Javania antarctica Gravier 1914

Javania antarctica (Gravier, 1914)

Figs. 4 G–H, J, 18

Remarks. Javania antarctica was adequately re-described by Cairns (1982). The largest of the specimens reported herein (Fig. 4 H) is 33.0 x 18.9 mm in CD, 36.3 mm in height, and 8.6 mm in PD. The species can be characterized as having a thick stereome-reinforced pedicel, and five full cycles of septa (96) following the formula: S1– 2>S3>>S4>S5, the S3 being only slightly less wide than the S1–2. The axial edges of all septa are only slightly sinuous. It may be confused with Desmophyllum dianthus, but can be distinguished by its smooth, porcellaneous theca (vs costate and granular), less exsert septa, and more fragile septa.

Distribution. Previously known only from Antarctic waters off the Antarctic Peninsula, Weddell Sea, and the Scotia Ridge north to South Georgia at depths of 53–1280 m, these records extend its known distribution considerably northward to the cold temperate region off central Argentina (Fig. 18) at to the depth of 1626 m.

Material: PAT0108DR2, 1, MNCN; PAT0108DR7, 29, MNCN; PAT0108DR11, 1, MNCN; PAT0108DR15, 6, MNCN, and 1, USNM 1193321; PAT1008DR1, 1, MNCN; PAT1008DR12, 5, MNCN, and 2, USNM 1193320 and 1193319; PAT1008DR13, 19, MNCN; PAT1108DR1, 3, MNCN; PAT1108DR3, 8, MNCN; PAT1108DR5, 1, MNCN; PAT1108DR11, 9, MNCN; PAT1208DR7, 3, MNCN, and 1, USNM 1193323 and 1193324; PAT1208DR9, 11, MNCN, and 2, USNM 1193315; PAT1208DR14, 1, MNCN; PAT0209DR1, 6, MNCN; PAT0209DR3, 1, USNM 1193318 and 1193316; PAT0209DR4, 2, MNCN; PAT0209DR7, 1, MNCN; PAT0209DR10, 2, MNCN; PAT0209DR11, 3, MNCN; PAT0209DR14, 8, MNCN; PAT0209DR15, 4, MNCN; PAT0209DR16, 3, MNCN; PAT0210DR5, 3, MNCN; PAT0210DR6, 1, MNCN; PAT0210DR7, 1, MNCN; PAT0210DR8, 1, MNCN; ATL0310Lo87, 2, MNCN.