Mycale (Zygomycale) pectinicola Hentschel, 1911

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 : 184-187

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Mycale (Zygomycale) pectinicola Hentschel, 1911


Mycale (Zygomycale) pectinicola Hentschel, 1911 View in CoL

Figs 120 View FIGURE 120 a–b, 121a–l

Mycale pectinicola Hentschel, 1911: 299 View in CoL , fig. 8.

Mycale (Zygomycale) pectinicola View in CoL ; Calcinai et al. 2013: 47, fig. 31, table 14.

Material examined. ZMB 4404 View Materials , syntype (2 specimens, Figs 120 View FIGURE 120 a–b), West Australia, Shark Bay, 3.5–16 m depth, coll . R. Hartmeyer & W. Michaelsen, 1905, stats. 9, 14 and 15, 30 September 1905 .

ZMA Por. 07634, Indonesia, Sumatera, Biliton (Belitung), approx. 2.83°S 107.92°E, depth 20–40 m, bottom muddy sand, on Mimachlamys shell (ex ZMA Moll. 143 701), coll. H.H. Dijkstra, from local fishermen, 1986 GoogleMaps .

Description. The syntype ( Figs 120 View FIGURE 120 a–b) is massively encrusting the upper ( Fig. 120a View FIGURE 120 ) and lower valves ( Figs 120b View FIGURE 120 ) of shells identified as Mimachlamys spinicostata Dijkstra & Beu, 2018 (Henk Dijkstra in litteris). The greatest thickness of the sponge is up to 6 cm. The thicker parts have a papillate surface. Color (in alcohol) mixture of reddish, greyish and yellowish tinges. The ZMA specimen ( Fig. 121a View FIGURE 121 ) from Indonesia has been cut off from the shell of Mimachlamys sanguinea ( Linnaeus, 1758) . It largely lost its shape and is fragmentary. No ‘skin’ is left, because it was kept in a dry condition before having been put in alocohol. Color on deck ‘polychromatic reddish’.

Skeleton. Choanosomal skeleton ( Fig. 121b View FIGURE 121 ) of spongin-enforced megasclere tracts of 10–15 spicules thick (type), 80–200 µm in diameter (ZMA specimen), fanning out below the surface into thinner tracts with little spongin (type). Ectosomal skeleton of the type is aegogropila-like with triangular-polyangular meshes formed by megasclere tracts with thickness of 5–10 spicules. Inbetween the tracts occur rosettes of anisochelae I (type).

Spicules. Mycalostyles ( Figs 121 View FIGURE 121 c–l), three categories of anisochelae, isochelae, two categories of sigmas, toxas, raphides arranged in trichodragmas, micracanthoxeas.

Mycalostyles ( Fig. 121c,c View FIGURE 121 1 View FIGURE 1 ), robust with faintly developed heads, 286– 303.2 –318 x 5– 8.6 – 11 µm (ZMA specimen), 200–286 x 4–8 µm (type).

Anisochelae I ( Fig. 121d View FIGURE 121 ), slim, with outward-curved upper median alae and comparatively feebly developed lower alae, free part of the shaft 50% of spicule length, 42– 46.3 – 50 µm ( ZMA specimen), 40–45 µm (type) .

Anisochelae II ( Fig. 121e View FIGURE 121 ), compact, with robustly developed upper and lower alae, with free part of the shaft 15–20% of spicule length, not recognized separately in the type by Hentschel and by Calcinai et al. (obviously included in the size of the anisochelae III), rare in the ZMA specimen, 20–24 µm (n = 5).

Anisochelae III ( Fig. 121f View FIGURE 121 ), with well developed upper alae, but reduced lower alae, 16– 17.1 – 19 µm (ZMA specimen), 15–28 µm (unrecognized anisochelae II included) (type).

Isochelae ( Fig. 121g View FIGURE 121 ), well developed, 10– 10.8 – 12 µm (ZMA specimen), 9–10 µm (type).

Sigma I ( Fig. 121h View FIGURE 121 ), robust, relatively narrow, 76– 81.3 –84 x 4– 4.7 – 6 µm ( ZMA specimen), 80–85 µm (type) .

Sigma II ( Fig. 121i View FIGURE 121 ), smaller and thinner 17– 21.2 – 24 µm x 1 µm (ZMA specimen), but not specified in the type description (Calcinai et al. measured them to be 15–35 µm).

Toxas ( Fig. 121j View FIGURE 121 ), shallow-curved with slightly upturned apices, 57– 70.6 – 98 µm (ZMA specimen), approximately 40 µm (‘4x the length of the isochelae’) described for the type (15–60 µm according to redescription in Calcinai et al.).

Raphides ( Fig. 121k View FIGURE 121 ), fusiform, in trichodragmas, rare, 30– 32.2 –36 x 7–8.0– 10 µm (ZMA specimen); presumably these are mentioned in Hentschel’s description as ‘microxe, spindelf̂rmig, selten’ (measured by Calcinai et al. as 15–20 µm),.

Micracanthoxeas ( Fig. 121l View FIGURE 121 ), fusiform, strongly spined, 3–4 µm (ZMA specimen); presumably not mentioned in the type description, but present nevertheless (Calcinai et al. discovered and measured them to be about 4 µm long, sparingly spined),.

Distribution. Western Indonesia; also Shark Bay, West Australia, 3.5–16 m depth.

Remarks. Calcinai et al. (2013: 47, fig. 31, table 14) studied the type material and published SEM images and measurements of the spicules. We complement this here by providing a photo of the habitus. For further details see Calcinai et al. Our Indonesian specimen conforms closely to the type material, although the original description of the type and its redescription in Calcinai et al. lack details about anisochelae II and III. We also provide the identity of the shells on which the type was encrusted, thanks to Pectinidae expert Henk Dijkstra.Apparently, the sponge has a preference for shells of the genus Mimachlamys Iredale, 1929 .

The spicule complement of M. (Z.) pectinicola is largely similar to that of M. (Z.) parishii (cf. above) and virtually indistinguishable from M. (Z.) ramulosa Carballo & Cruz-Barraza, 2010 . These species both have ramose habitus, which appears to be a clear difference from the present species.


Departamento de Geologia, Universidad de Chile


Universiteit van Amsterdam, Zoologisch Museum














Mycale (Zygomycale) pectinicola Hentschel, 1911

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

Mycale (Zygomycale) pectinicola

Calcinai, B. & Bavestrello, G. & Bertolino, M. & Pica, D. & Wagner, D. & Cerrano, C. 2013: 47

Mycale pectinicola

Hentschel, E. 1911: 299
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