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Post by bubikolramios on Apr 16, 2014 3:07:24 GMT
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Cashell
Archachatina puylaerti
Posts: 1,124
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Post by Cashell on Apr 16, 2014 16:43:24 GMT
I'm not too proficient with shell terminology, but from what I know that gibbula divaricata has a closed umbilicus while copse snails (arianta arbustorum) have a slit in their umbilicus so it can be classified as open despite what some sites may say.
EDIT: after reading over your question, your main concern is what term sounds better, so yeah I'd go with closed or open even though the word absent could work, but kind of makes it sound as if doesn't have any umbilicus at all.
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Post by bubikolramios on Apr 17, 2014 8:07:07 GMT
Making a simple mollusca key in a sence, not to have to many items on list for determination. Even if there are few specimens with 'umbilicus absent' I would not put that on list, rather call that 'umbiculus at least partly closed' = direct view from bottom - something prevent to see complete hole or hole not there at all. "a slit" - would that mean part of inner lip ? see & try (test data): agrozoo.net/jsp/Galery_upload_1.jsp?p1=search&l2=enCheck 6. row of controls where "mollusca" stands. Putting green checkmark ass opposed to clicking again and putting red checkmark is positive/negative selection.Hit enter. Any suggestion welcome. |
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Post by brunni on Apr 21, 2014 17:06:40 GMT
UMBILICUS - Cavity surrounding the axis, opening at the base of the shell.
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