Borojevia voigti

Van, Rob W. M. & De, Nicole J., 2018, Calcareous sponges of the Western Indian Ocean and Red Sea, Zootaxa 4426 (1), pp. 1-160: 26-27

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Borojevia voigti

sp. nov.

Borojevia voigti  sp. nov.

Figures 6a–d View Figure , 7a–d View Figure

Material examined. Holotype, ZMAAbout ZMA Por. 13444, Israel, pillar container port, Gulf of Aqaba, depth 5 m, scuba, coll. M. Wunsch, field nr. AQ 65, 5 July 1998. 

Description. Cormus ( Figs 6a,a View Figure 1 View Figure ) a greyish white cushion ( Fig. 6a View Figure 1 View Figure , arrow), brighter white in alcohol ( Fig. 6a View Figure ), made up of tightly anastomosed thin tubuli. Oscules small, about 2 mm diameter, flush with the surface. Size of entire specimen is 2.5 x 2 x 1 cm.

Aquiferous system. Asconoid.

Skeleton. ( Figs 6b–d View Figure ) Tubuli walls consist of one–two layers of triactines and tetractines. Apical actines of tetractines protruding into the tubar lumen ( Fig. 6d View Figure ).

Spicules. ( Figs 7a–d View Figure ) Triactines and tetractines, about equal in number. Some trichoxea-like spicules appear present in the spicule slides.

Triactines ( Fig. 7a View Figure ) equiradiate and equiangular, with conical actines measuring 42– 89 –117 x 7 – 8.7 –11 µm.

Tetractines ( Figs 7b–d View Figure ) shaped similarly and of approximate equal size. Apical actines straight, equal in length or longer than the actines of the basal triradiate system, tapering to a thin point ( Fig. 7b View Figure ), occasionally entirely smooth ( Fig. 7c View Figure left), but usually provided with a few small spines ( Figs 7c View Figure right). Actines of the basal triradiate system 32– 61 –105 x 4 – 6.8 –10 µm, apical actines 24– 67 –138 x 3 – 5.1 –7 µm.

?Trichoxeas ( Fig. 7d View Figure ), up to 300+ µm, quite thin (less than 0.5 µm in thickness). Not certainly proper as they are not visible in the sections.

Distribution and ecology. Red Sea, Aqaba, under overhangs in reef localities.

Etymology. Named after Dr Oliver Voigt, München, for his excellent contributions to Calcarea systematics.

Remarks. The present specimen resembles to some extent Voigt et al. ’s (2017) description of Borojevia aff. aspina ( Klautau et al., 1994)  . The trichoxea-like spicules are present in the spicule slide at a low frequency. In the surface section ( Fig. 6c View Figure ) there are some thin long spicules, but they are indistinct and may not be proper to the sponge. Voigt et al. also observed that the trichoxeas are difficult to find in the slides. Voigt et al. did not observe spines on the apical actines of the tetractines, which is a distinct difference. In our new species the spines were very small and occasionally absent in our specimen ( Figs 7c View Figure left), thus we assume our and Voigt et al. ’s specimens belong to different closely related species. Like Voigt et al. ’s specimen ours has whitish color and it lacks distinct tripods. Since Borojevia aspina  is a Brazilian species, the likelihood that a species living on reefs in the Red Sea is conspecific with the Brazilian population is judged to be quite small.

Borojević (1967) described the Mediterranean species Clathrina cerebrum  from Eastern South Africa (Natal coast). This combination is now assigned to Borojevia  and restricted to the Mediterranean (cf. Klautau et al. 2016). It is cushion-shaped like the new species, but it has tripods, making it unlikely to be the same species.

So far, no other species of Borojevia  have been reported from the region, but below we will describe two additional species. Differences with the present species will be given in the Remarks sections of these species.

We were unable to obtain a partial 28SrRNA sequence of this specimen.


Universiteit van Amsterdam, Zoologisch Museum