Conus nux
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| Broderip , 1833 |
Conus nux ( "nut cone") is the species name a snail from the family of cone snails (genus Conus ), which in the eastern Pacific Ocean on the coast of America from Mexico to Peru is widespread. It feeds on Vielborstern (Polychaeta).
features
Conus nux carries a small, short, conical, crowned snail shell , which in adult snails reaches 1 to 3 cm in length. The body is briefly conical, narrow at the base and wide at the shoulder, which gives it a club-like outline. The thread is low to flat. The protoconch consists of two and a half smooth whorls, followed by 6 to 7 whorls of the thread in the teleoconch. These have stripes and are weakly covered with tubercles (humps). The circumference of the body is smooth, halfway towards the base with some larger spaced spiral grooves between which there are indistinct granular surfaces.
The basic color of the case is greyish-white with alternating brown marbling and often with indistinct white bands on the circumference of the body near the shoulder and halfway towards the base. The base is colored dark purple.
distribution and habitat
Conus nux is in the eastern Pacific Ocean on the coast of Central America and South America from the Gulf of California ( Mexico ) to northern Peru and to Ecuador to the Galapagos Islands as well as on the Revillagigedo Islands , Cocos Island (Costa Rica) and Clipperton Island spread. Conus nux is the most common species of cone snail on the American Pacific coast, but it is much rarer on the Galapagos Islands. It lives in shallow sea depths both on sandy subsoil and on rock.
The development cycle of Conus nux is unknown.
Diet and Parasites
The prey of Conus nux consists of Vielborstern he with his Radulazähnen stands and using poison from the venom gland immobilized. During investigations on the Galapagos Islands , Conus nux mainly ate the nereids Neris jacksoni and a member of the genus Neanthes , but also bristle worms of the families Syllidae , Polynoidae and Lumbrineridae .
From Nicaragua there is a report of how a Conus nux is parasitized by a parasitic snail from the genus Odostomia (family Pyramidellidae ) and does not react to the snail's stinging and blood sucking. The parasitic snail's blood meal lasted only a few minutes.
literature
- Heinrich Carl Küster , Heinrich Conrad Weinkauff : Coneae or Conidae, I. Conus Linné. In: Systematic Conchylia Cabinet by Martini and Chemnitz. Volume 4, section 2. Verlag von Bauer and Raspe (Emil Küster), Nuremberg 1875. pp. 1-403, here no. 149 Conus nux Broderip, pp. 202f.
- Angeline Myra Keen 1971. Sea shells of Tropical West America: Marine mollusks from Baja California to Peru. Stanford University Press, Stanford (California) 1971. 1064 pages.
Web links
Individual evidence
- ^ Alan Kohn, in: Claus Nielsen (2013): Life cycle evolution: was the eumetazoan ancestor a holopelagic, planktotrophic gastraea? . BMC Evolutionary Biology 13, Art. 171, p. 9.
- ↑ James Nybakken (1978): Population Characteristics and Food Resource Utilization of Conus in the Galapagos Islands. Pacific Science 32 (3), pp. 271-280.
- ^ SJ Al López (1986): Go Micro, Young Man! Hawaiian Shell News 23 (3), p. 3f., Here p. 4.