Turbicellepora winstonae, Vieira, Leandro M., Gordon, Dennis P., Souza, Facelucia B. C. & Haddad, Maria Angélica, 2010

Vieira, Leandro M., Gordon, Dennis P., Souza, Facelucia B. C. & Haddad, Maria Angélica, 2010, New and little-known cheilostomatous Bryozoa from the south and southeastern Brazilian continental shelf and slope, Zootaxa 2722, pp. 1-53 : 32-33

Turbicellepora winstonae n. sp.

( Figures 73–76 , Table 15)

Material examined. Holotype. MZUSP 0 273, off Espirito Santo, Southeast Brazil, JOPS II, RV ‘Victor Hensen’, station 30A (18o59.9’ S, 38o27.8’ W, 90 m). Paratypes. MZUSP 0 318, Brazil, project REVIZEE South SCORE, RV ‘Prof. Wladimir Besnard’, station 6661. MZUSP 0 319, station 6673 (alcohol 70%). Additional material. MZUSP 0 64, Rio Grande do Sul, Brazil, project GEDIP II, RV ‘Prof. Wladimir Besnard’, BT extra between Station 1710 (30o03’ S, 47o58’ W, 407 m) and 1711 (30o28’ S, 48o28’ W, 194 m). MZUSP 0 300, Brazil, project REVIZEE South SCORE, RV ‘Prof. Wladimir Besnard’, station 6661. MZUSP 0 301, station 6673. MZUSP 0 320, station 6669. MZUSP 0 321, station 6681.

Diagnosis. Colony encrusting, forming a multilamellar nodule; autozooids with 6–16 small areolae pores, orifice large with deep poster and usually with 1–2 lateral-oral avicularia .

Etymology. Named in recognition of the major contribution of Dr Judith E. Winston (Virginia Museum of Natural History, USA) to biosystematics and bryozoology.

Description. Colony encrusting around a small particle of substratum, rounded, forming a multilamellar nodule 6.5 mm diameter. Zooids irregularly disposed owing to frontal budding, the frontal shield smooth, with 6–16 very small areolar septular pores along each margin. Primary orifice with very deep, broad, wedgeshaped poster, the condyles thickened, rounded, not protruding much. No oral spines. Adjacent to the anter is one or a pair (or sometimes lacking) of lateral-oral avicularia , the rostrum short, roundly subacute, with crossbar, directed distally. No other avicularia . Ovicell prominent, smooth, the ectooecium peforated by 18– 19 pores, not closed by the zooidal operculum. Ancestrula not seen.

n min–max mean SD Autozooid length 20 0.618–0.827 0.753 0.057 Autozooid width 20 0.059–0.716 0.592 0.043 Orifice length 20 0.204–0.247 0.225 0.013 Orifice width 20 0.161–0.228 0.182 0.015 Avicularium length 20 0.080–0.105 0.094 0.007 Avicularium width 20 0.074–0.099 0.094 0.007 Remarks. There are perhaps 27 previously described species that may be included in Turbicellepora sensu lato. Of the six species that occur in the Atlantic Ocean south of the equator, four are South African, one is from Patagonia (> 50° S) and only one, Turbicellepora pourtalesi Winston, 2005 , has been recorded from Brazil ( Vieira et al. 2008). All differ in details of the orificial sinus and avicularia from Turbicellepora winstonae n. sp., which, unusually for the genus, appears to lack vicarious avicularia .

At least two species of Turbicellepora with encrusting nodular colonies have been recorded in Atlantic waters — Turbicellepora coronopus ( Wood, 1844) and Turbicellepora nodulosa ( Lorenz, 1886) . These species are distinguished from T. winstonae by the shape of the proximal sinus, the presence of a single lateral-oral avicularium and ovicells with few pores. The eastern Atlantic species Turbicellepora turricula Cook, 1985 arises as short cylinders and has larger single lateral-oral avicularia and ovicells with proportionately larger pores. Turbicellepora patagonica Hayward, 1992 has a U-shaped orificial sinus with large rounded condyles, and a single suboral avicularium.

Distribution. Brazil: off São Paulo and Rio Grande do Sul states, 101–168 m (present study).

Figures

FIGURES 73 – 76. Turbicellepora winstonae n. sp., specimens from REVIZEE South Score station 6661 (MZUSP 0318), off São Paulo, Brazil. 73, Small nodular colony; 74 – 75, close-up of autozooids with opercula; 76, close-up of orifice and one ovicelled zooid.