Rossella antarctica Carter 1872

• Main Authors: Goodwin, Claire E., Berman, Jade, Janussen, Dorte, Göcke, Christian, Hendry, Katharine R.
• Format: Other/Unknown Material
• Language: unknown
• Published: Zenodo 2016
• Subjects: Biodiversity; Taxonomy; Animalia; Porifera; Hexactinellida; Lyssacinosida; Rossellidae; Rossella; Rossella antarctica; Antarc*; Antarctic; Antarctica
• Online Access: https://doi.org/10.5281/zenodo.6055952; http://treatment.plazi.org/id/03D587C5F734FFD8FF24FB900D649D05

Rossella antarctica Carter 1872 Specimens. BELUM.Mc2015.284, cruise sample number NBP1103–DH95–sponge04, Sars Seamount 59° 43.76’S, 68° 53.93’W, 740–820m, Hein Dredge. BELUM.Mc2015.329, cruise sample number NBP1103–TO104– sponge04 and BELUM.Mc2015.335, cruise sample number NBP1103–TO104–sponge10, both Sars Seamount 59° 43.43’S, 68° 45.38’W, 570–820m, Otter Trawl. Comparative material examined. R. antarctica specimens from station the ANT XXIV/2 ( SYSTCO I) expedition (SMF 11734, 11735, 11908–11915, 11916–11930). External appearance (Figure 6 A, B). The three sponges are sacciform with a basal attachment and a terminal oscule. The largest specimen is 15cm long and 9cm wide and the smallest 5cm long and 2cm wide. All were cream coloured when collected and have a veil of projecting diactins which protrude up to 1.5cm from the body. No dense velum of protruding pentactins is present in the specimens. Spicules. Measurements are taken from BELUM.Mc2015.284, figures are restricted to spicules of high taxonomic value. Dermal spined pentactin: Very large spicules – tangential rays of the one specimen measures were 3750/117 µm. The spicules are covered with large, fairly widely spaced spines. Rough pentactin tangential ray 90–(122)–184 µm, proximal ray 80–(117)–110 µm Rough hexactin diameter 149–(268)–403 µm Oxyhexactin diameter 89–(115)–142 µm Oxyhexaster diameter 86–(102)–116 µm Calycocome (Figure 6 C) diameter 85–(99)–109 µm, number of secondary rays 4(5)6 µm, Complete ray length 43–(48)–55 µm, Primary ray length 6–(11)–13 µm, Centrum length 6–(10)–13 µm, Secondary ray length 20–(28)– 33 µm. Microdiscohexaster (Figure 6 D) diameter) 22–(33)–36 µm Remarks. This species differs from other Antarctic Rossella species by its distinctive spined dermal pentactins. It has relatively small (~100 µm) calycocomes with 3–8 secondary rays and primary and secondary rays of a similar length; this distinguishes it from many other species of Rossella which tend to have calycocomes with short primary and long secondary rays. The ...