- opercular valve
- Movable plate in orifice of cirriped shell, one of pairs of scuta and terga joined to sheath by opercular membrane. [Moore and McCormick, 1969] [Martin, 2005].One of 2 or 4 movable plates occluding aperture in sessile barnacles [McLaughlin, 1980].(Subclass Cirripedia):Barnacle shell feature: in unstalked barnacle, calcareous plate forming part of closing apparatus (operculum). Consists of symmetrical forms of both scuta and terga, in asymmetrical forms of single (movable) scutum and single (movable) tergum. Attached to inner wall (sheath) of shell by opercular membrane [Stachowitsch, 1992].
Crustacea glossary. Natural History Museum of Los Angeles County. 2011.
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valve — Lateral part of divided carapace commonly joined to opposite part by hingement along dorsal mid line (e.g., Ostracoda, Conchostraca, Leptostraca) [Moore and McCormick, 1969]. Lateral part of divided carapace, commonly joined to opposite part by… … Crustacea glossary
fish — fishless, adj. /fish/, n., pl. (esp. collectively) fish, (esp. referring to two or more kinds or species) fishes, v. n. 1. any of various cold blooded, aquatic vertebrates, having gills, commonly fins, and typically an elongated body covered with … Universalium
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tergum — Arched dorsal part of abdominal somites [Poore, 2004]. Arched dorsal part of each of the anterior five abdominal somites (Fig. 1). (Pl. terga) [Perez Farfante and Kensley, 1997]. Dorsal part of exoskeleton comprising tergites of all body somites… … Crustacea glossary
scutum — Paired plate or valve of thoracic Cirripedia; in lepadomorphs, 1 on each side of occludent margin of capitulum. In verrucomorphs, of two types: fixed scutum, 1 of 4 compartmental plates; movable scutum, 1 of 2 opercular plates [McLaughlin, 1980] … Crustacea glossary
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scutum — n.; pl. scuta [L. scutum, shield] 1. Any long, horny or chitinous plate. 2. (ARTHROPODA: Chelicerata) In Acari, the large, anteriodorsal sclerite. 3. (ARTHROPODA: Crustacea) In thoracic barnacles, a paired plate or valve. a. In Lepadomorpha, one… … Dictionary of invertebrate zoology
reproductive system, animal — Introduction any of the organ systems by which animals reproduce. The role of reproduction is to provide for the continued existence of a species; it is the process by which living organisms duplicate themselves. Animals compete with… … Universalium