Photo of S4 (dorsal)
dorsal

Photo of S4 (ventral)
ventral

Photo of S4 (side)
side

Drawing of S4 (dorsal)
dorsal

Drawing of S4 (ventral)
ventral

Drawing of S4 (side)
side

Notes:

  • was also called W1

Measurements:

  • Length: 467 μm
  • Width: 185 μm
  • Depth: 97 μm

Glossary: