Leucandrilla wasinensis ( Jenkin, 1908 )

Van, Rob W. M. & De, Nicole J., 2018, Calcareous sponges of the Western Indian Ocean and Red Sea, Zootaxa 4426 (1), pp. 1-160: 106

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-DC1B-A558-FF67-89B2FB86F81A

treatment provided by

Plazi

scientific name

Leucandrilla wasinensis ( Jenkin, 1908 )
status

 

Leucandrilla wasinensis ( Jenkin, 1908) 

Figs 64a–e View Figure , 65a–g View Figure .

Leucilla wasinensis Jenkin, 1908: 454  , figs 104A–B.

Leucandra wasinensis  ; Dendy 1913: 24, pl. 2 fig. 5.

(Not: Leuconia wasinensis  ; Burton 1959: 181 = Sycettusa cf. simplex  ).

Material examined. ZMAAbout ZMA Por. 11561, Seychelles, Amirantes, N of Poivre island, 5.7°S 53.3°E, depth 42–45 m, calcareous gravel bottomGoogleMaps  , 2.4 m Agassiz trawl, coll. R.W.M. van Soest, field nr. NIOP-E stat. 776/ 21, 31 December 1992.

Description. White, sycon-like sponge ( Fig. 64a View Figure ), with prominent fringe and hairy surface. Size 2 cm high, 1.2 cm in diameter, atrial lumen 1–2 mm in diameter. Consistency firm.

Aquiferous system. Leuconoid.

Skeleton. ( Figs 64b–e View Figure ) The cortical region ( Figs 64b–c View Figure ) consists of a layer of smaller triactines covering a layer of subcortical tetractines. The cortical skeleton is pierced by single giant diactines causing the hispidation. The main skeleton ( Fig. 64b,d View Figure ) contains a mass of large and small triactines, and some tetractines. The atrial skeleton ( Fig. 64d View Figure ) consists of smaller tri- and tetractines. The fringe ( Fig. 64e View Figure ) consists of a mixture of giant diactines, trichoxeas and sagittal tri– and tetractines.

Spicules. ( Figs 65a–g View Figure ) Triactines, tetractines, giant diactines, trichoxeas.

Large triactines ( Fig. 65a View Figure ), equiangular, usually slightly sagittal, actines 286– 340 –448 x 21 – 30.9 –38 µm.

Smaller cortical and choanosomal triactines ( Fig. 65b View Figure ), 210– 241 –279 x 18 – 25.5 –31 µm.

Smaller choanosomal and subatrial triactines ( Fig. 65c View Figure ), sagittal or irregular, unpaired actines 122– 170 –203 x 14 – 18.1 –22 µm, paired actines 63– 171 –249 x 12 – 16.4 –21 µm.

Large subcortical tetractines ( Figs 65d View Figure ), sagittal, unpaired actines 212– 389 –521 x 11 – 20.4 –26 µm, paired actines 116– 194 –252 x 10 – 17.6 –24 µm, apical actines 12– 49 – 66 x 4 – 5.9 –9 µm.

Small atrial tetractines ( Figs 65e View Figure ), sagittal, with curved paired actines, and straight or curved apical actines; unpaired actines 32– 97 –164 x 4 – 8.7 –14 µm, paired actines 49– 105 –136 x 4 – 8.4 –11 µm, apical actines 38– 61 –112 x 4 – 7.2 –10 µm.

Trichoxeas ( Fig. 65f View Figure ), straight, thin, invariably broken in the slides, fragments 200–515 x 2–5 µm.

Giant diactines ( Figs 65g View Figure ), curved, endings tapering to sharp points, 1390– 2072 – 2520 x 20 –52.3–62 µm.

Distribution and ecology. Seychelles, Wasini Island off Kenya, Saya de Malha, on gravelly bottom at greater depth (> 40 m). Burton (1959) reported Leuconia wasinensis  from the South Arabian region (38 m), but he did not provide a description. Its identity was re-examined and the record is reassigned here, see below.

Remarks. The specimen described above resembles previous descriptions of Jenkin (1908) and Dendy (1913) in most details. Jenkin’s material had the larger triactines up to 950 x 40 µm (in our material 448 x 38 µm). Likewise, the subcortical tetractines of Jenkin’s specimen were larger, up to 700 x 28 µm (ours 521 x 26 µm), and also the atrial tetractines were considerably larger than ours. Dendy’s (1913) decription lacks detailed spicule measurements, but he admits that the spicules of his specimen were ‘a good deal smaller’ than Jenkin’s. We assume here that spicule sizes are subject to variation.

Burton (1959) recorded this species (as Leuconia  ), but after re-examination this was found to be very similar to Sycettusa simplex ( Jenkin, 1908)  , see the Remarks of that species below.

Unfortunately, our attempt to obtain partial 28S sequences of this species failed.

ZMA

Universiteit van Amsterdam, Zoologisch Museum

Kingdom

Animalia

Phylum

Porifera

Class

Calcarea

Order

Leucosolenida

Family

Grantiidae

Genus

Leucandrilla

Loc

Leucandrilla wasinensis ( Jenkin, 1908 )

Van, Rob W. M. & De, Nicole J. 2018

2018
Loc

Leucilla wasinensis

: 454