Neopetrosia subtriangularis (Duchassaing, 1850),

Van, Rob W. M., 2017, Sponges of the Guyana Shelf, Zootaxa 1, pp. 1-225: 36-37

publication ID

http://doi.org/ 10.5281/zenodo.272951

publication LSID

lsid:zoobank.org:pub:6D68A019-6F63-4AA4-A8B3-92D351F1F69B

persistent identifier

http://treatment.plazi.org/id/03A80010-7774-FF88-FF14-A62294F1FA29

treatment provided by

Plazi

scientific name

Neopetrosia subtriangularis (Duchassaing, 1850)
status

 

Neopetrosia subtriangularis (Duchassaing, 1850) 

Figures 22View FIGURE 22 a –c

Restricted synonymy:

Spongia subtriangularis Duchassaing, 1850: 26  .

Thalysias subtriangularis  ; Duchassaing & Michelotti 1864: 85, pl. XVII fig. 1

Xestospongia subtriangularis  ; Wiedenmayer 1977: 113, pl. 14 figs 1–5, text-fig. 128; Van Soest 1980: 71, pl. XII fig. 2, textfig. 26 (with additional synonyms).

Neopetrosia subtriangularis  ; Desqueyroux-Faúndez & Valentine 2002: 911 (with discussion of synonyms).

Material examined. RMNH Por. 9882, Suriname, ‘ Snellius O.C.P.S. ’ Guyana Shelf Expedition, station G56, 7.26°N 56.6667°W, depth 67–68 m, Agassiz trawl, 10 May 1966GoogleMaps  ; RMNH Por. 9892, Suriname, ‘ Snellius O.C.P.S. ’ Guyana Shelf Expedition, station F45, 6.4417°N 56.5467°W, depth 34 m, Van Veen grab, 7 May 1966GoogleMaps  ; RMNH Por. 9910, 9911, 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  ; RMNH Por. 10507, Suriname, ‘ Snellius O.C.P.S. ’ Guyana Shelf Expedition, station F46, 6.312°N 56.57°W, depth 25–29 m, bottom sand, 7 May 1966GoogleMaps  .

Description. Fragments of branches ( Fig. 22View FIGURE 22 a), 1–1.5 cm in diameter, with scattered small oscules of 2 mm in diameter. Surface optically smooth, punctate, with some faint subdermal grooves. Color (in alcohol) reddish or orangeish brown. Consistency firm.

Skeleton. At the surface ( Fig. 22View FIGURE 22 b) there is a regular distribution of rounded to squarish meshes made by tracts of 1–3 spicules, overlying a denser choanosomal skeleton of tracts of 30–40 µm diameter forming squarish meshes of up to 150–200 µm diameter. No visible spongin.

Spicules. Oxeas only.

Oxeas ( Fig. 22View FIGURE 22 c), curved, sharply pointed, in a large size variation, 132– 202 –240 x 6 – 8.1 –9.5 µm.

Distribution and ecology. Guyana Shelf, Greater Caribbean, NE Brazil, in lagoons, reefs, on sandy bottom, from shallow-water down to 100 m depth ( Guyana Shelf 25–68 m).

Remarks. The spicules of this common, widespread species are apparently variable over its geographic range, as Van Soest (1980) gives 120–186 x 3.5–8.5 µm for predominantly Puerto Rican specimens, Zea’s (1987) Colombian length measurements are similar, but thickness reported by him is up to 11.7 µm, whereas Campos et al. (2005) measured 60–230 x 2.5–6 µm in a Brazil specimen. The present measurements of 132–240 x 6 –9.5 µm are at the higher end of the variation, possibly because the specimens were from deeper water.

RMNH

National Museum of Natural History, Naturalis

Kingdom

Animalia

Phylum

Porifera

Class

Demospongiae

Order

Haplosclerida

Family

Petrosiidae

Genus

Neopetrosia

Loc

Neopetrosia subtriangularis (Duchassaing, 1850)

Van, Rob W. M. 2017
2017
Loc

Neopetrosia subtriangularis

Desqueyroux-Faundez 2002: 911
2002
Loc

Xestospongia subtriangularis

Van 1980: 71
Wiedenmayer 1977: 113
1977