Leeches

Hirudinea

Body symmetry

• Namigai et al 2014: bilaterally symmetric

body shape

• Pettibone 1982: vermiform

cellularity

• Cellularity and growth form: multicellular

described accepted species

• Appeltans et al: 179

habitat

• World Register of Marine Species: marine benthic

latitude

• OBIS environmental data records: -79.15 degrees (min)
• OBIS environmental data records: 77.433 degrees (max)

locomotion

• Kristan 2019: inchworming
• Kristan 2019: peristalsis

longitude

• OBIS environmental data records: 178.284 degrees (max)
• OBIS environmental data records: -179.652 degrees (min)

percent of marine species currently described

• Appeltans et al: 54 (min)
• Appeltans et al: 72 (max)

percent synonyms among marine species

• Appeltans et al: 28

total unknown marine species

• Appeltans et al: 70 (min)
• Appeltans et al: 155 (max)

undescribed marine species present in museum collections

• Appeltans et al: 15 (min)
• Appeltans et al: 35 (max)

undiscovered marine morphospecies

• Appeltans et al: 100 (max)
• Appeltans et al: 50 (min)

undiscovered species (molecular cryptic)

• Appeltans et al: 41414

water depth

• OBIS environmental data records: 4400 m (max)

water dissolved o2 concentration

• OBIS environmental data records: 1.108 mL/L (min)
• OBIS environmental data records: 8.091 mL/L (max)

water nitrate concentration

• OBIS environmental data records: 0.057 µmol/l (min)
• OBIS environmental data records: 41.739 µmol/l (max)

water o2 saturation

• OBIS environmental data records: 15.751 percent (min)
• OBIS environmental data records: 102.795 percent (max)

water phosphate concentration

• OBIS environmental data records: 0.085 µmol/l (min)
• OBIS environmental data records: 3.116 µmol/l (max)

water salinity

• OBIS environmental data records: 38.144 psu (max)
• OBIS environmental data records: 6.559 psu (min)

water silicate concentration

• OBIS environmental data records: 0.756 µmol/l (min)
• OBIS environmental data records: 169.201 µmol/l (max)

water temperature

• OBIS environmental data records: -1.947 degrees celsius (min)
• OBIS environmental data records: 26.869 degrees celsius (max)