thoracic appendage，thoracic limb
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- siliceous sponges
- capsomer,capsomere
- terrestrial pollution
- cold water species
- BU (region)
- pseudomonas aeruginosa
- granulated gel
- Sphingomyelin
- Ligia exotica
- protopod larva
- tapetum
- heterogeneous nuclear rna
- flagellated chamber
- urethral gland
- conserved domain
- oral pole
- testa
- blocks world
- meiolecithal egg，microlectithal egg,oligolecthal egg
- paranasal sinus