Platyrhinoidis triseriata

(Jordan & Gilbert, 1880)

Thornback guitarfish
Classification: Elasmobranchii Rhinopristiformes Platyrhinidae

Reference of the original description
Jordan, D.S. & Gilbert, C.H. (1880)
Description of a new ray (Platyrhina triseriata), from the coast of California. Proceedings of the United States National Museum, 3(108), 36–38

Image of the original description
No image in first description.

Synonyms / new combinations and misspellings
Platyrhina triseriata, Platyrhinoides triseriata, Platyrhinoides triseriatus, Platyrhinoidis triseriatus, Rhinobatus triseriatus

Platyrhinoidis triseriata
Holotype: USNM: ? Paratype: ANSP: 528 (old: USFC 26893); ZMUB: ? 878 (old: USNM)

Description :

Citation: Platyrhinoidis triseriata (Jordan & Gilbert, 1880): In: Database of modern sharks, rays and chimaeras,, World Wide Web electronic publication, Version 03/2024

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Platyrhinoidis triseriata (Jordan & Gilbert, 1880), © David R. Andrew
Common names
spa Guitarra, spa Guitarra diablo, spa Guitarra espinuda, fra \(T\) Poisson-guitare épineux, eng Guitarfish, eng Thornback, eng Thornback guitarfish

Eastern Pacific: San Francisco, USA to Baja California, Mexico. Source:

Exhibit ovoviparity (aplacental viviparity), with embryos feeding initially on yolk, then receiving additional nourishment from the mother by indirect absorption of uterine fluid enriched with mucus, fat or protein through specialised structures [733]. Inhabits fine sand to mud bottom, often near kelp beds and sometimes abundant on mud flats of coastal bays. Often buries itself in bottom sediments. Ranges from the intertidal zone to 50 m depth [1658]. Solitary or in small groups [1658]. Feeds on small sand-dwelling crustaceans, worms and molluscs. [17641]

Size / Weight / Age
91.0 cm TL (male/unsexed; [17050])

demersal; marine; depth range 0 - 50 m [1658]

shark-references Species-ID=7986;

Parasites (arranged by Jürgen Pollerspöck)
  • Trebius latifurcatus Wilson, 1921 [14624]

  • Pontobdella californiana Burreson & Passarelli, 2015 [23147]