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One barnacle may inseminate another up to eight times, and up to six concurrent penetrations may occur. The penis degenerates after copulation, and a new one is regrown the following year. [2] Up to 10,000 eggs may be produced, and they are stored in sacs within the shell cavity. [8] While the eggs are developing, the adult barnacle does not moult.
The anti-settling effect against the barnacle has been shown in vitro: [9] When the barnacle cyprid larva encounters a surface containing medetomidine the molecule interacts with the octopamine receptor in the larva. This causes the settling larva to increase its kicking to more than 100 kicks per minute, which makes becoming sessile nearly ...
Their body plan is uniquely reduced in an extreme adaptation to their parasitic lifestyle, and makes their relationship to other barnacles unrecognisable in the adult form. The name Rhizocephala derives from the Ancient Greek roots ῥίζα ( rhiza , "root") and κεφαλή ( kephalē , "head"), describing the adult female, which mostly ...
Barnacle adults are sessile; most are suspension feeders with hard calcareous shells, but the Rhizocephala are specialized parasites of other crustaceans, with reduced bodies. Barnacles have existed since at least the mid-Carboniferous, some 325 million years ago. In folklore, barnacle geese were once held to emerge fully formed from goose ...
A meatotomy (/ m iː ə ˈ t ɒ t əm ɪ / [1] [2]) is a form of penile modification in which the underside of the glans is split, extending the urinary meatus.The procedure may be performed by a doctor to alleviate meatal stenosis or urethral stricture.
Chthamalus stellatus, common name Poli's stellate barnacle, is a species of acorn barnacle common on rocky shores in South West England, Ireland, and Southern Europe. [ 1 ] [ 2 ] It is named after Giuseppe Saverio Poli .
The ivory barnacle is a medium-sized, cone-shaped sessile barnacle with a white test composed of fused plates. It has a diamond-shaped operculum protected by a hinged lid formed from two triangular halves each consisting of two plates, a tergum and a scutum. It can grow to a height of 2.5 cm (0.98 in) but most individuals are much smaller.
Surgery Saved My Life is a documentary series which aired for two years on Discovery Channel. [1] It is a medical show that features people with life-threatening health problems. The cameras follow the patients as they undergo surgery and the doctors as they prepare for and follow through on the life-saving operations.