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