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螯肢亞門

Chelicerata

Body symmetry

Namigai et al 2014
雙側對稱
URI：http://purl.obolibrary.org/obo/PATO_0001324

定義： being symmetric about a plane running from frontal end to caudal end (head to tail), and having nearly identical right and left halves

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cellularity

Cellularity and growth form
multicellular
URI：http://purl.obolibrary.org/obo/PATO_0001993

定義： A cellularity quality inhering in a bearer by virtue of the bearers consisting of more than one cell. [ PATOC:GVG ]

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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

(最大)
Appeltans et al

38

(最小)

skeleton structure

Mineralogy
exoskeleton
URI：http://purl.obolibrary.org/obo/UBERON_0006611

定義： Exoskeleton or shell, including those of mollusks, turtles, insects and crustaceans

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total species (expert opinion)

Appeltans et al

7066

(最大)
Appeltans et al

5335

(最小)

total unknown species (statistical model)

Appeltans et al

3000

(最大)
Appeltans et al

2700

(最小)

visual system

Bitsch 2005
單眼
URI：http://purl.obolibrary.org/obo/BTO_0001758

定義： small simple eyes, found in many invertebrates, usually consisting of a few sensory cells and a single lens

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