后口亚目：后口总目(superorder Apostomatidea)后口目(order Apo-stomatida)中的纤毛原虫亚目，宿主主要为海洋甲壳动物，也有几种寄生于多毛纲(polychaeta)或淡水甲壳动物，特征为在未成熟和成熟期都有胞质体存在，且具玫瑰花纹- p
- p.150,95
- P.A.
- Pa
- PA
- Paas' disease
- Pabanol
- PAB, PABA
- pabulin
- pabulum
- pacchionian depressions, foramen,granulations(bodies,glands)
- pacemaker
- pachy-
- pachyblepharon
- pachyblepharosis
- pachycephalia
- pachycephalic
- pachycephalous
- pachycephaly
- pachycheilia
- pachychromatic
- pachydactylia
- pachydactyly
- pachyderma
- pachydermatocele