The operculum, meaning little lid, (plural: opercula or operculums) is a
corneous or calcareous anatomical structure which exists in many
Kaynak: Operculum (gastropod)The mineral is rather sectile, and consequently was earlier known as
corneous lead. Name and occurrence: File:Phosgenite-RoyalOntarioMuseum-
Kaynak: PhosgeniteThe head and dorsal surface of the prothorax are
corneous and pale brown in colour, while the rest of the body is ochreous. Pupation takes
Kaynak: Asterivora combinatanalong snout , two eyestalk s with well-developed eyes, additional sensory tentacles , a strong foot and a
corneous , sickle -shaped operculum .
Kaynak: Lobatus gigasDigestive system: There are two
corneous plates or jaws . at the sides of the buccal mass. It is slightly prolonged behind for the reception
Kaynak: Fiona pinnataScutalus mariopenai is characterized by the broadly expanded and callous lip, the fine, punctuate granulation, and the whitish-
corneousKaynak: Scutalus mariopenaiIt has three large
corneous crushing plates and ancillary
corneous spines, instead of just grinding plates. The crawling snails show
Kaynak: Bulla (gastropod)The operculum is
corneous, of variable thickness, with the nucleus near the anterior end or at about midlength of the outer margin.
Kaynak: Muricidaeincluding the material (calcareous in the Naticinae,
corneous in the Polinicinae and Sininae) and size, and also the morphology of the shell
Kaynak: NaticidaeThe conoidal spire has an acute,
corneous apex . The sutures are impressed. There are about six convex whorls , the last one rounded at
Kaynak: Monilea calliferaThe shell is moderately in size for the genus, without hairs and brownish
corneous. The spire is somewhat impressed. The shell is
Kaynak: Chloritis planorbinaThe shell is pale
corneous in color, sometimes fulvous. The spire is conoid. The apex is rather acute. The suture is simple.
Kaynak: Bulimulus tenuissimusThe shell is perforate, depressed, transversely dilated, slightly striate, very shining, and
corneous or rufous in colour. The spire is
Kaynak: Daudebardia rufaDescription: The operculum is
corneous . Species: Species within the genus Notopala include: † Notopala albascopularis (Etheridge, 1902) -
Kaynak: NotopalaThe
corneous operculum is paucispiral, and has an eccentric nucleus. The body of the animal differs from species in the family Trochidae
Kaynak: TornidaeThe aperture is closed off by a thin,
corneous, cerithioid operculum that is multispiral and almost circular. The outer lip is thin.
Kaynak: Argyropeza