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Platyrhinoidis triseriata

Platyrhinoidis triseriata (Ian Sayers, NOAA/SiMON)

Cladus: Eukaryota
Supergroup: Opisthokonta
Regnum: Animalia
Subregnum: Eumetazoa
Cladus: Bilateria
Cladus: Nephrozoa
Cladus: Deuterostomia
Phylum: Chordata
Subphylum: Vertebrata
Infraphylum: Gnathostomata
Classis: Chondrichthyes
Subclassis: Elasmobranchii
Superordo: Rajomorphii
Ordo: Rajiformes
Superfamilia: Rhinobatoidea
Familia: Rhinobatidae
Genus: Platyrhinoidis
Species: Platyrhinoidis triseriata


Platyrhinoidis triseriata (Jordan & Gilbert, 1880)

Vernacular names
English: Thornback guitarfish


The thornback guitarfish, Platyrhinoidis triseriata, is a species of ray in the subfamily Platyrhininae of the family Rhinobatidae (some authors elevate the platyrhinids to full family status). It is the only member of the genus Platyrhinoidis. It is found in Mexico and the United States. Its natural habitats are shallow seas, subtidal aquatic beds, estuarine waters, and intertidal marshes. Other common names include the banjo shark (not to be confused with the Australian banjo sharks, Trygonorrhina), California thornback, guitarfish, round skate, shovelnose, thornback ray, or thornback.

Phylogenetic studies show that Platyrhinoidis occupies a basal position within the Rhinobatidae relative to more derived genera, such as Rhinobatos and Trygonorrhina. It also does not form a monophyletic group with Platyrhina and Zanobatus, with which it is grouped in the Platyrhininae.[2]


1. ^ Carlisle, A.B. and Garayzar, C.V. (2005). Platyrhinoidis triseriata. In: IUCN 2005. IUCN Red List of Threatened Species. Downloaded on 13 August 2008.
2. ^ Haaramo, M. (2003). Rhinobatidae - guitarfishes. Mike's Phylogeny Archive. Retrieved on November 19, 2008.

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