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30 August 2019 A New Guitarfish of the Genus Pseudobatos (Batoidea: Rhinobatidae) with Key to the Guitarfishes of the Gulf of California
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Abstract

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.

© 2019 by the American Society of Ichthyologists and Herpetologists
Kelsi M. Rutledge "A New Guitarfish of the Genus Pseudobatos (Batoidea: Rhinobatidae) with Key to the Guitarfishes of the Gulf of California," Copeia 107(3), 451-463, (30 August 2019). https://doi.org/10.1643/CI-18-166
Received: 14 December 2018; Accepted: 5 June 2019; Published: 30 August 2019
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