Sunday, May 31, 2020

[Ichthyology • 2019] Pseudobatos buthi • A New Guitarfish of the Genus Pseudobatos (Batoidea: Rhinobatidae) with Key to the Guitarfishes of the Gulf of California


Pseudobatos buthi K.M. Rutledge, 2019


A new guitarfish of the genus Pseudobatos is described based on 82 specimens obtained from the Gulf of California. Sixty-three morphometric measurements were taken on all specimens, and on ten specimens from each of three congeners. A principal component analysis and linear discriminant analysis were performed on these morphometric data for discrimination. The new species (∼685 mm TL) is most similar to Pseudobatos productus but differs in having a narrower maximum disc width (30–35% vs. 36–38% TL), shorter distance from nostril to disc margin (2.8–4.0% vs. 4.2–5.2% TL), narrower disc width at anterior orbit (12–19% vs. 20–22% TL), and a narrower tip of snout width (3% vs. 4–6% TL). The species is also less densely scaled between the orbits and has less pronounced rostral thorns than Pseudobatos productus. A key to the guitarfishes of the Gulf of California is also provided.

 Holotype of Pseudobatos buthi, new species (SIO 15-405 [formerly UCLA W50-189], 471.1 TL male) 

Fig. 2. All four species of guitarfishes from the Gulf of California, shown from end of disc to snout.
(A) Pseudobatos buthi, new species (allotype, SIO 15-477 [formerly UCLA W49-122], 383.6 mm TL). (B) P. leucorhynchus (UCLA W53-317, 262.7 mm TL). (C) P. glaucostigmus (UCLA W56-117, 319.4 mm TL). (D) P. productus (UCLA W50-128, 364.5 mm TL).

Pseudobatos buthi, new species
 Spadenose Guitarfish, Guitarra Pala

Etymology.— Named in honor of my mentor, UCLA ichthyologist Donald Buth, who provided me with the opportunity to describe this new species and whose support and guidance has been instrumental in my scientific career.


Fig. 6. The distribution of Pseudobatos buthi, new species, caught by Boyd Walker and colleagues on collecting trips in the 1940s and 1950s. Each red dot represents a different sampling locality. The red star represents the type locality of the holotype.


Kelsi M. Rutledge. 2019. A New Guitarfish of the Genus Pseudobatos (Batoidea: Rhinobatidae) with Key to the Guitarfishes of the Gulf of California. Copeia. 107(3); 451-463. DOI: 10.1643/CI-18-166


Se describe una nueva especie de guitarra en el género Pseudobatos basado en 82 especímenes obtenidos del Golfo de California. Se tomaron sesenta y tres mediciones morfométricas en cada espécimen y en diez especímenes de cada uno de los tres congéneres. En estos datos morfométricos, se realizaron análisis de componentes principales y discriminante lineal para discriminación. Esta nueva especie (∼685 mm TL) es más similar a Pseudobatos productus, pero se diferencia por tener un ancho máximo de disco más estrecho (30–35% vs. 36–38% TL), una distancia más corta desde la fosa nasal al margen del disco (2.8–4.0% vs. 4.2–5.2% TL), un ancho de disco más estrecho en la órbita anterior (12–19% vs. 20–22% TL) y el ancho de la punta de la nariz más estrecha (3% vs. 4–6% TL). Esta especie también tiene una escala menos densa entre las órbitas, y espinas rostrales menos pronunciadas, en comparación con Pseudobatos productus. Además, se provee una clave para las guitarras del Golfo de California.

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