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A Revision of Ophidiaster Davidsoni Foss. Rec., 23, 141–149, 2020 https://doi.org/10.5194/fr-23-141-2020 © Author(s) 2020. This work is distributed under the Creative Commons Attribution 4.0 License. A revision of Ophidiaster davidsoni de Loriol and Pellat 1874 from the Tithonian of Boulogne (France) and its transfer from the Valvatacea to the new forcipulatacean genus Psammaster gen. nov. Marine Fau1, Loïc Villier2, Timothy A. M. Ewin3, and Andrew S. Gale3,4 1Department of Geosciences, University of Fribourg, Chemin du Musée 6, 1700 Fribourg, Switzerland 2Centre de Recherche en Paléontologie – Paris, Sorbonne Université, 4 place Jussieu, 75005 Paris, France 3Department of Earth Sciences, The Natural History Museum London, Cromwell Road, South Kensington, London, UK, SW7 5BD, UK 4School of Earth and Environmental Sciences, University of Portsmouth, Burnaby Building, Burnaby Road, Portsmouth, PO13QL, UK Correspondence: Marine Fau ([email protected]) Received: 20 April 2020 – Revised: 20 June 2020 – Accepted: 23 June 2020 – Published: 28 July 2020 Abstract. Forcipulatacea is one of the three major groups 1 Introduction of extant sea stars (Asteroidea: Echinodermata), composed of 400 extant species, but only known from fewer than 25 Asteroidea (starfish or sea stars) is one of the most diverse fossil species. Despite unequivocal members being recog- echinoderm clades with approximately 1900 extant species nized in the early Jurassic, the evolutionary history of this (Mah and Blake, 2012) and around 600 extinct species (Vil- group is still the subject of debate. Thus, the identifica- lier, 2006) However, the fossil record of Asteroidea is rather tion of any new fossil representatives is significant. We here scarce (e.g. Gale, 2011; Mah and Blake, 2012). It is generally reappraise Ophidiaster davidsoni de Loriol and Pellat 1874 accepted that all modern sea stars belong to a clade, called from the Tithonian of Boulogne, France, which was assigned Neoasteroidea, which originated during the Triassic (Blake, to another major extant group, the Valvatacea, and reas- 1987; Gale, 1987, 2011), with most modern lineages appear- sign it within a new forcipulatacean genus, Psammaster gen. ing in the Jurassic. Jurassic fossils are therefore essential to nov. Psammaster davidsoni gen. nov. possess key Forcipulat- understanding the initial diversification and evolutionary his- acea synapomorphies including compressed ambulacrals and tory of Asteroidea. adambulacrals and typical organization of the body wall and Forcipulatacea is one of the major clades within the arm ossicles. A phylogenetic analysis including Psammas- Neoasteroidea, comprising about 400 extant species (Mah ter davidsoni gen. nov. does not place it within any existing and Blake, 2012) and fewer than 25 extinct species. Forcip- forcipulatacean family. Instead, Psammaster davidsoni gen. ulatacea is one of the oldest clades of Neoasteroidea, with nov. exhibits a mix of plesiomorphic and derived characters the oldest fossils known from the Hettangian (Lower Juras- and is resolved as a sister clade to a large group including sic) of Switzerland and Germany (Blake, 1990). However, the Asteriidae, Stichasteridae, and Heliasteridae. Removal of the diversity of forcipulatacean taxa during the Jurassic and this species from the Ophidiasteridae means their oldest fos- their relationships with Triassic groups are still poorly un- sil representative now dates from the Santonian, Upper Cre- derstood. Some fossil taxa, for instance, have been attributed taceous. to extant families based on general resemblances (e.g. pres- ence of quadriserial ambulacral pores) rather than synapo- morphies (Gale, 2011). Here we re-appraise Ophidiaster davidsoni de Loriol and Pellat, 1874, from the Tithonian of Boulogne, France, demonstrating that this taxon does not belong to the genus Published by Copernicus Publications on behalf of the Museum für Naturkunde Berlin. 142 M. Fau et al.: A revision of Ophidiaster davidsoni de Loriol and Pellat 1874 Ophidiaster L. Agassiz, 1836 (order Valvatida), as originally 3 Materials and methods assigned by de Loriol and Pellat (1874). Using the phylo- genetic characters and matrix from Fau and Villier (2020), 3.1 Terminology we assess the phylogenetic position of Ophidiaster davidsoni within the Forcipulatacea. The combination of original char- The anatomical descriptions follow the terminology defined acters justifies the creation of a new genus, Psammaster. The in Fau and Villier (2018, 2020). We use the conventional purpose of this study is to reappraise Ophidiaster davidsoni terms for orientation of the specimen: abactinal (adoral) ver- de Loriol and Pellat, 1874 and place it in a phylogenetic con- sus actinal (oral), proximal versus distal, and radial versus text. adradial. In the literature, the size of an individual is com- monly given with the two measures “r” and “R”, with r cor- responding to the distance between the centre of the disc and 2 Geological settings the edge of the disc and R corresponding to the distance be- tween the centre of the disc and the arm tip. The specimens (Fig. 1) were first mentioned by Wright (1870), who used the name Ophidiaster david- 3.2 Phylogenetic analysis soni without providing any description or diagnosis of the new taxon. The species was subsequently described by de We used the matrix from Fau and Villier (2020) in order to Loriol and Pellat (1874), who further mentioned that the assess the phylogenetic position of Psammaster davidsoni fossils were collected by Bouchard-Chantereaux. A few gen. nov. within the Forcipulatacea. The character–taxon ma- years later, Wright’s fossil collection was purchased by trix is composed of 115 morphological characters coded for F. H. Butler, a fossil and minerals dealer from London. 32 taxa, in particular 29 extant forcipulataceans, P. david- The specimens were purchased by the Natural History soni, and two outgroups. The matrix was coded and opti- Museum London (NHMUK) on 28 May 1887 from Fran- mized after phylogenetic analysis using MESQUITE (Mad- cis Henry Butler. De Loriol and Pellat (1874) only illustrate dison and Maddison, 2018). In total, 53 characters, out of 115 one specimen, the lectotype (NHMUK PI E 53996), and are scored for Psammaster davidsoni gen. nov. (see Sup- therefore the second specimen purchased is considered a plement). A thorough description of all characters can be paralectotype (NHMUK PI E 1499). found in Fau and Villier (2020). As in the original analy- The fossils were identified as coming from the Portlandian sis by Fau and Villier (2020), all multistate characters were of Boulogne-sur-Mer (Hauts-de-France, France). De Loriol left unordered and treated with equal weight. The parsimony ∗ and Pellat (1874) suggested that the fossils were most likely analysis was performed with PAUP 4.0 (Swofford, 2002). from the “Portlandien supérieur”, between the Cap d’Alpreck and Ningles, by comparing the surrounding matrix (i.e. sand- 3.3 Systematic palaeontology stone). The upper Portlandian sandstones of this area were Class Asteroidea de Blainville, 1830 classified later as the “Grès des Oies Formation” (Townson and Wimbledon, 1979). The Portlandian is a local stage name Superorder Forcipulatacea Blake, 1987 formerly used in southern England and northern France and Forcipulatida largely corresponds to the internationally recognized Titho- Order Perrier, 1884 nian stage (Ogg et al. 2012). Most of the Gres des Oies Genus Psammaster gen. nov. Formation falls within the upper Tithonian Kerberites ker- berus zone (Townsend and Wimbledon, 1979). The Gres des Type species Oies Formation largely comprises fine glauconitic sands con- taining a benthonic fauna with rare ammonites that was de- Psammaster davidsoni (de Loriol and Pellat, 1874) posited in a shallow marine setting (Townsend and Wimble- Derivation of name don 1979). However, the upper part of the Gres des Oies Formation is comprised of a conglomerate overlain by hum- The prefix psammos, Ancient Greek for “sand”, was chosen mocky cross-stratified sands (MacDonald et al. 2006, fig. 2). in reference to the sandstone formation in which the type Thus the glauconitic sandstone matrix containing Psammas- species was found. ter davidsoni gen. nov. suggests that it is more likely to have originated from the lower or middle Grès des Oies Forma- Diagnosis tion. As for type species, by monotypy. Nomenclatural acts This publication and its nomenclatural acts were regis- tered at ZooBank on 29 June 2020, prior to publication. Foss. Rec., 23, 141–149, 2020 https://doi.org/10.5194/fr-23-141-2020 M. Fau et al.: A revision of Ophidiaster davidsoni de Loriol and Pellat 1874 143 Figure 1. The lectotype NHMUK PI E 53996, in (a) abactinal and (b) actinal views, and (c, d) the paralectotype NHMUK PI E 1499, representing at least two individuals preserved as three separate elements, (c) NHMUK PI E 1499 i, and (d) NHMUK PI E 1499 ii and iii. Scale bars: 1 cm. The LSID of the publication is urn:lsid:zoobank.org:pub: Diagnosis 6385EBA2-F315-4F69-8522-9AAA7E8EB9C4; that of the new genus is urn:lsid:zoobank.org:act: 9573D478-3053- Forcipulatacean asteroid with five parallel sided arms, 4A18-8C8B-FF95A8024708. rounded in cross section, and a small disc. Crossed shape ossicles, bearing numerous small acicular spines and a cen- Psammaster davidsoni (de Loriol and Pellat 1874) tral granular spine of the same length. Arms with two rows of marginal, one carinal, one abactinal, and three rows of acti- 1870 Ophidiaster davidsoni, Wright, p. 230, nomen nudum nal ossicles on each side. Adambulacral rows comprised of by lack of definition, description, or indication. alternating ossicles, one larger and one smaller, each bearing 1874 Ophidiaster davidsoni de Loriol and Pellat, p. 293, pl. three to four spines. XXVI, figs. 13–14. 1993 Ophidiaster ? davidsoni, Lewis, p. 60. 4 Description Type material The disc and the five arms are partially preserved in the lec- NHMUK PI E 53996, lectotype, and NHMUK PI E 1499, totype specimen (Fig. 1). The disc size is rather small r D paralectotype, from the Grès des Oies Formation, Tithonian 0:8 cm.
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