Chelicerates

Chelicerata

Body symmetry

• Namigai et al 2014: bilaterally symmetric

cellularity

• Cellularity and growth form: multicellular

known marine species

• Appeltans et al: 2685

number of new species decribed 1999-2008

• Appeltans et al: 340

percent of marine species currently described

• Appeltans et al: 50 (max)
• Appeltans et al: 38 (min)

skeleton structure

• Mineralogy: exoskeleton

total species (expert opinion)

• Appeltans et al: 7066 (max)
• Appeltans et al: 5335 (min)

total unknown species (statistical model)

• Appeltans et al: 3000 (max)
• Appeltans et al: 2700 (min)

visual system

• Bitsch 2005: ocelli