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.