Filellum, Hincks, 1868

Soto, Joan J. & Peña, Álvaro L., 2019, Benthic hydroids (Cnidaria, Hydrozoa) from the Weddell Sea (Antarctica), Zootaxa 4570 (1), pp. 1-78 : 22-23

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.