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9 results for “Leinzia”
Fig. 7 in Morphology and taxonomic position of the bizarre Permian pachydomid bivalve Leinzia from Western Gondwana
Fig. 7. Pachydomid bivalves from the Guadalupian (Permian), Teresina and Serra Alta formations, respectively, Paraná Basin, Brazil. A. Holdhausiella elongata (Holdhaus, 1918), DZP-20441, silicified shell, left valve, note the pointed anterior margin of the shell. B. Anhembia gigantea (Mendes, 1949), DGP/7-91, composite mold, left valve; B1, detail of a well-developed rostrum, B2, general view. Scale bars 5 mm.
Fig. 6 in Morphology and taxonomic position of the bizarre Permian pachydomid bivalve Leinzia from Western Gondwana
Fig. 6. Drawing of the pachydomid bivalve Leinzia similis (Holdhaus, 1918) (sensu stricto) showing the general morphology. The hinge area and anterior muscles scars are highlighted. Abbreviations: aa, anterior adductor muscle scar; app, anterior pedal protractor muscle scar; apr, anterior pedal retractor muscle scar; sck, socket; th, tooth.
Fig. 8 in Morphology and taxonomic position of the bizarre Permian pachydomid bivalve Leinzia from Western Gondwana
Fig. 8. Ontogenetic series of the pachydomid bivalve Leinzia sp. (sensu lato) from the Serrinha Member, Rio do Rasto Formation after Runnegar and Newell (1971: fig. 24). Sketches based on external comarginal ornamentation (rugae and growth lines) of individual shells. A, B, based on Runnegar and Newell 1971: fig. 24j, f, respectively. Note the differences in the shell shape of both specimens and those illustrated in Fig. 9; also, note the ubiquitous rostrum in the specimen in Fig. 9B.
Fig. 5 in Morphology and taxonomic position of the bizarre Permian pachydomid bivalve Leinzia from Western Gondwana
Fig. 5. Pachydomid bivalve Leinzia similis (Holdhaus, 1918) (sensu stricto), Rio do Rasto Formation, Guadalupian (Permian), Paraná Basin, Brazil. A. DGP/7-88, right valve, detail of the cardinal margin showing a strongly deformed rostrum (arrowed). B. DGP/7-85, external mold, left valve; B1, the comarginal rugae on the anterior rostrum (arrow); B2, general view of the shell with well-preserved anterior rostrum. Scale bars A, B1, 1 mm; B2, 5 mm.
Fig. 9 in Morphology and taxonomic position of the bizarre Permian pachydomid bivalve Leinzia from Western Gondwana
Fig. 9. Ontogenetic series of pachydomid bivalves Leinzia similis (sensu lato) (A) from the Yaguari Formation (after Morton and Herbst 1990) and Leinzia similis (sensu stricto) DGP/7-85 (B) from the Serrinha Member, Rio do Rasto Formation. Sketches based on external comarginal ornamentation (rugae and growth lines) of individual shells. Note the differences in the shell shape of both specimens: double posterior carina (A), the anterior rostrum developed since the early ontogenetic stages (B).
Fig. 3 in Morphology and taxonomic position of the bizarre Permian pachydomid bivalve Leinzia from Western Gondwana
Fig. 3. Pachydomid bivalve Leinzia similis (Holdhaus, 1918) (sensu stricto), composite molds, Rio do Rasto Formation, Guadalupian (Permian), Paraná Basin, Brazil. A. DGP/7-88, left valve (A1) with well-defined, forwardly inclined, triangular socket (arrowed); right valve (A2), note the deformed anterior rostrum margin of the shell (arrowed); splayed open valves (A3). B. DZP-20417, right valve, note the well-developed triangular blunt tooth (arrowed). C. DZP-20416A, right valve showing well-defined escutcheon (arrowed). D. DGP/7-86, a slightly deformed specimen with articulated valves and broken anterior margin, note the straight slightly curved posterior margin of the shells. Scale bars 5 mm.
Fig. 1 in Morphology and taxonomic position of the bizarre Permian pachydomid bivalve Leinzia from Western Gondwana
Fig. 1. Chart showing the main bivalve assemblages and constituent species recorded in the Permian Passa Dois Group, except the Irati Formation (A), and location of Paraná Basin, Brazil (B). Species composition (not to scale): 1, Kidodia cf. K. stockleyi; 2, Barbosaia angulata; 3, Holdhausiella elongata; 4, Tambaquyra camargoi; 5, Rioclaroa lefevrei; 6, Maackia contorta; 7, Ferrazia simplicicarinata; 8, Anhembia gigantea; 9, Anhembia froesi; 10, Pinzonella illusa; 11, Ferrazia cardinalis; 12, Casterella gratiosa; 13, Angatubia cowperesioides; 14, Othonella araguaiana, 15, Plesiocyprinella carinata; 16, Terraia aequilateralis; 17, Runnegariella fragilis; 18, Favalia arcuata; 19, Roxoa corumbataiensis; 20, Coxesia mezzalirai; 21, Cowperesia anceps; 22, Pinzonella neotropica; 23, Naiadopsis lamellosus; 24, Jaquesia brasiliensis; 25, Terraia curvata, 26, Beurlenella elongatella; 27, Cowperesia emerita; 28, "Leinzia" curta; 29, Terraia bipleura; 30, Astartellopsis prosoclina; 31, Oliveiraia pristina; 32, Terraia altissima; 33, Leinzia similis (sensu stricto); 34, Terraia decarinata; 35, Palaeomutela platinensis; 36, Relogiincola delicata; 37, Palaeomutela australis. Data from Mendes (1952), Runnegar and Newell (1971), Simões et al. (1998), Matos et al. (2017), and Guerrini et al. (2019).
Fig. 4 in Morphology and taxonomic position of the bizarre Permian pachydomid bivalve Leinzia from Western Gondwana
Fig. 4. Pachydomid bivalve Leinzia similis (Holdhaus, 1918) (sensu stricto), Rio do Rasto Formation, Guadalupian (Permian), Paraná Basin, Brazil. A. DGP/7-88, composite mold, left valve; A1, detail of the well-defined triangular socket (arrowed); A2, latex cast of specimen in A1, showing the hinge with well-defined triangular socket (arrowed); also note the absence of true lateral teeth; A3, details of the anterior adductor, pedal protractor, and pedal retractor muscle scars (arrows); A4, anterior muscle scars (outlined). B. DZP-20417, composite mold, right valve; B1, well-developed triangular, subcardinal, blunt tooth (arrowed); B2, latex cast showing the triangular socket (arrowed) and the hinge without true lateral teeth. Scale bars 1 mm.
Fig. 2. A in Morphology and taxonomic position of the bizarre Permian pachydomid bivalve Leinzia from Western Gondwana
Fig. 2. A. Location of the studied area in the southern part of the Paraná State, south Brazil. The outcrop belt of the Passa Dois Group is in grey. B. Map of the Paraná State, Brazil (frame indicates the southern part where studied area is located) (modified from Rohn and Rösler 2000; Guerrini et al. 2019). C. Geological map showing the main geographic area of occurrence of Leinzia similis (sensu stricto). Cartographic base: Mineropar 2006 (Mapa geológico do Estado do Paraná, 1:250 000). D. Columnar section of the Rio do Rasto Formation; note the constrained stratigraphic distribution of Leinzia similis (sensu stricto) in the Serrinha Member. Abbreviations: C, calcareous mudstone; CS, coarse sandstone; G, gravel; FS, fine sandstone; MS, medium sandstone; S, siltstone.
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