Class Thecostraca

• Commonly known as "barnacles"
• 8 pairs of thoracic feeding appendage or cirri
• Larval stage: motile
• Adult stage: sessile with a calcareous encasement that can be either stalked or unstalked
• They live in burrows with calcareous substrates or as parasites within the bodies of other animals
• Phylum: Arthropoda

  Subphylum: Mandibulata

  Superclass: Crustacea

  Class: Thecostraca

  Order: Balanomorpha

  Family: Balanidae

  Genus: Balanus

  Common name: Common barnacle

  A) Carina

  B) Cirri

  C) Rostrum

  D) Tergum

  E) Scutum

  
• Balanus diagram

  A) Carina

  B) Carinolateral

  C) Tergum

  D) Scutum

  E) Lateral plate

  F) Rostrum

  G) Basal plate

  H) Operculum

  
• Life cycle of barnacle

  A) Nauplii

  B) Egg

  C) Barnacle

  D) Cyprid

  E) Settling

  
• Phylum: Arthropoda

  Subphylum: Mandibulata

  Superclass: Crustacea

  Class: Thecostraca

  Order: Lepadomorpha

  Family: Lepadidae

  Genus: Lepas

  Common name: Stalked Gooseneck Barnacle

  A) Cirri

  B) Aperture

  C) Tergum

  D) Mantle

  E) capitulum

  F) Scutum

  G) Carina

  H) Peduncle