tag:blogger.com,1999:blog-1925453458905823877.post4223219641395573218..comments2024-01-09T19:56:03.647-05:00Comments on Freshwater Gastropods of North America: Foolish Things with Helisoma duryiRob Dillonhttp://www.blogger.com/profile/09916618545870123585noreply@blogger.comBlogger4125tag:blogger.com,1999:blog-1925453458905823877.post-53220851545995561082021-02-12T11:56:05.040-05:002021-02-12T11:56:05.040-05:00I'll have to look at the juvenile shell morpho...I'll have to look at the juvenile shell morphology. I did dissect an adult some time ago, and it is definitely Helisoma.<br />Matt Hillhttps://www.blogger.com/profile/03306265408820416369noreply@blogger.comtag:blogger.com,1999:blog-1925453458905823877.post-45153056714217538752021-02-12T11:23:38.073-05:002021-02-12T11:23:38.073-05:00Matt - Sorry I'm so pokey responding to your c...Matt - Sorry I'm so pokey responding to your comment. But maybe it worked out for the best, because by now, you've probably read my January and February posts. So have you looked at the juvenile shell morphology? Is it "thread-striate?"Rob Dillonhttps://www.blogger.com/profile/09916618545870123585noreply@blogger.comtag:blogger.com,1999:blog-1925453458905823877.post-7049750478814706082020-11-15T14:12:04.440-05:002020-11-15T14:12:04.440-05:00I think u can force a snail to take this form. It ...I think u can force a snail to take this form. It is just change it from childness oligotrophic to a place avec food and wather changecascarrabiashttps://www.blogger.com/profile/08845274892961747689noreply@blogger.comtag:blogger.com,1999:blog-1925453458905823877.post-68993679323047287842020-11-10T12:42:52.616-05:002020-11-10T12:42:52.616-05:00I have generally assumed that the large planorbids...I have generally assumed that the large planorbids that inhabit my aquariums are Helisoma trivolvis. I don't remember ever specifically stocking them, but they have been a colorful compliment to my aquariums for the last 10 years or so. Sometimes on sleepless nights I wonder if they are in fact Indoplanorbis or Planorbarius, I suppose I could look into their internal anatomy and try to elucidate this. On reading Cynthia's paper on the heredity of albinism in H. trivolvis, I wondered if her specimens lacked only body pigment, or both body and shell pigment. In my population I have both. Specimens lacking both body and shell pigment are pink, with internal organs clearly visible. Specimens lacking only body pigment are red with golden-brown shells. My favorite are the specimens only lacking shell pigment. The dark body visible through the clear shell gives the shell a pale blue color. My casual observations suggest that shell pigment is likewise controlled by mendelian heredity, but an actual experiment should be carried out. I would do it, but I foolishly invited a tiny human into my house and my free time magically disappeared!Matt Hillhttps://www.blogger.com/profile/03306265408820416369noreply@blogger.com