Sponges of the Guyana Shelf Author Van, Rob W. M. text Zootaxa 2017 1 1 225 journal article 37320 10.5281/zenodo.272951 e2c88f4c-3ac2-45f9-95e4-99b75561a081 1175-5326 272951 6D68A019-6F63-4AA4-A8B3-92D351F1F69B Ciocalypta alba Carvalho, Carraro, Lerner & Hajdu, 2003 Figures 114 a–f Ciocalypta alba Carvalho et al. , 2003 : 2 , figs 1–2. Material examined. RMNH Por. 9938, Guyana , ‘Luymes’ Guyana Shelf Expedition, station 63, 7.5833°N 57.0667°W , depth 71 m , sandy bottom, 31 August 1970 . Description. ( Fig. 114 a) A single fistule of about 2.5 cm long, 15 mm in diameter, encrusting and consolidating several dead mollusk shells. The shape is equidiametrical ending in a short closed pointed apex. The smooth skin is glassy grey, transparent. Inside a darker colored central axis is visible, surrounded by large subdermal spaces. Consistency elastic but fragile. Skeleton. The ectosomal skeleton ( Fig. 114 b–c) is a tangential halichondrioid reticulation of spicule tracts, 2–7 spicules in cross section, intercrossing and anastomosing. The central axis is a thick aligned mass of oxeas, giving off side branches running to the surface, supporting the ectosomal skeleton. Spicules. ( Figs 114 d–f) Oxeas only. Oxeas, symmetrical, predominantly slightly curved, sharply pointed, in a large size range, divisible in three almost overlapping size categories, (1) large ( Figs 114 d,d1), 576–816 x 9–21 µm, (2) middle-sized ( Figs 114 e,e1), 316–512 x 6.5–10 µm, and (3) small ( Figs 114 f,f1), 182–308 x 4–7 µm; overall oxea size 182– 453 –816 x 4 – 9.6 –21 µm. Distribution and ecology. Guyana Shelf, SE Brazil , in sandy bottom at 12–71 m depth. FIGURE 114. Ciocalypta alba Carvalho, Carraro, Lerner & Hajdu, 2003 , a, habitus of RMNH Por. 9938 (scale bar = 1 cm), b, light microscopic image of surface skeleton, c, detail of b, d–f, SEM images of the spicules, d, large oxea, d1, details of d, e, middle-sized oxea, e1, details of e, f, small oxea, f1, details of f. Remarks. The single fistule matches all details described by Carvalho et al. 2003 : the transparent ‘skin’, the central axis of oxeas and the tangential halichondroid skeleton at the surface, and the sizes and categories of the oxeas. The type material is much bigger, with dozens of fistules, but the present individual fistule is closely similar to one of the fistules of the type . Another Central West Atlantic Ciocalypta species is C. gibbsi ( Wells, Wells & Gray, 1960 ) (originally as Ciocalapata ), but this has distinctly smaller and thinner spicules. Carvalho et al. 2003 also assigned Topsentia pseudoporrecta Díaz, Pomponi & Van Soest, 1993 to Ciocalypta , but since its fistules are solid and nontransparent, I do not think this is warranted. It differs also clearly from C. alba and C. gibbsi in having very much larger oxeas (up to 1800 µm). The type species of Ciocalypta , European C. penicillus Bowerbank, 1862 has styles as the dominant spicule type , but like Carvalho et al. (2003) I follow here Erpenbeck & Van Soest’s (2002) argument that the genus is characterized by the peculiar fistular shape and species may have oxeas, styles or both as spicules.