Penetrantia taeanata Seo & Chae & Winston & Z��gor��ek & Gordon 2018, n. sp

Autor: Seo, Ji-Eun, Chae, Hyun Sook, Winston, Judith E., Z��gor��ek, Kamil, Gordon, Dennis P.
Rok vydání: 2018
Předmět:
DOI: 10.5281/zenodo.5961772
Popis: Penetrantia taeanata n. sp. (Figs 9C���F, 12, 13) Spathipora [sp.]: Seo et al. 2016: 9. Penetrantia [sp.]: Seo et al. 2016: 9. Etymology. The species is named for the Taean Coast area of the Yellow Sea where it was discovered. Material examined. Holotype: MBRBKH8, Cheongpodae, Taean Coast National Park, Korean east coast, 36.6334�� N, 126.2997�� E, intertidal, 16 June 2017. Paratype: MBRBKP8, same data as holotype. Description. Colonies boring into mollusk shells, composed of linked kenozooidal stolons which penetrate upper layers of shell, sometimes reaching surface as series of tiny elevated pores (tubulets), and buried saclike zooids, with rounded orifices at shell surface usually on both sides of stolon branches (Figs 9C���F, 13B���C). Main stolon branches develop side branches at almost 90�� angles to principal stolons. Side branches larger than stolonate processes of Immergentia, about 15���20 ��m wide (Fig. 13D, E). On shell surface, well-preserved colony borings look like narrow branching tracks with round to teardrop-shaped orifice holes on either side; densest colonies appear as jumble of closely spaced holes. Zooids tubular with roundly tapering proximal ends; c. 140���180 ��m long, 50 ��m wide, budding at distal ends from peduncles, perpendicular or diagonal to shell surface. Although orifices on both sides of stolon at shell surface may appear to be almost opposite each other, the resin cast shows they are offset, sometimes in a very neat herringbone fashion (Figs 9C, D, 12B, D, 13A). Gonozooids not seen. Remarks. Our specimens resemble those of Penetrantia densa Sil��n, 1946 in the presence of the round apertures of zooids outside the line of the main stolon or branches, but zooids are smaller and openings can be even closer together in Penetrantia taeanata n. sp., which is the commonest boring ctenostome species at the intertidal site at Cheongpodae. Immergentia cheongpodensis n. sp. is less abundant at the same locality, but overall about one-third of the dead shell material collected at this site had borings of one or both species. They were most commonly found in bivalves, particularly oyster shells, but also noted in a few gastropod shells. Distribution. Korea: Cheongpodae, Yellow Sea.
Published as part of Seo, Ji-Eun, Chae, Hyun Sook, Winston, Judith E., Z��gor��ek, 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 269, DOI: 10.11646/zootaxa.4486.3.3, http://zenodo.org/record/1453233
{"references":["Seo, J. E., Woss, E. & Gordon, D. P. (2016) Woosuk University hosts bryozoology visits. International Bryozoology Association Bulletin, 12 (3), 9 - 10.","Silen, L. (1946) On two new groups of Bryozoa living in the shells of molluscs. Arkiv for Zoologi, 38 B, 1 - 7."]}
Databáze: OpenAIRE
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