Glyptelasma carinatum

• Main Author: Young, Paulo S.
• Format: Text
• Language: unknown
• Published: Zenodo 2001
• Subjects: Biodiversity; Taxonomy; Animalia; Arthropoda; Maxillopoda; Pedunculata; Poecilasmatidae; Glyptelasma; Glyptelasma carinatum; Galapagos; Pacific; New Zealand; Hoek; Fernandez; North Atlantic
• Online Access: https://dx.doi.org/10.5281/zenodo.4885222; https://zenodo.org/record/4885222

Glyptelasma carinatum (Hoek, 1883) (Figs 10C, D; 12) Poecilasma carinatum Hoek, 1883: 44, pl. 1, figs 8-10, pl. 2, fig. 1, pl. 7, figs 6-7. — Weltner 1895: 289; 1897: 243. — Gruvel 1902c: 157, pl. 17, figs 9-16; 1902d: 45, 49; 1905: 115, fig. 130. — Hoek 1907a: 4, pl. 1, fig. 1; 1908: 111; 1914: 4. — Gruvel 1920: 37. Megalasma (Glyptelasma) carinatum – Pilsbry 1907a: 93; 1907b: 416. — Calman 1918a: 401, figs 1-3; 1919: 370. — Barnard 1924: 54. — Zevina 1972: 61; 1982: 92, fig. 82. Poecilasma (Glyptelasma) carinatum – Nilsson-Cantell 1921: 258. Glyptelasma carinatum – Broch 1931: 32, fig. 11. — Southward 1998: 13. — Young 1999: 612, fig. 2a. 80° 60° 40° 20° 0° 20° 40° 60° 100° 60° 20° 0° 20° 60° 100° 140° 180° Megalasma carinatum – Ciurea et al. 1933: 14. — Hutchins 1952: 194. Non Megalasma carinatum – Foster 1978: 26, pl. 3b, fig. 12 (= Glyptelasma hamatum Calman). MATERIALEXAMINED. — SEAMOUNT 2, stn TS 267, 34°22.50’N, 30°22.50’W, 2225 m, 1 specimen, tl (cl) 21.2 (20.1) mm (MNHN Ci 2842). REMARKS Comparing the description of G. carinatum with that of G. hamatum (Calman 1918a, 1919), I list some differences in the external characters of the capitular plates as follows. G. hamatum has a scutum with the basal margin straight and forming a right or obtuse angle with the occludent margin whereas G. carinatum has its basal margin form- ing an even curve with the occludent margin. But the specimens of G. carinatum figured by Hoek (1907a) show the basal margin as described for G. hamatum by Calman (1919). Hoek’s figure from specimens taken by the Challenger Expedition (Hoek 1883) also has a straight basal margin forming an angle with the occludent margin. Calman (1918a) observed a well-marked umboapical ridge, curved and distant from the occludent margin for G. carinatum and in 1919 he observed a submarginal umbo-carinal ridge, straight or curved for G. hamatum. He noted a relation between the carinal and occludent margins of tergum of one-third to half for G. hamatum and only half for G. carinatum . Nilsson-Cantell (1928: fig. 11) figured a specimen of G. hamatum with a conspicuous apicobasal ridge and an angle between the occludent and basal margins of the scutum. Young (1999: 612) also observed an apicobasal ridge on the scutum of G. carinatum which was collected off the Brazilian coast. Dissecting all the Glyptelasma sampled I found a large number of G. hamatum but only one specimen of G. carinatum. I tried to observe the external characters of these two species to evaluate the differences cited by Calman (1918a, 1919) and others. All the specimens have an angle between the basal and occludent margins of the scutum (Fig. 10A, C). The scutum of G. carinatum did not have an apico-basal ridge, but rather a wellmarked lateral (Fig. 10A, C). Therefore the development of an apicobasal ridge on the scutum is variable in both species. The relationship of half between the carinal and occludent margins of the tergum of G. carinatum may change if more specimens are examined. I cannot observe any external character which could be used to separate these species. Certainly, the best character to separate both species is the number of filamentary appendages on the dorsal margin of the prosoma: G. carinatum has two rows of numerous fine and long filamentary appendages and G. hamatum has only two short projections, which Calman (1919: 372) named dorsal hooks (Fig. 10B, D). G. carinatum and G. hamatum were collected at the same station on the axes of gorgonians. The general distribution of both species of Glyptelasma are similar: mainly North Atlantic and Indo- Malayan. Glyptelasma hamatum is also found from East Africa, south to Australia and New Zealand (Fig. 11) and G. carinatum from the South Atlantic, Japan and near the Galapagos Island (Fig. 12). : Published as part of Young, Paulo S., 2001, Deep-sea Cirripedia Thoracica (Crustacea) from the northeastern Atlantic collected by French expeditions, pp. 705-756 in Zoosystema 23 (4) on pages 720-723, DOI: 10.5281/zenodo.4689055 : {"references": ["HOEK P. P. C. 1883. - Report on the Cirripedia collected by H. M. S. Challenger during the years 1873 - 1876. Reports of the Scientific Results of the Voyage of H. M. S. Challenger, Zoology, part 25 8: 1 - 169, 13 pls.", "WELTNER W. 1895. - Die Cirripedien von Patagonien, Chile und Juan Fernandez. Archiv fur Naturgeschichte Berlin 61 (2): 288 - 292.", "WELTNER W. 1897. - Verzeichnis der bisher beschriebenen recenten Cirripedienarten. Mit Angabe der im Berliner Museum vorhandenen Species und ihrer Fundorte. ArchivfurNaturgeschichteBerlin 1 (3): 227 - 280.", "GRUVEL A. 1902 c. - Etude d'une espece nouvelle de Lepadides (Scalpellum giganteum, n. sp.) et de Poecilasma carinatum, Hoek. Transactions of the Linnean Society of London, 2 nd ser. Zoology 8: 153 - 161, pl. 17.", "HOEK P. P. C. 1907 a. - The Cirripedia of the Siboga Expedition. A: Cirripedia Pedunculata. Siboga Expeditie, Leiden 31 a: 1 - 127, pl. 1 - 10.", "GRUVEL A. 1920. - Cirrhipedes provenant des campagnes scientifiques de S. A. S. le Prince de Monaco. Resultats des Campagnes scientifiques accomplies sur son yacht par Albert Ier, Prince Souverain de Monaco 53: 1 - 89, pls 1 - 7.", "PILSBRY H. A. 1907 a. - The barnacles (Cirripedia) contained in the collections of the U. S. National Museum. Bulletin of the United States National Museum, Washington 60: 1 - 122, 11 pl.", "PILSBRY H. A. 1907 b. - Notes on the cirripeds genus Megalasma. Proceedings of the Academy of Natural Sciences of Philadelphia 59: 408 - 416, pl. 31.", "CALMAN W. T. 1918 a. - The type specimens of Poecilasma carinatum, Hoek (Cirripedia). Annals and Magazine of Natural History, series 9, 1: 401 - 408.", "BARNARD K. H. 1924. - Contributions to the crustacean fauna of South Africa. Cirripedia. Annals of the South African Museum, Cape Town 20 (1): 1 - 103.", "ZEVINA G. B. 1972. - Benthic Lepadomorpha (Cirripedia Thoracica) from the Southeast Pacific. Crustaceana, Leiden 22 (1): 39 - 63.", "ZEVINA G. B. 1982. - Barnacles of the suborder Lepadomorpha of the world ocean. II. Fauna SSSR, Leningrad 133: 1 - 222 (in Russian).", "BROCH H. 1931. - Papers from Dr Th. Mortensen's Pacific Expedition. 1914 - 1916. Indomalayan Cirripedia. Videnskabelige Meddelelser fra Dansk Naturhistorik Forening, Copenhagen 91: 1 - 146.", "SOUTHWARD A. J. 1998. - New observations on barnacles (Crustacea: Cirripedia) of the Azores region. Arquipelago. Life and Marine Sciences, Azores 16 (A): 11 - 27.", "YOUNG P. S. 1999. - The Cirripedia (Crustacea) collected by the RV Marion Dufresne along the Vitoria-Trindade seamounts (Brazil). Zoosystema 21 (4): 607 - 624.", "CALMAN W. T. 1919. - On barnacles of the genus Megalasma from deep-sea telegraph-cables. Annals and Magazine of Natural History, series 9, 4: 361 - 374.", "CIUREA J., MONOD T. & DINULESCO G. 1933. - Presence d'un Cirripede Opercule sur un poisson dulceaquicole europeen. Bulletin de l'Institut oceanographique, Monaco 615: 1 - 32.", "HUTCHINS L. W. 1952. - Species recorded from fouling, in Marine Fouling and its Prevention. U. S. Naval Institute, Annapolis: 165 - 207.", "FOSTER B. A. 1978. - The marine fauna of New Zealand: Barnacles (Cirripedia: Thoracica). Memoirs, New Zealand Oceanographic Institute, Wellington 69: 1 - 160."]}