Kebira

Van, Rob W. M. & De, Nicole J., 2018, Calcareous sponges of the Western Indian Ocean and Red Sea, Zootaxa 4426 (1), pp. 1-160: 144-146

publication ID

https://doi.org/10.11646/zootaxa.4426.1.1

publication LSID

lsid:zoobank.org:pub:18929E20-5296-4458-8A8A-4F5316A290FD

persistent identifier

http://treatment.plazi.org/id/386CC616-DCFD-A5A0-FF67-8C4AFBDBFED9

treatment provided by

Plazi

scientific name

Kebira
status

 

Kebira  spec.

Figs 90a–g View Figure

Material examined. ZMAAbout ZMA Por. 10379b, Seychelles, Mahé, E coast, N of Moyenne Island, 4.6167°S 55.5167°E, depth 1–7 m, reef, snorkeling, coll. R.W.M. van Soest, field nr. NIOP-E stat. 606, 10 December 1992.

Description. The specimen is small and tubular ( Fig. 90a View Figure ), about 1.5 cm high, 0.5 cm in diameter, with a narrow apical oscule. Color in alcohol dirty white. Surface smooth and shining, due to a thick surface armor of tangential giant diactines.

Aquiferous system. Leuconoid.

Skeleton. In cross section there is a thin cortical layer of triactines with long unpaired actines carried by a thick mass of tangentially arranged giant diactines. The choanosome is a mass of triactines traversed in places by short tracts of nail-shaped triactines. The atrial skeleton is a layer of tri- and tetractines with short unpaired actines and straight paired actines.

Spicules. ( Figs 90b–g View Figure ) Giant diactines, nail-shaped triactines, large triactines with long unpaired actines, small tri- and tetractines with short unpaired actines.

Giant and smaller diactines ( Figs 90b View Figure ), fusiform, curved, 105– 869 – 2520 x 7.5– 37.1 –84 µm.

Nail-shaped triactines ( Figs 90c,c View Figure 1 View Figure ), fusiform, with one end poined and the opposite end with two tiny actines, usually more or less symmetrical; unpaired actine 252– 503 –781 x 8.5– 9.9 –12 µm, paired actines 3– 6.8 – 15 x 2.5– 4.2 –6 µm.

Triactines with long unpaired actines and flaring paired actines ( Fig. 90d View Figure ); unpaired actines 292– 348 –384 x 10 – 17.8 –24 µm, paired actines 226– 297 –342 x 9 – 18.4 –23 µm.

Tetractines ( Fig. 90e View Figure ), with short unpaired actines and straight paired actines; unpaired actines 31– 49 – 61 x 8 – 10.3 –12 µm, paired actines 69– 192 –231 x 8 – 11.6 –14 µm, apical actines 3– 25 – 32 x 3 – 7.9 –10 µm.

Triactines ( Fig. 90f View Figure ), with short unpaired actines and straight paired actines; unpaired actines 30– 46 – 63 x 7 – 10.3 –12 µm, paired actines 71– 188 –234 x 8 – 10.9 –12 µm.

Distribution and ecology. Seychelles, shallow-reef locality.

Remarks. Although this specimen shares the possession of atrial tetractines with Kebira tetractinifera  sp.nov., it shares also features with K. uteoides  such as a dense layer of tangential diactines, twice as long as those of K. tetractinifera  sp.nov. Further research is necessary to establish the value of these features for distinction of additional taxa in Kebira  .

Unfortunately, our attempt to obtain a 28S sequence of the specimen failed.

ZMA

Universiteit van Amsterdam, Zoologisch Museum