Echinoidea name details
original description
Mortensen, T. (1910). The Echinoidea of the Swedish South Polar Expedition. <em>Wissenschaftliche Ergebnisse der Schwedischen Südpolar Expedition 6/4.</em> 1-114., available online at https://www.biodiversitylibrary.org/page/6227595 page(s): 32-36; pl. 5: figs. 1-3, pl. 15: figs 1, 4-5, 7, 11, 14 [details]
basis of record
Mortensen, T. (1935). A Monograph of the Echinoidea. II. Bothriocidaroida, Melonechinoida, Lepidocentroida, and Stirodonta, 647 pp., C. A. Reitzel & Oxford University Press, Copenhagen & London. page(s): 580 [details]
redescription
Mortensen, T. (1941). Echinoderms of Tristan de Cunha. <em>Results Norwegian Scientific Expedition Tristan da Cunha 1937-38.</em> 7: 1-10. page(s): 7-8 [details] Available for editors
status source
Lessios, H. A., Lockhart, S., Collin, R., Sotil, G., Sanchez-Jerez, P., Zigler, K. S., Perez, A. F., Garrido, M. J., Geyer, L. B., Bernardi, G., Vaquier, V. D., Haroun, R. & Kessing, B. D. 2012. Phylogeography and bindin evolution in Arbacia, a sea urchin genus with an unusual distribution. Molecular Ecology 21, 130-144., available online at https://doi.org/10.1111/j.1365-294x.2011.05303.x page(s): 140 [details]
Present Inaccurate Introduced: alien Containing type locality
From editor or global species database
Status Lessios et al. (2012: p. 140) state that: "There seems to be little doubt that A. crassispina and A. dufresni are not separate species, as the two morphs are not distinct in the phylogeny of either the mitochondrial or the nuclear gene. The morphological differences between the two nominal species are so slight, that Clark (1925) questioned whether they could be maintained as separate species. Mortensen (1935 [p. 580]), the author of A. crassispina, agreed that it may be a local variety of A. dufresni, but then changed his mind (Mortensen 1941 [p. 7-8])." Although Lessios et al. (2012) do not formally synonymize the two species, the evidence presented for the identity of the two taxa seems very strong and they are thus treated as synonyms here.
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