Bunga payung
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Ordo: Alcyonacea
Familia: Arulidae
Genus: Bunga
Name
Bunga payung Lau & Reimer, 2019 sp. nov. – Wikispecies link – ZooBank link – Pensoft Profile
Material examined
All specimens are from Sepangar, Sepangar Island, Kota Kinabalu, Sabah, Malaysia (06°03'38.66"N, 116°04'0.65"E), 20 March 2018 and collected by YW Lau. Holotype: NSMT-Co 1679, 9 m depth. Paratype: IPMB-C 01.00017, 10 m depth.
Description
Colony with numerous polyps (total ~70). Polyps connected through stolons attached to rock. Stolons are thin and rounded (circular in cross-section, ~0.3 mm in diameter) and polyps are spaced apart irregularly, either adjacent to one another or spaced apart up to ~5 mm. Expanded polyps are ~2.2–3.0 mm in width and retract fully into calyces of ~1 mm wide and up to ~2 mm in height. Calyces do not retract into the stolon. The oral disk of the polyps is expanded into a circular membrane by fusion of proximal regions of adjacent tentacles (Figure 2a), as is characteristic of arulids. The oral disk has eight shallow furrows that run from intertentacular margin to mouth of polyp, dividing the membrane into eight lobes. The distal two-thirds of the tentacles extend from fused margins of the oral membrane. Tentacles with 6–10 pairs of widely spaced pinnules are arranged in a single row on either side of rachis.
Anthocodial sclerites are smooth rods, with simple tubercles at distal margin ends, 0.1–0.15 mm long (Figure 4a). Calyces contain table-radiates that range 0.06–0.19 mm in length (Figure 4b–d). Sclerites of the stolon are fused table-radiates forming a flat sheet (Figure 4e).
Polyps are brown coloured in life with a whitish oral disk, but yellowish white when preserved in ethanol. Zooxanthellate.
Morphological variation
The paratype is a colony consisting of ~10 polyps. Polyps of the paratype colony show variation in colouration; the whitish colour is not restricted to the oral disk but is also seen in the tentacles. This could be due to differences in sclerite density (Figure 2a), as described in Alderslade and McFadden (2007)[1] and Lau et al. (2019)[2], or it could be due to the position of zooxanthellae in the tissue.
Distribution
Sepangar Island, Kota Kinabalu, Sabah, Malaysia.
Remarks
Anthocodial rods are scarce in Bunga payung gen. nov. et sp. nov. The 6-radiate type of sclerite was not observed in this genus but is present in Arula and Hana, the two other genera in the family Arulidae.
Etymology
From the Malaysian and Indonesian word payung, which means umbrella; denoting the shape of the oral disc of the polyps, which resemble the shape of an umbrella.
Original Description
- Lau, Y; Reimer, J; 2019: A first phylogenetic study on stoloniferous octocorals off the coast of Kota Kinabalu, Sabah, Malaysia, with the description of two new genera and five new species ZooKeys, 872: 127-158. doi
Images
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Other References
- ↑ Alderslade P, McFadden C (2007) Pinnule-less polyps: a new genus and new species of Indo-Pacific Clavulariidae and validation of the soft coral genus Acrossota and the family Acrossotidae (Coelenterata: Octocorallia).Zootaxa1400: 27–44. https://doi.org/10.11646/zootaxa.1400.1.2
- ↑ Lau Y, Stokvis F, Imahara Y, Reimer J (2019) The stoloniferous octocoral, Hanabira yukibana, gen. nov., sp. nov., of the southern Ryukyus has morphological and symbiont variation.Contributions to Zoology88: 54–77. https://doi.org/10.1163/18759866-20191355
