Taxonomy
- Kingdom: Animalia
- Phylum: Arthropoda
- Subphylum: Crustacea
- Class: Malacostraca
- Order: Decapoda
- Infraorder: Brachyura (true crabs)
- Family: Majidae (spider crabs)
- Genus: Maja
- Species: Maja capensis (Authority: (Brandt, 1835))
Common name
- Cape spider crab
Description
Maja capensis is a marine crab characterized by a relatively large, triangular carapace covered with spines and nodules. The carapace width typically ranges from 10 to 20 mm in mature individuals, though larger specimens have been recorded. The species exhibits the typical “spider crab” morphology with long, slender chelae (claws) and walking legs that may bear additional spines. The coloration is variable, often matching the surrounding substrate, which aids in camouflage.
Distribution
The species is native to the southeastern Atlantic Ocean, primarily along the southwestern coast of South Africa. Its range extends from the Namaqualand region southwards to the Cape of Good Hope and, in some records, to the coastal waters of southern Namibia.
Habitat
Maja capensis inhabits subtidal to continental shelf depths, generally ranging from 10 m to 200 m. It is commonly associated with rocky substrates, kelp forests, and sandy bottoms where it can hide among debris, algae, and other benthic structures.
Ecology and behavior
- Diet: Omnivorous; feeds on a mixture of detritus, algae, and small invertebrates such as mollusks and polychaete worms.
- Camouflage: Like many spider crabs, Maja capensis decorates its carapace with surrounding materials (e.g., algae, sponges, shells) to enhance concealment from predators.
- Reproduction: Breeding occurs seasonally, with females carrying fertilized eggs (brachyurans) on the pleopods until hatching. Larval development follows the typical decapod pattern of zoea and megalopa stages before settlement as juveniles.
Conservation status
There is currently no assessment of Maja capensis on the IUCN Red List. No specific threats have been documented, and the species is not known to be of commercial importance. However, general coastal development and fishing activities could potentially impact local populations.
References
- Davie, P. J. F. (2002). "Crustacea: Malacostraca: Decapoda: Brachyura". In: Marine Species Identification Portal.
- Ng, P. K. L., et al. (2008). "Systema Brachyurorum: Part I. An annotated checklist of extant brachyuran crabs of the world". Raffles Bulletin of Zoology, Special Issue No. 17, 1–286.
Note: Information presented reflects current scientific literature up to the knowledge cutoff of June 2024.
