Tetrosomus reipublicae
A boxfish with two dorsal spines and a quadrangular body.
The smallspine turretfish (Tetrosomus reipublicae) is a marine ray-finned fish in the boxfish family Ostraciidae. Its range covers the Indo-Pacific region. This fish has a quadrangular body and two spines along its back.
The species was first formally described in 1930 by Australian ichthyologist Gilbert Percy Whitley, who named it *Triorus reipublicae* based on a specimen from Moreton Bay, Queensland. Whitley’s work drew on *Lactophrys reipublicae*, a name coined by James Douglas Ogilby in 1913 but considered a nomen nudum, plus additional material. Some authorities treat *Tetrosomus concatenatus* as a synonym of the Western Atlantic *Lactophrys triqueter*, meaning Indo-Pacific fish previously labeled *T. concatenatus* actually belong to this species. The 5th edition of *Fishes of the World* places the genus *Tetrosomus* in the family Ostraciidae, suborder Ostracioidea, order Tetraodontiformes.
The genus name *Tetrosomus* combines *tetra* (“four”) and *somus* (“body”), referring to the fish’s four-sided shape. The specific name *reipublicae* means “commonwealth,” an allusion to the Commonwealth of Australia—a name Ogilby invented for Australian populations of *L. concatenatus*.
Coloration ranges from greenish to brown or pinkish. Juveniles have dark spots, while adults develop more blue spots and lines. Two spines sit on the dorsal ridge. The carapace is triangular in cross-section. The mouth is small, the snout pointed, and the dorsal fin lies farther forward than the anal fin. Maximum total length is 30 cm (12 in).
This species lives in tropical Indo-west Pacific waters, from East Africa through Indonesia north to southern Japan and south to Australia. In Australia, it appears from Albany to northeast of the Monte Bello Islands, Western Australia, and from north Queensland south to Tathra, New South Wales, as well as in the Lord Howe Province in the Tasman Sea. Its habitats include inshore reefs and seagrass meadows.
Quick Facts
- Taxon
- Tetrosomus reipublicae
Facts from the source article.
Lore & Background
The smallspine turretfish was first formally described as Triorus reipublicae in 1930 by the Australian ichthyologist Gilbert Percy Whitley, with its type locality given as Moreton Bay in Queensland. Whitley based his description on Lactophrys reipublicae described by James Douglas Ogilby in 1913, which is a nomen nudum, plus additional material. The taxon Tetrosomus concatenatus is regarded by some authorities as a synonym of the Western Atlantic Lactophrys triqueter, and Indo-Pacific specimens assigned to T. concatenatus are actually this species. The 5th edition of Fishes of the World classifies the genus Tetrosomus within the family Ostraciidae in the suborder Ostracioidea within the order Tetraodontiformes.
The genus name Tetrosomus combines tetra, meaning 'four', and somus, meaning 'body', referring to the quadrangular shape of the body. The specific name reipublicae means 'commonwealth', an allusion to the Commonwealth of Australia, a name invented by Ogilby for the Australian populations of L. concatenatus.
The smallspine turretfish is greenish to brown or pinkish, with juveniles marked by dark spots; as they grow, the numbers of blue spots and lines increase. There are two spines on the dorsal ridge. The carapace has a triangular cross-section. The mouth is small and there is a pointed snout. The dorsal fin is located further forward compared to the anal fin. This species occurs in inshore reefs and seagrass meadows.
Reader's Guide
The smallspine turretfish is a member of the boxfish family Ostraciidae, characterized by its quadrangular body and two dorsal spines. Its description history involves taxonomic uncertainty: Whitley's 1930 description relied on Ogilby's earlier nomen nudum, and some authorities consider Tetrosomus concatenatus a synonym of a Western Atlantic species, with Indo-Pacific specimens assigned to that name actually being T. reipublicae. This species is found across the tropical Indo-west Pacific, from East Africa to southern Japan and Australia, inhabiting inshore reefs and seagrass meadows. Its maximum length is 30 cm. The etymology reflects its Australian connection, with the specific name reipublicae meaning 'commonwealth'. The species is notable for its color changes with age, from dark-spotted juveniles to adults with increasing blue spots and lines.
Did You Know?
- The smallspine turretfish was first described as Triorus reipublicae in 1930 by Gilbert Percy Whitley.
- Its type locality is Moreton Bay in Queensland.
- The specific name reipublicae means 'commonwealth', referring to the Commonwealth of Australia.
- Juveniles have dark spots, while adults develop increasing numbers of blue spots and lines.
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