Rhabdocalyptus dawsoni

• Main Author: Reiswig, Henry M.
• Format: Text
• Language: unknown
• Published: Zenodo 2020
• Subjects: Biodiversity; Taxonomy; Animalia; Porifera; Hexactinellida; Lyssacinosida; Rossellidae; Rhabdocalyptus; Rhabdocalyptus dawsoni; Bering Sea; Canada; Pacific; British Columbia; Hercules; Nautilus; Cape Spencer; Alaska; Glass sponges
• Online Access: https://dx.doi.org/10.5281/zenodo.3703942; https://zenodo.org/record/3703942

Rhabdocalyptus dawsoni (Lambe, 1893) (Fig. 6B) Limited Synonymy: Bathydorus dawsoni Lambe, 1893, 73; Rhabdocalyptus dawsoni Ijima, 1898, 54; Schulze, 1899, 54; Koltun, 1967, 103; Leys & Lauzon, 1998, 111; Rhabdocalyptus dawsoni dawsoni , Koltun, 1967, 103; Reiswig, 2018, 126. Acanthascus dawsoni , Dohrmann et al ., 2012, 12. Acanthascus (Rhabdocalyptus) dawsoni , Tabachnick, 2002, 1451; Dohrmann et al ., 2012, 12. Material examined. CAS 223595, col. no. NA085-052-A, E/ V Nautilus w ROVs Hercules & Argus, Cordell Bank, Calif., 38.11ºN, 123.66ºW. 2112.7 m, 09 Aug. 2017. Comparative material. Lectotype of Rhabdocalyptus dawsoni , here designated, NMC 1900-7061, col. G.M. Dawson, 1855. off mouth of Qualicum River, Vancouver Island, British Columbia, Canada, figured L. Lambe, 1893, Pl. IV, fig. 2. Description. The specimen was pendant from an attachment site on a steep wall as recorded in the frame grab of the collection video (Fig. 6B). The body was cylindrical, 26.3 cm long by 6.3 cm in diameter with sharply tapered ends. It was entirely covered by sediment and epifaua adherent to smooth prostal diactins and both smooth and thorned hypodermal pentactins. The distal half of the specimen was collected. Spicules of the specimen are fairly consistent with those of the lectotype of Rhabdocalyptus dawsoni, for example, tangential rays of hypodermalia are 1.0– 2.9 –5.5 (n = 18) mm here vs 0.9– 2.6 –4.1 (n = 35) mm in the lectotype and discoctaster diameter is 77- 103 -125 (n = 111) µm here vs 54– 66 –86 (n = 50) in the lectotype. Intact microdiscohexasters could not be found in the Cordell Bank specimen but small hexactine centers without terminal rays may be the remnants of them. In view of the agreements in spicules such as dermalia, atrialia and microscleres, it seems certain that the specimen belongs to the widespread species R. dawsoni . Distribution. The species Rhabdocalyptus dawsoni has a known distribution from southern California to Cape Spencer, Alaska and probably into the Bering Sea at depths of 10 to 437 m. The Cordell Bank specimen was collected well within the known geographic range but at 2112.7 m it is a major depth extension for the species. : Published as part of Reiswig, Henry M., 2020, Report of Cladorhiza bathycrinoides Koltun (Demospongiae) from North America and a new species of Farrea (Hexactinellida) among sponges from Cordell Bank, California, pp. 562-574 in Zootaxa 4747 (3) on page 570, DOI: 10.11646/zootaxa.4747.3.9, http://zenodo.org/record/3696283 : {"references": ["Lambe, L. M. (1893) On some sponges from the Pacific Coast of Canada and Behring Sea. Transactions of the Royal Society of Canada, 10 (IV), 67 - 78, pls. III-VI.", "Ijima, I. (1898) The genera and species of Rossellidae. Annotationes zoologicae Japonenses, 2, 41 - 55.", "Schulze, F. E. (1899) Amerikanische Hexactinelliden nach dem materiale der Albatross-Expedition. G. Fischer, Jena, 129 pp., 19 pls. https: // doi. org / 10.5962 / bhl. title. 85189", "Koltun, V. M. (1967) Vitreous sponges of the Northern and Far-Eastern Seas of the USSR. Opredeliteli po faune SSSR, 94, 1 - 124. [in Russian]", "Reiswig, H. (2018) Four new species of Hexactinellida (Porifera) and a name replacement from the NE Pacific. Zootaxa, 4466 (1), 124 - 151. https: // doi. org / 10.11646 / zootaxa. 4466.1.11", "Dohrmann, M., Haen, K., Lavrov, D. & Worheide, G. (2012) Molecular phylogeny of glass sponges (Porifera, Hexactinelllida): increased taxon sampling and inclusion of the mitochondrial protein-coding gene, cytochrome oxidase subunit I. Hydrobiologia, 687, 11 - 20. https: // doi. org / 10.1007 / s 10750 - 011 - 0727 - z", "Tabachnick, K. R. (2002) Family Rossellidae Schulze, 1885. In: Hooper, J, & Van Soest, R. (Eds.), Systema Porifera: A Guide to the Classification of Sponges. Klewer Academic / Plenum Publishers, New York, pp. 1441 - 1505. https: // doi. org / 10.1007 / 978 - 1 - 4615 - 0747 - 5 _ 148"]}