Alcyonidium pulposum Seo & Chae & Winston & Zágoršek & Gordon 2018, n. sp

Autor: Seo, Ji-Eun, Chae, Hyun Sook, Winston, Judith E., Zágoršek, Kamil, Gordon, Dennis P.
Rok vydání: 2018
Předmět:
DOI: 10.5281/zenodo.5961762
Popis: Alcyonidium pulposum n. sp. (Fig. 4) Etymology. Latin pulposu s, fleshy, alluding to the fleshy form of the colony. Material examined. Holotype: MBRBKH5, Yeonhwa-ri, Baengnyeong Island, 37.9461° N, 124.6267° E, intertidal, 18 May 2017. Paratype: MBRBKP5, same data as holotype. Description. Colony forming large, rubbery gelatinous creamy-yellow-brown masses that develop bulbous lobes of varied breadth and projecting irregular branches from encrusting base on algal stems or other cylindrical substrata (Fig. 3A); growth extending up to 14–15 cm long along stem. Zooids erect, irregular in size and shape, oval to hexagonal, frontal surface flat to slightly convex, with small round orifice that forms a little papilla when closed; zooid wall somewhat translucent, so that whitish shape of polypide can be discerned in deep body of cystid (Fig. 4B, C, E). Beneath outer layer of autozooids is firm gelatinous core that resists being cut (Fig. 4F). Zooid length, mean 0.363 mm (range 0.306–0.393, N = 6); zooid width, mean 0.258 mm (range 0.216–0.306, N = 6), orifice diameter, mean 0.087 mm (range, 0.072–0.208 mm, N = 6)). Kenozooids abundant (Fig. 4B–D). Some zooids contained clusters of yellow eggs or embryos (Fig. 4B, C). Remarks. None of the colonies collected expanded while observed, so that polypide characters could not be noted. The species is similar to Alcyonidium bullitum n. sp. in the presence of abundant kenozooids, but these are larger relative to zooid size than in A. bullitum This species shows similarities to Alcyonidium diaphanum (Hudson, 1778) from the Northeast Atlantic, but the lobes of the Korean species are larger and more rounded. Its closest relative may be Alcyonidium diaphanum alcilobatum d’Hondt & Mawatari, 1986 from Japanese Pacific localities and considered by them to be a new subspecies because of its geographic isolation from European populations. Its lobes are thinner and more leaf-like than those of A. pulposum n. sp., as shown in their paratype and holotype specimens (d’Hondt & Mawatari 1986, pl. 1, figs 1, 2). Colonies of A. pulposum n. sp. also lacked the small projecting bumps of incipient lobes seen in mature Belgian colonies of A. diaphanum illustrated by De Blauwe (2009, p. 43, figs 15, 16). Distribution. Yellow Sea: Yeonhwa-ri, Baengnyeong Island, where subtidal colonies were washing up in the surf zone.
Published as part of Seo, Ji-Eun, Chae, Hyun Sook, Winston, Judith E., Zágoršek, Kamil & Gordon, Dennis P., 2018, Korean ctenostome bryozoans-observations on living colonies, new records, five new species, and an updated checklist, pp. 251-283 in Zootaxa 4486 (3) on page 258, DOI: 10.11646/zootaxa.4486.3.3, http://zenodo.org/record/1453233
{"references":["Hudson, W. H. (1778) Flora Anglica, exhibens plantas per regnum Angli sponte crescents, distributas secundum systema sexuale: cum differentiis specierum, synonymis auctorum, nominibus incolarum, solo locorum, tempore florendi, officinalibus pharmacopaeorum. London, J. Nourse & C. Moran, xxxviii + 690 pp.","Hondt, J. - L. d' & Mawatari, S. F. (1986) Les Alcyonidium (Bryozoa, Ctenostomida) des cotes du Japon. Bulletin du Museum National d'Histoire Naturelle, 8 A, 457 - 469.","De Blauwe, H. (2009) Mosdiertjes van de Zuidelijke bocht van de Noordzee: Determinatiewerk voor Belgie en Nederland. Vlaams Instituut voor de Zee (VLIZ), Oostende, Belgium, 445 pp."]}
Databáze: OpenAIRE
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