Hexaplex nigritus

Hexaplex nigritus, the Northern Radix or Black-and-White Murex or Black Murex, is a species of sea snail, a marine gastropod mollusc in the family Muricidae, the murex snails or rock snails. It is commonly known as the black murex shell.[1]

Hexaplex nigritus (Black Murex Shell)
Shell of Hexaplex nigritus (Philippi, 1845), and operculum measuring 78.7 mm in height, from Concepcion Bay, in Mexico.
Scientific classification
Kingdom:
Animalia
Phylum:
Mollusca
Class:
Gastropoda
(unranked):
clade Caenogastropoda
clade Hypsogastropoda
clade Neogastropoda
Superfamily:
Muricoidea
Family:
Muricidae
Subfamily:
Muricinae
Genus:
Hexaplex
Species:
H. nigritus
Binomial name
Hexaplex nigritus
(Philippi, 1845)
Synonyms[1]
  • Hexaplex (Muricanthus) nigritus (Philippi, 1845)
  • Murex melanoleuca Mørch, 1852
  • Murex nigrita sensu Meuschen Mørch, 1852
  • Murex nigritus Philippi, 1845 (basionym)
  • Muricanthus nigritus (Philippi, 1845)

Distribution

The black murex shell is commonly found in the Gulf of California (Sea of Cortez), in the Western Mexico.[2]

Habitat

These sea snails can be found in the intertidal and subtidal waters, with sand and gravel substrate, at depths up to 60 m.[3]

A shell of Hexaplex nigritus from Gulf of California, on display at the Museo Civico di Storia Naturale di Milano

Description

Shells of Hexaplex nigritus can reach a length of 75–200 millimetres (3.0–7.9 in).[2] These large shells are black and white with black or dark brown stripes. The shell surface bears short spikes around the body whorl and spire. The aperture is porcelaneous white.

This species is quite similar to Hexaplex radix. The shells of these two species mainly differ in the length, width and in the proportion of black versus white. Moreover, shells of H. nigritus are more oblong and show more spines in black.[4]

Biology

These sea snails feed primarily on clams.

References
  1. Hexaplex nigritus (Philippi, 1845). Retrieved through: World Register of Marine Species on 3 March 2012.
  2. "Hexaplex (Muricanthus) nigritus". Gastropods.com. Retrieved 12 January 2019.
  3. R. Cudney-Bueno and K. Rowell [THE BLACK MUREX SNAIL, HEXAPLEXNIGRITUS (MOLLUSCA, MURICIDAE), IN THE GULFOF CALIFORNIA, MEXICO: II. GROWTH, LONGEVITY, AND MORPHOLOGICAL VARIATIONS WITH IMPLICATIONS FOR MANAGEMENT OF A RAPIDLY DECLINING FISHERY]
  4. Whatsup San Carlos

Bibliography
  • A. P. H. Oliver, James Nicholls - Hamlyn Guide to Shells of the World
  • Angeline Myra Keen - Sea Shells of Tropical West America
  • B. Garrigues, J-P. Pointier D. Merle - Fossil and Recent Muricidae of the World
  • Jerome M. Eisenberg - Collector's guide to Seashells of the World
  • Merle D., Garrigues B. & Pointier J.-P. (2011) Fossil and Recent Muricidae of the world. Part Muricinae. Hackenheim: Conchbooks. 648 pp. [


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