Common goose barnacle facts
Lepas anatifera Linnaeus, 1758.
OTHER COMMON NAMES
English: Goose barnacle, gooseneck barnacle; French: Anatife; Portuguese: Anatifas, conchas marrecas, lepas.
Average physique size is 9.eight in (25 cm); largest specimen discovered was 29.5 in (75 cm). Color of physique is darkish brown and calcareous plates are whitish. Body divided into two areas: the peduncle (stalk), and the capitulum. The peduncle is fleshy, massive, and lengthy, and it attaches to the substrate utilizing the primary antennae. The physique is compressed laterally, coated by two folds of mantle, the place 5 skinny calcareous plates are hooked up. The carina is a dorsal unpaired plate, which types a central keel. Paired scuta are massive, and are situated on the anterior area of the physique. Paired terga are brief and are situated on the posterior-most area of the physique. Six pairs of thoracic, biramous cirri bordered with chaetae are seen by way of an aperture current within the mantle cavity. The adductor muscle closes the mantle cavity. In the mantle cavity, there’s a brief head, a thorax with six thoracic, biramous limbs, a mouth, and an extended, setose penis.
Cosmopolitan in tropical and temperate seas.
Small colonies connect to floating objects similar to logs and ships.
Cirri, stalk, and mantle are coated by sensory bristles (chaetae). Stimulation of these chaetae causes the withdrawal of the physique and the mantle aperture to shut.
FEEDING ECOLOGY AND DIET
Plankton is collected with actions by the thoracic cirri. From between plates, cirri are prolonged and unfold out like a fan-shaped internet; cirri are then withdrawn and the aperture is closed. Filtering of food from water is completed rhythmically by way of mixed actions of the cirri and the closure of the aperture; food is then transferred to mouthparts.
Hermaphroditic, however with out complemental males. The lengthy, extensible penis is inserted into the mantle cavity of adjoining people. Eggs brood inside the mantle cavity and nauplii hatch from eggs. After a number of molts, larvae attain the cyprid stage. The cyprid attaches to the substrate utilizing its antennae and begins metamorphosis; throughout this stage it may develop virtually 0.039 in (1 mm) per day, attaining a size of three.9 in (10 cm) inside 113 days.
Not listed by the IUCN.
SIGNIFICANCE TO HUMANS
Scientific title means “goose carrier” as a result of they resemble goose eggs. They connect to ships.