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Measurement data for septal spacing and conch morphology in Cretaceous ammonoids
<p>We analyzed the ontogenetic trajectories of conch morphology and septal spacing between successive chambers in Cretaceous ammonoids (suborders Perisphinctina and Ancyloceratina) collected from southern India, Madagascar, and Japan. All examined species, except for the family Collignoniceratidae, exhibited similar characteristics during early ontogeny. The common ontogenetic trajectories of septal spacing show a cycle comprising an increase and a subsequent decrease in septal spacing during early ontogeny. The conch diameters at the end of the cycle were estimated to be 1–4 mm. The conch shape (aperture height and whorl expansion rate) covariably changed at this conch diameter. Such covariable changes are commonly recognized in the suborders Perisphinctina and Ancyloceratina. The similarity in the ontogenetic trajectories of conch morphology implies a closer phylogenetic relationship between these suborders compared to Lytoceratina or Phylloceratina.</p>
Figure 2 in High-resolution stratigraphy of the Changhsingian (Late Permian) successions of NW Iran and the Transcaucasus based on lithological features, conodonts and ammonoids
Figure 2. The Permian–Triassic boundary sections in the Ali Bashi Mountains, NW Iran.
Fig. 2 in The Changhsingian (Late Permian) ammonoids from Baghuk Mountain (Central Iran)
Fig. 2. Palaeogeographic position of the Baghuk Mountain area (after Stampfli & Borel 2002).
Fig. 1 in The Changhsingian (Late Permian) ammonoids from Baghuk Mountain (Central Iran)
Fig. 1. Geographic position of Permian–Triassic boundary sections at Baghuk Mountain.
Fig. 3 in The tornoceratid ammonoids from the Roteisenstein Formation of Dillenburg (Cephalopoda, Ammonoidea)
Fig. 3. The morphological terms used in the description of the ammonoid conchs.
Fig. 1 in The tornoceratid ammonoids from the Roteisenstein Formation of Dillenburg (Cephalopoda, Ammonoidea)
Fig. 1. The geographic position of the fossil locality of Oberscheld in the Rhenish Mountains.
Fig. 3 in The early gephuroceratid ammonoids from the Roteisenstein Formation of Dillenburg (Cephalopoda, Ammonoidea)
Fig. 3. The morphological terms used in the description of the ammonoid conchs and suture lines.
Fig. 1 in The early gephuroceratid ammonoids from the Roteisenstein Formation of Dillenburg (Cephalopoda, Ammonoidea)
Fig. 1. The geographic position of the fossil localities in the Rhenish Mountains.
FIG. 5 in The late Givetian (Middle Devonian) ammonoid Epitornoceras Frech, 1902 from Argentina (southwestern Gondwana)
FIG. 5. — Morphological terms used in the description of the ammonoid conchs.
FIGURE 9. A in The intriguing shapes of the ammonoid whorl
FIGURE 9. A) Backtransform morphospace for PC1 and PC3. B) Same as A but for PC2 and PC3.
Fig. 1 in Form and formation of flares and parabolae based on new observations of the internal shell structure in lytoceratid and perisphinctid ammonoids
Fig. 1. Different expressions of flares (A) and parabolae (B).
Fig. 1 in Ammonoid biodiversity changes across the Cenomanian-Turonian boundary in the Yezo Group, Hokkaido, Japan
Fig. 1. Map of the study areas (Mikasa, Obira, and Oyubari areas in Hokkaido, Japan).
Fig. 3 in Lower and Middle Jurassic ammonoids of the Shemshak Group in Alborz, Iran and their palaeobiogeographical and biostratigraphical importance
Fig. 3. Upper part of the Shemshak Group at Sharif−Abad.
Fig. 6 in Palaeobiogeographic and evolutionary meaning of an early Late Tournaisian ammonoid fauna from the Tafilalt of Morocco
Fig. 6. Distance matrix and cluster diagram for the latest Tournaisian ammonoid−bearing regions.
Fig. 8 in Palaeobiogeographic and evolutionary meaning of an early Late Tournaisian ammonoid fauna from the Tafilalt of Morocco
Fig. 8. The conch parameters and ratios as used in the descriptions.
Fig. 2 in Low durophagous predation on Toarcian (Early Jurassic) ammonoids in the northwestern Panthalassa shelf basin
Fig. 2. Geological map of the Toyora area, southwest Japan (modified from Tanabe et al. 1982).
Fig. 1 in Devonian pearls and ammonoid-endoparasite co-evolution
Fig. 1. Terminology and measurements. For more information on the specimens see Figs. 2 and 5.
Fig. 2 in The pharciceratid ammonoids from the Roteisenstein Formation of Dillenburg (Cephalopoda, Ammonoidea)
Fig. 2. The geographic position of the fossil localities in the Rhenish Mountains.
Text-fig. 3. Conch dimensions used in the systematic descriptions (after Korn 2017). in Late Bashkirian Ammonoids From The Mospyne Formation Of The Donets Basin, Ukraine
Text-fig. 3. Conch dimensions used in the systematic descriptions (after Korn 2017).
Fig. 11 in The ammonoids from the Gattendorfia Limestone of Oberrödinghausen (Early Carboniferous; Rhenish Mountains, Germany)
Fig. 11. The morphological terms used in the description of the ammonoid conchs and suture lines.
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