Re: NANFA-- Freshwater inverts
Sat, 18 Dec 1999 03:34:23 EST

In a message dated 12/17/99 2:08:46 PM Eastern Standard Time, writes:

<< Some oddball taxa of invertebrates
(e.g., hydroids, nemerteans) are encountered infrequently >>
What types of hydroids are there? I'm assuming one of the types you speak of
is the freshwater jellyfish.I've read about one exotic species in Michigan
and I'm wondering if there are any native to this state.I've read that they
are found at unpredictable times in many places across the U.S. and they are
being found more frequently in recent years. I think that the comparitively
warmer weather we've had the last few years has played a role and my guess is
that they must stay in stay in the polyp stage of their life most of the time
and only manifest themselves in the medusa stage when conditions are
favorable to do so, like in warmer weather when food is more abundant.This
would seem to explain why they're seen so seldomly. Are there any other types
of hydroids that get to be an inch or longer?And just what are
nemerteans?I've never even heard of them before.

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