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Siphonaria thersites	Pulmonate snails
	With ‘lungs’ and gills

BK Intertidal univalves of BC says thersites is only known Siphonaria along this coast.

Further says hermaphrodite and has no larval stage. Latter consistent with field observations where very limited distributions (NW to N sides of island in upper intertidal) plus usually with juveniles during summer months

	Has Lung
	Greening (G) (from grazing(?))and siphon (?) at v on image left; and 1 above. There is something coming from under the shell at the 2 also; the head (H) has no tentacles which signals not a ‘true’ limpet.

Some video footage from AUG
	May video shows well the under parts link

Created by LG on 4/6/2004

Last updated on Sunday, September 12, 2004