, numerous hydrothecae, on H. incertus, Sy. curvatus, Sy. glacialis, Sy. plectilis and octocoral; PS65/253, several hydrothecae, on S. lobata; PS65/265, several hydrothecae, on Sy. glacialis; PS65/274, some hydrothecae, on St. nonscripta and Sy. plectilis; PS65/276, several hydrotheca on Sy. exochus and Sy. vanhoeffeni; PS65/278, several hydrothecae, on H. secundum, L. dumosa and sponge; PS65/292, numerous hydrothecae, on Staurotheca antarctica Hartlaub, 1904 and St. nonscripta.

Remarks. Material included here comprises a huge amount of small-sized hydrothecae, with 100-150 µm in diameter of aperture, and provided with striae. The material could correspond, at least in part, to F. antarcticum. However, in agreement with Peña Cantero et al. (2004) and Marques et al. (2011), the small-sized Filellum from Antarctic waters are not identifiable in the absence of coppinia, and therefore it precludes a proper identification of material examined here.

Ecology and distribution. Material examined was collected at depths between 62 and 598 m.