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Megascops sanctaecatarinae

Corujinha-do-sul (Megascops sanctaecatarinae)

Megascops sanctaecatarinae

Cladus: Eukaryota
Supergroup: Opisthokonta
Regnum: Animalia
Subregnum: Eumetazoa
Cladus: Bilateria
Cladus: Nephrozoa
Cladus: Deuterostomia
Phylum: Chordata
Subphylum: Vertebrata
Infraphylum: Gnathostomata
Superclassis: Tetrapoda
Classis: Aves
Subclassis: Carinatae
Infraclassis: Neornithes
Parvclassis: Neognathae
Ordo: Strigiformes
Familia: Strigidae
Subfamilia: Striginae
Genus: Megascops
Species: Megascops sanctaecatarinae

Name

Megascops sanctaecatarinae (Salvin, 1897)

Reference

Bulletin of the British Ornithologists' Club 6 p.37

Vernacular names
Internationalization
English: Long-tufted Screech-owl
‪Norsk (bokmål)‬: Duskugle
Português: Corujinha-do-sul

The Long-tufted Screech-owl (Megascops sanctaecatarinae) is a species of owl in the Strigidae family. It is found in Argentina and Brazil. Recent revision of its distribution has also incorporated Uruguay (consequently excluded from the distribution of M. atricapilla).

Scientific name and conflicting name

The Long-tufted Screech Owl was described as Scops sanctae-catarinae by Osbert Salvin in 1897. Robert Ridgway (Proceedings of the United States National Museum, Volume I (1879)) had previously described a type of S. brasilianus from the "St. Catherine's" range of southern Brazil. Salvin, however, in describing sancta-catarinae, made no reference to Ridgway's early description.

The first author to recognize its validity was Richard Bowdler Sharpe (Hand-list of the Genera, vol. I (1899)), and, initially, this form was considered distinct from brasilianus (=choliba) as well as atricapilla, and the name was also employed in Dubois (Synopsis Avium, (1901)), who listed it as a "variation" of brasilianus. Later authors, including Cory (Catalogue of the Birds of the Americas, (1918)) and Peters (Check-list of the Birds.., vol. 4, (1940)) placed it as a synonym of atricapillus. The opinion had also prevailed, by this time, that Otus should replace Scops as the genus name (though it is also currently recognized in Megascops).

This treatment was largely retained for several decades, with some exceptions, including Kelso (Biological Leaflet No. 4 (1934), and Olrog (Las Aves Argentinas... 1959)). Gerrit Hekstra (Bulletin Zoologisch Museum, vol. 9/7, (1982)) revived recognition of sanctaecatarinae (14.9), listing it separately from atricapillus, (14.7), but as a subspecies, O. a. sanctaecatarinae and listing the name Otus choliba maximus Sztolcman, 1926 as a synonym. Hekstra's numerated list corresponded to the descriptions of type specimens he had published the same year in his thesis, "A Revision of the American Screech Owls" (Vrije University, Amsterdam). In this thesis, and not in his published paper, Hekstra explicitly suppressed the scientific names he cited—that use of them was not to be construed as relevant to nomenclatural rules. The distribution of sanctaecatarinae included the states and provinces of São Paulo, Rio Grande do Sul, Santa Catarina (Brazil), and Misiones (Argentina). Further revision determined that sanctaecatarinae represented a distinct species of its own, and its distribution, including and in relation to that of atricapilla, was also revised, incorporating Uruguay, (which was consequently excluded from the distribution of atricapilla). This revision has recently prevailed, and almost all references to the family from the past 25 years, including references to these two species (including Howard and Moore, Complete Checklist of the Birds of the World (1991), Holt et al., Handbook of the Birds of the World, vol. 5 (1999) and Duncan, Owls of the World (2006)), reflect it.

The revision of the Long-tufted Screech-Owl's distribution has brought attention to references relating to a name which had been published 43 years prior to sanctaecatarinae. Martin Heinrich Karl Lichtenstein (Nomenclator Avium, 1854) published a list of type specimens in the Berlin Museum, to which some new names were introduced, but Nomenclator was simply a list, and all the names therein lacked descriptions. One of these nomen nudum was based upon a screech-owl taken by the collector Sello near the vicinity of Montevideo, Uruguay--Ephialtes argentina. Hermann Schlegel later published a description of this same type (Museum des Pays-Bas, Oti (1862)), but the description was done in a manner that did not allow for clarity as to whether or not he felt that argentina was a valid species (one recognized for a legitimate taxon). The description was provided as a footnote, not as a synonym, for his entry for Scops brasiliensis. Schlegel did not see how this specimen differed from brasiliensis, and also suggested that it might be compared to Ephialtes Watsonii (another name which was not validly adopted in his review): "...[n]e se distinguishe Sc. brasiliensis que par une taille un peu plus forte et par ses teintes en general un peu plus claires. Cet oiseau a ete observe daus les environs de Montevideo d'ou M. Sello en a fait parvenir deux individus femelles au Musee de Berlin. Quatrieme remige egalanta a peu pres la cinquieme. Distribution des teintes en tout point semblable a celle du brasiliensis. Il s'agit de savoir si cet oiseau est identique avec l'Ephialtes Watsonii de Cassin. Aile 7 pouces 3 lignes. Pointe d'aile 18 lignes. Queue 3 pouces 9 lignes. Tarse 16 lignes. Doigt du milieu 11 lignes. Aigrettes 15 lignes. Doigts nus." That Schlegel did not place argentina in Scops, merely invoking its original genus name, offers the most compelling argument in determining that he did not validly introduce it.

George Robert Gray (Hand-list of Genera and Species of Birds, vol. I (1869) was the first author to validly use Lichtenstein's name, combining it as entry 493 in the genus Scops of his own list (S. (Megascops) argentinus). However, Gray did not include a description, but cited a vague reference to "Watsonii, p.?, Schlegel." Johann Palacky (Der Verbreitung der Vogel auf der Erde, (1885, p. 10) also validly used argentinus, following Gray's treatment. With exception to these two works, most authors of the 19th and early 20th centuries took heed to Schlegel's assessment (Giebel, Thesaurus Ornithologiae, vols. ii (1875), iii (1877); Sharpe, Catalogue of the Birds in the British Museum, vol. II (1875); Ridgway (Ibid); Taczanowski (Ornithologie du Perou, t.I, (1884); and Dubois (Ibid), placing the name as a synonym of brasilianus (variably spelled), or of choliba.

Hekstra was the first author after Dubois to make reference to argentina, where he reintroduced it as a valid subspecies Otus atricapillus argentinus. Not consulting Nomenclator, he assumed that the description had been published therein and wrongly cited Lichtenstein as the authority of the name. In his corresponding thesis, Hekstra described argentinus (14.8), the first such description of the type since Schlegel. He also placed the form Otus choliba pintoi Kelso, 1936 as a synonym of it. This treatment was referenced in Claus Koenig and Roberto Juan Straneck's description of Otus hoyi (Stuttgarter Beiträge zur Naturkunde., Serie A, Biologie, 428 (1989)) and in Howard and Moore (Ibid), where both names were validly used. Holt et al. (Ibid), Dickinson (Howard and Moore Complete Checklist.. (2003), and Weick (Owls (Strigiformes): Annotated and Illustrated Checklist (2006), placed argentinus in the synonymy of atricapilla (variably spelled), the latter author further invoking "Lichtenstein, 1854" as the authority, and also providing wing chord measurements of the type, from Hekstra's description.

The name argentina, if it represents the same taxon as sanctaecatarinae, would take priority over that name, but no author has formally published a revised synonymy. Article 11.5 of the International Code of Zoological Nomenclature (fourth ed., 1999) requires that a "name must be used as valid for a taxon when proposed,.." This provision would not allow for recognition of Schlegel as the authority of the name; however, an exclusionary clause 11.5.1 states that a "name proposed conditionally for a taxon before 1961 is not to be excluded on that account alone." While this wording, particularly "on that account alone," seems ambiguous and allows for further argument, Schlegel did describe argentina in a way that conforms to the Code's definition of "conditional" ("the proposal of a name or a type fixation: one made with stated reservations"), and further, two authors had validly used the name before Salvin described sanctae-catarinae, and its placement in synonymy by numerous others suggests that it had been treated as a valid name.

The possibility that argentina was not made valid in Schlegel also allows for consideration of the argument that the name became available in Hekstra's published report (Ibid). While Hekstra had made it explicit in his complimentary thesis that names he employed in it were not to be considered with regards to "nomenclatural purposes," a provision of the Code (Ibid) would, if Schlegel is not recognized as the authority, transfer authority to him. Article 13.1.2 of the Code, with its "Requirements" for names published after 1930, mandates that such names "be accompanied by a bibliographic reference to such a published statement, even if the statement is contained in a work published before 1758, or in one that is not consistently binominal, or in one that has been suppressed by the Commission." Under this provision, Hekstra, numerating reference in his formal published report to the description in his thesis, would be construed as the authority. In this case, argentina would be available, but only as a synonym of sanctaecatarinae, including maximus Sztolcman and pintoi Kelso

References

BirdLife International 2004. Megascops sanctaecatarinae.

2006 IUCN Red List of Threatened Species. Downloaded on 24 July 2007.

[1] Part of the description from Salvin (pp. 37–38). Bulletin of the British Ornithologists' Club.

[2] Second part (of two), p. 38, Salvin. Bulletin of the British Ornithologists' Club.

[3] Ridgway, Proceedings of the United States National Museum, Vol. I, 1879. See pp. 94–95

Cory, Catalogue of the Birds of the Americas. 1918. See p. 26 [4]

Sharpe, Hand-list of the Genera and Species.., Vol. I, 1899. [5]

Dubois, Synopsis Avium. 1901. [6]

Lichtenstein, Martin Heinrich Karl. Nomenclator Avium. 1854, p. 7 [7]

Hekstra, Zoologisch Museum, Amsterdam, vol. 9/7, (1982) [8].

Gray, George Robert. Hand-list of genera and species of birds. Vol. I, 1869. [9]

Palacky, Johann. Der Verbreitung der Vogel auf der Erde. 1885. [10]

Giebel, Thesaurus Ornithologiae, Vol. III (1877) [11]

Giebel, Thesaurus Ornithologiae, Vol. II (1875) [12]

Sharpe, Richard Bowdler. Catalogue of the Birds in the British Museum. Vol. II (1875). [13]

Taczanowski, Ladislaus. Ornithologie du Perou. Vol. I (1884). [14]

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