Guitarfish
Guitarfish are rays with a shark-like tail and guitar-shaped head.
The guitarfish, often called shovelnose rays, belong to the ray family Rhinobatidae. Their bodies are elongated, with a flattened head and trunk and small wings similar to those of rays. They look like a cross between a shark and a ray: the tail is shark-like, but in many species the head is triangular or shaped like a guitar, rather than forming the disc shape seen in other rays when the pectoral fins fuse. These fish live in tropical, subtropical, and warm temperate waters around the world.
In Australia and New Zealand, they are commonly known as shovelnose rays or shovelnose sharks. Guitarfish are bottom feeders that bury themselves in mud or sand, eating worms, crabs, and clams. Some can tolerate salt, fresh, and brackish water, and they generally stay close to coastlines or in estuaries. According to the myDiveguide.com database, the Maldives—especially the Northern Atolls—has the most recorded guitarfish encounters, with the dive site Maroshi Thila near Shaviyani Atoll topping the list worldwide.
Guitarfish reproduce through ovoviviparity: the embryo develops inside an egg within the mother until it hatches, which is typical of rays. Evolutionarily, rays (including guitarfish) are part of an ancient lineage of cartilaginous fishes. Fossil denticles resembling those of modern chondrichthyans date back to the Ordovician, with the oldest clear cartilaginous fish fossils from the middle Devonian. A group within this family called Neoselachii appeared by the Triassic, with the best-known fossils from the Jurassic; today, this group includes sharks, sawfish, rays, and skates.
Classification of Rhinobatidae has been complicated. Many fish once placed here have been moved to other families. Nelson’s 2006 *Fishes of the World* listed four genera: *Aptychotrema*, *Rhinobatos*, *Trygonorrhina*, and *Zapteryx*. Since then, *Aptychotrema*, *Trygonorrhina*, and *Zapteryx* have been reclassified into Trygonorrhinidae. Other former members, like *Platyrhinoidis* and *Rhina*, also got their own families. The genus *Glaucostegus* is now recognized as distinct from *Rhinobatos* and placed in Glaucostegidae. *Rhinobatos* itself has been split into three genera based on genetics and morphology: *Rhinobatos*, *Acroteriobatus*, and *Pseudobatos*. *Tarsistes* is uncertain and may be a synonym of *Pseudobatos*. A 2021 study of fossils from Bolca, Italy, moved two extinct sp
- field
- Marine biology
- known_for
- Body form intermediate between sharks and rays; bottom feeders that bury in mud or sand
- habitat
- Tropical, subtropical, and warm temperate waters worldwide; close to beaches or in estuaries
- reproduction
- Ovoviviparous; embryo matures inside an egg within the mother
- conservation_status
- Illegal trade and fishing threaten some species, especially critically endangered Pseudobatos horkelii
Lore & Background
Guitarfish belong to the ancient lineage of cartilaginous fishes, with fossil denticles resembling those of today's chondrichthyans dating at least as far back as the Ordovician. The oldest unambiguous fossils of cartilaginous fish date from the middle Devonian. A clade within this diverse family, the Neoselachii, emerged by the Triassic, with the best-understood neoselachian fossils dating from the Jurassic. This clade is represented today by sharks, sawfish, rays and skates.
There are a number of issues in the taxonomy of Rhinobatidae. Many fish once placed in this family have been moved to their own families, such as Trygonorrhinidae, Glaucostegidae, and Rhinidae. The genus Rhinobatos has been split into three genera based on genetic and morphological considerations: Rhinobatos, Acroteriobatus, and Pseudobatos. A 2021 re-evaluation of material from the Konservat-Lagerstätten of Bolca in Italy suggested that two fossil species be excluded from Rhinobatos and assigned to new genera.
Guitarfish are bottom feeders that bury themselves in mud or sand and eat worms, crabs, and clams. Some can tolerate salt, fresh, and brackish water. They generally live close to the beach/coastline or in estuaries. Per the myDiveguide.com database, the Maldives is the area with the most recorded guitarfish encounters, mainly in the Northern Atolls, with the dive site Maroshi Thila near Shaviyani Atoll having the most recorded encounters worldwide.
Reader's Guide
Guitarfish, as members of the ancient lineage of cartilaginous fishes, provide insight into the evolutionary transition between sharks and rays. Their body form, intermediate between those of sharks and rays, illustrates a key morphological adaptation within the Neoselachii clade that emerged by the Triassic. The taxonomic complexity of the family Rhinobatidae, with multiple reclassifications and splits based on genetic and morphological considerations, highlights ongoing scientific efforts to understand their evolutionary relationships. The presence of fossil species from the Konservat-Lagerstätten of Bolca in Italy further underscores their deep evolutionary history. Ecologically, guitarfish are bottom feeders that bury in mud or sand and can tolerate a range of salinities, making them important components of coastal and estuarine ecosystems. Their conservation is threatened by illegal trade and fishing, particularly for the critically endangered Pseudobatos horkelii, which poses a significant risk to this ancient group. The Maldives, especially the Northern Atolls and the dive site Maroshi Thila, is noted as a hotspot for guitarfish encounters, indicating areas of potential ecological importance.
Did You Know?
- Guitarfish are also referred to as shovelnose rays or shovelnose sharks in Australia and New Zealand.
- The dive site with the most recorded guitarfish encounters worldwide is Maroshi Thila near Shaviyani Atoll in the Maldives.
- Guitarfish can be ovoviviparous; the embryo matures inside an egg within the mother until it is ready to hatch.
- Some guitarfish can tolerate salt, fresh, and brackish water.
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