Leucandra pilula Van & De 2018, sp.nov.
Leucandra pilula sp.nov. Figs 58a–g, 59a–e Material examined. Holotype, ZMA Por. 10528, Seychelles, Bird Island, 3.7167°S 55.2167°E, coastal reef at 13 m depth, scuba, coll. W. Kolvoort, field nr. NIOP-E stat. 717/34, 20 December 1992. Paratypes, ZMA Por. 10379a, Seychelles, Mahé, E coast, N of Moye...
| Main Authors: | , |
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| Format: | Other/Unknown Material |
| Language: | unknown |
| Published: |
2018
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| Subjects: | |
| Online Access: | https://zenodo.org/record/5966738 https://doi.org/10.5281/zenodo.5966738 |
| Summary: | Leucandra pilula sp.nov. Figs 58a–g, 59a–e Material examined. Holotype, ZMA Por. 10528, Seychelles, Bird Island, 3.7167°S 55.2167°E, coastal reef at 13 m depth, scuba, coll. W. Kolvoort, field nr. NIOP-E stat. 717/34, 20 December 1992. Paratypes, ZMA Por. 10379a, 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; ZMA Por. 10641 (2 specimens), Seychelles, Amirantes, St. François Atoll, Île Bijoutier, depth 3 m, reef, scuba, coll. R.W.M. van Soest, field nr. NIOP-E stat. 792/21, 6 January 1993; ZMA Por. 11564, Seychelles, Amirantes, N of Platte Island Atoll, 5.8167°S 55.3667°E, depth 6 m, reef, coll. R.W.M. van Soest, field nr. NIOP-E stat. stat. 796/42, 7 January 1993. Description. Small white or beige-white globules (Figs 58a–d), with a single apical oscule, flush with the surface, which is optically smooth but feels rough. Size of body up to 1.5 cm high, 1 cm in diameter; oscule 2–3 mm in diameter. In preservation they stay white. Consistency firm. Aquiferous system. Leuconoid. Skeleton. (Figs 58e–g) Cortical skeleton (Fig. 58f) of intermediate sized triactines overlying a mass (Fig. 58e) of giant and smaller triactines forming the choanosomal skeleton supporting the leuconoid aquiferous canal system. The atrial skeleton (Fig. 58g) consists of sagittal triactines and tetractines, the latter with apical actines protruding into the atrial lumen. The oscular rim is supported by trichoxeas. Spicules. (Figs 59a–e) Giant triactines, oxhorn-shaped triactines, small triactines, tetractines, trichoxeas. Giant triactines (Figs 59a) of the main body wall, actines straight, tapering gradually to sharp points, equiangular and equiradiate or more often sagittal or with all actines of different lengths, 312– 628 –985 x 19 – 55.7 –93 µm. Oxhorn triactines (Figs 59b) of the cortical skeleton, sagittal with curved paired actines and straight unpaired actines, unpaired actines 178– 245 –326 x 15 – 22.7 –31 µm, ... |
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