The shell morphology and the apertural characters are relevant only in a few cases.
ELIO ROBBA, LUCA PEDRIALI, ERMANNO QUAGGIOTTO 2016, 'EOCENE, OLIGOCENE AND MIOCENE NATICID GASTROPODS OF NORTHERN ITALY', Rivista Italiana di Paleontologia e Stratigrafiahttps://riviste.unimi.it/index.php/RIPS/article/view/7313. Retrieved from DOAJ CC BY 4.0 (https://creativecommons.org/licenses/by-sa/4.0/legalcode)
Most of the migrant snails presented apertural lamellae.
Frederico Simões Barbosa 1989, 'Mass migration of juvenile Biomphalaria glabrata snails bred under semi-natural conditions',Memórias do Instituto Oswaldo Cruz.http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0074-02761989000800014. Retrieved from DOAJ CC BY 4.0 (https://creativecommons.org/licenses/by-sa/4.0/legalcode)
Prominent smooth apertural muscles extend from the basal cystid wall to each lateral side of the vestibular wall.
Wanninger Andreas, Wood Timothy S, Schwaha Thomas 2011, 'Myoanatomy and serotonergic nervous system of the ctenostome Hislopia malayensis:evolutionary trends in bodyplan patterning of ectoprocta', Frontiers in Zoologyhttp://www.frontiersinzoology.com/content/8/1/11. Retrieved from DOAJ CC BY 4.0 (https://creativecommons.org/licenses/by-sa/4.0/legalcode)
Here, we observed the apertural prismatic coating for the first time as an integral part of flares and parabolae.
Gregor Radtke, René Hoffmann, Helmut Keupp 2016, 'Form and formation of flares and parabolae based on new observations of the internalshell structure in lytoceratid and perisphinctid ammonoids', Acta Palaeontologica Polonicahttp://www.app.pan.pl/archive/published/app61/app001542015.pdf. Retrieved from DOAJ CC BY 4.0 (https://creativecommons.org/licenses/by-sa/4.0/legalcode)
Enclosed elliptical or subtriangular areas in apertural parts of the anterior lateral sinuses were found for the first time.
Aleksandr A. Mironenko 2015, 'The soft-tissue attachment scars in Late Jurassic ammonites from Central Russia',Acta Palaeontologica Polonicahttp://www.app.pan.pl/archive/published/app60/app000412013.pdf. Retrieved from DOAJ CC BY 4.0 (https://creativecommons.org/licenses/by-sa/4.0/legalcode)