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17 results for “Pycnodontes”
Figure 8 in A new pycnodont fish, Scalacurvichthys naishi gen. et sp. nov., from the Late Cretaceous of Israel
Figure 8. Cloacal region of Proscinetes bernardi (Thiollierè, 1852) JME 250 with the arrow pointing to the bifurcating cloacal scale present on this specimen. Scale bar = 1 cm.
Figure 6 in A new pycnodont fish, Scalacurvichthys naishi gen. et sp. nov., from the Late Cretaceous of Israel
Figure 6. Majority rule consensus tree depicting the systematic position of Scalacurvichthys naishi gen. et sp. nov. holotype (SMNK-PAL. 8613) with all unordered characters based on modified database of Poyato-Ariza & Wenz (2002). Nodes are as follows: A, Pycnodontiformes; B, Brembodontidae; C, Pycnodontoidei; D, Pycnodontidae; E, Proscinitinae; F, Pycnodontinae.
Figure 4. A in A new pycnodont fish, Scalacurvichthys naishi gen. et sp. nov., from the Late Cretaceous of Israel
Figure 4. A, imprint of caudal fin of Scalacurvichthys naishi gen. et sp. nov. holotype (SMNK-PAL. 8613). B, cast of caudal fin, mirrored; anterior to the right. C, camera lucida drawing based on cast of caudal fin; dashed lines indicate the restoration of incompletely preserved structures. Abbreviations: ep 1–4, epichordals 1–4; h 1–10, hypochordals 1–10; ph, parhypural. Scale bars = 1 cm.
Figure 5. A in A new pycnodont fish, Scalacurvichthys naishi gen. et sp. nov., from the Late Cretaceous of Israel
Figure 5. A, cloaca of Scalacurvichthys naishi gen. et sp. nov. holotype (SMNK-PAL. 8613); dashed white lines indicate the restoration of incompletely preserved structures; tip of right branch of posterior modified cloacal scale overlain by disarticulated flank scales therefore not shown. B, camera lucida drawing; probable shape of posterior modified cloacal scale is reconstructed using dashed lines. Abbreviations: amcs, anterior modified cloacal scale; cs, cloacal scale; pcb, postcoelomic bone; pmcs, posterior modified cloacal scale; vrs, ventral ridge scale. Scale bars = 1 cm.
Figure 3 in A new pycnodont fish, Scalacurvichthys naishi gen. et sp. nov., from the Late Cretaceous of Israel
Figure 3. Skull of Scalacurvichthys naishi gen. et sp. nov., holotype (SMNK-PAL. 8613) under UV light in order to show the preserved remains of the posterior exposed endocranium to which the arrow points. Scale bar = 1cm.
Figure 2. A in A new pycnodont fish, Scalacurvichthys naishi gen. et sp. nov., from the Late Cretaceous of Israel
Figure 2. A, skull of Scalacurvichthys naishi gen. et sp. nov., holotype (SMNK-PAL. 8613) with forward-facing first dorsal ridge scale. B, camera lucida drawing showing restored position of scale tip in life. C, camera lucida drawing of first dorsal ridge scale as it is seen in the holotype showing original position of the tip of the spine. D, restoration of first two dorsal ridge scales revealing probable morphology; dashed lines indicate the restoration of incompletely preserved structures. Abbreviations: 1st drs, 1st dorsal ridge scale; ang, angular bone; art, articular bone; cp, coronoid process; den, dentalosplenial; dhyo, dermohyomandibular; dps, dermopterosphenotic; dso, dermosupraoccipital; endo, posteriorly exposed endocranium; mes, mesethmoid; met, metapterygoid; or, orbit; pa, parietal; pap, post-parietal process; pm, premaxilla; pp, post-parietal bone; pra, prearticular bone; pre, preoperculum; ps, parasphenoid process; sc, sclerotic ring; vo, vomer. Scale bars: A–C = 1 cm; D = 50 mm.
Figure 1. A in A new pycnodont fish, Scalacurvichthys naishi gen. et sp. nov., from the Late Cretaceous of Israel
Figure 1. A, Scalacurvichthys naishi gen. et sp. nov., holotype (SMNK-PAL. 8613). B, camera lucida drawing of Scalacurvichthys naishi gen. et sp. nov.; dashed lines indicate the restoration of incompletely preserved structures; bones shaded in grey are reconstructions while the rest of the drawing is the original specimen. Scale bars = 1 cm.
Figure 7 in A new pycnodont fish, Scalacurvichthys naishi gen. et sp. nov., from the Late Cretaceous of Israel
Figure 7. Cloacal region of Stemmatodus rhombus (Heckel, 1854) MNHN JRE 41 with the arrows pointing to the bifurcated scales anterior and posterior to the cloaca. Dashed line indicates boundary between ventral ridge scale and bifurcated posterior modified cloacal scale. Scale bar = 50 mm.
Fig. 7 in The origin of the Pycnodonteinae and relationship between gryphaeas and true pycnodontes
Fig. 7. Shell microstructure of pycnodontein oyster Pycnogryphaea weberae (Yanin in Tschelzova, 1969) from Berriasian of Crimea, section Balki village, Dalmasiceras tauricum Subzone. A. Thin section K-147-1 of left and right valves TsSGM 2088/36 with locations of photomicrographs (A1); inner part of left valve with myostracum consisting of irregular simple prismatic microstructure, microstructure of valve represented by haICCF (A2); umbonal part of right valve represented by simple RF and laICCF (A3); inner part of right valve represented by simple RF, laICCF and haICCF. B. Thin section K-151- 10 of right valve with locations of photomicrographs (B1); umbonal part represented by simple RF and CICF (B2); outer part represented by hCCF and simple RF; exostracum consists of prismatic microstructure (B3). CICF, chomata-influenced crossed foliated microstructure; hCCF, homogeneous complex crossed foliated microstructure; haICCF, high angle irregular complex crossed foliated microstructure; laICCF, low angle complex crossed foliated microstructure; RF, regular foliated microstructure.
Fig. 6 in The origin of the Pycnodonteinae and relationship between gryphaeas and true pycnodontes
Fig. 6. Shell microstructure of pycnodontein oyster Pycnogryphaea weberae (Yanin in Tschelzova, 1969) from Berriasian of Crimea, section Balki village, Dalmasiceras tauricum Subzone. Thin section K-151-29 of left valve TsSGM 2088/35 with locations of photomicrographs (A); umbonal region represented by laCCF (B); internal part represented by haICCF (C); external part: endostracum consists of "furcate" microstructure, simple regular foliated microstructure (simple RF), hICCF and haICCF (D); central part represented by laICCF and haICCF (E, F). haICCF, high angle irregular complex crossed foliated microstructure; laICCF, low angle complex crossed foliated microstructure; simple RF, simple regular foliated microstructure.
Fig. 3 in The origin of the Pycnodonteinae and relationship between gryphaeas and true pycnodontes
Fig. 3. Subdivision of the Berriasian stage from Crimean Mountains correlated along with Mediterranean basin, and associated distribution of the species Pycnogryphaea weberae from the different localities. 1, Chernokamenka village; 2, Sarysu river; 3, Balki village; 4, Mezhgorye village; 5, Solnechnoselye village; 6, Kuchki village; Vln, Valanginian. Stratigraphy after Arkadiev et al. 2017a, b.
Fig. 2 in The origin of the Pycnodonteinae and relationship between gryphaeas and true pycnodontes
Fig. 2. Geographical position of the studied oysters locations. 1, Chernokamenka village; 2, Sarysu river; 3, Balki village; 4, Mezhgorye village; 5, Solnechnoselye village; 6, Kuchki village.
Fig. 1 in The origin of the Pycnodonteinae and relationship between gryphaeas and true pycnodontes
Fig. 1. Schematic drawing illustrating shell morphology of Pycnogryphaea weberae Yanin in Tschelzova, 1969. Left valve in inner (A) and outer (B) views; right valve in inner (C) and outer (D) views. The image is given approximately in natural size.
Fig. 5 in The origin of the Pycnodonteinae and relationship between gryphaeas and true pycnodontes
Fig. 5. Variability of pycnodontein oyster Pycnogryphaea weberae (Yanin in Tschelzova, 1969) from Berriasian of Crimea, section Balki village, Dalmasiceras tauricum Subzone. A. Length vs. height, N = 27. B. Length/ height frequency, N = 27. C. Convexity/length frequency, N = 27. Conv, convexity of shell; Conv/L, convexity coefficient; H, shell height; L, shell length; L/H, elongation coefficient.
Fig. 3 in New insight into the distribution and palaeobiology of the pycnodont fish Gyrodus
Fig. 3. Late Jurassic pycnodonts to exemplify the body form and arrangement of unpaired fins. A. Gyrodus hexagonus (de Blainville, 1818) (JME SOS 3163) from the Tithonian of Eichstätt, southern Germany. B. Apomesodon gibbosus (Wagner, 1851) (JME SOS 3572a) from the Tithonian of Eichstätt, southern Germany. Scale bars 5 cm.
Fig. 2 in New insight into the distribution and palaeobiology of the pycnodont fish Gyrodus
Fig. 2. Dental remains of Gyrodus spp. A. Right prearticular dentition of Gyrodus sp. (NLH 102.971) from the lower Barremian of clay pit "Gott"; occlusal (A1), mesial (A2), and lateral (A3) views. B. Fragmentary prearticular dentition of Gyrodus sp. (NLH 102.972) from the Hauterivian of clay pit "Engelbostel"; occlusal view. C. Articulated prearticulars of Gyrodus hexagonus (de Blainville, 1818) (MB.f. 1345) from the Kimmeridgian of Solnhofen, Bavaria; occlusal view. D. Posterior principle prearticular teeth of Gyrodus hexagonus (de Blainville, 1818) (BSP−AS VII 1073) from the Kimmeridgian of Solnhofen, Bavaria; occlusal view. E. Latero−posterior prearticular tooth of Gyrodus hexagonus (de Blainville, 1818) (MB.f. 1367) from the Kimmeridgian of Solnhofen, Bavaria; occlusal view. F. Left prearticular of Gyrodus circularis Agassiz, 1844 (JM SOS 3130) from the Kimmeridgian of Wintershof, Bavaria; occlusal view. G. Unidentified pycnodont vomer (aff. Gyrodus? sp.) (MB.f. 7133) from the Hauterivian, Lower Cretaceous, of Langenberg near Oker, northern Germany; occlusal view. H. Left prearticular of an unidentified pycnodont (aff. Gyrodus? sp.) (MB.f. 7233) from an Lower Cretaceous erratic of the Baltic Sea; occlusal view. Scale bars 5 mm.
Fig. 1 in New insight into the distribution and palaeobiology of the pycnodont fish Gyrodus
Fig. 1. General sketch map of Germany (A) with position of the clay pits "Gott" and "Engelbostel" (B) that yielded the dental remains described herein. Abbreviations: E, clay pit "Engelbostel"; G, clay pit "Gott"; H, Hanover.
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