Cirrhitus
A genus of hawkfishes found on tropical reefs worldwide.
Cirrhitus is a genus of marine ray-finned fish belonging to the hawkfish family, Cirrhitidae. Members of this genus inhabit tropical reefs across the globe.
The genus was first described in 1803 by French naturalist Bernard Germain de Lacépède, who made it a monotypic genus for his new species *Cirrhitus maculatus* from Mauritius. It was later determined that Lacépède’s *C. maculatus* was the same as *Labrus pinnulatus*, a species described in manuscript by German naturalist Johann Reinhold Forster from Tahiti. Forster’s work formed the basis of a description published in 1801 by Johann Gottlob Schneider in the *Systema Ichthyologiae* by Bloch and Schneider, though the Catalog of Fishes credits the name to Forster. The genus name comes from *cirrhus*, meaning a lock of hair or barbel. Lacépède did not explain what feature the name refers to. It may allude to the unbranched pectoral fin rays, which he called “barbillons” (barbels) in his description of the type species, thinking they were false pectoral fins. Another possibility is that the name refers to the cirri on the tips of the dorsal fin spines, though Lacépède did not mention this.
Currently recognized species include: *Cirrhitus albopunctatus*, *Cirrhitus atlanticus* (West African hawkfish), *Cirrhitus pinnulatus* (stocky hawkfish), and *Cirrhitus rivulatus* (giant hawkfish). American ichthyologist Leonard Peter Schultz recognized three species from the widespread *C. pinnulatus*: *C. spilotoceps* from the Red Sea, *C. pinnulatus* from the wider Indo-Pacific (excluding Hawaii), and *C. maculosus* from Hawaii and Johnston Atoll. In his 1963 review of the family, John Ernest Randall treated these as subspecies rather than full species. The Catalog of Fishes recognizes *C. spilotoceps* as valid and treats *C. maculosus* as a subspecies of *C. pinnulatus*, while FishBase considers all these names synonyms of *C. pinnulatus*.
These hawkfishes have a deep body that is not highly compressed laterally. They have large heads with blunt snouts and a fringe of cirri on the rear edge of the front nostril. The mouth is moderately large, with an outer row of canine teeth and an inner row of villiform teeth; teeth also appear on the roof of the mouth. The upper edge of the preoperculum may be smooth or finely serrated, and the gill cover has two flattened spines.
Quick Facts
- Taxon
- Cirrhitus
- Type Species
- Cirrhitus maculatus
- Type Species Authority
- Lacepède, 1803
Facts from the source article.
Lore & Background
The genus Cirrhitus was first formally described in 1803 by the French naturalist Bernard Germain de Lacépède as a monotypic genus for his newly described species from Mauritius, Cirrhitus maculatus. It was later shown that Lacépède's C. maculatus was synonymous with Labrus pinnulatus described in manuscript by the German naturalist Johann Reinhold Forster from Tahiti. Forster's description was the basis of the description published in 1801 by Johann Gottlob Schneider in his and Marcus Elieser Bloch's Systema Ichthyologiae, although Catalog of Fishes attributes the name to Forster. The name of this genus is derived from cirrhus meaning a 'lock of hair' or a 'barbel'; Lacépède did not explain what feature the name alludes to. It may allude to the unbranched pectoral fin rays which Lacépède termed as 'barbillons', meaning 'barbels', in his description of the type species, or to the cirri extending from the tips of the spines in the dorsal fin, although Lacépède did not mention this feature.
Cirrhitus hawkfishes have a deep body which is not highly laterally compressed, large heads with a blunt snout, and a fringe of cirri on the posterior margin of the anterior nostril. They have a moderately large mouth with two types of teeth: an outer row of canines and an inner row of villiform teeth, plus teeth on the roof of the mouth. The dorsal fin has 10 spines with deep notches between them, each spine tip bearing a large tuft of cirri, and 11-12 soft rays. The lower 7 pectoral fin rays are robust, with deeply incised membranes, and are notably longer than other pectoral fin rays; the upper 1 and lower 7 pectoral fin rays are unbranched. The scales are smooth, and the intraorbital space lacks scales. Published sizes vary from a standard length of 16 cm for C. atlanticus to a total length of 60 cm for C. rivulatus.
The currently recognized species are Cirrhitus albopunctatus, Cirrhitus atlanticus (West African hawkfish), Cirrhitus pinnulatus (stocky hawkfish), and Cirrhitus rivulatus (giant hawkfish). The American ichthyologist Leonard Peter Schultz recognized three species from the widespread C. pinnulatus: C. spilotoceps from the Red Sea, C. pinnulatus from the wider Indo-Pacific except Hawaii, and C. maculosus from Hawaii and Johnston Atoll. John Ernest Randall in his 1963 review treated them as subspecies. Catalog of Fishes recognizes C. spilotoceps as valid and treats C. maculosus as a subspecies of C. pinnulatus, while FishBase treats these names as synonyms of C. pinnulatus.
Reader's Guide
Cirrhitus hawkfishes are notable for their distinctive morphology, including the unbranched pectoral fin rays and the tufts of cirri on the dorsal fin spines, which are reflected in the genus name's possible derivations. The taxonomic history of the genus involves early confusion between Lacépède's type species and Forster's earlier description, a dispute that remains unresolved in attribution. The genus is found on tropical reefs worldwide except the western Atlantic, preferring hard substrates such as coral reefs, rocky reefs, and rocky bottoms. The species vary significantly in size, from the 16 cm C. atlanticus to the 60 cm C. rivulatus. The classification of species within Cirrhitus has been subject to differing interpretations: Schultz recognized three species from the widespread C. pinnulatus, Randall treated them as subspecies, and modern sources like Catalog of Fishes and FishBase disagree on the validity of some taxa. This ongoing taxonomic uncertainty highlights the complexity of defining species boundaries in widespread reef fishes.
Did You Know?
- The genus name Cirrhitus may derive from cirrhus meaning 'lock of hair' or 'barbel', possibly referring to the unbranched pectoral fin rays Lacépède called 'barbillons'.
- Lacépède's type species Cirrhitus maculatus was later shown to be synonymous with Labrus pinnulatus described by Johann Reinhold Forster from Tahiti.
- The lower 7 pectoral fin rays in Cirrhitus are robust, with deeply incised membranes, and are notably longer than the other pectoral fin rays.
- The giant hawkfish (Cirrhitus rivulatus) reaches a total length of 60 cm, while the West African hawkfish (Cirrhitus atlanticus) has a standard length of only 16 cm.
Frequently Asked Questions
What is Cirrhitus?
Cirrhitus is a genus of ray-finned marine fish placed within the hawkfish family, Cirrhitidae. Its members are small, reef-associated predators that you'll find on tropical coral reefs around the entire globe.
Who originally described Cirrhitus and when?
French naturalist Bernard Germain de Lacépède erected the genus in 1803, basing it on a single species he named C. maculatus from Mauritius. That type species was later shown to be the same fish Johann Reinhold Forster had sketched from Tahiti under the name Labrus pinnulatus.
How many species are in the genus Cirrhitus?
Four species are currently recognized. They span a notable size gap, from C. atlanticus at roughly 16 cm in standard length up to C. rivulatus, which can reach about 60 cm in total length.
What fin counts define Cirrhitus?
Every species in the genus bears exactly 10 spines in the dorsal fin. The anal fin is a bit more variable, carrying anywhere from 5 to 7 soft rays depending on which species you're looking at.
Where do Cirrhitus species live and how do they behave?
All four recognized species occupy tropical reef habitats across the world's oceans. As typical hawkfishes, they are largely sedentary ambush predators that perch on hard reef structures and strike at small fish and invertebrates that drift close enough to grab.
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