Mycale (Grapelia) vansoesti Hajdu, 1995

Van, Rob W. M., Aryasari, Ratih & De, Nicole J., 2021, Mycale species of the tropical Indo-West Pacific (Porifera, Demospongiae, Poecilosclerida), Zootaxa 4912 (1), pp. 1-212 : 93-95

publication ID 10.11646/zootaxa.4912.1.1

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Mycale (Grapelia) vansoesti Hajdu, 1995


Mycale (Grapelia) vansoesti Hajdu, 1995 View in CoL

Figs 58 View FIGURE 58 a–c, 59a–e

Mycale (Grapelia) vansoesti Hajdu, 1995: 93 View in CoL , figs 6.65–69.

Material examined. Holotype ZMA Por. 10711, Seychelles, Mahé, NE coast, Cap Maçons and Anse de Forbans, 4.7667°S 55.5167°E, reef slope, depth 0–6 m, snorkeling, coll. R. W.M. van Soest, Netherlands Indian Ocean Expedition stat. 612, field nr. IOP-E 612/11, 12 December 1992 (pale blue-grey). GoogleMaps

Summary description (Partially after Hajdu 1995). Pale, blue-grey mass ( Fig. 58a View FIGURE 58 ) encrusting on a coralline algal nodule. Size 3.5 x 1.5 cm in lateral expansion, thickness about 0.4–0.5 cm. Surface microconulose, with a few small oscules of 2 mm diameter. Consistency compressible, fragile. Choanosomal skeleton plumose ( Fig. 58 View FIGURE 58 b–c), consisting of straight, mostly undivided, spicule tracts of 100 µm diameter, near the surface dividing into thinner tracts 20–50 µm in diameter carrying the surface membrane. No clearly visible tangential ectosomal skeleton of megascleres, but a concentrated presence of rosettes of anisochelae I forms a replacement skeleton. Spicules ( Fig. 59 View FIGURE 59 a–d) mycalostyles ( Fig. 59a,a View FIGURE 59 1 View FIGURE 1 ), straight, comparatively thin, with elongate heads, 324– 350.1 –391 x 3– 4.4 – 5 µm, anisochelae I ( Figs 59b View FIGURE 59 ) comparatively elongate and less strongly curved, with relatively small upper unguiferous alae and squarish lower alae, 51– 61.3 – 81 µm (arranged in rosettes ( Fig. 58b View FIGURE 58 ) of 144– 155.8 – 170 µm diameter), anisochelae II ( Figs 59c,c View FIGURE 59 1 View FIGURE 1 ) bipocilla-like with thin shaft, thin-bladed fused serrated upper alae and lower alae with median serrated / short-teethed alaee ( Figs 59c View FIGURE 59 ) or multiple-teethed alae ( Figs 59c View FIGURE 59 1 View FIGURE 1 and 59c View FIGURE 59 2 View FIGURE 2 ), possibly in two size categories, 9– 17.2 – 28 µm (arranged in irregular rosettes ( Fig. 58c View FIGURE 58 ) of 44–51 µm diameter, occasionally clustered into larger masses), anisochelae III ( Fig. 59d View FIGURE 59 ), shaped conventionally palmate, faintly spurred, 14– 16.2 – 20 µm, and thin sigmas ( Fig. 59e View FIGURE 59 ) 45– 50.6 – 59 µm.

Distribution. Mahé, Seychelles, depth 0– 6 m.

Remarks. This is a very distinct species on account of the elongate anisochelae I and the quite peculiar bipocilla-like anisochelae II. The closest species are M. (G.) trichophora and M. (G.) menylloides , with more curved and thicker-shafted anisochelae I, and short-shafted bipocilla-like anisochelae II of a more globular thicker form with incurved elaborate alae.

Additional Mycale (Grapelia) species from the region


Universiteit van Amsterdam, Zoologisch Museum


Departamento de Geologia, Universidad de Chile














Mycale (Grapelia) vansoesti Hajdu, 1995

Van, Rob W. M., Aryasari, Ratih & De, Nicole J. 2021

Mycale (Grapelia) vansoesti

Hajdu 1995: 93
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