anchialine
adjective
an·chia·line ˈaŋ-kē-ə-ˌlīn 
-lən
: having an underground connection to a larger tidal body (such as the sea) but no surface connection
anchialine pools
Located on an island in The Abacos, the fauna in this seawater-flooded anchialine cave is among the richest and most diverse in the world. 
Seed, June/July 2006
Seed, June/July 2006
Word History
Etymology
Greek anchíalos "near the sea, sea-girt" (from anchí "near" + -alos, derivative of háls "sea") + -ine entry 1
First Known Use
1984, in the meaning defined above