| Balanus trigonus | |
|---|---|
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Scientific classification 
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| Domain: | Eukaryota |
| Kingdom: | Animalia |
| Phylum: | Arthropoda |
| Class: | Thecostraca |
| Subclass: | Cirripedia |
| Order: | Balanomorpha |
| Family: | Balanidae |
| Genus: | Balanus |
| Species: | B. trigonus |
| Binomial name | |
| Balanus trigonus Darwin, 1854 | |
Balanus trigonus, the triangle barnacle, is a species of barnacle in the family Balanidae. It is steep-sided, conical barnacle, has six shell plates and is pink in colour. They are opportunistic fouling organisms that are endemic to the Indo-Pacific region.
Description
Triangle barnacles are medium-sized and roughly cone-shaped, growing to tall. The barnacle shells include a shell wall, comprising plates which are connected by sutures to wrap around to form a circular barrier. In this species, the shell wall is made of six dark pink plates which are covered with white rib-like ridges as well as pores. Each plate is made up of a central triangular portion named the parietes, and overlapping side segments known as radii; the latter, in triangle barnacles, are paler than the parietes, being white or pale pink. The shell also includes a calcareous basis, which forms the bottom of the shell and connects to the ground or material the barnacle is growing on. Triangle barnacles' basis is flat-shaped and pore-covered. The opened top part of the barnacle shell, which connects to the outside, is called the orifice. In this species it is relatively smooth and triangular in shape. It can be closed by the operculum, which is composed of two small shells, known as the tergum and the scutum, divided by a small linear opening; this acts as something of a lid for the barnacle. In living triangle barnacles, often only the scutum can be seen, and has up to six lines of small indentations formed by deep furrows crossed perpendicularly by high ridges. The tergum, meanwhile, has a wide but dulled spur which can take up up to half the opercular valve's width.
References
- "Balanus trigonus". NEMESIS. Retrieved 2023-02-20.
- Rainbow, Philip S. (October 2000). "Dietary uptake of Cd, Cr, and Zn by the barnacle Balanus trigonus: influence of diet composition" (PDF). Marine Ecology Progress Series. 204: 159–168. Bibcode:2000MEPS..204..159W. doi:10.3354/meps204159 – via Scientific Citation Index.
- Ayling, A. M. (1976-07-01). "The strategy of orientation in the barnacle Balanus trigonus". Marine Biology. 36 (4): 335–342. doi:10.1007/BF00389195. ISSN 1432-1793. S2CID 84704999.
- Zullo, Victor A. (1992). "Balanus Trigonus Darwin (Cirripedia, Balaninae) in the Atlantic Basin: An introduced Species?". Bulletin of Marine Science. 50 – via Scientific Citation Index.
- Pope, E. C. (1945-06-25). "A simplified key to the sessile barnacles found on the rocks, boats, wharf piles and other installations in Port Jackson and adjacent waters". Records of the Australian Museum. 21 (6): 351–372. doi:10.3853/j.0067-1975.21.1945.550. ISSN 0067-1975.
Media related to Balanus trigonus at Wikimedia Commons
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