Schneider, Craig W.

Wynne, Michael J.

English

Trinity College

Trinity College Trinity College Digital Repository Faculty Scholarship 1-2022 A correction of the type of Dictyota jamaicensis W.R.Taylor (Dictyotaceae, Phaeophyceae, Ochrophyta) Michael J. Wynne University of Michigan - Ann Arbor Craig W. Schneider Trinity College, craig.schneider.1@trincoll.edu Follow this and additional works at: https://digitalrepository.trincoll.edu/facpub  Part of the Biology Commons                                       No. 222 (13 January 2022) ISSN 2009-8987  Page 1 of 3 Copyright: © 2022 The authors. Open access article distributed under Creative Commons Attribution License CC BY-NC.  	A correction of the type of Dictyota jamaicensis W.R.Taylor (Dictyotaceae, Phaeophyceae, Ochrophyta)  Michael J. Wynne, University of Michigan Herbarium, Ann Arbor, Michigan 48108, USA (correspondence: mwynne@umich.edu)  Craig W. Schneider, Department of Biology, Trinity College, Hartford, Connecticut 06106, USA  In his comprehensive flora of marine algae of the tropical and subtropical western Atlantic Ocean, William Randolph Taylor (1895–1990) described a dozen new taxa of green, brown, and red algae (Taylor 1960). These included two brown algal species with the same epithet from their type localities in Jamaica, Dictyota jamaicensis W.R.Taylor and Dictyopteris jamaicensis W.R.Taylor. The description of Dictyota jamaicensis (Taylor 1960: 223, 630, pl. 32: figs 4, 5) stated (p. 631, Latin description) that the type locality was “Christofers Cove, Drax Estates, in Paroecia St. Ann, in colonia Jamaicae legit W.R. Taylor, num. 56-227, 20 iii 1956 in herbariis Taylorii et Universitatis (isotypus)”. The “plantae typicae”, effectively the holotype, were deposited in the personal herbarium of W R. Taylor and an isotype was deposited in the herbarium of the University of Michigan (MICH). The personal herbarium of W.R. Taylor was subsequently incorporated into MICH in the 1980s, and thus both specimens now reside there.   The description of Dictyopteris jamaicensis stated that the type locality was at 40 m depth near “Hellshire Hills… in Paroecia St. Catherine, in colonia Jamaicae” [Saint Catherine Parish, Jamaica]. Likewise, this was a Taylor collection, cited as no. WRT 56-227, 20.iii.1956, the type being deposited in the personal herbarium of W.R. Taylor with one isotype being deposited in MICH and a second in the “Musei Scientiarum … Institutum Jamaicensis, in loco Kingston, Jamaica”, now the Natural History Museum of Jamaica (IJ).   Taylor’s original determination of his Dictyota collection was Dictyota ciliolata Kützing before he regarded it as representing the new species Dictyota jamaicensis. The original identification of his other taxon with the same epithet in Taylor (1960: 631) was Dictyopteris membranacea Batters [presently known as D. polypodioides (De Candolle) J.V.Lamouroux, the generitype], but he later treated it as the new species Dictyopteris jamaicensis.  What appears to have gone unnoticed since is that the same date and collection number provided in Taylor’s descriptions of these two species is that they were published with the same collection number, WRT 56-227, and same date, namely, 20 March 1956. Although both De Clerck (2003) and Tronholm et al. (2013) incorrectly refer to the type and holotype, respectively, of Dictyota jamaicensis as being MICH 29205, Taylor’s personal herbarium accession number prior to when he transferred his herbarium to MICH.   The purpose of this note is resolve this confusion. The intended holotype of Taylor’s Dictyota jamaicensis from Christofers Cove, Jamaica, has been located in MICH (Fig. 1), with a barcode number of MICH 620000. This specimen shows Taylor’s correct collection no. as WRT 56-56 and its date to be 25 February 1956. According to ICN Art. 9.2 (Turland et al. 2018), if there are errors in the designation of a holotype in the protologue of a taxon such as locality, date, collector, collecting number, herbarium code, specimen identifier or citation of an illustration, these errors should be corrected provided that the intent of the original author is not changed.  The taxonomic status of Dictyota jamaicensis has long been uncertain. For example, Dawson (1962), and later Hörnig et al. (1992) and De Clerck (2003), questioned whether it could be                                       No. 222 (13 January 2022) ISSN 2009-8987  Page 2 of 3 Copyright: © 2022 The authors. Open access article distributed under Creative Commons Attribution License CC BY-NC.  	distinguished from Dictyota crenulata J.Agardh (Agardh 1847: 7; type locality: San Agustín, Oaxaca, Pacific Mexico). However, in a later investigation using gene-sequence evidence, Tronholm et al. (2013) concluded that what had been called D. crenulata is comprised of at least four species and that D. crenulata sensu stricto was restricted to the coast of Pacific Central America, and Dictyota jamaicensis was reinstated as a species with a tropical amphi-Atlantic distribution. Tronholm et al. (2013) went on to separate two other species from D. crenulata sensu lato, namely, Dictyota canariensis (Grunow) Tronholm and the new species Dictyota pleiacantha Tronholm, both of these latter species with a range in Macaronesia of the eastern North Atlantic. Later, Lozano-Orozco et al. (2014) reported the occurrence of D. canariensis from Veracruz, Mexico. Thus, Dictyota jamaicensis has been reinstated as a species in the western Atlantic (Wynne, 2017; Gabriel & Fredericq, 2019; Ballantine et al., 2021).  Agardh, J.G. (1847). Nya alger från Mexico. Öfversigt af Kongl. Vetenskaps-Adademiens Förhandlingar, Stockholm 4: 5–17. Ballantine, D.L., Norris, J.N. & Ruiz, H. (2021). The marine benthic algal flora of Puerto Rico, I. Ochrophyta: Phaeophyceae, Pelagophyceae, and Xanthophyceae. Smithsonian Contributions to Botany 114: [i]–vi, [1]–114, 78 figs. Dawson, E.Y. (1962). Additions to the marine flora of Costa Rica and Nicaragua. Pacific Naturalist 3: 375–395, 5 pls. De Clerck, O. (2003). The genus Dictyota in the Indian Ocean. Opera Botanica Belgica 13: 1–205, 54 figs, 12 tables. Gabriel, D. & Fredericq, S. (2019). The marine macroalgae of Cabo Verde archipelago: an updated checklist. Arquipélago, Life and Marine Science 39: 39–60. Hörnig, I., Schnetter, R. & Prud’homme van Reine, W.F. (1992). The genus Dictyota (Phaeophyceae) in the North Atlantic. I. A new generic concept and new species. Nova Hedwigia 54: 45–62, 6 figs, 3 tables. Lozano-Orozco, J.G., Sentíes, A., Díaz-Larrea, J., Pedroche, F.F. & de Clerck, O. (2014). The occurrence of Dictyota canariensis (Dictyotales, Phaeophyceae) in the Gulf of Mexico. Botanica Marina 57(5): 359–365, 9 figs, 2 tables. Suárez, A.M., Martínez-Daranas, B. & Alfonso, Y. (2015). Macroalgas marinas de Cuba. pp. [1]–264, 229 figs. La Habana [Havana]: UH [Universidad de La Habana] Editorial. Taylor, W.R. (1960.)  Marine algae of the eastern tropical and subtropical coasts of the Americas. pp. [i]–xi, 1–870, 14 figs, 80 pls. Ann Arbor: The University of Michigan Press.  Tronholm, A., Afonso-Carrillo, J., Sanson, M., Leliaert, F., Fernández-Garcia, C. & De Clerck, O. (2013). Taxonomy of the Dictyota ciliolata-crenulata complex (Dictyotales, Phaeophyceae). Phycologia 52 (2): 171–181, 45 figs, 1 table. Turland, N.J., Wiersema, J.H., Barrie, F.R., Greuter, W., Hawksworth, D.L., Herendeen, P.S., Knapp, S., Kusber, W.-H., Li, D.-Z., Marhold, K., May, T.W., McNeill, J., Monro, A. M., Prado, J., Price, M. J. & Smith, G.F. (eds.) (2018). International code of nomenclature for algae, fungi, and plants (Shenzhen Code) adopted by the Nineteenth International Botanical Congress Shenzhen, China, July 2017. Regnum Vegetabile 159. Glashütten: Koeltz Botanical Books. Wynne, M.J. (2017). A checklist of benthic marine algae of the tropical and subtropical western Atlantic: fourth revision. Nova Hedwigia Beiheft 145: 1–202, 2 tables. Wysor, B. & De Clerck, O. (2003). An updated and annotated list of marine brown algae (Phaeophyceae) of the Caribbean coast of the Republic of Panama. Botanica Marina 46: 151–160, 17 figs.                                         No. 222 (13 January 2022) ISSN 2009-8987  Page 3 of 3 Copyright: © 2022 The authors. Open access article distributed under Creative Commons Attribution License CC BY-NC.  	 Fig. 1. Holotype of Dictyota jamaicensis W.R.Taylor [MICH 620000].  

A correction of the type of Dictyota jamaicensis W.R.Taylor (Dictyotaceae, Phaeophyceae, Ochrophyta)

https://digitalrepository.trincoll.edu/cgi/viewcontent.cgi?article=1327&context=facpub

A correction of the type of Dictyota jamaicensis W.R.Taylor (Dictyotaceae, Phaeophyceae, Ochrophyta)

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