Spotfin scorpionfish

Lore & Background

The spotfin scorpionfish was first formally described in 1964 as Sebastapistes neilseni by the South African ichthyologist J. L. B. Smith, with the type locality given as off Durban in South Africa. In 2001, the Russian biologist Sergey Mandritsa placed this species in the monotypic genus Neoscorpaena. The genus name translates as 'new Scorpaena', as this species is similar to fishes in the genus Scorpaena but is distinguished by having a slit behind the gill arches. The specific name honours the Danish zoologist Jørgen G. Nielsen of the Zoological Museum of Copenhagen in recognition of the assistance he gave to Smith's research.

The spotfin scorpionfish has a dorsal fin containing 12 spines and 9-10 (typically 10) soft rays, an anal fin with 3 spines and 5 soft rays, and 18 fin rays in the pectoral fins. The large head has a length equivalent to 45.9-48.6% of standard length, while the large eyes have an orbital diameter of 12.0-17.1% of standard length, decreasing markedly as the fish grows. There is no lateral lacrimal spine; the anterior lacrimal spine is rounded and not shaped like a spine, while the posterior lacrimal spine has a triangular shape. The preoperculum has 5 spines with an extra spine on the uppermost spine. The overall colour is reddish with yellow blotches on the upper head and body, and normally a dark blotch near the rear of the spiny part of the dorsal fin.

The spotfin scorpionfish is found in the southwestern Indian Ocean, occurring off the eastern coast of South Africa, as well as Madagascar, Seychelles, Mauritius and Réunion. It is a demersal fish found at depths between 40 and 507 m. Little is known about the biology of this species.

Reader's Guide

The spotfin scorpionfish is notable as the only known member of the genus Neoscorpaena, a monotypic genus established in 2001 by Sergey Mandritsa. Its taxonomic history began with J. L. B. Smith's 1964 description as Sebastapistes neilseni, based on a specimen from off Durban, South Africa. The genus name reflects its similarity to Scorpaena, with the distinguishing feature being a slit behind the gill arches. The specific name honors Danish zoologist Jørgen G. Nielsen for his assistance to Smith. The species is characterized by detailed morphological features, including a dorsal fin with 12 spines and 9-10 soft rays, an anal fin with 3 spines and 5 soft rays, and 18 pectoral fin rays. Its large head and eyes, along with the presence of vomerine and palatine teeth and a bilobed pectoral fin, are key descriptors. The fish reaches a maximum standard length of 21.6 cm and is reddish with yellow blotches and a dark blotch on the dorsal fin. Its distribution spans the southwestern Indian Ocean, including South Africa, Madagascar, Seychelles, Mauritius, and Réunion, at depths from 40 to 507 m. Despite these details, little is known about its biology, leaving much to be discovered about this monotypic scorpionfish.

Did You Know?

• It was first described in 1964 by South African ichthyologist J. L. B. Smith as Sebastapistes neilseni.
• The specific name nielseni honors Danish zoologist Jørgen G. Nielsen.
• This species is found at depths between 40 and 507 m in the southwestern Indian Ocean.