A taxonomic revision of the Andean killifish genus Orestias (Cyprinodontiformes, Cyprinodontidae). Bulletin of the AMNH ; v. 178, article 2

Simple item page
dc.contributor.authorParenti, Lynne R.en_US
dc.date.accessioned2005-10-06T14:21:49Z
dc.date.available2005-10-06T14:21:49Z
dc.date.issued1984en_US
dc.descriptionp. 110-214 : ill., maps ; 26 cm.en_US
dc.descriptionIncludes bibliographical references (p. 211-214).en_US
dc.description.abstract"The ichthyofauna of the high Andes is assumed to be of low taxonomic diversity. Only three fish genera, the killifish Orestias and the catfishes Astroblepus and Trichomycterus include species endemic to the Altiplano, the high-attitude plateau between the eastern and western slopes of the central Andes. The atherinid Basilichthys is known doubtfully from the Altiplano. In the last revision of the genus Orestias, Tchernavin (1944a) recognized 20 species and five subspecies. This small number was taken as evidence of the low diversity of fish of the Titicaca Basin. However, in the past two years, five new Orestias species have been described, three from Lago Titicaca (Lauzanne, 1981) and two from the Altiplano of northern Chile (Arratia, 1982). With the benefit of large recent collections, 43 species of Orestias are recognized in the present revision, 14 being described as new (O. gracilis, O. rotundipinnis, O. farfani, O. gymnotus, O. hardini, O. ctenolepis, O. ascotanensis, O. richersoni, O. multiporis, O. mundus, O. ututo, O. imarpe, O. tomcooni, and O. robustus). Seven synapomorphies described here define Orestias as a monophyletic group: (1) pelvic fins and fin girdle are absent; (2) vomer is absent; (3) middle anal and middle dorsal fin radials are cartilaginous, rather than ossified; (4) bony anterior and posterior ceratohyal are separated ventrally by a large gap filled with cartilage; (5) first postcleithrum is absent; (6) anguloarticular lacks a ventral extension parallel to the retroarticular; and (7) there is a unique squamation and head pore pattern characterized by a prominent lyre-shaped arrangement of minute neuromasts and a prominent median dorsal ridge of scales running from the top of the head to the dorsal fin origin. Primary characters used to distinguish Orestias species are overall body shape and squamation pattern. Diversity of form is marked. There are large, troutlike midwater predators, such as O. cuvieri, diminutive inshore species such as O. minutus and O. minimus, and very wide-headed and wide-bodied species, with large, thick granulated scales, such as O. luteus and O. albus. The diversity among Orestias species in Lago Titicaca, the large, high-altitude lake of the Altiplano of Peru and Bolivia, has led to the application of the term 'species flock' to this group of lacustrine killifish. However, the Orestias of Titicaca do not form a monophyletic group, and it is recommended that the term 'species flock' not be used for the killifishes limited to the lake. The known range of Orestias extends from northern Peru to northern Chile. It is expected that the number will rise with additional collecting, because collections are lacking from many of the small, isolated lakes of the Altiplano; also, single specimens of apparently new species are known, yet remain undescribed. The hypothesis of a close relationship between Orestias and the Anatolian cyprinodonts is reviewed"--P. 110.en_US
dc.format.extent29057838 bytes
dc.format.mimetypeapplication/pdf
dc.identifier.urihttp://hdl.handle.net/2246/575
dc.languageengen_US
dc.language.isoen_US
dc.publisher[New York] : American Museum of Natural Historyen_US
dc.relation.ispartofseriesBulletin of the American Museum of Natural History ; v. 178, article 2en_US
dc.subject.lccQH1 .A4 vol.178, art.2, 1984en_US
dc.subject.lcshOrestiasen_US
dc.subject.lcshKillifishes -- Altiplanoen_US
dc.subject.lcshKillifishes -- Andes Regionen_US
dc.subject.lcshKillifishes -- South Americaen_US
dc.subject.lcshFishes -- Altiplanoen_US
dc.subject.lcshFishes -- Andes Regionen_US
dc.subject.lcshFishes -- South Americaen_US
dc.titleA taxonomic revision of the Andean killifish genus Orestias (Cyprinodontiformes, Cyprinodontidae). Bulletin of the AMNH ; v. 178, article 2en_US
dc.title.alternativeAndean killifish Orestiasen_US
dc.typetexten_US

Files

Original bundle
Now showing 1 - 1 of 1
Thumbnail Image
Name:
/v2/dspace/ingest/pdfSource/bul/B178a02.pdf
Size:
27.71 MB
Format:
Adobe Portable Document Format
Description:
Download

Collections

Bulletin of the American Museum of Natural History