Mmathis
TurtleMommy
- Joined
- Apr 28, 2011
- Messages
- 14,296
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- Location
- NW Louisiana -- zone 8b
- Hardiness Zone
- 8b
- Country
Thanks, CW. OK, this is one SPECIALIZED parasite, but sounds like it is so specialized that it only infests one certain snail! Isn't nature amazing, though?capewind said:came up with Leucochloridium paradoxum on a fast search ... dont know if relevent or not ...
Life cycle
The worm in its larval, miracidia stage, travels into the digestive system of a snail to develop into the next stage, sporocyst. The sporocyst grows into long tubes to form swollen "broodsacs" filled with tens to hundreds of cercariae. These broodsacs invade the snail's tentacles (preferring the left, when available), causing a brilliant transformation of the tentacles into a swollen, pulsating, colorful display that mimics the appearance of a caterpillar or grub. The broodsacs seem to pulsate in response to light intensity, and in total darkness do not pulse at all.[4] The infection of the tentacles of the eyes seems to inhibit the perception of light intensity. Whereas uninfected snails seek dark areas to prevent predation, infected snails have a deficit in light detection, and are more likely to become exposed to predators, such as birds. Birds are the definitive hosts where the cercariae develop into adult distomes in the digestive system of the bird. These adult forms sexually reproduce and lay eggs that are released from the host via the bird's excretory system. These droppings are then consumed by snails to complete the life cycle of this parasitic worm.