Oligochaeta

described accepted species

• Appeltans et al: 910

percent of marine species currently described

• Appeltans et al: 5 (min)
• Appeltans et al: 13 (max)

percent synonyms among marine species

• Appeltans et al: 30

total unknown marine species

• Appeltans et al: 16900 (max)
• Appeltans et al: 5900 (min)

undescribed marine species present in museum collections

• Appeltans et al: 300

undiscovered marine morphospecies

• Appeltans et al: 5000 (min)
• Appeltans et al: 15000 (max)

undiscovered species (molecular cryptic)

• Appeltans et al: 600 (min)
• Appeltans et al: 1600 (max)