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Strigogyps is an extinct genus of Fossil birds bird from the Middle Eocene to Early Oligocene of France and Germany. It was probably around the size of a large chicken or a guan, weighing not quite . Apparently, as indicated by the ratio of lengths of wing to leg bones, S. sapea was flightless. Its legs were not adapted to running, so it seems to have had a walking lifestyle similar to Psophiidae. Unlike other Cariamiformes which appear to have been mostly carnivorous, the specimens of one species, Strigogyps sapea, suggest a facultatively herbivorous or omnivorous diet.
The type species of Strigogyps is S. dubius, which was described by Gaillard in 1908.Gaillard, C. (1908). Les oiseaux des Phosphorites du Quercy. - Annales del'Université de Lyon (Nouvelle Série) 23: 1-178. It was initially placed in the owl order Strigiformes and considered to be a Sophiornithidae. S. dubius is based on a single tibiotarsus from the Late Eocene to Early Oligocene Quercy of France. This tibiotarsus was destroyed in World War II during the bombing of Munich, but casts remain. In 1939, Gaillard described a second species of Strigogyps, S. minor, based on a humerus, two , and two carpometacarpi, also from Quercy. In 1981, Mourer-Chauviré redescribed S. minor as Ameghinornis minor, the only member of the new Phorusrhacidae subfamily, Ameghinornithinae.Mourer-Chauviré, C. 1981. Première indication de la présence de Phorusrhacidés, famille d'oiseaux géants d'Amérique du Sud, dans le Tertaire européen: Ameghinornis nov. gen. (Aves, Ralliformes) des Phosphorites du Quercy, France. Géobios 14, 637-647. Ameghinornis was later placed in its own family, Ameghinornithidae. In 1987, Peters named another Monotypic taxon genus of ameghinornithid, Aenigmavis sapea, based on a nearly complete skeleton from the Middle Eocene Messel pit of Germany.Peters, Dieter Stefan (1987): Ein "Phorusrhacidae" aus dem Mittel-Eozän von Messel (Aves: Gruiformes: Cariamae). Documents des Laboratoires de Géologie de Lyon 99: 71-87. Article Mayr (2005) found Aenigmavis to be a species of Strigogyps, S. sapea, and found Ameghinornis to be synonymous with S. dubius, as they both came from Quercy, and are almost identical except for coracoids and carpometacarpi of Ameghinornis, which Mayr found to be unlike other ameghinornithids, and probably from an Idiornithidae. In 1935, Lambrecht described a new New World vulture, Eocathartes robustus, and a hornbill, Geiseloceros robustus, from the Middle Eocene (Lutetian) of the Geisel Valley of Germany. Each was based on a single specimen, and they were found very close together.Lambrecht, K . (1935). Drei neue Vogelformen aus dem Lutétian des Geiseltales. - Nova Acta Leopoldina, Neue Folge 3: 361 - 367. Mayr (2007) found them to be synonymous and a species of Strigogyps, S. robustus.Mayr, Gerald (2007). Synonymy and actual affinities of the putative Middle Eocene "New World vulture" Eocathartes Lambrecht, 1935 and "hornbill" Geiseloceros Lambrecht, 1935 (Aves, Ameghinornithidae). Paläontologische Zeitschrift 81, 457-462.[1]
Recent studies (Alvarenga and Höfling 2003, Mayr 2005) have found Strigogyps to be a more basal member of Cariamae, and not particularly close to the phorusrhachids.Mayr, Gerald (2005): "Old World phorusrhacids" (Aves, Phorusrhacidae): a new look at Strigogyps (" Aenigmavis") sapea (Peters 1987). PaleoBios (Berkeley) 25(1): 11-16 HTML abstractAlvarenga, Herculano M. F. & Höfling, Elizabeth (2003): Systematic revision of the Phorusrhacidae (Aves: Ralliformes). Papéis Avulsos de Zoologia 43(4): 55-91 PDF fulltext Salmila, another bird from Messel was found to be more basal than Strigogyps, and the clade composed of Salmila and Cariamae to be the sister taxon to Psophiidae within a monophyletic Gruiformes.Mayr, G. 2002. A new specimen of Salmila robusta (Aves: Gruiformes: Salmilidae n. fam.) from the Middle Eocene of Messel. Paleontologische Zeitschrift 76(2/2): 305-316.
Fragmentary remains from the Palaeocene and/or Eocene of England and North America have also been suggested to be phorusrhachids, but, like Strigogyps, they probably are not.
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