Mycale (Mycale) topsenti Burton 1959
- Dataset
- Mycale species of the tropical Indo-West Pacific (Porifera, Demospongiae, Poecilosclerida)
- Rank
- SPECIES
Classification
- kingdom
- Animalia
- phylum
- Porifera
- class
- Demospongiae
- order
- Poecilosclerida
- family
- Mycalidae
- genus
- Mycale
- species
- Mycale topsenti
description
Fig. 91 c
description
We queried the World Porifera Database (Van Soest et al. 2020) and added the above results from our Indo-West Pacific Mycale (Mycale) study to arrive at the current tentative estimate of known accepted species, which numbers 63. Their distribution over the world oceans summarized as the numbers of species found in Marine Ecoregions of the World (cf. Spalding et al. 2007) is presented in Fig. 92. The subgenus is widespread, with polar-, temperate- and warm water species. The highest species densities occur in Indonesia, the Western Indian Ocean and some Antarctic regions. This is likely a combined effect of collecting efforts and the non-monophyletic nature of the subgenus. Also, many cold water species are not well known. More revisions of species groups are necessary to arrive at meaningful distribution patterns.
discussion
Comment. We re-examined Burton’s holotype and found his description accurate. Compared to the closely related Mycale (Mycale) sundaminorensis sp. nov. (reported by Burton as Mycale (Mycale) massa var. oceanica from the same station), the shape of the specimen (cf. Fig. 91 c) is more spreaded, less compact, the mycalostyles occur in a single category and with more distinct heads, and there is only a single category of sigmas, clearly larger than those of M. (M.) sundaminorensis sp. nov. (see also above).
discussion
Remark. The present key is state of the art, but suffers from several species not well known. Not all species treated below are certain members of Mycale (Mycale), and possibly some species may turn out to be synonyms.
distribution
Distribution. Oman, deep water.
materials_examined
Material examined. BMNH 1936.3. 4.542, holotype, Oman, South Arabian coast, 21.8333 ° N 59.8667 ° E, depth 1046 m, coll. John Murray Exped. stat. 54, 3 November 1933. Summary description. Small repent-ramose mass (Fig. 91 c), surface bumpy, with several small oscules. Color yellow-brown (alcohol). Consistency softly compressible. Ectosomal skeleton a tangential layer of megascleres, carried by ascending choanosomal megasclere tracts forming brushes near the surface. Spicules: mycalostyles 900 x 18 µm, anisochelae I 88 µm, anisochelae II 40 µm, anisochelae III 20 µm, sigma I 60 – 80 µm, trichodragmas 60 µm.
Name
- Homonyms
- Mycale (Mycale) topsenti Burton 1959