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How old are the shells of Balanus barnacles?

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  • Balanus is a genus of barnacles in the family Balanidae of the subphylum Crustacea. Fossil shells of Balanus from Pliocene. This genus is known in the fossil record from the Jurassic to the Quaternary periods (age range: from 189.6 to 0.0 million years ago.).
image-How old are the shells of Balanus barnacles?

How big does a Balanus perforatus barnacle get?

  • B. perforatus is a large barnacle which grows up to 30 millimetres (1.2 in) in both diameter and height. Its shape resembles a volcano with steep sloping sides. The six fused lateral calcareous plates are pale purplish-brown and often ridged vertically. They often separate near the top leaving jagged ridges.

What's the difference between acorn barnacle and Balanus glandula?

  • Acorn barnacle species can be difficult to identify in photographic monitoring, but Balanus glandula can be distinguished from Chthamalus fissus/dalli by its larger size (to 22 mm), whiter color, and diamond-shaped operculum. The configurations of their exoskeletal plates also differ.

What kind of animal is the acorn barnacle?

  • Balanus glandula Balanus glandulaDarwin, 1854 Common name(s): Acorn barnacle, white buckshot barnacle (when small) Synonyms: Phylum Arthropoda Subphylum Crustacea Class Maxillopoda Subclass Thecostraca Infraclass Cirripedia Superorder Thoracica Order Sessilia Suborder Balanomorpha Superfamily Balanoidea Family Balanidae
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