Hexelasma velutinum Hoek 1913
Description
Hexelasma velutinum Hoek, 1913
Figures 2 I, 29, 30
Hexelasma velutinum Hoek, 1913: 246, pl. 26 figs 1–6. — Broch, 1931: 53. — Hiro, 1933: 70, pl. 3 fig. 2. — Utinomi, 1968: 30. — Newman & Ross, 1971:155. — Newman & Ross, 1976: 46. — Jones, 2000: 273, fig. 64, tabs 28–31. — Liu & Ren, 2007: 328, fig. 146.
Material examined. CEL-BB-102, 1 specimen, Stn. CP371 (24º28.521’N, 122º12.821’E, 26 Aug. 2006, depth: 582–613 m), BD 13.88 mm.
Diagnosis. Shell with 6 compartmental plates; carina, carinolateral and lateral plates with alae, radii absent; rostrum with radii and alae absent; parietes solid, longitudinal ribs on inner surface absent; basis membranous; intermediate segments of cirri IV–VI bearing 2 pairs of long setae.
Description. Shell white, conical or cylindrical, operculum large; shell surface with parallel growth lines, covered by membrane with fine, short setae (Fig. 2 I); 6 compartmental plates; carina, carinolateral and lateral plates with alae, radii absent; rostrum with radii and alae absent (Fig. 2 I); parietes solid, longitudinal ribs on inner surface absent; basis membranous; scutum triangular, occludent margin straight, with large teeth, tergal margin straight; tergum narrow, scutal margin long, straight, basiscutal angle oblique, spur pronounced. Maxilla subtriangular (Fig. 29 A), inferior and superior margins setose; maxillule with cutting edge notched, 2 long, cuspidate setae above notch, 3 fine short setae in notch, 12 fine setae below notch (Fig. 29 B); mandible with 4 teeth, first separated from remainder (Figs 29 C, G), lower margin smooth (Fig. 29 E), inferior angle sharp (Fig. 29 E); mandibular palp rectangular, apex blunt, dense setae on superior margin and distally (Fig. 29 D); labrum concave, deep notch absent, cutting edge with fine bidentate and tridentate teeth (Fig. 29 H). Cirrus I with rami unequal, outer ramus shorter, 11 segmented, inner ramus longer 11-segmented (Fig. 30 A); cirrus II with rami subequal, outer ramus 14-segmented, inner ramus 13-segmented (Fig. 30 B); cirrus III with rami subequal, outer ramus 37-segmented, inner ramus 43-segmented (Fig. 30 C); intermediate segments of cirri IV–VI with 2 pairs of long setae (Fig. 30 D).
Distribution. South China Sea, Japan, Taiwan and the Philippines.
Remarks. This is a new record for Taiwanese waters.
Other
Published as part of Chan, Benny K. K., Prabowo, Romanus Edy & Lee, Kwen-Shen, 2010, North West Pacific deep-sea barnacles (Cirripedia, Thoracica) collected by the TAIWAN expeditions, with descriptions of two new species, pp. 1-47 in Zootaxa 2405 on page 41, DOI: 10.5281/zenodo.194179Files
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Linked records
Additional details
Identifiers
Biodiversity
- Family
- Bathylasmatidae
- Genus
- Hexelasma
- Kingdom
- Animalia
- Order
- Sessilia
- Phylum
- Arthropoda
- Scientific name authorship
- Hoek
- Species
- velutinum
- Taxon rank
- species
- Taxonomic concept label
- Hexelasma velutinum Hoek, 1913 sec. Chan, Prabowo & Lee, 2010
References
- Hoek, P. P. C. (1913) The Cirripedia of the Siboga Expedition. B. Cirripedia Sessilia. Siboga-Expeditie Monographe, 31 b, 129 - 275.
- Broch, H. (1931) Papers from Dr. Th. Mortensen's Pacific Expedition 1914 - 1916, LVI. Indomalayan Cirripedia. Videnskabelige Meddelelser fra Dansk Naturhistorisk Forening i Kobenhavn, 91, 1 - 146.
- Hiro, F. (1933) Report on the Cirripedia collected by the surveying ships of the Imperial Fisheries Experimental Station on the continental shelf bordering Japan. Records of the Oceanographic Works in Japan, 5, 11 - 84.
- Utinomi, H. (1968) A revision of the deep-sea barnacles Pachylasma and Hexelasma from Japan, with a proposal of new classification of the Chthamalidae (Cirripedia, Thoracica). Publications of the Seto Marine Biological Laboratory, 16, 21 - 39.
- Newman, W. A. & Ross, A. (1971) Antarctic Cirripedia. Monographic account based on specimens collected chiefly under the United States Antarctic Research Program, 1962 - 1965. Antarctic Research Series, 14, 1 - 257.
- Newman, W. A. & Ross, A. (1976) Revision of the balanomorph barnacles; including a catalog of the species. Memoirs of the San Diego Society of Natural History, 9, 1 - 108.
- Jones, D. S. (2000) Crustacea Cirripedia Thoracica: Chionelasmatoidea and Pachylasmatoidea (Balanomorpha) of New Caledonia, Vanuatu and Wallis and Futuna Islands, with a review of all currently assigned taxa. In: A. Crosner (ed.), Resultats des Campagnes MUSORSTOM, Volume 21. Memoires de Museum national d'Histoire naturelle, 184, 141 - 283.
- Liu, R. Y. & Ren, X. Q. (2007) Fauna Sinica. Invertebrata. Vol. 42 Crustacea Cirripedia Thoracica. Science Press, Beijing, China. 633 pp.