Mycale (Paresperella) sceptroides, Van & Aryasari & De, 2021

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 : 169-170

publication ID 10.11646/zootaxa.4912.1.1

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Mycale (Paresperella) sceptroides

sp. nov.

Mycale (Paresperella) sceptroides View in CoL sp.nov.

Figs 110 View FIGURE 110 a–c, 111a–e

Mycale (Paresperella) View in CoL spec. Van Soest & Hajdu 2002: 684, figs 11B–F.

Material examined. Holotype ZMA Por. 01739, Indonesia, Jawa, Jawa Sea, Northwest of Pulau Sabi , 6.6083°S 114.925°E, depth 83 m, muddy bottom, trawl, coll. Siboga Expedition stat. 318, field nr. SE483, 22 February 1900. GoogleMaps

Description ( Fig. 110a View FIGURE 110 ). Elongate growth, collected as a detached object, but presumably attached to an unidentified branching substratum. Color in preservation red-brown. Surface smooth but slightly bumpy and grooved. No visible openings. Size about 6.5 x 3 x 1 cm. Consistency soft, easily damaged.

Skeleton ( Fig. 110b View FIGURE 110 ). Choanosomal skeleton consisting of plumose spicule tracts, 120–180 µm in diameter, dividing and fanning out towards the surface into thinner tracts (20–30 µm), which carry the tangential ectosomal skeleton. This is an aegogropila-type skeleton with intercrossing thin tracts of 20–40 µm diameter (3–4 spicules thick) delimiting meshes of 250–400 µm in widest dimension. Rosettes of anisochelae I (90–102 in diameter) are scattered between the tracts (cf. Fig. 110b View FIGURE 110 ).

Spicules ( Figs 110c View FIGURE 110 , 111 View FIGURE 111 a–e). Mycalostyles, two categories of anisochelae, sigmas, toxas.

Mycalostyles ( Fig. 110c View FIGURE 110 , 111a,a View FIGURE 111 1–3 View FIGURE 1 View FIGURE 2 View FIGURE 3 ), ‘cladotylostylote’ in shape, with elongated heads with barely constricted neck, with slightly swollen opposite ends, polyaxone with four or more rounded or spined projections, 298– 324.3 – 423 x 8– 10.8 – 14 µm.

Anisochelae I ( Fig. 111b View FIGURE 111 ), well-developed, with curved shaft, free part 30–35 % of spicule length, 37– 44.8 – 57 µm.

Anisochelae II ( Fig. 111c View FIGURE 111 ), well-developed, free part of the shaft 20–25% of spicule length, upper frontal alae more than 50% of spicule length, lower frontal alae with small projection on upper rim, 22– 26.5 – 30 µm.

Sigmas ( Fig. 111d,d View FIGURE 111 1 View FIGURE 1 ), narrow-shaped, asymmetrical, about 2 µm thick, with flattened spines on both endings, 63– 68.0 – 87 µm.

Toxas ( Fig. 111e View FIGURE 111 ), rare, thin (about 1 µm or less), curved gradually and widely, 19– 23.2 – 28 µm.

Distribution and ecology. Indonesia, deeper water, down to 83 m.

Etymology. The name was coined by Maurice Burton in an unpublished manuscript on the sponges collected by the Siboga Expedition. The name refers to the polyaxone scepter-like endings of the megascleres.

Remarks. The new species differs from other toxa-bearing Mycale (Paresperella) from the region by having the toxas very small and thin, and by having ‘cladotylostylote’ megascleres. Both, Indian M. (P.) serratohamata ( Carter, 1880) and East South African M. (P.) toxifera ( Lévi, 1963) have ‘normal’ mycalostyles, without polyaxone endings, and their toxas, respectively 50 µm and 60–175 µm, are distinctly larger.

Australian Mycale (Paresperella) penicillium shares the two categories of anisochelae, but lacks toxas.

The South Atlantic species Mycale (Paresperella) curvisigma ( Lévi, 1969) has a similar spiculation as the present species, but shapes and sizes differ: megascleres are smaller (310–325 x 5–8 µm), more distinctly stylote, with the pointed end bifid; the two anisochelae categories are clearly smaller (20–23 and 9–10 µm); the toxas are shaped differently from the present species and measure 35 µm. Together with the distance between localities (Vema Seamount vs Jawa Sea) we conclude that the differences are sufficient to consider both separate closely related species.


Universiteit van Amsterdam, Zoologisch Museum














Mycale (Paresperella) sceptroides

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

Mycale (Paresperella)

Van Soest, R. W. M. & Hajdu, E. 2002: 684
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