Mycale (Mycale) grandoides, 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 : 135-137

publication ID 10.11646/zootaxa.4912.1.1

publication LSID


persistent identifier

treatment provided by


scientific name

Mycale (Mycale) grandoides

sp. nov.

Mycale (Mycale) grandoides View in CoL sp.nov.

Figs 87 View FIGURE 87 a–d, 88a–g

Material examined. Holotype ZMA Por. 02904, Indonesia, Nusa Tenggara, Sapeh Strait , 8.3916°S 119.0733°E, bottom corals and shells, depth 69 m, dredge, coll. Siboga Expedition stat. 049a, field nr. SE1345.4, 14 April 1899. GoogleMaps

Paratype ZMA Por. 01613, Indonesia, Nusa Tenggara, between Komodo and Sumbawa, 8.5°S 119.125°E, bottom dead corals and sand, depth 73 m, dredge, coll. Siboga Expedition stat. 310, field nr. SE54 GoogleMaps CXIII–I, 12 February 1900 .

Description ( Fig. 87 View FIGURE 87 a–b). The holotype ( Fig. 87a View FIGURE 87 ) has a detached cylindrical shape with both ends rounded, size 3 cm high, 1 cm in diameter. The paratype ( Fig. 87b View FIGURE 87 ) has a similar cylindrical shape, so this is likely an important feature of the species, Surface is smooth (holotype) or slightly roughened (paratype) and lacks visible openings. The color in alcohol is dirty white to pale orange. Consistency compressible, but crumbly and easily damaged.

Skeleton ( Figs 87 View FIGURE 87 c–d). Plumose, with long undivided spicule tracts ( Fig. 87c View FIGURE 87 ), 80–130 µm in diameter, separated at distances of 400–600 µm. In the deeper parts of the choanosome many loose megascleres are strewn without arrangement. Anisochelae I occur in clusters ( Fig. 88a View FIGURE 88 ) that may be characterized as indistinct rosettes and and anisochelae II occur in vaguely circular arrangement ( Fig. 88b View FIGURE 88 ), associated with the skeletal tracts, but neither form clear rosettes. At the surface ( Fig. 87d View FIGURE 87 ), there is a dense mass of intercrossing tangentially arranged megascleres, carried by the extended endings of the choanosomal tracts.

Spicules ( Figs 88 View FIGURE 88 c–i). Mycalostyles, three categories of anisochelae, two categories of sigmas, trichodragmas.

Mycalostyles ( Figs 88c,c View FIGURE 88 1 View FIGURE 1 ), slightly rounded or straight, with narrow bluntly rounded heads, without visible constricted ‘neck’, with sharply pointed end, 405– 485.7 –576 x 11– 14.1 – 19 µm.

Anisochelae I ( Fig. 88d View FIGURE 88 ), of ‘normal’ shape, with free part of the shaft approximately 35% of spicule length, with prominent oval upper alae, lower median alae broad with straight upper rim, lower latera alae rounded, 57– 77.8 – 90 µm.

Anisochelae II ( Fig. 88e View FIGURE 88 ), very common in both specimens, shape compact, globular in outline, with free part of the shaft 15% or less of the length of the spicule, with upper alae extended outwards but with rims curved inwards agains, shape of alae oval with rounded rims, with lower alae also well-developed, both median and lateral alae rounded, 25– 30.6 – 37 µm.

Anisochelae III ( Fig. 88f View FIGURE 88 ), upper alae dominating, forming a sheath around the upper part of the shaft, lower part lacking alae and provided with a distinct spur, 16– 18.8 – 22 µm.

Sigma I ( Fig. 88g View FIGURE 88 ), about 1–1.5 µm in thickness, asymmetrical, 39– 48.1 – 60 µm.

Sigma II ( Fig. 88h View FIGURE 88 ), thin, tending to be symmetrical, 13– 19.3 – 24 µm.

Trichodragmas ( Fig. 88i View FIGURE 88 ), straight, compact, variable in length, 15– 28.5 –39 x 5– 6.4 – 9 µm.

Distribution and ecology. Both specimens were obtained from nearby localities in Sape (or Sapeh) Strait between the islands of Komodo and Sumbawa, Indonesia, at greater depths (69–73 m).

Etymology. Grandoides is a composite word consisting of grandis, a Latin adjective meaning great or large, and -oides, a suffix from Ancient Greek meaning ‘resembling’; the composite name is chosen because of the similarity of the present species to Mycale (Mycale) grandis .

Remarks. The new species resembles M. (M.) grandis in the overall spicule complement, with all spicule types of that species present in approximately the same size range, except for anisochelae I. The latter lacks the size and characteristic shape, being much more compact, with oval upper alae and shorter free part of the shaft. Anisochelae II are even more compact than those of M. (M.) grandis , and its upper alae curve outwards giving the shape a characteristic globular outline. The mycalostyles appear oxea-like in having a narrow bluntly rounded head lacking any swelling or subterminal neck. The shape of the specimens is fingerlike unlike most M. (M.) grandis specimens. Because of the paucity of material for the new species and lack of in situ images, it is possible that some of the mentioned differences may turn out to have limited value for distinction of M. (M.) grandis and M. (M.) grandoides sp.nov. if more and better known material will be found.

The nearest to this species in morphology is probably Mycale (Mycale) sundaminorensis sp.nov. The two are compared below.

There is also considerable similarity with M. (M.) crassissima , which has the same spicule complement, but the shape of the anisochelae II is clearly different.


Universiteit van Amsterdam, Zoologisch Museum













GBIF Dataset (for parent article) Darwin Core Archive (for parent article) View in SIBiLS Plain XML RDF