Nolella papuensis

Nolella cf. papuensis (Busk, 1886) (Fig. 8) Cylindroecium papuense Busk, 1886: 38, pl. 8, fig. 2. Nolella papuensis: Harmer 1915: 53, pl. 4, figs 10–20; Rho & Kim 1981: 61, pl. 4, figs 1, 2; Rho & Seo 1986: 33; Seo 2005: 283, pl. 14, fig. 23 Material examined. MBRBK 1705, 9 May 2017, Munseom Island offshore of Seogwipo Harbor, Jeju Island, 20 m. Description. Colony forming chain or network of narrow cylindrical zooids. Zooid tubes varying in length, straight to slightly curved, connected by very narrow stoloniform elongations; zooids brown, opaque, their cuticle covered by particles of sediment proximally (Fig. 8A, B), the distal ends of zooids usually lighter and more translucent (Fig. 8D), with fine annular rings and topped distally by the often-squared orifice (Fig. 8E, F). Mean zooid length 1.043 mm (range 0.97–1.09 mm, N = 3); zooid width, mean 0.186 mm (range 0.145–0.217, N = 3), no dilation in diameter at base. Tentacle crown equitentacled, tentacles thin, straightly held; the one tentacle crown that expanded in our study (Fig. 8C) had 12 tentacles. No evidence of reproduction in colonies found. Remarks. The muddy-looking cylindrical zooids of Nolella resemble tubes of polychaetes or amphipods, but their squared-off orifice is diagnostic, distinguishing them as belonging to Nolella. The zooids of the specimens collected in this study are shorter than the average for zooids of N. stipata recorded in Florida (2.1 x 1.8 mm zooid length and width) (Winston 1982) and Brazil (2.3 x 1.8 mm) (Vieira et al. 2014). Korean material collected previously and identified as Nolella papuensis had zooids 1.0– 2.8 mm long and 0.20–0.30 mm wide (Seo 2005). Harmer’s (1915) account of Nolella papuen sis from the Siboga Expedition reported considerable variability in zooid length depending on state of growth and/or regeneration, but able to attain almost 4 mm in height with a tentacle crown of c. 18 tentacles. Busk’s (1886) original description gave much smaller dimensions (1.3 x 0.10–0.11 mm). We believe the Korean specimens (all three from the South Sea), most closely approach N. papuensis. Embryos were lacking in our material, but embryos in colonies from other areas are brooded, several in a row, in the distal half of zooid tubes. Distribution. Indonesia, New Guinea. Korea: Goheung, South Sea; Seogwipo, Jeju Island; intertidal to 20 m.
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 264, DOI: 10.11646/zootaxa.4486.3.3, http://zenodo.org/record/1453233
{"references":["Busk, G. (1886) Report on the Polyzoa collected by H. M. S. Challenger during the years 1873 - 76. Part II. - The Cyclostomata, Ctenostomata, and Pedicellinea. Report on the Scientific Results of the Voyage of H. M. S. Challenger, Zoology, 17 [50], iviii, 1 - 47, 10 pls.","Harmer, S. F. (1915) The Polyzoa of the Siboga Expedition. Part 1. Entoprocta, Ctenostomata and Cyclostomata. Siboga- Expeditie, 28 a, i-vi, 1 - 180, pls 1 - 12.","Rho, B. J. & Kim, H. K. (1981) A study on the marine bryozoans in Korea 3. Stenolaemata and Gymnolaemata. Journal of Korean Research Institute for Better Living, 27, 57 - 80.","Rho, B. J. & Seo, J. E. (1986) A systematic study on the marine bryozoans in Cheju-do. Korean Journal of Zoology, 29, 31 - 60.","Seo, J. E. (2005) Bryozoa. Illustrated Encyclopedia of Fauna and Flora of Korea, 40, 1 - 596. [In Korean]","Winston, J. E. (1982) Marine bryozoans (Ectoprocta) of the Indian River area, Florida. Bulletin of the American Museum of Natural History, 173, 99 - 176.","Vieira, L. M., Migotto, A. E. & Winston, J. E. (2014) Ctenostomatous Bryozoa from Sao Paulo, Brazil, with descriptions of twelve new species. Zootaxa, 3889 (4), 485 - 524. http: // dx. doi. org / 10.11646 / zootaxa. 3889.4.2"]}