Petrosia (Petrosia) weinbergi Van Soest, 1980,

Van, Rob W. M., 2017, Sponges of the Guyana Shelf, Zootaxa 1, pp. 1-225: 37-38

publication ID 10.5281/zenodo.272951

publication LSID


persistent identifier

treatment provided by


scientific name

Petrosia (Petrosia) weinbergi Van Soest, 1980


Petrosia (Petrosia) weinbergi Van Soest, 1980 

Figures 23View FIGURE 23 a –e

Petrosia weinbergi Van Soest, 1980: 75  , Pl. XII figs 3–4, text-fig. 27; Pulitzer-Finali 1986: 151, fig. 69; Alcolado & Gotera 1986: 2, figs 1–2; Zea 1987: 119; Campos et al. 2005: 17 View Cited Treatment , figs 10A –D.

Material examined. RMNH Por. 9898, Suriname, ‘ Snellius O.C.P.S. ’ Guyana Shelf Expedition, station G7, 7.28°N 56.7933°W, depth 64 m, bottom sand, 7 May 1966GoogleMaps  .

Description. Creeping branch ( Fig. 23View FIGURE 23 a) with one cut-off side branch. Size 9 cm long, 2–3 cm in diameter. Surface with a few oscules of 2–4 mm in diameter, and regularly pitted with ingrown zoanthids. Color (in alcohol) dark red-brown, possibly because of exposure to pigments from other sponges collected simultaneously. Consistency hard.

Skeleton. The choanosomal skeleton ( Fig. 23View FIGURE 23 b) is a reticulation of thick spongin-enforced spicule tracts of 80–200 µm in diameter (consisting of 10+ spicules), making meshes of 200 to 500 µm. The surface skeleton is an incomplete unispicular network ‘echinated’ by small spicules, carried by the choanosomal tracts.

Spicules. ( Figs 23View FIGURE 23 c –e) Larger and smaller oxeote spicules.

Oxeas, in three size categories, straight or curved, with strongylote and stylote modifications, especially in the larger category, (1) largest ( Fig. 23View FIGURE 23 c), often with blunt or rounded apices, 227– 243 –261 x 9 – 12.2 –14.5 µm, (2) intermediate sizes ( Fig. 23View FIGURE 23 d), likewise often with blunt apecies, 135– 157 –179 x 8 – 9.2 –11 µm, and (3) smallest ( Fig. 23View FIGURE 23 e), usually with sharply pointed apices, 57– 96 –106 x 4.5– 6.8 –7.5 µm.

Distribution and ecology. Guyana Shelf, Curaçao, Puerto Rico, Dominica, Cuba, Caribbean Colombia, Jamaica, Belize, NE Brazil, predominantly known from the deeper reef environment, but here reported from sandy bottom at 64 m depth. According to Campos et al. (2005) the species can reach 184 m.

Remarks. The specimen was compared to the holotype from Curaçao, ZMA Por. 0 3670 and found to be closely similar. The nature of the larger megascleres is variably oxeote, strongylote and rarely style-like, which is a characteristic feature of this species. Not all records of P. weinbergi  are certainly conspecific (e.g. Lehnert’s (1993) description from Cozumel appears to be likely a different Petrosia  ), but the distribution is wide, covering most of the Caribbean and the Northeast Brazilian regions. 


National Museum of Natural History, Naturalis


Universiteit van Amsterdam, Zoologisch Museum














Petrosia (Petrosia) weinbergi Van Soest, 1980

Van, Rob W. M. 2017

Petrosia weinbergi

Campos 2005: 17
Zea 1987: 119
Pulitzer-Finali 1986: 151
Alcolado 1986: 2
Van 1980: 75