Halecium interpolatum Ritchie, 1907

Soto, Joan J. & Peña, Álvaro L., 2019, Benthic hydroids (Cnidaria, Hydrozoa) from the Weddell Sea (Antarctica), Zootaxa 4570 (1), pp. 1-78 : 40

Halecium interpolatum Ritchie, 1907

( Fig. 13h )

Material examined. ANT XV/3: 48-5, few stems, up to 2 mm high, on sponge; 48-27, few stems, up to 2 mm high, on Sy. glacialis ; 48-31, few stems, up to 5 mm high, on O. terranovae ; 48-33, few stems, up to 10 mm high, on O. terranovae ; 48-34, few stems, up to 8 mm high, on O. terranovae ; 48-36, several stems, up to 25 mm high, on O. terranovae , with male gonothecae; 48-77, some stems, up to 15 mm high, on St. polarsterni ; 48-150, few stems, up to 10 mm high, on E. scotti and St. polarsterni ; 48-220, numerous stems, up to 60 mm high, on Sc. nana , Sy. anae , Sy. exochus , Sy. naumovi , with gonothecae; 48-222, few stems, up to 2 mm high, on Sc. nana ; 48-276, some stems, up to 10 mm high, on Sc. nana ; ANT XVII/3: 111-5, several stems, up to 30 mm high, on O. terranovae and polychaete tube, with gonothecae; 111-7, several stems, up to 20 mm high, on O. terranovae ; 111-9, numerous stems, up to 40 mm high, on polychaete tube, H. arboreum , O. terranovae and T. longstaffi , with gonothecae; 111- 18, several stems, up to 20 mm high, on O. terranovae and Sc. nana , with gonothecae; 111-19, several stems, up to 20 mm high, on Sy. weddelli and Tubularia sp.1, with gonothecae; ANT XXI/2: PS65/39, several stems, up to 30 mm high, on C. hicksoni , Sc. nana , Sy. exochus and Sy. plectilis , with gonothecae; PS65/121, few stems, up to 3 mm high, on S. lobata ; PS65/248, few stems, up to 2 mm high, on Sy. curvatus and Sy. plectilis ; PS65/253, some stems, up to 10 mm high, on St. polarsterni ; PS65/265, some stems, up to 15 mm high, on St. polarsterni and H. pseudodelicatulum ; PS65/276, one colony, c. 15 mm high; PS65/278, several stems, up to 20 mm high, on O. terranovae , L. dumosa and Sy. weddelli ; PS65/281, few stems, up to 3 mm high, on O. terranovae and Sy. cumberlandicus .

Ecology and distribution. Reported from three ( Stepanjants 1979, as Halecium ovatum ) to 728 m ( Peña Cantero 2014a); examined material from 62 to 758 m. Circum-Antarctic species ( Peña Cantero 2014b), reported here for the Weddell Sea for the first time.

Figures

FIGURE 13. a Halecium cf. antarcticum: hydrophore and hydrotheca. b–d H. banzare: b hydrophore and hydrotheca; c male gonotheca; d colony. e H. exaggeratum: hydrophore and hydrotheca. f–g H. incertus: f hydrophore and hydrotheca; g gonotheca. h H. interpolatum: hydrophore and hydrotheca. i H. jaederholmi: hydrophore and hydrotheca. j–k H. pseudodelicatulum: j hydrophore and hydrotheca; k female gonotheca. l H. pseudoincertus: hydrophore and hydrotheca.