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Warfel, Joseph G. - One of the best experts on this subject based on the ideXlab platform.
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FIGURES 106 – 115. Taracus audisioae. Fig. 106, female palpus. Fig. 107, male palpus. Figs. 108, penis. Fig. 109, glans penis. Fig. 110 in The harvestman genus Taracus Simon 1879, and the new genus Oskoron (Opiliones: Ischyropsalidoidea: Taracidae)
2018Co-Authors: Shear, William A., Warfel, Joseph G.Abstract:FIGURES 106 – 115. Taracus audisioae. Fig. 106, female palpus. Fig. 107, male palpus. Figs. 108, penis. Fig. 109, glans penis. Fig. 110, male, dorsal view. Fig. 111, male, lateral view. Fig. 112, female Chelicerae, lateral view. Fig. 113, female chelicera, second article, frontal view. Fig. 114, male Chelicerae, lateral view. Fig. 115, male chelicera, second article, frontal view
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FIGURES 94 – 105. Taracus timpanogos. Fig. 94, female palpus. Fig. 95, male palpus. Fig. 96, penis. Fig. 97, glans penis. Fig. 98 in The harvestman genus Taracus Simon 1879, and the new genus Oskoron (Opiliones: Ischyropsalidoidea: Taracidae)
2018Co-Authors: Shear, William A., Warfel, Joseph G.Abstract:FIGURES 94 – 105. Taracus timpanogos. Fig. 94, female palpus. Fig. 95, male palpus. Fig. 96, penis. Fig. 97, glans penis. Fig. 98, female, dorsal view. Fig. 99, female, lateral view. Fig. 100, male, dorsal view. Fig. 101, male, lateral view. Fig. 102, female Chelicerae, lateral view. Fig. 103, female chelicera, second article, frontal view. Fig. 104, male Chelicerae, lateral view. Fig. 105, male chelicera, second article, frontal view
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FIGURES 16 – 27. Taracus pallipes. Fig. 16, female palpus. Fig. 17, male palpus. Fig. 18, penis. Fig. 19, glans penis. Fig. 20 in The harvestman genus Taracus Simon 1879, and the new genus Oskoron (Opiliones: Ischyropsalidoidea: Taracidae)
2018Co-Authors: Shear, William A., Warfel, Joseph G.Abstract:FIGURES 16 – 27. Taracus pallipes. Fig. 16, female palpus. Fig. 17, male palpus. Fig. 18, penis. Fig. 19, glans penis. Fig. 20, female, dorsal view. Fig. 21, female, lateral view. Fig. 22, male, dorsal view. Fig. 23, male, lateral view. Fig. 24, female Chelicerae, lateral view. Fig. 25, female chelicera, second article, frontal view. Fig. 26, male Chelicerae, lateral view. Fig. 27, male chelicera, second article, frontal view
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FIGURES 116 – 126. Taracus ubicki. Fig. 116, female palpus. Fig. 117, male palpus. Figs. 118, penis. Fig. 119, glans penis. Fig. 120 in The harvestman genus Taracus Simon 1879, and the new genus Oskoron (Opiliones: Ischyropsalidoidea: Taracidae)
2018Co-Authors: Shear, William A., Warfel, Joseph G.Abstract:FIGURES 116 – 126. Taracus ubicki. Fig. 116, female palpus. Fig. 117, male palpus. Figs. 118, penis. Fig. 119, glans penis. Fig. 120, female, dorsal view. Fig. 121, female, lateral view. Fig. 122, male, dorsal view. Fig. 123, male, lateral view. Fig. 124, female Chelicerae, lateral view. Fig. 125, male Chelicerae, lateral view. Fig. 126, male chelicera, second article, frontal view
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FIGURES 77 – 88. Taracus taylori. Fig. 77, female palpus. Fig. 78, male palpus. Figs. 79 – 80, penis. Fig. 81, glans penis. Fig. 82 in The harvestman genus Taracus Simon 1879, and the new genus Oskoron (Opiliones: Ischyropsalidoidea: Taracidae)
2018Co-Authors: Shear, William A., Warfel, Joseph G.Abstract:FIGURES 77 – 88. Taracus taylori. Fig. 77, female palpus. Fig. 78, male palpus. Figs. 79 – 80, penis. Fig. 81, glans penis. Fig. 82, female, dorsal view. Fig. 83, female, lateral view. Fig. 83, male, dorsal view. Fig. 84, male, lateral view. Fig. 86, female Chelicerae, lateral view. Fig. 87, female chelicera, second article, frontal view. Fig. 88, male Chelicerae, lateral view
Shear, William A. - One of the best experts on this subject based on the ideXlab platform.
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FIGURES 106 – 115. Taracus audisioae. Fig. 106, female palpus. Fig. 107, male palpus. Figs. 108, penis. Fig. 109, glans penis. Fig. 110 in The harvestman genus Taracus Simon 1879, and the new genus Oskoron (Opiliones: Ischyropsalidoidea: Taracidae)
2018Co-Authors: Shear, William A., Warfel, Joseph G.Abstract:FIGURES 106 – 115. Taracus audisioae. Fig. 106, female palpus. Fig. 107, male palpus. Figs. 108, penis. Fig. 109, glans penis. Fig. 110, male, dorsal view. Fig. 111, male, lateral view. Fig. 112, female Chelicerae, lateral view. Fig. 113, female chelicera, second article, frontal view. Fig. 114, male Chelicerae, lateral view. Fig. 115, male chelicera, second article, frontal view
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FIGURES 94 – 105. Taracus timpanogos. Fig. 94, female palpus. Fig. 95, male palpus. Fig. 96, penis. Fig. 97, glans penis. Fig. 98 in The harvestman genus Taracus Simon 1879, and the new genus Oskoron (Opiliones: Ischyropsalidoidea: Taracidae)
2018Co-Authors: Shear, William A., Warfel, Joseph G.Abstract:FIGURES 94 – 105. Taracus timpanogos. Fig. 94, female palpus. Fig. 95, male palpus. Fig. 96, penis. Fig. 97, glans penis. Fig. 98, female, dorsal view. Fig. 99, female, lateral view. Fig. 100, male, dorsal view. Fig. 101, male, lateral view. Fig. 102, female Chelicerae, lateral view. Fig. 103, female chelicera, second article, frontal view. Fig. 104, male Chelicerae, lateral view. Fig. 105, male chelicera, second article, frontal view
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FIGURES 16 – 27. Taracus pallipes. Fig. 16, female palpus. Fig. 17, male palpus. Fig. 18, penis. Fig. 19, glans penis. Fig. 20 in The harvestman genus Taracus Simon 1879, and the new genus Oskoron (Opiliones: Ischyropsalidoidea: Taracidae)
2018Co-Authors: Shear, William A., Warfel, Joseph G.Abstract:FIGURES 16 – 27. Taracus pallipes. Fig. 16, female palpus. Fig. 17, male palpus. Fig. 18, penis. Fig. 19, glans penis. Fig. 20, female, dorsal view. Fig. 21, female, lateral view. Fig. 22, male, dorsal view. Fig. 23, male, lateral view. Fig. 24, female Chelicerae, lateral view. Fig. 25, female chelicera, second article, frontal view. Fig. 26, male Chelicerae, lateral view. Fig. 27, male chelicera, second article, frontal view
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FIGURES 116 – 126. Taracus ubicki. Fig. 116, female palpus. Fig. 117, male palpus. Figs. 118, penis. Fig. 119, glans penis. Fig. 120 in The harvestman genus Taracus Simon 1879, and the new genus Oskoron (Opiliones: Ischyropsalidoidea: Taracidae)
2018Co-Authors: Shear, William A., Warfel, Joseph G.Abstract:FIGURES 116 – 126. Taracus ubicki. Fig. 116, female palpus. Fig. 117, male palpus. Figs. 118, penis. Fig. 119, glans penis. Fig. 120, female, dorsal view. Fig. 121, female, lateral view. Fig. 122, male, dorsal view. Fig. 123, male, lateral view. Fig. 124, female Chelicerae, lateral view. Fig. 125, male Chelicerae, lateral view. Fig. 126, male chelicera, second article, frontal view
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FIGURES 77 – 88. Taracus taylori. Fig. 77, female palpus. Fig. 78, male palpus. Figs. 79 – 80, penis. Fig. 81, glans penis. Fig. 82 in The harvestman genus Taracus Simon 1879, and the new genus Oskoron (Opiliones: Ischyropsalidoidea: Taracidae)
2018Co-Authors: Shear, William A., Warfel, Joseph G.Abstract:FIGURES 77 – 88. Taracus taylori. Fig. 77, female palpus. Fig. 78, male palpus. Figs. 79 – 80, penis. Fig. 81, glans penis. Fig. 82, female, dorsal view. Fig. 83, female, lateral view. Fig. 83, male, dorsal view. Fig. 84, male, lateral view. Fig. 86, female Chelicerae, lateral view. Fig. 87, female chelicera, second article, frontal view. Fig. 88, male Chelicerae, lateral view
Antonio D. Brescovit - One of the best experts on this subject based on the ideXlab platform.
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FIGURE 127 in Revision and phylogenetic analysis of the orb-weaving spider genus Glenognatha Simon, 1887 (Araneae, Tetragnathidae)
2016Co-Authors: Jimmy Cabra-garcía, Antonio D. BrescovitAbstract:FIGURE 127. Glenognatha emertoni from USA (AMNH). A–C, male left Chelicerae. A, anterior (arrow, cheliceral basal segment projection). B, posterior. C, mesal. D–F, female left Chelicerae. D, anterior (arrow, cheliceral basal segment projection). E, posterior. F, mesal (arrow, cheliceral bulge). Scale bars, 500 µm. Prt: promarginal tooth. Ret: retromarginal tooth
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FIGURE15 in Revision and phylogenetic analysis of the orb-weaving spider genus Glenognatha Simon, 1887 (Araneae, Tetragnathidae)
2016Co-Authors: Jimmy Cabra-garcía, Antonio D. BrescovitAbstract:FIGURE15. Glenognatha florezi new species from Colombia (ICN 2141).A–C,male leftChelicerae.A, anterior.B, posterior. C, mesal. D–F, female left Chelicerae. D, anterior. E, posterior. F, mesal (arrow, cheliceral bulge). Scale bars, 100 µm. CFO: cheliceralfang outgrowth.Ret: retromarginal tooth
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FIGURE 101. Glenognatha australis. A–C in Revision and phylogenetic analysis of the orb-weaving spider genus Glenognatha Simon, 1887 (Araneae, Tetragnathidae)
2016Co-Authors: Jimmy Cabra-garcía, Antonio D. BrescovitAbstract:FIGURE 101. Glenognatha australis. A–C, male left Chelicerae (MCTP 838). A, anterior. B, posterior. C, mesal.D–F, female left Chelicerae (MCN 42102). D, anterior.E, posterior. F, mesal.Scale bars, 100 µm. Prt: promarginal tooth. Ret:retromarginal tooth
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FIGURE 61 in Revision and phylogenetic analysis of the orb-weaving spider genus Glenognatha Simon, 1887 (Araneae, Tetragnathidae)
2016Co-Authors: Jimmy Cabra-garcía, Antonio D. BrescovitAbstract:FIGURE 61. Glenognatha globosa from Colombia (ICN 5991). A–C, male left Chelicerae. A, anterior. B, posterior.C, mesal. D–F, female left Chelicerae. D, anterior. E, posterior. F, mesal. Scale bars, 100 µm. AT: anterior tooth. Prt: promarginal tooth. Ret:retromarginal tooth
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FIGURE 106. Glenognatha spherella from Mexico. A–C in Revision and phylogenetic analysis of the orb-weaving spider genus Glenognatha Simon, 1887 (Araneae, Tetragnathidae)
2016Co-Authors: Jimmy Cabra-garcía, Antonio D. BrescovitAbstract:FIGURE 106. Glenognatha spherella from Mexico. A–C, male left Chelicerae (CAS 9046858). A, anterior. B, posterior. C, mesal. D–F, female left Chelicerae (CAS 9046857). D, anterior. E, posterior (arrow, posterolateral bulge). F, mesal.Scale bars, 100 µm. Prt:promarginal tooth.Ret: retromarginal tooth
Jimmy Cabra-garcía - One of the best experts on this subject based on the ideXlab platform.
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FIGURE 127 in Revision and phylogenetic analysis of the orb-weaving spider genus Glenognatha Simon, 1887 (Araneae, Tetragnathidae)
2016Co-Authors: Jimmy Cabra-garcía, Antonio D. BrescovitAbstract:FIGURE 127. Glenognatha emertoni from USA (AMNH). A–C, male left Chelicerae. A, anterior (arrow, cheliceral basal segment projection). B, posterior. C, mesal. D–F, female left Chelicerae. D, anterior (arrow, cheliceral basal segment projection). E, posterior. F, mesal (arrow, cheliceral bulge). Scale bars, 500 µm. Prt: promarginal tooth. Ret: retromarginal tooth
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FIGURE15 in Revision and phylogenetic analysis of the orb-weaving spider genus Glenognatha Simon, 1887 (Araneae, Tetragnathidae)
2016Co-Authors: Jimmy Cabra-garcía, Antonio D. BrescovitAbstract:FIGURE15. Glenognatha florezi new species from Colombia (ICN 2141).A–C,male leftChelicerae.A, anterior.B, posterior. C, mesal. D–F, female left Chelicerae. D, anterior. E, posterior. F, mesal (arrow, cheliceral bulge). Scale bars, 100 µm. CFO: cheliceralfang outgrowth.Ret: retromarginal tooth
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FIGURE 101. Glenognatha australis. A–C in Revision and phylogenetic analysis of the orb-weaving spider genus Glenognatha Simon, 1887 (Araneae, Tetragnathidae)
2016Co-Authors: Jimmy Cabra-garcía, Antonio D. BrescovitAbstract:FIGURE 101. Glenognatha australis. A–C, male left Chelicerae (MCTP 838). A, anterior. B, posterior. C, mesal.D–F, female left Chelicerae (MCN 42102). D, anterior.E, posterior. F, mesal.Scale bars, 100 µm. Prt: promarginal tooth. Ret:retromarginal tooth
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FIGURE 61 in Revision and phylogenetic analysis of the orb-weaving spider genus Glenognatha Simon, 1887 (Araneae, Tetragnathidae)
2016Co-Authors: Jimmy Cabra-garcía, Antonio D. BrescovitAbstract:FIGURE 61. Glenognatha globosa from Colombia (ICN 5991). A–C, male left Chelicerae. A, anterior. B, posterior.C, mesal. D–F, female left Chelicerae. D, anterior. E, posterior. F, mesal. Scale bars, 100 µm. AT: anterior tooth. Prt: promarginal tooth. Ret:retromarginal tooth
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FIGURE 106. Glenognatha spherella from Mexico. A–C in Revision and phylogenetic analysis of the orb-weaving spider genus Glenognatha Simon, 1887 (Araneae, Tetragnathidae)
2016Co-Authors: Jimmy Cabra-garcía, Antonio D. BrescovitAbstract:FIGURE 106. Glenognatha spherella from Mexico. A–C, male left Chelicerae (CAS 9046858). A, anterior. B, posterior. C, mesal. D–F, female left Chelicerae (CAS 9046857). D, anterior. E, posterior (arrow, posterolateral bulge). F, mesal.Scale bars, 100 µm. Prt:promarginal tooth.Ret: retromarginal tooth
Nicholas J. Strausfeld - One of the best experts on this subject based on the ideXlab platform.
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chelicerate neural ground pattern in a cambrian great appendage arthropod
Nature, 2013Co-Authors: Gengo Tanaka, Gregory D. Edgecombe, Nicholas J. StrausfeldAbstract:Cambrian great appendage arthropods had heads that bore a claw-like appendage pair; neuroanatomical and phylogenetic analysis of a well-preserved Alalcomenaeus fossil reveals the relationship of great appendage arthropods to Chelicerata. 'Great appendage' arthropods are extinct jointed-legged creatures from the Cambrian period equipped with often large claw-like appendages of an arrangement not seen in modern arthropods. Their evolutionary relationships are much debated. Gregory Edgecombe and colleagues use micro-computed tomography to reconstruct the neuroanatomy of Alalcomenaeus, an exquisitely preserved great-appendage arthropod from China. Several characters of the nervous system are uniquely shared with the chelicerates — spiders, scorpions, mites and horseshoe crabs — placing the fossils firmly on the arthropod tree and demonstrating that chelicerate neuroanatomy had evolved by 520 million years ago. Preservation of neural tissue in early Cambrian arthropods has recently been demonstrated1, to a degree that segmental structures of the head can be associated with individual brain neuromeres. This association provides novel data for addressing long-standing controversies about the segmental identities of specialized head appendages in fossil taxa2,3. Here we document neuroanatomy in the head and trunk of a ‘great appendage’ arthropod, Alalcomenaeus sp., from the Chengjiang biota, southwest China, providing the most complete neuroanatomical profile known from a Cambrian animal. Micro-computed tomography reveals a configuration of one optic neuropil separate from a protocerebrum contiguous with four head ganglia, succeeded by eight contiguous ganglia in an eleven-segment trunk. Arrangements of optic neuropils, the brain and ganglia correspond most closely to the nervous system of Chelicerata of all extant arthropods, supporting the assignment of ‘great appendage’ arthropods to the chelicerate total group4,5. The position of the deutocerebral neuromere aligns with the insertion of the great appendage, indicating its deutocerebral innervation and corroborating a homology between the ‘great appendage’ and chelicera indicated by morphological similarities4,6,7. Alalcomenaeus and Fuxianhuia protensa1 demonstrate that the two main configurations of the brain observed in modern arthropods, those of Chelicerata and Mandibulata, respectively8, had evolved by the early Cambrian.
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chelicerate neural ground pattern in a cambrian great appendage arthropod
Nature, 2013Co-Authors: Gengo Tanaka, Gregory D. Edgecombe, Xianguang Hou, Nicholas J. StrausfeldAbstract:Preservation of neural tissue in early Cambrian arthropods has recently been demonstrated, to a degree that segmental structures of the head can be associated with individual brain neuromeres. This association provides novel data for addressing long-standing controversies about the segmental identities of specialized head appendages in fossil taxa. Here we document neuroanatomy in the head and trunk of a 'great appendage' arthropod, Alalcomenaeus sp., from the Chengjiang biota, southwest China, providing the most complete neuroanatomical profile known from a Cambrian animal. Micro-computed tomography reveals a configuration of one optic neuropil separate from a protocerebrum contiguous with four head ganglia, succeeded by eight contiguous ganglia in an eleven-segment trunk. Arrangements of optic neuropils, the brain and ganglia correspond most closely to the nervous system of Chelicerata of all extant arthropods, supporting the assignment of 'great appendage' arthropods to the chelicerate total group. The position of the deutocerebral neuromere aligns with the insertion of the great appendage, indicating its deutocerebral innervation and corroborating a homology between the 'great appendage' and chelicera indicated by morphological similarities. Alalcomenaeus and Fuxianhuia protensa demonstrate that the two main configurations of the brain observed in modern arthropods, those of Chelicerata and Mandibulata, respectively, had evolved by the early Cambrian.