Calliaster kanak
A sea star with irregular spines, found off New Caledonia and New Zealand.
Calliaster kanak is a sea star belonging to the family Goniasteridae, recorded in waters off New Caledonia and New Zealand. Its name honors the Kanak people, the indigenous inhabitants of New Caledonia.
This species was once mistaken for *Calliaster erucaradiatus* in New Zealand and later for *Calliaster elegans*. It differs from *C. erucaradiatus* by having irregularly arranged marginal spines, only one spine on each superomarginal plate, strongly convex superomarginal plates, and five to six furrow spines. Compared to *C. elegans*, it has a single, irregularly placed, prominent pointed spine on both the superomarginal and inferomarginal series, whereas *C. elegans* has three to four pointed spines on the inferomarginal plates and short conical spines on the superomarginal plates.
The body is star-shaped to strongly star-shaped, with pointed, elongated arms. On the disk, the abactinal plates—including the carinal series and most interradial regions—have raised bases that bear conical spines. These plates are confined to the disk; the arms lack them because the superomarginal plates meet along the arm. There are about eight to ten superomarginal plates per arm side (16 to 20 per interradius), which are smooth, very swollen, and each bears a single, irregularly directed long spine. The actinal surface is small, with roughly two to three plate series mostly on the disk, each plate carrying a single spine. Five to six blunt-tipped furrow spines form a straight row, while two thick, long, blunt subambulacral spines are arranged in a transverse series.
This sea star is found off New Caledonia at depths of 180 to 470 meters and on the Taupo Seamount off New Zealand at 90 to 153 meters.
Quick Facts
- Genus
- Calliaster
- Species
- kanak
Facts from the source article.
Lore & Background
The species epithet kanak honors the Kanak, the native people of New Caledonia. This species was previously misidentified as Calliaster erucaradiatus from New Zealand and later as Calliaster elegans. It is distinguished from C. erucaradiatus by its marginal spines being in an irregular arrangement, having only one spine on all superomarginal plates, having strongly convex superomarginal plates, and possessing 5 to 6 furrow spines. It is distinguished from C. elegans primarily by the presence of a single, irregularly arranged and prominent, pointed spine on both superomarginal and inferomarginal series, whereas C. elegans has 3 to 4 pointed spines on inferomarginal plates and relatively short conical spines on the superomarginal plate surface, both in series.
The species has a stellate to strongly stellate body with pointed, elongate arms. Abactinal plates on the disk, carinal series, and most interradial regions have distinctly produced bases bearing conical spines. Abactinal plates are limited to the disk, with none on the arms where the superomarginals are abutted. Superomarginal plates, approximately 8 to 10 along the arm side (16 to 20 per interradius), are abutted across most of the arm; their surfaces are smooth, highly tumid, and bear a single, irregularly directed elongate spine. The actinal surface is relatively small, with approximately 2 to 3 plate series primarily isolated to the disk; all actinal plates bear a single spine. Furrow spines number 5 to 6, are blunt-tipped, and are arranged in a straight series. Subambulacral spines number two, are thick, elongate, and blunt, arranged in a transverse series.
Reader's Guide
Calliaster kanak is significant as a distinct species within the Goniasteridae family, resolved from earlier misidentifications as Calliaster erucaradiatus and Calliaster elegans. Its taxonomic clarification highlights the importance of careful morphological comparison, particularly the irregular arrangement of marginal spines and the single spine on superomarginal plates, which separate it from related species. The species is known from off New Caledonia at depths of 180–470 meters and from the Taupo Seamount off New Zealand at 90–153 meters, indicating a restricted geographic and bathymetric range. Its description includes a stellate body with pointed arms, abactinal plates limited to the disk, and distinctive spination patterns including 5 to 6 furrow spines and two subambulacral spines. The species' legacy lies in its contribution to the taxonomy of deep-sea starfish and its connection to the Kanak people through its etymology, though no further cultural or ecological significance is documented in the source.
Did You Know?
- This species was previously misidentified as Calliaster erucaradiatus and later as Calliaster elegans.
- It has 5 to 6 blunt-tipped furrow spines arranged in a straight series.
- It is known from the Taupo Seamount off New Zealand at depths of 90–153 meters.
Frequently Asked Questions
What is Calliaster kanak?
Calliaster kanak is a deep-water sea star placed in the family Goniasteridae, known from the coastal shelves of New Caledonia and New Zealand. Its specific epithet was chosen to honor the Kanak, the indigenous people of New Caledonia.
Where does Calliaster kanak live and at what depth?
In New Caledonian waters it has been recorded between roughly 180 and 470 meters, whereas in New Zealand it occurs in shallower depths of about 90 to 153 meters. Both ranges put it squarely in the deep-sea zone.
How do you tell Calliaster kanak apart from Calliaster erucaradiatus and Calliaster elegans?
It was long misidentified as both species before being recognized as distinct. Versus C. erucaradiatus it shows irregularly arranged marginal spines, a single spine on each superomarginal plate, strongly convex superomarginal plates, and five to six furrow spines; versus C. elegans it bears a single, irregularly positioned, prominent pointed spine.
What are Calliaster kanak's key physical traits?
Each arm side carries eight to ten superomarginal plates, and the animal has two subambulacral spines alongside five to six furrow spines. Its overall spination is notably irregular, a feature that helps separate it from look-alike species.
Why is Calliaster kanak important to marine biology?
Its long history of being confused with two other Calliaster species makes it a useful case study in how easily deep-water echinoderms can be misidentified, underscoring the need for careful morphological comparison. It also stands as a living tribute to the Kanak people of New Caledonia through its nomenclature.
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