蛭 - leech

mangrove (of family Rhizophoraceae)

black mangrove (Bruguiera gymnorrhiza)

Rhizophora mucronata (species of mangrove)

grey mangrove (Avicennia marina); white mangrove

vermiculite

Hirudo nipponia (species of blood-sucking leech)

Hirudo nipponia (species of blood-sucking leech)

sheep liver fluke (Fasciola hepatica)

Whitmania pigra (species of leech)

land leech (Haemadipsa zeylanica japonica)

Helobdella stagnalis (species of leech)

Potamogeton distinctus (species of pondweed)