(Table 1) Statistics of size measurements of Lagenoeca antarctica sp. n. and Salpingoeca abyssalis sp. n. (floating form) sampled during POLARSTERN cruise ANT-XXII/2 and METEOR cruise M63/2 ...

• Main Author: Nitsche, Frank
• Format: Dataset
• Language: English
• Published: PANGAEA 2007
• Subjects: Event label; Date/Time of event; Latitude of event; Longitude of event; Species; Ocean and sea region; DEPTH, water; Length; Length, standard deviation; Width; Width, standard deviation; MultiCorer; Bottle, Niskin; M63/2; ANT-XXII/2; Meteor 1986; Polarstern; Antarc*; Antarctic; Antarctica; Weddell Sea
• Online Access: https://dx.doi.org/10.1594/pangaea.848966; https://doi.pangaea.de/10.1594/PANGAEA.848966

Despite their high abundance and their high importance for the oceanic matter flux, heterotrophic nanoflagellates are only poorly studied in the deep-sea regions. Studies on the choanoflagellate distribution during two deep-sea expeditions, to the South Atlantic (5038 m) and Antarctica (Weddell Sea, 2551 m), revealed the deepest records of choanoflagellates so far. A new species, (Lagenoeca antarctica) with a conspicuous spike structure on the theca is described from deep Antarctic waters. Lagenoeca antarctica sp. n. is a solitary unstalked free living salpingoecid-like choanoflagellate. The protoplast is surrounded by a typical theca with unique spikes only visible in SEM micrographs. The ovoid cell nearly fills the whole theca and ranges in size from 4 to 6 µm. The collar measures 2-3 µm and the flagellum 3-5 µm. A second species, Salpingoeca abyssalis sp. n., was isolated from the abyssal plain of the South Atlantic (5038 m depth). Floating and attached forms were observed. The protoplast ranges from to 2 ... : n = 25 ...