Some 2,100 species have been described. Barnacle adults are sessile; most are suspension feeders with hard calcareous shells, but the Rhizocephala are specialized parasites of other …

As the cirri rapidly extend and retract through the opening at the top of the barnacle, they comb the water for microscopic organisms. They quickly withdraw into their protective shells if they …

Sep 4, 2025 · A prominent feature of barnacle anatomy is the penis, which is both retractable and capable of growing up to eight times the body length (the highest penis-to-body ratio in the …

May 9, 2025 · Barnacles attach to a surface once and stay put for life. Most barnacles, especially the acorn and gooseneck varieties, start life as barnacle larvae drifting in the ocean before …

5 days ago · Northern Liberties residents say windshield barnacles being used at 4th and Spring Garden are predatory, and they question the legality.

Nov 6, 2025 · Barnacle, any of more than 1,000 predominantly marine crustaceans of the subclass Cirripedia highly modified for sedentary life. There are about 850 free-living species …

The anatomy of a barnacle is quite different from other crustaceans. Most notably, they reside upside-down within their protective shells, using their modified appendages, called cirri, to …

Dec 28, 2023 · Scientists have discovered more than 1,400 species of barnacles, with the acorn barnacle being the most commonly known. These animals like to live in rocky intertidal areas …

A Barnacle consumes either animal or plant matter, making its diet omnivorous. The majority are suspension feeders, they remain permanently inside their shells, which are typically made of 6 …

Barnacle defined and explained with descriptions. Barnacle is a small crustacean that attaches itself to marine objects such as rocks, and boats.