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- W3149261751 abstract "Extant neritimorphs with planktotrophic larval development have a convolute smooth larval shell which is internally resorbed. The oldest known larval shells of this type are of Triassic age. Well-preserved Late Palaeozoic neritimorph specimens have larval shells of two or more rapidly increasing well separated whorls. These larval shells resemble planktotrophic caenogastropod larval shells. This type of larval shell is possibly plesiomorphic in neriti- morphs and caenogastropods. Permian/Pennsylvanian neritimorphs ( Naticopsis, Trachyspira ) have smooth larval shells (Naticopsidae) or larval shells with strong axial ribs (Trachyspiridae new family). The convolute low-spired round shell shape of modern neritimorphs is causally linked with the resorption of the inner teleoconch and proto- conch whorls. Modern neritimorph shells with a uniform, undifferentiated inner lumen have probably evolved from naticopsid ancestors which lack resorption. It is possible that an elevated spire, deep sutures and protruding spiral larval shells would have made such internally undifferentiated shells more vulnerable for mechanical destruction and predation. Suggestions that coiling evolved independently in neritimorphs and other Gastropoda are unlikely and con- trast with the fossil record. The modern neritid larval shell has probably evolved from relatively low-spired smooth naticopsid larval shells like those reported here. Kurzfassung: Heutige Neritimorpha mit planktotropher Larvalentwicklung besitzen eine konvolute, glatte Lar- valschale, deren Windungen innen resorbiert sind. Die altesten bekannten Larvalschalen dieses Typs sind triassischen Alters. Gut erhaltene spatpalaozoische neritimorphe Gastropoden besitzen Larvalschalen mit zwei oder mehr wohl separierten, schnell zunehmenden Windungen. Diese Larvalschalen gleichen planktotrophen Larvalschalen von Ca- enogastropoden. Dieser Larvalschalentyp ist moglicherweise bei Neritimorpha und Caenogastropoda plesiomorph. Permische und oberkarbonische Neritimorphe ( Naticopsis, Trachyspira ) haben glatte Larvalschalen (Naticopsidae) oder Larvalschalen mit starken Axialrippen (Trachyspiridae, neue Familie). Die stark konvolute niedrig gewundene, runde Schalengestalt der modernen Neritimorphen entwickelte sich zusammen mit der Resorbierung der Innenwin- dung des Teleoconchs und Protoconchs bzw. Beides bedingte einander. Die moderne Neritimorphenschale mit einem einheitlichen, undifferenzierten Innenraum lasst sich von einem naticopsiden Vorfahren herleiten, der noch nicht re- sorbiert war. Eine herausgehobene Spira, tiefe Suturen sowie eine gewundene herausragende Larvalschale hatten eine intern resorbierte Schale vermutlich anfallig fur mechanische Verletzung und Angriffe von Raubern gemacht. Die Annahme, die Aufwindung habe sich bei Neritimorphen unabhangig von anderen Schnecken entwickelt ist unwahr- scheinlich und steht im Widerspruch zum Fossilbericht. Die Larvalschale der modernen Neritiden entwickelte sich vermutlich aus einer glatten, niedrig gewundenen Larvalschale, wie sie hier bei karbonischen Naticopsiden dokumen- tiert wird. Schlusselworter: GastropodaNeritimorphaPhylogenieLarvalschalenProtoconcheSpates Palaozoikum" @default.
- W3149261751 created "2021-04-13" @default.
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- W3149261751 date "2007-01-01" @default.
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- W3149261751 title "Larval shells of Late Palaeozoic naticopsid gastropods (Neritopsoidea: Neritimorpha) with a discussion of the early neritimorph evolution" @default.
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