Colossendeis Jarzynsky 1870

• Main Author: Staples, David A.
• Format: Text
• Language: unknown
• Published: Zenodo 2019
• Subjects: Biodiversity; Taxonomy; Animalia; Arthropoda; Pycnogonida; Pantopoda; Colossendeidae; Colossendeis; Ross Sea; Galapagos; Pacific; Indian; New Zealand; Hoek; Rendu; Percy; Sladen
• Online Access: https://dx.doi.org/10.5281/zenodo.5944904; https://zenodo.org/record/5944904

Colossendeis sp. Plate 5A, B Material examined . One specimen of indeterminate sex (NHMUK 2018.35), Southwest Indian Ridge, Coral Seamount, 41˚ 21.32.99' S, 42˚.55.033' E, ROV, 863 m, specimen JCO66-578, stn 4.9, parent 971, on dead coral rubble, 14 November 2011. Distribution. This genus is found world-wide in all deep-sea ocean basins. Remarks. The leg span of this specimen is about 276 mm. This specimen belongs to a group of morphologically similar species that collectively form the Colossendeis macerrima Wilson, 1881 complex. The four most confused species in the complex are C. macerrima , C. leptorhynchus Hoek, 1881, C. minor Schimkewitsch, 1893 and C. gardineri Carpenter, 1907. Probably no other group of pycnogonids has been subjected to such extensive analyses as have those belonging to this complex and yet remain without satisfactory resolution. The most recent analysis of these four species was by Bamber, (2002) who reviewed previous analyses by Stock (1974, 1984 and 1986) and he supported the independent status of the four species. Justification for their independent status was primarily based on proboscis shape, propodal sole spination and palp segment ratios. Bamber did not discuss the earlier work of Turpaeva, (1994) who determined that the ratios of palp segments within the macerrima complex changed and overlapped with age. Her observations supported the earlier findings of Fry and Hedgpeth, (1969) who concluded that owing to differential rates of growth between structures, relative proportions vary continuously through size ranges within species of Colossendeis . As a consequence of her analysis Turpaeva synonymised C. leptorhynchus with C. macerrima and C. gardineri with C. minor. The strongly-tapered proboscis of this specimen is suggestive of C. minor but based on my reexamination of the C. minor syntypes and the C. macerrima holotype, this species differs in respects which extend beyond regional differences and cause the specimen to not sit easily with any other members of the species complex. Rather than add to the confusion and assign yet another specimen on a tentative or provisional basis to a species in the C. macerrima complex I have left it undescribed. Despite the geographically discrete collection site, the specimen has been included in a morphological and molecular analysis of a large collection of specimens from southern Australia that fall into the species complex. Such analysis is too involved to form part of this paper and the findings of that analysis will be the subject of a separate paper. : Published as part of Staples, David A., 2019, Pycnogonids (Arthropoda, Pycnogonida) from the Southwest Indian Ridge, pp. 401-449 in Zootaxa 4567 (3) on page 430, DOI: 10.11646/zootaxa.4567.3.1, http://zenodo.org/record/2598945 : {"references": ["Wilson, E. B. (1881) Report on the Pycnogonida. Reports on the Results of dredging, under the supervision of Alexander Agassiz, along the east coast of the United States, during the summer of 1880, by the U. S. Coast Survey Steamer Blake, COMMANDER J. R. Bartlett, U. S. N., commanding. Bulletin of the Museum of Comprehensive Zoology, Harvard, 8 (12), 239 - 256.", "Hoek, P. P. C. (1881) Report on the Pycnogonida, dredged by HMS Challenger 1873 - 76. Reports of the Scientific Results of the Exploring Foyage of HMS Challenger, 3 (10), 1 - 167. https: // doi. org / 10.5962 / bhl. title. 13132", "Schimkewitsch, W. (1893) Reports on the dredging operations off the west coast of Central America to the Galapagos, to the west coast of Mexico, and in the Gulf of California, in charge of Alexander Agissiz, carried on by the U. S. Fish Commission Steamer \" Albatross \", during 1891, Lieut. Commander Z. L. Tanner, U. S. N., commanding. Compte-rendu sur les Pantopodes recueillis pendant les Explorations de l'Albatross en 1891. Bulletin of the Museum of comparative Zoology, Harvard, 25, (2), 27 - 43.", "Carpenter, G. H. (1907) Pycnogonida. The Percy Sladen Trust Expedition to the Indian Ocean. Transactions of the Linnean Society London, 2 (Zoology), 12 (1), 95 - 101.", "Bamber, R. N. (2002) Bathypelagic pycnogonids (Arthropoda, Pycnogonida) from the Discovery deep-sea cruises. Journal of Natural History, 36, 715 - 727.", "Stock, J. H. (1974) Pycnogonida from the continental shelf, slope, and deep-sea of the tropical Atlantic and East Pacific. Biological Results of the University of Miami Deep-Sea Expeditions, 108. Bulletin of Marine Science, 24 (4), 957 - 1092.", "Stock, J. H. (1984) The deep-water Pycnogonida of the Safari Cruises to the Indian Ocean. Bulletin du Museum nationale d'histoire naturelle, Paris, 4 e, Series 6, Section A, 3, 701 - 709.", "Stock, J. H. (1986) Pycnogonida from the Caribbean and the Straits of Florida. Bulletin of Marine Science, 38 (3), 399 - 441.", "Turpaeva, E. P. (1994) A new species of Colossendeis (Pycnogonida) and some remarks on morphological features of the species of the genus Colossendeis belonging to the complex \" macerrima \". Zoologichesky Zhurnal, 73 (9), 91 - 96.", "Fry, W. G. & Hedgpeth, J. W. (1969) Pycnogonida, 1: Colossendeidae, Pycnogonidae, Endeidae, Ammotheidae. The Fauna of the Ross Sea, Part 7. Memoirs of the New Zealand Oceanographic Institute, 49, 1 - 139."]}