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 Hymeniacidon heliophila ( Wilson, 1911 ) Figures 116 a–c Stylotella heliophila Wilson in Parker, 1910 : 2 , fig. 1 ( nomen nudum ). Stylotella heliophila Wilson, 1911 : 13 (proper description); George & Wilson 1919 : 147 , pls LVIII fig. 13, LIX figs 18–19, LXVI fis 53a–c. Hymeniacidon heliophila ; De Laubenfels 1936 : 138 ; Wiedenmayer 1977 : 150 , pl. 30 fig.8, text-fig.152; Díaz et al. 1993 : 298 , figs 26, 33; Muricy et al. 2011: 94. Material examined. RMNH Por. 9834, Guyana , ‘Luymes’ Guyana Shelf Expedition, station 65, 7.5667°N 57.2667°W , depth 59 m , sandy shelly bottom, 2 September 1970 ; RMNH Por. 9923, Suriname , ‘ Luymes O.C.P.S. II’ Guyana Shelf Expedition, station M97, 7.3083°N 54.1667°W , depth 130 m , bottom coarse sand, 16 April 1969 . Description. ( Fig. 116 a) Irregular stringy lobes and thin branches, presumably detached from a buried main body, which was not collected. Also thin encrustations on dead shells and carbonate rubble. Skeleton. Loosely confused arrangement in the choanosome, tangential at the surface ( Fig. 116 b). Spicules. ( Figs 116 c,c1) Styles only. Styles, straight or slightly curved, often with faint tyle, 320– 411 –479 x 3 – 7.6 –9.5 µm. Distribution and ecology. Originally described from North Carolina , the species has been reported throughout the Caribbean region and also from Brazil (Muricy et al. 2011). Predominantly known from shallow-water, intertidal and mangrove habitats. The present records from sandy bottoms at 59–130 m depth are by far the deepest occurrence known for the species. Remarks. In view of the deep occurrence there is some doubt about the identification. However, similarity with the original description and subsequent morphological information does not warrant erecting a new species for the Guyana Shelf material. Authorship of this common Central West Atlantic species has been assigned to Parker (1910) by De Laubenfels (1936) (p.138). However , Parker himself (1910) (p. 2) made it abundantly clear that H.V. Wilson was in the process of describing this species and he only ‘borrowed’ the name for his physiological study. Apart from a figure of the species, there is no taxonomic description, nor a type specimen assignment in Parker’s paper. Effectively, Parker’s use of the name is a nomen nudum in the sense of the ICZN . Authorship and year of publication should go to Wilson (1911) , who gave a taxonomic description including information on the spicules. ICZN Art. 50.1 clearly stipulates the case that Parker’s (1910) referral to Wilson as the author of a forthcoming publication, in which the species is to be properly described, is a valid nomenclatorial procedure. In conclusion Hymeniacidon heliophila ( Wilson, 1911 ) is the proper author-year combination for this species.