Isosecuriflustra pinniformis Vieira, Gordon, Souza & Haddad, 2010, n. sp.

• Main Authors: Vieira, Leandro M., Gordon, Dennis P., Souza, Facelucia B. C., Haddad, Maria Angélica
• Format: Other/Unknown Material
• Language: unknown
• Published: Zenodo 2010
• Subjects: Biodiversity; Taxonomy; Animalia; Bryozoa; Gymnolaemata; Cheilostomatida; Flustridae; Isosecuriflustra; Isosecuriflustra pinniformis; Antarc*; Antarctic
• Online Access: https://doi.org/10.5281/zenodo.6206039; http://treatment.plazi.org/id/039687C7FFDAFFF9FAEF2264FC5BFF5B

Isosecuriflustra pinniformis n. sp. (Figures 8–11, Table 4) Material examined. Holotype . MZUSP 0 277, Brazil, project REVIZEE South SCORE, RV ‘Prof. Wladimir Besnard’, station 6661. Paratype . MZUSP 0 278, Brazil, project REVIZEE South SCORE, RV ‘Prof. Wladimir Besnard’, station 6674. Diagnosis. Colony unilaminar, with overall shape resembling a feather; zooids rectangular to hexagonal with entirely membranous frontal surface and a D-shaped operculum; spines, avicularia and kenozooids absent; ovicells immersed in succeeding zooid and closed by operculum of the maternal autozooid, with reddish embryos. Etymology. The epithet pinniformis alludes to the characteristic feather shape of colonies. Description. Colony erect and flexible, lightly calcified, unilaminar, unbranched, feather-shaped, with slender proximal stem; larger colony (holotype) about 25 mm high and 4.5 mm wide; colonies attached by chitinized rhizoids in basal part of colony. Zooids more or less rectangular to hexagonal, tapering somewhat medially. Frontal surface entirely membranous; cryptocyst and gymnocyst absent; operculum D-shaped, with yellowish distal edge. No spines, avicularia or kenozooids. Ovicell hyperstomial, immersed in succeeding autozooid, closed by operculum of maternal autozooid, with reddish embryos. n min–max mean SD Autozooid length 20 0.778–0.976 0.879 0.051 Autozooid width 20 0.222–0.358 0.287 0.038 Ovicell length 20 0.346–0.445 0.401 0.026 Ovicell width 20 0.358–0.457 0.415 0.022 Remarks. Alloeoflustra Hayward & Winston, 1994 was established for Flustra angusta Kluge, 1914 from Antarctic waters, and included two other Antarctic species, Flustra tenuis Kluge, 1914 and Flustra thysanica Moyano, 1972. The genus was characterized by the absence of spines or frontal calcification and an ovicell that is closed by the operculum of the maternal autozooid, but Hayward (1995) noted that these characters conform to Isosecuriflustra Liu & Hu, 1991 (type species Flustra tenuis Kluge, 1914), which became a senior subjective ...