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10 results for “Saurichthyidae”
Fig. 5 in Revision of Saurorhynchus (Actinopterygii: Saurichthyidae) from the Early Jurassic of England and Germany
Fig. 5. Characters distinguishing Saurorhynchus acutus (Agassiz, 1844) and S. hauffi sp. nov. A. S. acutus, narial region (SMNS 56923). B. S. acutus, lateral extrascapular-dermopterotic contact (SMNS 57039). C. S. hauffi sp. nov., narial region (SMNS 51888). D. S. hauffi sp. nov., lateral extrascapular-dermopterotic contact (SMNS 53980, mirrored). Abbreviations: dpt = dermopterotic; dh = dermohyal; f = frontal; l.ex = lateral extrascapular; m = maxilla; na-ao = nasaloantorbital; orb = orbit; pm = rostropremaxilla; pop = preopercle; pop* = damaged preopercle; ps = parasphenoid; so = supraorbital. Scale bars: A, C–D = 2 mm; B = 5 mm.
Fig. 1 in Revision of Saurorhynchus (Actinopterygii: Saurichthyidae) from the Early Jurassic of England and Germany
Fig. 1. Holotype specimens of Early Jurassic saurichthyids. A. Saurorhynchus acutus (Agassiz, 1844) (NHMUK PV P 4268). B. Saurorhynchus brevirostris (Woodward, 1895) (NHMUK PV OR 40726). C. Saurorhynchus anningae sp. nov. (NHMUK PV P 3791). D–E. Saurorhynchus hauffi sp. nov. (SMNS 55057). Scale bars: A, C = 20 mm; E = 50 mm. Photos A–C © The Trustees of the Natural History Museum, London.
Fig. 2 in Revision of Saurorhynchus (Actinopterygii: Saurichthyidae) from the Early Jurassic of England and Germany
Fig. 2. Reconstruction of the dermal skull in Early Jurassic saurichthyids. A. Saurorhynchus brevirostris (Woodward, 1895). B. Saurorhynchus anningae sp. nov. C. Saurorhynchus hauffi sp. nov. D. Saurorhynchus acutus (Agassiz, 1844). Not to scale. Dashed lines indicate sensory canals, grey lines indicate bones that were present but where the exact location of the sutural contact is unclear, and question marks indicate areas of uncertainty. Abbreviations: ang = angular; bs = basisphenoid; cl = cleithrum; d = dentary; dh = dermohyal; dpt = dermopterotic; dsp = dermophenotic; f = frontal; io = infraorbital; io.c = infraorbital sensory canal; l = lacrimal; l.ex = lateral extrascapular; m = maxilla; md.c = mandibular sensory canal; mio.c = medial branch of the infraorbital sensory canal; n = neomorph; na-ao = nasaloantorbital; op = opercle; p = parietal; pm = rostropremaxilla; pop = preopercle; ps = parasphenoid; sa = supraangular; scl = supracleithrum; so = supraorbital; so.c = supraorbital sensory canal.
Fig. 6. Posteriormost laniary dentition. A in Revision of Saurorhynchus (Actinopterygii: Saurichthyidae) from the Early Jurassic of England and Germany
Fig. 6. Posteriormost laniary dentition. A. Saurorhynchus brevirostris (Woodward, 1895) (NHMUK PV P 4878), note the lingually curved crowns. B. Saurorhynchus anningae sp. nov. (NHMUK PV P 27569), note the incisivlücke associated with the premaxillary laniary tooth and the absence of lateral crypts associated with the two flanking mandibular laniaries. Photos © The Trustees of the Natural History Museum, London. C. S. hauffi sp. nov. (SMNS 51007), mid-rostral dentition illustrating the relationship between the incisivlücken, laniaries, and flanking smaller teeth. Scale bars: 1 mm
Fig. 4 in Revision of Saurorhynchus (Actinopterygii: Saurichthyidae) from the Early Jurassic of England and Germany
Fig. 4. Orbitotemporal region, illustrating variation in the braincase of Early Jurassic saurichthyids. A. Saurorhynchus anningae sp. nov. (based on NHMUK PV P 36227). B, E. Saurorhynchus brevirostris (Woodward, 1895) (photo pertains to NHMUK PV P 4878, mirrored). C, F. Saurorhynchus hauffi sp. nov. (photo is of SMNS 51888, mirrored). D. Saurorhynchus acutus (Agassiz, 1844) (based on SMNS 87737). Abbreviations: asc = ascending process of the parasphenoid; bs = basisphenoid; dpt = dermopterotic; dsp = dermosphenotic; f.ic+ep = foramen for the internal carotid artery and efferent pseudobranchial artery; f.oma = f.om = foramen for the great ophthalmic artery; my = posterior myodome; n = neomorph; nc = neurocranium; orb = orbit; psr = parasphenoid rostrum; rot = foramen for the lateral otic ramus; spi = ventral opening of the spiracular canal; tf.c = trigeminofacial chamber. Scale bars: E–F = 2 mm. E. Photo © The Trustees of the Natural History Museum, London.
Fig. 3. Dorsal skull roof. A in Revision of Saurorhynchus (Actinopterygii: Saurichthyidae) from the Early Jurassic of England and Germany
Fig. 3. Dorsal skull roof. A. Saurorhynchus anningae sp. nov. (NHMUK PV P 964); note that this skull has been dorsoventrally compressed. B. Saurorhynchus hauffi sp. nov., three-dimensionally preserved skull GG 20001. Fine dashed lines indicate sensory canals, large dashes indicate broken or incomplete areas; grey lines indicate bones that were present but where the exact location of the sutural contact is unclear, and question marks indicate areas of uncertainty. Abbreviations: dpt = dermopterotic; dsp = dermophenotic; f = frontal; io = infraorbital; io.c = infraorbital sensory canal; l.ex = lateral extrascapular; mio.c = medial branch of the infraorbital sensory canal; n = neomorph; na-ao = nasaloantorbital; p = parietal; pm = rostropremaxilla; so.c = supraorbital sensory canal. Scale bars = 10 mm. A. Photo © The Trustees of the Natural History Museum, London.
Appendix 1 in Revision of Saurorhynchus (Actinopterygii: Saurichthyidae) from the Early Jurassic of England and Germany
Appendix 1. Select cranial measurements for Early Jurassic species of Saurorhynchus Reis, 1892.
Data from: Re-evaluation of the ontogeny and reproductive biology of the Triassic fish Saurichthys (Actinopterygii, Saurichthyidae)
Viviparity has evolved independently at least 12 times in ray-finned fishes. However, the fossil record of actinopterygian viviparity is poor, with only two documented occurrences. Both of these are from the non-teleost actinopterygian Saurichthys, and include S. curionii and S. macrocephalus from the Middle Triassic Meride Limestone (Monte San Giorgio, Switzerland). Here, we present new data on the reproductive biology of these species, giving unprecedented insights into their life-history. Based on positional and preservational criteria, six specimens were identified as unambiguously gravid. Embryos were positioned dorsal to the gastrointestinal tract, parallel to the axial skeleton and to each other, in the posterior two-thirds of the abdominal region. A minimum of 16 embryos are preserved in the most fecund females and, based on the largest preserved embryos and smallest preserved neonates, birth must have occurred at 7–12% of maternal fork length. Embryonic crania and teeth are relatively well-ossified, however ossification of the parietal region is delayed. In the postcranium, the median scale rows and lepidotrichia are ossified, but not the lateral scale rows. Ossified squamation and gradual allometric growth suggests that neonates did not undergo metamorphosis and were relatively precocial. When considered in a phylogenetic context, neither live birth nor internal fertilization appears to represent the primitive state for saurichthyid fishes.
Data from: Re-evaluation of the ontogeny and reproductive biology of the Triassic fish Saurichthys (Actinopterygii, Saurichthyidae)
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Fig. 7. Postcranium, Early Jurassic saurichthyids. A in Revision of Saurorhynchus (Actinopterygii: Saurichthyidae) from the Early Jurassic of England and Germany
Fig. 7. Postcranium, Early Jurassic saurichthyids. A. Saurorhynchus anningae sp. nov., neural arches and squamation in the posterior abdominal region (NHMUK PV P 3790). B–D. Saurorhynchus hauffi sp. nov., SMNS 55057. B. Lepidotrichia of the anal fin. C. Relationship between the neural and haemal arches and the axonosts. D. Caudal peduncle. Abbreviations: af.ax = axonosts of the anal fin; ax.p = axonost plate; bf = basal fulcra; cf.r = caudal fin radials; df.ax = axonosts of the dorsal fin; ff = fringing fulcra; hs = haemal spine; lep = lepidotrichia; mds = mid-dorsal scale row; mvs = mid-ventral scale row; na = neural arch; ns = neural spine. Scale bars: A = 1 mm, B–D = 5 mm. A. Photo © The Trustees of the Natural History Museum, London.
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