Corella eumyota

Monniot, Françoise, 2013, The genus Corella (Ascidiacea, Phlebobranchia, Corellidae) in the Southern Hemisphere with description of a new species, Zootaxa 3702 (2), pp. 135-149: 140-141

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Corella eumyota


Corella eumyota  from Sub-Antarcic regions and Europe

Figs 5View FIGURE 5, 6View FIGURE 6

Material examined

- New Zealand: Portobello: shore and wharfs, coll. A.Wood, 2012. Dunedin, coll. Lambert, 16 /01/ 1994. - Amsterdam Island, 37 ° 50 S – 77 ° 30 E, 80m, 11 /01/ 1972, coll. Beurois. - South Africa, Hout Bay, 7 /02/ 1996, coll. Monniot.

- France: Le Havre harbour, 2010, 2011, 2012, coll. Breton; Fecamp 2007, coll. Breton; Camaret 2002, coll. Lambert; Arradon 2009, coll. Le Roux.

Turon (1988) partially described and represented specimens identified as C. eumyota  from Namibia (lagoon, 1m depth) but the specimens are lost (Turon pers. com.).Their tunic is said to present “small tubercles” and the stigmata have only 1 or 2 spiral turns. The gonads (Turon 1988 Fig. 5View FIGURE 5) are limited to the bottom of the gut loop, The genital ducts are not figured nor mentioned. This species may be C. eumyota  .

Brewin (1946) described as C. eumyota  ascidians from New Zealand and precised that some of them were slightly different with a long sperm duct. She probably overlooked the presence of a second species C. brewinae  n.sp. in addition to C eumyota  .

There is a dense population of Corella  developed in the littoral area in the vicinity of Portobello ( New Zealand) and it has been known for a long time. Specimens newly collected from Portobello and specimens collected by Lambert (1994) from Dunedin have been compared with the Chilean ascidians. The results are absolutely similar: body proportions ( Fig. 5View FIGURE 5 A), muscular design ( Fig 5View FIGURE 5 B), dorsal tubercle ( Fig 6View FIGURE 6 B), branchial tissue ( Fig. 6View FIGURE 6 A) dorsal languets ( Fig. 6View FIGURE 6 C), anus ( Fig. 6View FIGURE 6 D), genital papillae. Similarly no differences could be found with the numerous specimens collected along the French coast. (coll. Breton).