Resolving the Ophioderma longicauda (Echinodermata: Ophiuroidea) cryptic species complex: five sisters, three of them new

Sabine Stöhr, Alexandra Anh-Thu Weber, Emilie Boissin, Anne Chenuil

Abstract


The conspicuous Mediterranean brittle star Ophioderma longicauda (Bruzelius, 1805) has been discovered to represent a cryptic species complex, consisting of six nuclear clusters with contrasting reproductive modes (broadcast spawners and brooders). Here, O. longicauda is re-described. It is distinguished by a dark reddish-brown colouration both dorsally and on the ventral disc, and multiple tumid dorsal arm plates. One eastern Mediterranean brooding cluster is described as O. zibrowii sp. nov., characterized by a dark olive-green colour both dorsally and on the ventral disc, and single dorsal arm plates. Another brooder is described from Tunisia as O. hybrida sp. nov., with a highly variable morphology that reflects its origin by hybridization of O. longicauda and a brooder (possibly O. zibrowii sp. nov.), leaving the third brooding cluster as morphologically indistinguishable at this point and possibly conspecific with one of the others. The West-African O. guineense Greef, 1882 is resurrected as a valid species, differing morphologically from O. longicauda by predominantly single dorsal arm plates and light green or creamy white ventral side. Also from West Africa, O. africana sp. nov. is described, characterized by a dark brown colour, dorsally and ventrally, and single dorsal arm plates.

Keywords


brittle stars; new species; morphology; Mediterranean Sea; West Africa

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DOI: https://doi.org/10.5852/ejt.2020.600

References


Boissin E., Stöhr S. & Chenuil A. 2011. Did vicariance and adaptation drive cryptic speciation and evolution of brooding in Ophioderma longicauda (Echinodermata: Ophiuroidea), a common Atlanto-Mediterranean ophiuroid? Molecular Ecology 22: 4737–4755. https://doi.org/10.1111/j.1365-294X.2011.05309.x

Boissin E., Hoareau T.B., Paulay G. & Bruggemann J.H. 2017. DNA barcoding of reef brittle stars (Ophiuroidea, Echinodermata) from the southwestern Indian Ocean evolutionary hot spot of biodiversity. Ecology and Evolution 7: 11197–11203. https://doi.org/10.1002/ece3.3554

Bruzelius N. 1805. Dissertatio sistens species cognitas asteriarum, quamr. sub praesidio D.M. and J. Retzii, pro laurea modeste exhibet Nicolaus Bruzelius. Berlingianis, Lund.

Chenuil A., Cahill A.E., Délémontey N., Du Salliant du Luc E. & Fanton H. 2019. Problems and questions posed by cryptic species. A framework to guide future studies. In: Casetta E., Marques da Silva J. & Vechhi D. (eds) From Assessing to Conserving Biodiversity: Conceptual and Practical Challenges. History, Philosophy and Theory of the Life Sciences 24: 77–106. Springer International Publishing, Cham. https://doi.org/10.1007/978-3-030-10991-2_4

Clark A.M. 1976. Ophiura Lamarck, 1801 and Ophioderma Müller & Troschel, 1840: revised proposals for stabilisation. Z.N.(S.) 1772. Bulletin of Zoological Nomenclature 32: 265–267.

Fenaux L. 1969. Le développement larvaire chez Ophioderma longicauda (Retzius). Cahier de Biologie marine 10: 59–62.

Fenaux L. 1972. Evolution saisonnière des gonades chez l’Ophiure Ophioderma longicauda (Retzius), Ophiuroidea. Internationale Revue der gesamten Hydrobiologie und Hydrographie 27: 257–262. https://doi.org/10.1002/iroh.19720570205

Greeff R. 1882. Echinodermen beobachtet auf einer Reise nach der Guinea-Insel São-Thomé. Zoologischer Anzeiger 107: 156–159.

Hendler G. 2018. Armed to the teeth: a new paradigm for the buccal skeleton of brittle stars (Echinodermata: Ophiuroidea). Contributions in Science 526: 189–311.

Hendler G., Miller J.E., Pawson D.L. & Kier P.M. 1995. Sea stars, sea urchins, and allies. Echinoderms of Florida and the Caribbean. Smithsonian Institution Press, Washington and London.

Koehler R. 1914. Echinoderma I. Asteroidea, Ophiuroidea et Echinoidea. In: Michaelsen E. (ed.) Beiträge zur Kenntnis der Meeresfauna Westafrikas Vol. 1: 127–303. L. Friederichsen & Co., Hamburg. https://doi.org/10.5962/bhl.title.7400

Landschoff J. & Griffiths C.L. 2015. Brooding behavior in the shallow-water brittle star Ophioderma wahlbergii. Invertebrate Biology 134: 168–179. https://doi.org/10.1111/ivb.12081

Madsen F.J. 1970. West African ophiuroids. Atlantidae Report 11: 151–243.

Melville R.V. 1980. Opinion 1152. Ophiura Lamarck, 1801 and Ophioderma Müller & Troschel, 1840 (Ophiuroidea): ruling on application of these names. Bulletin of Zoological Nomenclature 37 (2): 78–80.

Müller J. & Troschel F.H. 1840. Über die Gattungen der Ophiuren. Archiv für Naturgeschichte, Berlin 6: 326–330.

Stöhr S., Boissin E. & Chenuil A. 2009. Potential cryptic speciation in Mediterranean populations of Ophioderma (Echinodermata: Ophiuroidea). Zootaxa 2071: 1–20. https://doi.org/10.11646/zootaxa.2071.1.1

Stöhr S., O’Hara T.D. & Thuy B. 2019. World Ophiuroidea Database. World Register of Marine Species. Available from http://www.marinespecies.org/ophiuroidea [accessed 4 Sep. 2019]. https://doi.org/10.14284/358

Tortonese E. 1983. Remarks on the morphology and taxonomy of Ophioderma longicaudum (Retz.) from the Mediterranean. Atti della Societa Italiana di Scienze naturali e del Museo civico di Storia naturale in Milano 124: 21–28.

Weber A.A.-T., Abi-Rached L., Galtier N., Bernard A., Montoya-Burgos J.I. & Chenuil A. 2017.

Positive selection on sperm ion channels in a brooding brittle star: consequence of life-history traits evolution. Molecular Ecology 26: 3744–3759. https://doi.org/10.1111/mec.14024

Weber A.A.-T., Mérigot B., Valière S. & Chenuil A. 2015. Influence of the larval phase on connectivity: strong differences in the genetic structure of brooders and broadcasters in the Ophioderma longicauda species complex. Molecular Ecology 24: 6080–6094. https://doi.org/10.1111/mec.13456

Weber A.A.-T., Dupont S. & Chenuil A. 2013. Thermotolerance and regeneration in the brittle star species complex Ophioderma longicauda: a preliminary study comparing lineages and Mediterranean basins. Comptes Rendus Biologies 336: 572–581. https://doi.org/10.1016/j.crvi.2013.10.004

Weber A.A.-T., Stöhr S. & Chenuil A. 2014. Genetic data, reproduction season and reproductive strategy data support the existence of biological species in Ophioderma longicauda. Comptes Rendus Biologies 337: 553–560. https://doi.org/10.1016/j.crvi.2014.07.007

Weber A.A.-T., Stöhr S. & Chenuil A. 2019. Species delimitation in the presence of strong incomplete lineage sorting and hybridization: lessons from Ophioderma (Ophiuroidea: Echinodermata). Molecular Phylogenetics and Evolution 131: 138–148. https://doi.org/10.1016/j.ympev.2018.11.014

Ziesenhenne F.C. 1955. A review of the genus Ophioderma M. & T. In: Allan Hancock Foundation staff (eds) Essays in the Natural Sciences in Honour of Captain Alan Hancock: 185–201. Los Angeles University of Southern California Press, Los Angeles. https://doi.org/10.5962/bhl.title.6088


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