Abstract
A new species of giant guitarfish, Glaucostegus younholeei sp. nov., is described from 13 specimens, 730–933 mm total length, collected from fish landing center of Bangladesh Fisheries Development Corporation in Cox’s Bazar district of Bangladesh. The new species is distinguished from congeners in having the following combination of characters: Body brownish or greyish in color with a narrowly wedge-shaped disc, and long narrow bluntly pointed snout (angle 31–40°), and broad oblique nostrils with the narrow anterior opening. Nostrils about half of the mouth width, subequal (0.98–1.33) to internasal width; ~55–57 nasal lamellae; anterior nasal flaps slightly penetrating into internasal space, their interspace 2.20– 2.61 in length of the posterior nasal aperture. Orbit very small in adults, diameter 8.19–11.62 in preorbital length, 2.25–2.69 in interorbital space. Rostral ridges almost joined along their entire length; margin of cranium sharply demarcated before eyes. Spiracular folds very short and widely separated. Skin rough, densely covered with small denticles, more coarsely granular on the dorsal surface than ventrally, enlarged between orbits and in a distinct band between nape and first dorsal fin. Tail relatively longer, length 1.15–1.48 in disc length; dorsal fins narrowly spaced, interspace 1.32–2.11 in base length of the first dorsal fin. Clasper length in adult male 4.37–5.70 in total length. Phylogenetic analysis of DNA barcode sequences also shows the clear divergence of Glaucostegus younholeei from other congeneric species obtained from GenBank. A key is provided to the 8 known members including new species of the genus Glaucostegus.
References
Ahmed, M.S., Zhilik, A.A., Akter, S., Chowdhury, N.Z. & Reza, H.A. (2018) DNA Barcoding of Sharks, Skates, Rays and Flatfishes of Bangladesh. https://www.ncbi.nlm.nih.gov/nuccore/?term=Glaucostegus++granulatus (accessed 10 January 2021.
Anonymous [Bennett], E.T. (1830) Class Pisces. In: Memoir of the life and public services of Sir Thomas Stamford Raffles.... By his Widow [Lady Stamford Raffles]. John Murray, London, pp. 686–694.
Anonymous, (1798) [Review of] Tome I of ‘Histoire naturelle des poissons’ by Lacepède (1798). Allgemeine Literatur–Zeitung, 3 (No. 287), 673–678.
Bass, A.J., D’Aubrey, J.D. & Kistnasamy, N. (1973) Sharks of the east coast of southern Africa. III. The genus Carcharhinus (Carcharhinidae). Oceanographic Research Institute (Durban) Investigational Report No. 33.
Bass, A.J., D’Aubrey, J.D. & Kistnasamy, N. (1975) Sharks of the east coast of southern Africa. III. The families Carcharhinidae (excluding Mustelus and Carcharhinus) and Sphyrnidae. Oceanographic Research Institute (Durban), Investigational Report No. 37, 1–100.
Bonaparte, C.L. (1846) Catalogo metodico dei pesci europei. Atti della Società Italiana di Scienze Naturali e del Museo Civico di Storia Naturale di Milano, 1846,1–95.
Chabanaud, P. (1929) Description d’un nouvel élasmobranche batoïde de Madagascar. Bulletin du Muséum National d’Histoire Naturelle, (Série 2), 1 (6), 365–369.
Collenot G. (1969) Longueur des ptérygopodes. Etude biométrique de la croissance relative des ptérygopodes chez la roussette, Scyliorhinus canicula. cahiers de Biologie Maine, 10, 309–329.
Compagno, L. J. V. (2005). Checklist of living Chondrichthyes. Reproductive Biology and Phylogeny of Chondrichthyes – Sharks, Batoids and Chimaeras (Hamlett, W. C.), Science Publishers, Enfield, New Hampshire, USA, pp. 503–548.
Compagno, L.J.V. (1984) FAO species catalogue. Vol. 4. Sharks of the world. An annotated and illustrated catalogue of shark species known to date. FAO Fish Synopsis 125 (4), 1–655.
Compagno, L.J.V. (1999). Checklist of living elasmobranchs. Sharks, Skates, and Rays – The Biology of Elasmobranch Fishes (Hamlett, W. C.). The Johns Hopkins University Press, Baltimore, Maryland, pp. 471–498.
Cuvier, G.L.C.F.D. (1829) Le règne animal, distribué d’après son organisation, pour servir de base à l’histoire naturelle des animaux et d’introduction à l’anatomie comparée. Edition 2. Paris, Déterville, de l’Impr. de A. Belin, 584 pp.
Dulvy, N.K., Fowler, S.L., Musick, J.A., Cavanagh, R.D. & others (2014) Extinction risk and conservation of the world’s sharks and rays. eLife 3:e00590. https://doi.org/10.7554/eLife.00590.001
Ebert, D.A., Ho, H.C., White, W.T. & De Carvalho, M.R., (2013) Introduction to the systematics and biodiversity of sharks, rays, and chimaeras (Chondrichthyes) of Taiwan. Zootaxa, 3752 (1), pp. 5–19.
Felsenstein, J. (1985) Confidence limits on phylogenies: an approach using the bootstrap. Evolution, 39 (4), 783–791.
ForskåL, P. (1775) Descriptiones animalium, avium, amphibiorum, piscium, insectorum, vermium / quae in itinere orientali observavit Petrus Forskål. Post mortem auctoris edidit Carsten Niebuhr. Adjuncta est materia medica kahirina atque tabula maris Rubri geographica. Post mortem auctoris edidit Carsten Niebuhr. Hauniae. Descriptiones animalium quae in itinere ad Maris Australis terras per annos 1772 1773 et 1774 suscepto, ...: 1–20 + i–xxxiv + 1–164, map. [Pisces on pp. x–xix and 22–76].
Fowler, H.W. (1941) Contributions to the biology of the Philippine archipelago and adjacent regions. The fishes of the groups Elasmobranchii, Holocephali, Isospondyli, and Ostarophysi obtained by the U.S. Bureau of Fisheries streamer “Albatross” in 1907 to 1910, chiefly in the Philippine Islands and adjacent seas. Bulletin United States National Museum, 100, 1–879.
Fricke, R., Eschmeyer, W.N. & Van der Laan, R. (Eds.) (2021) Eschmeyer’s Catalog of Fishes: Genera, Species, References. Available from: http://researcharchive.calacademy.org/research/ichthyology/catalog/fishcatmain.asp (accessed on 5 January 2021).
Fricke, R., Mahafina, J., Behivoke, F., Jaonalison, H., Léopold, M. and Ponton, D. (2018) Annotated checklist of the fishes of Madagascar, southwestern Indian Ocean, with 158 new records. FishTaxa, 3(1): 1–432.
Geoffroy St. Hilaire, E. (1817) Poissons du Nil, de la Mer Rouge et de la Méditerranée, In: Description de l’Egypte ou recueil des observations et des recherches qui ont été faites en Égypte pendant l’expedition de l’Armée français, publié par les ordres de sa Majesté–L’Empereur Napoléon le Grand., pl. 18–27.
Johri, S., Fellows, S.R., Solanki, J., Busch, A., Livingston I., Mora, M.F., Tiwari, A., Cantu, V.A., Goodman, A., Morris, M.M., Doane, M.P., Edwards, R.A. & Dinsdale, E.A. (2020). Mitochondrial genome to aid species delimitation and effective conservation of the Sharpnose Guitarfish (Glaucostegus granulatus). Meta Gene, 24, 100648.
Kalyaanamoorthy, S., Minh, B.Q., Wong, T.K., von Haeseler, A. & Jermiin, L.S. (2017) ModelFinder: fast model selection for accurate phylogenetic estimates. Nature Methods, 14 (6), 587–589. https://doi.org/10.1038/nmeth.4285
Kimura, M. (1980) A simple method for estimating evolutionary rates of base substitutions through comparative studies of nucleotide sequences. Journal of Molecular Evolution, 16 (2), 111–120. https://doi.org/10.1007/BF01731581.
Kumar, S., Stecher, G. & Tamura, K. (2016) MEGA7: molecular evolutionary genetics analysis version 7.0 for bigger datasets. Molecular Biology and Evolution, 33 (7), 1870–1874. https://doi.org/10.1093/molbev/msw054.
Kyne, P.M., Jabado, R.W., Rigby, C.L., Dharmadi, Gore, M.A., Pollock, C.M., Herman, K.B., Cheok, J., Ebert, D.A., Simpfendorfer, C.A. & Dulvy, N.K. (2020) The thin edge of the wedge: extremely high extinction risk in wedgefishes and giant guitarfishes. Aquatic Conservation: marine and freshwater ecosystems, 30 (7), 1337–1361. https://doi.org/10.1002/aqc.3331
Last, P.R., Compagno, L.J.V. & Nakaya, K. (2004) Rhinobatos nudidorsalis, a new species of shovelnose ray (Batoidea: Rhinobatidae) from the Mascarene Ridge, central Indian Ocean. Ichthyological Research, 51 (2), 153–158. http://dx.doi.org/10.1007/s10228-004-0211-0
Last, P.R., White, W.T., Carvalho, M.R. de, Séret, B., Stehmann, M.F.W. & Naylor, G.J.P. (Eds.) (2016a) Rays of the World. CSIRO Publishing, Melbourne, pp. 110–116.
Last, P.R., Seret, B. & Naylor, G.J. (2016b) A new species of guitarfish, Rhinobatos borneensis sp. nov. with a redefinition of the family-level classification in the order Rhinopristiformes (Chondrichthyes: Batoidea). Zootaxa, 4117 (4), pp. 451–475.
Müller, J. & Henle, F.G.J. (1841) Systematische Beschreibung der Plagiostomen. Berlin, Veit, pp. 1–200.
Nguyen, L.-T., Schmidt, H.A., von Haeseler, A. & Minh, B.Q. (2015) IQ-TREE: a fast and effective stochastic algorithm for estimating maximum-likelihood phylogenies. Molecular Biology and Evolution, 32 (1), 268–274. https://doi.org/10.1093/molbev/msu300.
Palacios-Salgado, D.S., Burnes-Romo, L.A., Tavera, J.J. & Ramirez-Valdez, A., (2012) Endemic fishes of the Cortez biogeographic province (Eastern Pacific Ocean). Acta Ichthyologica et Piscatoria, 42 (3), 153–164. https://doi.org/10.3750/AIP2011.42.3.01
Pollerspöck, J. & Straube, N. (2021) www.shark-references.com, World Wide Web electronic publication, Version 2021)
Rambaut, A. & Drummond, A. (2016) Figtree Version 1.4.3. Available from: http://tree.bio.ed.ac.uk/software/figtree/ (accessed on 01 January 2021).
Stevens, J.D., & Lyle, J.M. (1989) Biology of three hammerhead sharks (Eusphyra blochii, Sphyrna mokarran and S. lewini) from northern Australia. Marine and Freshwater Research, 40 (2), 129–146.
Teng, H.-T. (1959) Studies on the elasmobranch fishes from Formosa. Part 7. A review of the rhinobatoid rays of Formosa, with description of a new species of Rhinobatos. Reports of the Laboratory of Fishery Biology, Taiwan Fisheries Research Institute, 10, 1–15.
Trifinopoulos, J., Nguyen, L.-T., von Haeseler. A. & Minh, B.Q. (2016) W-IQ-TREE: a fast online phylogenetic tool for maximum likelihood analysis. Nucleic Acids Research, 44 (W1), W232–W235. https://doi.org/10.1093/nar/gkw256.
UNEP-WCMC (Comps.) (2014) Checklist of CITES species. CITES Secretariat, Geneva, Switzerland, and UNEP-WCMC, Cambridge, United Kingdom..
Ward, R.D., Zemlak, T.S., Innes, B.H., Last, P.R. & Hebert, P.D.N. (2005) DNA barcoding Australia’s fish species. Philosophical Transactions of the Royal Society B: Biological Sciences, 360 (1462), 1847–1857. https://doi.org/10.1098/rstb.2005.1716