Carter, 1879a : 346 Plakortis angulospiculatus Zea 1987 : 222 Moraes & Muricy 2003 : 386 Rützler et al. 2014 : 16 Sponges of the Guyana Shelf Van, Rob W. M. Zootaxa 2017 1 1 225  Rützler et al. 2014 : 16 4JJ2C Carter, 1879 Carter 1879 [151,656,1331,1357] Homoscleromorpha Plakinidae Plakortis Animalia Homosclerophorida 191 192 Porifera species angulospiculatus     Suberites angulospiculatus  Carter, 1879a: 346, pl. XXVIII figs 8a–b.    Plakortis angulospiculatus; Van Soest 1981: 3;  Zea 1987: 222, fig. 81, Pl. 13 figs 6–7;  Moraes & Muricy 2003: 386, fig. 2;  Rützler et al.2014: 16.    Material examined. RMNHPor. 9918, Suriname, ‘ Luymes O.C.P.S.II’ GuyanaShelf Expedition, station M97, 7.3083°N 54.1667°W, depth  130 m, bottom coarse sand,  16 April 1969.   Description. ( Fig. 121a) Pale beige (in alcohol), massive fragments, size of largest 5 x 3 x 2cm. The fragments are overgrown by a crust with digitations of  Haliclona (Gellius)aff. flagellifera, which likely affected color and surface characteristics. Noapparent oscules. Consistency firm.  Skeleton. Surface skeleton consists of a tangential crust pierced by regularly distributed pores, 80–250 µm in diameter.  Spicules. ( Figs 121b–d) Diods, triods. Diods robust, in a large size variation ( Figs 121b–c), but no clear size categories, 57– 134–202 x 2– 5.1– 8 m. Triods ( Fig. 121d), both equiangular and Y-shaped forms, actines 21– 44.1– 72 x 1– 3.4–5 µm (‘cladomes’ 39– 69.5–123 µm).   Distribution and ecology. GuyanaShelf, Jamaica, Curaçao, Colombia,  Belize, from shallow water down to  130 m.   Remarks. In the key to the Central WestAtlantic  Plakortisspecies provided by Ereskovsky et al.2014(pp. 303–304) the present specimen keys out as  Plakortis angulospiculatus( Carter, 1879a). Few other species of  Plakortishave diods larger than 200 µm as found in my specimen. Several more species have been described from NE Brazil(Domingos et al.2013), but all these have distinctly smaller diods. Brazilian records of  Plakortis angulospiculatus(cf. Muricy et al.2011) may belong to one of these new species, at least it is likely that not all belong to  P. angulospiculatus, so their presence is here left undecided. We noticed a few small spheres (7–10 µm diameter), the significance of which is unclear. Muricy (2011) was the first to report the presence of these spicules in Australian  Plakortisspecies, and subsequently also found them in Brazilian species (Domingos et al.2013). It remains to be decided if the presence of these, usually uncommon, spheres has taxonomic significance, as there is a distinct possibility that they are a product of high environmental silica content, or more simple spicular reduction (in this case reduced diods). 1424726528 1969-04-16 RMNH Luymes O. C. P. S. Suriname 130 7.3083 Suriname 7 -54.1667 191 192 1