Abietinella operculata ( Jäderholm, 1903 )

Peña Cantero, Álvaro L. & Marzal, Marina Fresneda, 2018, Benthic hydroids (Cnidaria: Hydrozoa) from off George V Coast (East Antarctica), Zootaxa 4441 (1), pp. 121-136 : 128-130

Abietinella operculata ( Jäderholm, 1903)

( Fig. 3G )

Abietinella operculata — Marques et al., 2005: 1443 –1450 (synonymy).

Material examined. 48EV194, a stem up to 63 mm high and a partially stolonal colony, on S. glacialis (IK–2012– 10437) and a partially stolonal colony (IK–2012–10435).

Remarks. Well-known species that does not need further comment. See Marques et al. (2005) for an eXtensive description of the species and a wide discussion about the genus.

Ecology and distribution. Present material collected at depths between 325 and 409 m. Antarctic-Patagonian distribution ( Stepanjants 1979).

Figures

FIGURE 3. Staurotheca antarctica Hartlaub, 1904: A, hydrothecae. Staurotheca nonscripta Peña Cantero, Svoboda & Vervoort, 1997: B, hydrotheca. Staurotheca pachyclada (Jäderholm, 1904): C, hydrotheca. Antarctoscyphus spiralis (Hickson & Gravely, 1907): D, internode with hydrotheca showing intrathecal cusps (arrow). Symplectoscyphus glacialis (Jäderholm, 1904): E, internode with hydrotheca. Halecium interpolatum Ritchie, 1907: F, incipient stem with distal hydrotheca (arrow pointing to characteristic long and straight basal part of internode). Abietinella operculata (Jäderholm, 1903): G, hydrotheca (arrow pointing to disc-shaped operculum) and nematotheca (arrow). Schizotricha nana Peña Cantero, Svoboda & Vervoort, 1996: H, unforked hydrocladial internodes showing hydrothecae and nematothecae. Oswaldella erratum Peña Cantero & Vervoort, 1997: I, hydrocladial internode showing hydrotheca and mesial inferior nematotheca (arrow). Scale bars: 200 µm.