Cylindracanthus sp. Leidy 1856

• Main Authors: Zouhri, Samir, Gingerich, Philip D., Khalloufi, Bouziane, Bourdon, Estelle, Adnet, Sylvain, Jouve, Stéphane, Elboudali, Najia, Amane, Ayoub, Rage, Jean-Claude, Tabuce, Rodolphe
• Format: Text
• Language: unknown
• Published: Zenodo 2021
• Subjects: Biodiversity; Taxonomy; Animalia; Chordata; Actinopterygii; Perciformes; Scombridae; Cylindracanthus; Cylindracanthus sp.; Sullivan; Parris; Grimsley; North Atlantic
• Online Access: https://dx.doi.org/10.5281/zenodo.4606622; https://zenodo.org/record/4606622

Cylindracanthus sp. EXAMINED MATERIAL. — FSAC Bouj-141, 356 (Fig. 5A), 357, 358, 359, 360, 361, 362, fragments of rostra. DESCRIPTION The rostra are incomplete and cylindrical. The external surface is crossed by sub-parallel longitudinal ridges, sometimes convergent. The cross-section is circular, with a notched circumference owing to the longitudinal ridges. A unique median canal lies in the center of the cross-section. REMARKS These remains are very common in Boujdour. The notched circular cross-section showing a canal and the fluted external surface correspond to the rostrum of Cylindracanthus . This genus is only known by these peculiar rostra, sometimes showing two rows of minute teeth. They are retrieved in various localities from the Cretaceous to Eocene (and possibly Miocene and Pliocene, see Schultz 1987) in Africa, Asia, Europe, and North and South America (Schultz 1987; Gallo et al. 2012; Averianov 2014; Grandstaff et al. 2017). Putative isolated vertebrae have also been reported but without anatomical connection with the rostrum, (Leriche 1910; White 1926). The phylogenetic relationships of Cylindracanthus are still discussed and affinities with chimaeroids, billfishes, dercetids, acipenseriforms and beloniforms have been proposed (Schultz 1987; Weems 1999; Parris et al. 2001; Monsch 2004; Friedman 2012; Bonde & Leal 2017) while Grandstaff et al. (2017) excluded structural resemblances with the billfish Makaira Lacepède, 1802 and the paddlefish Polyodon Lacepède, 1797 by analysing thin sections. In North Africa, Cylindracanthus occurs in the Ypresian beds of the Phosphate basins of Morocco and Algeria (Arambourg 1952; Khalloufi et al. 2017), and in the Priabonian beds of Ad-Dakhla (Adnet et al. 2010). : Published as part of Zouhri, Samir, Gingerich, Philip D., Khalloufi, Bouziane, Bourdon, Estelle, Adnet, Sylvain, Jouve, Stéphane, Elboudali, Najia, Amane, Ayoub, Rage, Jean-Claude & Tabuce, Rodolphe, 2021, Middle Eocene vertebrate fauna from the Aridal Formation, Sabkha of Gueran, southwestern Morocco, pp. 121-150 in Geodiversitas 43 (5) on page 131, DOI: 10.5252/geodiversitas2021v43a5, http://zenodo.org/record/4605963 : {"references": ["SCHULTZ O. 1987. - Taxonomische Neugruppierung der Uberfamilie Xiphioidea (Pisces, Osteichthyes). Annalen des Naturhistorischen Museums in Wien. Serie A fur Mineralogie und Petrographie, Geolo - gie und Palaontologie, Anthropologie und Prahistorie 89: 95 - 202.", "GALLO V., FIGUEIREDO F. J. DE & CARVALHO M. S. S. 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