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FIGURE 22 in The late Maastrichtian Belemnella kazimiroviensis group (Cephalopoda, Coleoidea) in the Middle Vistula valley (Poland) and the Maastricht area (the Netherlands, Belgium) - taxonomy and palaeobiological implications

FIGURE 22. Estimation of percentage of belemnites of the kazimiroviensis group remaining in the habitat, calculated from size-group distribution at Nasiłów (Poland) and the Maastricht area (the Netherlands, Belgium).

FIGURE 21 in The late Maastrichtian Belemnella kazimiroviensis group (Cephalopoda, Coleoidea) in the Middle Vistula valley (Poland) and the Maastricht area (the Netherlands, Belgium) - taxonomy and palaeobiological implications

FIGURE 21. An excellently preserved specimen of Bln. kazimiroviensis (left) retaining part of the proostracum, together with a normally preserved guard (right) in the glauconitic sandstone at Nasiłów (field photograph; specimen with proostracum could not be collected completely).

FIGURE 19 in The late Maastrichtian Belemnella kazimiroviensis group (Cephalopoda, Coleoidea) in the Middle Vistula valley (Poland) and the Maastricht area (the Netherlands, Belgium) - taxonomy and palaeobiological implications

FIGURE 19. Belemnella (Neobelemnella) skolozdrownae (Kongiel 1962). 1-4, NHMM MK 2815, Albert Canal near Vroenhoven (61F-19), uppermost Meerssen Member; 5-8, NHMM JJ 8759, ENCI-HeidelbergCement Group quarry, Maastricht, Meerssen Member, IVf-4 or IVf-5; 9-12, MWGUW ZI/69/70, and 13-16, ZI/69/86 – from the glauconitic sandstone below the "phosphatic layer" at Nasiłów; 17-20, MWGUW ZI/69/60 and 21-24, ZI/69/61 – from the "phosphatic layer" at Nasiłów quarry. All specimens are in natural size in following views: dorsal (1, 5, 9, 13, 17, 21), lateral (2, 6, 10, 14, 18, 22), longitudinally split specimen showing internal features (3, 7, 11, 15, 19, 23), and close-up of alveolar part [x2] with the course of the bottom of ventral fissure – dashed line (4, 8, 12, 16, 20, 24).

FIGURE 2. 1 in The late Maastrichtian Belemnella kazimiroviensis group (Cephalopoda, Coleoidea) in the Middle Vistula valley (Poland) and the Maastricht area (the Netherlands, Belgium) - taxonomy and palaeobiological implications

FIGURE 2. 1, location of the Middle Vistula River valley section in the Europe; 2, location in Poland together with the schematic extension of the Cretaceous and pre-Cretaceous deposits in Poland (without the Cenozoic cover); 3, position of Nasiłów along the Vistula River between the villages of Solec nad Wisłą and Kazimierz.

FIGURE 18 in The late Maastrichtian Belemnella kazimiroviensis group (Cephalopoda, Coleoidea) in the Middle Vistula valley (Poland) and the Maastricht area (the Netherlands, Belgium) - taxonomy and palaeobiological implications

FIGURE 18. Relationship of BI (Birkelund Index) vs Dp (dorso ventral diameter at the protoconch) (BI = Ls/Dp; compare with Figure 6) of guards of Bln. kazimiroviensis from the Middle Vistula valley and the Maastricht area. The growth relationship is best described by a logarithmic curve.

opencc-zeroJan 2024View details →

Linked collectors and determiners for: A new pygmy squid, Idiosepius hallami n. sp. (Cephalopoda: Idiosepiidae) from eastern Australia and elevation of the southern endemic ' notoides' clade to a new genus, Xipholeptos n. gen..

Natural history specimen data linked to collectors and determiners held within, "A new pygmy squid, Idiosepius hallami n. sp. (Cephalopoda: Idiosepiidae) from eastern Australia and elevation of the southern endemic ' notoides' clade to a new genus, Xipholeptos n. gen.". Claims or attributions were made on Bionomia by volunteer Scribes, <a href="https://bionomia.net/dataset/48a508ae-e2ef-460d-a2e8-ad76b4b5274f">https://bionomia.net/dataset/48a508ae-e2ef-460d-a2e8-ad76b4b5274f</a> using specimen data from the dataset aggregated by the Global Biodiversity Information Facility, <a href="https://gbif.org/dataset/48a508ae-e2ef-460d-a2e8-ad76b4b5274f">https://gbif.org/dataset/48a508ae-e2ef-460d-a2e8-ad76b4b5274f</a>. Formatted as a Frictionless Data package.

opencc-zeroJan 2024View details →

Linked collectors and determiners for: The early gephuroceratid ammonoids from the Roteisenstein Formation of Dillenburg (Cephalopoda, Ammonoidea).

Natural history specimen data linked to collectors and determiners held within, "The early gephuroceratid ammonoids from the Roteisenstein Formation of Dillenburg (Cephalopoda, Ammonoidea)". Claims or attributions were made on Bionomia by volunteer Scribes, <a href="https://bionomia.net/dataset/5cb7c978-e62d-4576-b32d-2469745af89a">https://bionomia.net/dataset/5cb7c978-e62d-4576-b32d-2469745af89a</a> using specimen data from the dataset aggregated by the Global Biodiversity Information Facility, <a href="https://gbif.org/dataset/5cb7c978-e62d-4576-b32d-2469745af89a">https://gbif.org/dataset/5cb7c978-e62d-4576-b32d-2469745af89a</a>. Formatted as a Frictionless Data package.

FIGURE 5 in The Mitochondrial Genome of Allonautilus (Mollusca: Cephalopoda): Base Composition, Noncoding-Region Variation, and Phylogenetic Divergence

FIGURE 5. Phylogenetic relationships among some cephalopod species (and their orders) based on mitochondrial DNA sequences. Parsimony phylogram is based on COX and ATPase genes for cephalopod species whose mitogenomes have been sequenced; Katharina tunicata was used as an outgroup (not shown). Bootstrap values are shown along branches.

FIGURE 2 in The Mitochondrial Genome of Allonautilus (Mollusca: Cephalopoda): Base Composition, Noncoding-Region Variation, and Phylogenetic Divergence

FIGURE 2. Arrangement of the mitogenome of Allonautilus scrobiculatus; the lengths of the individual genes are drawn approximately to scale. Genes encoding on the same strand as CO1 are shown (in white) on the outer portion of the circular genome and are transcribed in the clockwise direction. Genes on the other strand are transcribed in the counterclockwise direction and are indicated on the inner portion of the genome and shaded in blue; the nine largest noncoding regions (20 bp or greater) are shown in gray.

FIGURE 4 in The Mitochondrial Genome of Allonautilus (Mollusca: Cephalopoda): Base Composition, Noncoding-Region Variation, and Phylogenetic Divergence

FIGURE 4. Base composition of the major genes (excluding tRNAs) in the mitogenome of Allonautilus. Plusstrand (+) defined as the coding strand for CO1.

FIGURE 1 in The Mitochondrial Genome of Allonautilus (Mollusca: Cephalopoda): Base Composition, Noncoding-Region Variation, and Phylogenetic Divergence

FIGURE 1. Allonautilus differs from Nautilus in the size and shape of the umbilicus, type of periostracum, and texture of the hood (e.g., Saunders et al., 1987). A. Allonautilus scrobiculatus, Little Ndrova Island, Papua New Guinea, AMNH 101045. B. Nautilus macromphalus, New Caledonia, AMNH 94104.

FIGURE 3 in The Mitochondrial Genome of Allonautilus (Mollusca: Cephalopoda): Base Composition, Noncoding-Region Variation, and Phylogenetic Divergence

FIGURE 3. Architecture of the large noncoding region of extant nautilid mitogenomes. Features are shown for the strand on which CO1 is coded. Nautilus macromphalus (Boore, 2006) was characterized by a microsatellite, six copies of a 62 bp repeat (R1–R6), and a poly-T monomer; in Allonautilus, the microsatellite and first copy of the repeat were missing in one individual (indel pattern A), and an additional repeat was missing in two other individuals (indel pattern B); all individuals possessed the poly-T monomer (blue bar). The frequency of T and G nucleotides varied considerably through the noncoding region: their frequencies, in a 100 bp sliding window, are shown in the lower panel.

FIG. 17 in Les Phricodoceratidae Spath, 1938 (Mollusca, Cephalopoda): ontogenèse, évolution et paléobiogéographie

FIG. 17. — Détail de la répartition paléogéographique des Phricodoceras à l'échelle de la Téthys occidentale en fonction de leur âge. La ligne grise met en évidence les zones d'ouvertures océaniques sensu Meister & Stampfli (2000).

FIG. 15 in Les Phricodoceratidae Spath, 1938 (Mollusca, Cephalopoda): ontogenèse, évolution et paléobiogéographie

FIG. 15. — Phylogenèse des Phricodoceratidae. Caractères: 1: a0, pas de stade « taylori », a1, présence du stade « taylori » (= crois- sance des tours rapide + recouvrement très faible + 1, 2 ou 3 rangées d'épines: la rangée périsiphonale est toujours présente, c'est en outre la plus représentative) => synapomorphie des Phricodoceras; 2: b0, stade « taylori » typique (au moins un stade ontogénétique où le tubercule domine), b1, stade « taylori » atypique (renforcement et domination de la costulation à tous les stades); 3: c0, stade « taylori » long ≥ 40 mm, c1, stade « taylori » moyen (de 40 à 25 mm), c2, stade « taylori » court <25 à 10 mm; 4: d0, côte « adulte » plus ou moins ceintrée ou faiblement sigmoïde, costulation régulière, d1, côte « adulte» très sigmoïde, costulation irrégulière; 5: e0, côte « adulte » non imbriquée, e1, côte « adulte» peu imbriquée, e2, côte « adulte » très imbriquée; 6: f0, pas de stade à côtes fortes et saillantes en fin de croissance chez le microconche, f1, présence de côtes fortes et saillantes en fin de croissance chez le micro- conche; 7: g0, ombilic moyen à ouvert dans les tours internes, plus fermé dans les tours externes, g1, ombilic très ouvert tout au long de la croissance.

FIG. 16 in Les Phricodoceratidae Spath, 1938 (Mollusca, Cephalopoda): ontogenèse, évolution et paléobiogéographie

FIG. 16. — Répartition paléogéographique des Phricodoceras à l'échelle de la planète en fonction de leur âge, d'après Owen (1983) modifié.

FIG. 14 in Les Phricodoceratidae Spath, 1938 (Mollusca, Cephalopoda): ontogenèse, évolution et paléobiogéographie

FIG. 14. — Histoire évolutive des Phricodoceras au cours du Sinémurien supérieur et du Pliensbachien (approche biostratigraphique) avec une interprétation en termes péramorphiques (flèche noire) et paedomorphiques (flèche blanche).

FIG. 13 in Les Phricodoceratidae Spath, 1938 (Mollusca, Cephalopoda): ontogenèse, évolution et paléobiogéographie

FIG. 13. — Différentes hypothèses sur l'origine des Phricodoceratidae. Les illustrations et les lignes de sutures proviennent de Hauer (1854a, b), Wähner (1882-1898), Lange (1951), Wiedmann (1970), Schlegelmilch (1976), Dommergues & Meister (1990), Dommergues (2003).

FIG. 11 in Les Phricodoceratidae Spath, 1938 (Mollusca, Cephalopoda): ontogenèse, évolution et paléobiogéographie

FIG. 11. — Ontogenèse de l'ornementation (tubercules et côtes) et de l'ombilic chez Phricodoceras avec une interprétation hétérochronique. Pour l'ornementation, le cartouche est subdivisé en trois parties: l'une pour la région ombilicale (partie inférieure), la deuxième pour la partie latérale (partie moyenne) et la troisième pour la partie ventro-latérale et ventrale (partie supérieure). Les cartouches sont proportionnels entre eux et indiquent les tailles maximales.

FIG. 9 in Les Phricodoceratidae Spath, 1938 (Mollusca, Cephalopoda): ontogenèse, évolution et paléobiogéographie

FIG. 9. — Variabilité de Phricodoceras imbricatum (Bettoni, 1900), d'après Bettoni (1900). Échelle: 1 cm.

FIG. 10 in Les Phricodoceratidae Spath, 1938 (Mollusca, Cephalopoda): ontogenèse, évolution et paléobiogéographie

FIG. 10. — Variabilité de Phricodoceras cantaluppii Fantini Sestini, 1978: A, d'après Linares et al. (1979); B, d'après Cantaluppi & Brambilla (1968). Échelle: 1 cm.