Corella brewinae Monniot, 2013, n. sp.

• Main Author: Monniot, Françoise
• Format: Other/Unknown Material
• Language: unknown
• Published: 2013
• Subjects: Biodiversity; Taxonomy; Animalia; Chordata; Ascidiacea; Enterogona; Corellidae; Corella; Corella brewinae; New Zealand; Amsterdam Island; Antarc*; Antarctica
• Online Access: https://zenodo.org/record/6149685; https://doi.org/10.5281/zenodo.6149685

Corella brewinae n. sp. Figs 4 B, 7, 8, 9. Material examined - Amsterdam Island SE, 11 /01/ 1972, 80m, coll. Beurois. Syntypes (MNHN P 4 COR.A 12) - New Zealand, Otago harbour, wharf, 2012, coll. A. Wood. - Stewart Island, 1875, coll. Filhol. - 54 ° 31 ’S – 159 °00 E, 110m, 18 /06/ 1968, Eltanin survey USA. The body shape varies but is more or less oval. The specimens up to 5cm in length are often found in aggregates of different sizes, and these clusters (Fig 4 B) are very similar to those of C. eumyota living in the same habitat. In life, the tunic is not completely smooth but wears irregular small papillae. The colour is pale yellow. Both siphons have 6 lobes. The oral aperture is apical and the atrial siphon opens at mid distance of the dorsal line. The body wall is thin and the musculature is visible through it (Fig. 7 A). Apart from the siphon sphincters, the muscles are essentially located over the left side with interlaced fibres grouped in ribbons (Fig 7 A). On the anterior part of the right side some longitudinal fibres are present but do not reach the level of the digestive tract. The oral tentacles are thin and long, we counted about 60 to 75 distributed in 3 orders of length in specimens 2.5cm long. The prepharyngeal band has two blades indented in a V dorsally and prolonged on the dorsal line in a groove (Fig. 8 D) as in C. eumyota and C. antarctica. The dorsal tubercle forms a C opened anteriorly with horns rolled inside (Fig 8 D). About 52 dorsal languets of equal size were counted in several specimens. The branchial tissue is flat, linked to the body wall by wide tubular structures ramified irregularly, less dense than those present in C. antarctica. The longitudinal vessels, 37 to 40 on each side, are held on wide papillae (Fig. 8 A, 9 B). The spiral stigmata are not regularly aligned as many secondary spirals are intercalated. Each spiral is interrupted several times. The number of turns is difficult to evaluate it varies from 3 to 4, rarely 5.This number is larger than in the branchial sac of ...