Archignatha

Distinguishing Characteristics

• lack of any dential processes
• often large in size
  
• Known Species

Toxodenta

Distinguishing Characteristics

• two dental processes on either side of oral groove; no central process
• Often posess lateral palps that are asymmetrical
  
• Known Species

Haplognatha

Distinguishing Characteristics

• Posesses a single flat dental process in medial oral groove
  
• Known Species

Acutignatha

Distinguishing Characteristics

• Bears a single sharp dental process in medial oral groove
  
• Known Species

Tridentia

Distinguishing Characteristics

• Three dential processes in oral groove.
  
• Known Species

Corrugata

Distinguishing Characteristics

• Tightly constricted and lobed oral groove.
  
• Known Species