Arthropods

• CHELICERATA

  Antennae absent
• TRILOBITOMORPHA

  Antennae present/ Body divided into a median lobe and two lateral lobes by two antero-posterior furrows, extinct
• CRUSTACEA

  Antennac present/ Body into divided into 3 longitudinal lobes, extant/ Antennae two pairs
• UNIRAMIA

  Antennae present/ Body into divided into 3 longitudinal lobes, extant/ Antennae one pair
• Key to the Subphyla of Arthropoda

  (CTCU)

  A) Chelicerata

  B) Trilobitomorpha

  C) Crustacea

  D) Uniramia

  
• Types of Insect Legs:

  (asfrncc)

  A) Ambulatorial

  B) Saltatorial

  C) Fossorial

  D) Raptorial

  E) Naptatorial

  F) Clinging

  G) Clasping

  
• Body regions and parts of an insect:

  (HTA, fw, mst, pt, ce, o, a, mp, fl, hw, hl, g, s, t, mt, ml)

  A) Head

  B) Thorax

  C) Abdomen

  D) Front Wing

  E) Mesothorax

  F) Prothorax

  G) Compound Eye

  H) Ocellus

  I) Antenna

  J) Mouth parts

  K) Front leg

  L) Hind wing

  M) Hind leg

  N) Genitalia

  O) Spiracles

  P) Tympanum

  Q) Metathorax

  R) Middle leg

  
• least specialized walking legs - Ambulatorial
• Running legs, when elongate and slim - Cursorial
• Legs for jumping, when the femora are greatly enlarged - Saltatorial
• Legs for digging, shortened and heavily sclerotized (hardened by connective tissue) - Fossorial
• Legs foor grasping, modified for holding prey through femur and tibia armed with spines - Raptorial
• Legs flattened for swimming, with fine line structures - Natatorial
• legs are reduced and tibia closes forceps-like against the femur for holding on to hair or feathers - Clinging
• Legs modified with suckers and large claws for holding the female during copulation - Clasping
• Legs produces sound by rubbing against wings - Stridulating
• Parts of an Insect Leg:

  A) Coxa

  B) Trochanter

  C) femur

  D) tibia

  E) tarsus

  F) tarsal claw

  
• Insect Head Anatomy:

  • Epicranium - head capsule of an insect
  • Vertex - dorsal aspect
  • Frons - anterior or frontal aspect
  • Genae - lateral aspect
  • Occiput - posterior aspect
  • Mouthparts - ventral aspect
• • Clypeus - below the frons
  • Labrum - flaplike structure below the clypeus
  • Compound eyes - located between the vertex and the genae
  • Antennae - arise between the compound eyes
  • Ocelli or simple eyes - between compound eyes arranged in a triangular manner
  • Ecdysial suture - groove found between the antennae extending posteriorly to the membranous neck (cervix)