Fishes of the Western North Atlantic 451 



Rio de la Plata by rcf. to Eigenmann, 1909); Lopez, An. Mus. Argent. Cicnt. Nat., 42, 1947: 102, pi. 8 

 (kidney, Argentina). 

 Leiobatus aqutla Lahille, Physis B. Aires, 5, 1921: 63 (listed, Argentina); Marini, Physis B. Aires, 9, 1929: 

 452 (listed, Puerto Quequen, Argentina). 



Genus Aetobatus Blainville 18 16 



Duck-billed Rays 



Aetobatus Blainville, Bull. Soc. philom. Paris, 1816: 112; also J. Physique, 5j, 1816: 262; type species, Raja 

 narinari Euphrasen (Handl. K. Vetensk. Akad., II, 1790: 217, pi. 10), St. Bartholomew I., West Indies, 

 designated by Gill (Proc. U. S. nat. Mus., ly, 1894: 112).'''' 



Generic Synonyms: 



Raja (in part) Euphrasen, Handl. K. Vetensk. Akad., 11, 1790: 217; Bloch and Schneider, Syst. IchthyoL, 



1 801: 361, and subsequent authors; for R. narinari Euphrasen and synonyms of it, and for R.Jiagellum 



Bloch and Schneider. 

 Myliobatis (in part) Cuvier, Regne Anim., 2, 1817: 138, footnote i, and subsequent authors; for Raja narinari 



Euphrasen 1790 and its synonyms; not Myliobatis G. St.-Hilaire 1817, 1827; see discussion, p. 434, 



footnote 4. 

 Aetobatis Miiller and Henle, Arch. Naturg., (Jahrg. 3) J, 1837: 401; also, Charlesworth Mag. nat. Hist., 2, 



1837: 91 (descr., but no species named); Plagiost., 1841: 179; type species. Raja narinari Euphrasen 



179O; 



Aetobates Richardson, Rep. Ichthyol. China, Japan, 1846: 198; for Raja jlage Hum Bloch and Schneider (Syst. 

 IchthyoL, 1801: 361, pi. 73); \ emended spelling for Aetobatis Miiller and Henle 1837, 1841. 



Stoasodon Cantor, J. Asiat. Soc. Beng., 1849: 1416; type and only included species, Raja narinari Euphrasen 

 1790. 



Aetobatus Dumeril, Mem. Acad. Sci. France, 27 (i), 1856: 145; .■' emended spelling for Aetobatis Miiller and 

 Henle 1837, 1841. 



Goniobatis Agassiz, L., Proc. Boston Soc. nat. Hist., 6, 1859: 385; type species, RajaJiageUum Bloch and Schnei- 

 der 1801, designated by Jordan (Genera Fish., 2, 1919: 277); G. meleagris L. Agassiz, Sandwich [Ha- 

 waiian]) Is. also included. 



Pteromy/aeus Walford, Mar. Game Fish. Pacif Coast, 1937: pi. 26, fig. C, for "Mexican Eagle, Pteromylaeus 

 sp.," equals Aetobatus narinari (Euphrasen) 1790. 



Not Raja Linnaeus, Syst. Nat., j, 1758: 231. 



Not Aetobatis Blainville, in Vieillot, Faune Frang., 1825: 38; type and only included species. Raja aquila Lin- 

 naeus 1758, equals Myliobatis Cuvier 1817; see discussion, p. 434, footnote 4. 



Not Pteromylaeus Garman, Mem. Harv. Mus. comp. Zool., j6, 191 3: 437; type species, Myliobatis asperrimus 

 Jordan and Evermann (Bull. U. S. nat. Mus., 47 [3], i8g8: 2754), designated by Jordan (Genera Fish., 

 4, 1920: 548). 



Generic Characters. Disc lozenge-shaped, much broader than long. Tail much 

 longer than disc, either with or without a serrate-edged spear-pointed spine (or spines) 

 with forked root. Pectorals entirely interrupted along sides of head, their subrostral 

 portion forming a separate lobe or fin projecting prominently forward from below 

 anterior part of head at a considerably lower level than pectorals proper (p. 466); rays 

 supporting main portions of pectorals much stouter than those of subrostral fin. Dorsal 

 fin above posterior parts of pelvics. Free posterior margin of transverse curtain on roof 

 of mouth nearly straight, coarsely fringed; free anterior margin of fold overlapping 

 youngest rows of upper teeth smooth, but rearward there are two irregular transverse 



54. See discussion, p. 434, footnote 4. 



29* 



