Could I ask for confirmation or correction of my attempted interpretation of the labelled features in the attached image. I would be especially grateful if anyone can give me access to an anatomical description with diagrams of Otina ovata (Pulmonate marine mollusc). The specimen shown is from a sea cave in N. Yorkshire, England. For the species, it is large; shell length 2.3mm.
Here are my guesses, mostly seen through the mantle, but 11 (plate similar to Patella "jaw") was dissected out:
1: anterior edge of head. 2: eye. 3: mantle edge. 4: mantle skirt. 5: Long intestine curved into horseshoe-shape to fit inside body. 6: ?digestive gland. 7: ?gonads. 8: ??kidney. 9: radula between blackish muscles. 10: ??blackish muscles for operation of radula. 11. sclerotized plate, resembling similar structure in Patella vulgata that retains loosened food as radula gathers it. 12: ??stomach. 13: sole of foot.
Thanks, Ian.
I think you should dissect the specimen to look at the inner anatomy properly. On the other hand, if you really need that kind of picture you should be satisfied with very low informations.
Otina ovata (Brown, 1927) is the current name for Otina otis (Turton, 1819), so J. E. Morton's paper "The functional morphology of Otina otis, a primitive marine pulmonate" (linked below) should answer your question. Turton (1819) named his taxon as Helix otis, which is preoccupied by Helix otis Lightfoot, 1786, so Brown's name for the taxon is used instead.
core.kmi.open.ac.uk/download/pdf/6185241.pdf
Based on article (Morton's paper) sent by Gary Rosenberg behest my opinion about the structures location.
1 - oral lappet [fig 2: or l]; 2 - eye; 3 - mantle [fig 2: pa]; 4 - mantle skirt [of pallial cavity, fig 2: p ca]; 5 - intestinal loop [intestine, fig 2: int]; 6, 7 - digestive gland [fig 2: a dg, p dg]; 8 - stomach [I added the caption of the kidney in the figure attached (kd)]; 9 - radula; 10 - lateral buccal gland [fig 5: l bg]; 11 - jaw [fig fig 5: j]; 12 - gonads [ovotestis, fig 2: gon]; 13 - sole of foot.
Many thanks Gary; Morton's paper is exactly what I was hoping for. I am familiar with the name Otina otis as Morton's other paper on its crevice habitat http://plymsea.ac.uk/view/year/1954.html#group_M was one of the first papers I read in 1968 when my interest in molluscs began. I thought I'd searched O. otis on Google scholar, but obviously not; mea culpa. Thanks again, Ian.
Oi Carlo. Gary's message arrived late last night (UK time) so I read the paper in bed. When I logged on this morning I found your message. Thank you so much for your time in relating it to my image. I was coming to similar conclusions, but I had a way to go so your contribution is a great help and your expertise gives me more confidence. Obrigado, Ian.
Thank you Rachel and Willy for your input. As the two specimens were 2mm long and my instruments and skill are basic, I could not remotely approach Morton's level of dissection. As the species may not be familiar to workers outside Britain and NW France, I'm attaching an image of a live one for (I hope) interest.
Thanks again for help given. I have uploaded a pdf of images and text at https://www.researchgate.net/publication/269167726_Otina_ovata_Identification__Biology
Data Otina ovata Identification & Biology
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