Systematic revision of the Calmoniidae (Phacopida, Trilobita) from the Devonian Ponta Grossa Formation, Paraná Basin, Brazil

Autores
Leme, J. M.; Mori, A. D.; Batista, L. A.
Año de publicación
2010
Idioma
inglés
Tipo de recurso
documento de conferencia
Estado
versión publicada
Descripción
Seventeen nominal species have been recorded among the Calmoniidae (Phacopida, Trilobita) of the Ponta Grossa Formation, Paraná Basin, Brazil. An analysis of 409 specimens from this unit revealed an overestimation of taxonomic diversity, as some of the nominal taxa previously described were based on characters derived from taphonomic processes. Some of the individuals used in the diagnosis of these nominal taxa show extensive exfoliation and effacement of the main diagnostic characters, calling for discussion of the status of several species. Thus, Calmonia signifier Clarke differs from C. subseciva Clarke only because it shows a single terminal spine, while in C. subseciva the margin is normally entire. However, in well preserved specimens, minute spines that are similar in shape and position to those of C. signifier can also be observed on the latter. The degree of inflation of the glabellar lobe has been the only character used to distinguish Paracalmonia paranaensis Popp et al. from P. cuspidata (Clarke), but the fact is that P. cuspidata is only known from compressed specimens. P. salamunii (Popp) was based on a sole poorly preserved individual. A character analysis indicates that this specimen fits in C. signifier. The holotype of Parabainella brasiliensis Popp is an exfoliated specimen, hampering thus observation of diagnostic characthers. The monospecific genus Parabainella Popp is distinguished from Bainella Rennie only by the absence of thoracic spines, a character liable of modification by breakage or weathering. Metacryphaeus granulata Popp is characterized only by the presence of glabellar granules. However, smaller granules in trilobites can also be quartz crystals, and therefore probably taphonomic in origin. Thus, following a systematic revision of the Calmoniidae, it appears that at least five nominal species from the Ponta Grossa Formation are invalid. This has important paleoecological and biostratigraphical implications.
Sesiones libres
Facultad de Ciencias Naturales y Museo
Materia
Ciencias Naturales
Paleontología
Nivel de accesibilidad
acceso abierto
Condiciones de uso
http://creativecommons.org/licenses/by-nc-sa/4.0/
Repositorio
SEDICI (UNLP)
Institución
Universidad Nacional de La Plata
OAI Identificador
oai:sedici.unlp.edu.ar:10915/16898

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spelling Systematic revision of the Calmoniidae (Phacopida, Trilobita) from the Devonian Ponta Grossa Formation, Paraná Basin, BrazilLeme, J. M.Mori, A. D.Batista, L. A.Ciencias NaturalesPaleontologíaSeventeen nominal species have been recorded among the Calmoniidae (Phacopida, Trilobita) of the Ponta Grossa Formation, Paraná Basin, Brazil. An analysis of 409 specimens from this unit revealed an overestimation of taxonomic diversity, as some of the nominal taxa previously described were based on characters derived from taphonomic processes. Some of the individuals used in the diagnosis of these nominal taxa show extensive exfoliation and effacement of the main diagnostic characters, calling for discussion of the status of several species. Thus, Calmonia signifier Clarke differs from C. subseciva Clarke only because it shows a single terminal spine, while in C. subseciva the margin is normally entire. However, in well preserved specimens, minute spines that are similar in shape and position to those of C. signifier can also be observed on the latter. The degree of inflation of the glabellar lobe has been the only character used to distinguish Paracalmonia paranaensis Popp et al. from P. cuspidata (Clarke), but the fact is that P. cuspidata is only known from compressed specimens. P. salamunii (Popp) was based on a sole poorly preserved individual. A character analysis indicates that this specimen fits in C. signifier. The holotype of Parabainella brasiliensis Popp is an exfoliated specimen, hampering thus observation of diagnostic characthers. The monospecific genus Parabainella Popp is distinguished from Bainella Rennie only by the absence of thoracic spines, a character liable of modification by breakage or weathering. Metacryphaeus granulata Popp is characterized only by the presence of glabellar granules. However, smaller granules in trilobites can also be quartz crystals, and therefore probably taphonomic in origin. Thus, following a systematic revision of the Calmoniidae, it appears that at least five nominal species from the Ponta Grossa Formation are invalid. This has important paleoecological and biostratigraphical implications.Sesiones libresFacultad de Ciencias Naturales y Museo2010info:eu-repo/semantics/conferenceObjectinfo:eu-repo/semantics/publishedVersionResumenhttp://purl.org/coar/resource_type/c_5794info:ar-repo/semantics/documentoDeConferenciaapplication/pdfhttp://sedici.unlp.edu.ar/handle/10915/16898enginfo:eu-repo/semantics/altIdentifier/isbn/978-987-95849-7-2info:eu-repo/semantics/reference/hdl/10915/25738info:eu-repo/semantics/openAccesshttp://creativecommons.org/licenses/by-nc-sa/4.0/Creative Commons Attribution-NonCommercial-ShareAlike 4.0 International (CC BY-NC-SA 4.0)reponame:SEDICI (UNLP)instname:Universidad Nacional de La Platainstacron:UNLP2025-09-29T10:53:03Zoai:sedici.unlp.edu.ar:10915/16898Institucionalhttp://sedici.unlp.edu.ar/Universidad públicaNo correspondehttp://sedici.unlp.edu.ar/oai/snrdalira@sedici.unlp.edu.arArgentinaNo correspondeNo correspondeNo correspondeopendoar:13292025-09-29 10:53:03.966SEDICI (UNLP) - Universidad Nacional de La Platafalse
dc.title.none.fl_str_mv Systematic revision of the Calmoniidae (Phacopida, Trilobita) from the Devonian Ponta Grossa Formation, Paraná Basin, Brazil
title Systematic revision of the Calmoniidae (Phacopida, Trilobita) from the Devonian Ponta Grossa Formation, Paraná Basin, Brazil
spellingShingle Systematic revision of the Calmoniidae (Phacopida, Trilobita) from the Devonian Ponta Grossa Formation, Paraná Basin, Brazil
Leme, J. M.
Ciencias Naturales
Paleontología
title_short Systematic revision of the Calmoniidae (Phacopida, Trilobita) from the Devonian Ponta Grossa Formation, Paraná Basin, Brazil
title_full Systematic revision of the Calmoniidae (Phacopida, Trilobita) from the Devonian Ponta Grossa Formation, Paraná Basin, Brazil
title_fullStr Systematic revision of the Calmoniidae (Phacopida, Trilobita) from the Devonian Ponta Grossa Formation, Paraná Basin, Brazil
title_full_unstemmed Systematic revision of the Calmoniidae (Phacopida, Trilobita) from the Devonian Ponta Grossa Formation, Paraná Basin, Brazil
title_sort Systematic revision of the Calmoniidae (Phacopida, Trilobita) from the Devonian Ponta Grossa Formation, Paraná Basin, Brazil
dc.creator.none.fl_str_mv Leme, J. M.
Mori, A. D.
Batista, L. A.
author Leme, J. M.
author_facet Leme, J. M.
Mori, A. D.
Batista, L. A.
author_role author
author2 Mori, A. D.
Batista, L. A.
author2_role author
author
dc.subject.none.fl_str_mv Ciencias Naturales
Paleontología
topic Ciencias Naturales
Paleontología
dc.description.none.fl_txt_mv Seventeen nominal species have been recorded among the Calmoniidae (Phacopida, Trilobita) of the Ponta Grossa Formation, Paraná Basin, Brazil. An analysis of 409 specimens from this unit revealed an overestimation of taxonomic diversity, as some of the nominal taxa previously described were based on characters derived from taphonomic processes. Some of the individuals used in the diagnosis of these nominal taxa show extensive exfoliation and effacement of the main diagnostic characters, calling for discussion of the status of several species. Thus, Calmonia signifier Clarke differs from C. subseciva Clarke only because it shows a single terminal spine, while in C. subseciva the margin is normally entire. However, in well preserved specimens, minute spines that are similar in shape and position to those of C. signifier can also be observed on the latter. The degree of inflation of the glabellar lobe has been the only character used to distinguish Paracalmonia paranaensis Popp et al. from P. cuspidata (Clarke), but the fact is that P. cuspidata is only known from compressed specimens. P. salamunii (Popp) was based on a sole poorly preserved individual. A character analysis indicates that this specimen fits in C. signifier. The holotype of Parabainella brasiliensis Popp is an exfoliated specimen, hampering thus observation of diagnostic characthers. The monospecific genus Parabainella Popp is distinguished from Bainella Rennie only by the absence of thoracic spines, a character liable of modification by breakage or weathering. Metacryphaeus granulata Popp is characterized only by the presence of glabellar granules. However, smaller granules in trilobites can also be quartz crystals, and therefore probably taphonomic in origin. Thus, following a systematic revision of the Calmoniidae, it appears that at least five nominal species from the Ponta Grossa Formation are invalid. This has important paleoecological and biostratigraphical implications.
Sesiones libres
Facultad de Ciencias Naturales y Museo
description Seventeen nominal species have been recorded among the Calmoniidae (Phacopida, Trilobita) of the Ponta Grossa Formation, Paraná Basin, Brazil. An analysis of 409 specimens from this unit revealed an overestimation of taxonomic diversity, as some of the nominal taxa previously described were based on characters derived from taphonomic processes. Some of the individuals used in the diagnosis of these nominal taxa show extensive exfoliation and effacement of the main diagnostic characters, calling for discussion of the status of several species. Thus, Calmonia signifier Clarke differs from C. subseciva Clarke only because it shows a single terminal spine, while in C. subseciva the margin is normally entire. However, in well preserved specimens, minute spines that are similar in shape and position to those of C. signifier can also be observed on the latter. The degree of inflation of the glabellar lobe has been the only character used to distinguish Paracalmonia paranaensis Popp et al. from P. cuspidata (Clarke), but the fact is that P. cuspidata is only known from compressed specimens. P. salamunii (Popp) was based on a sole poorly preserved individual. A character analysis indicates that this specimen fits in C. signifier. The holotype of Parabainella brasiliensis Popp is an exfoliated specimen, hampering thus observation of diagnostic characthers. The monospecific genus Parabainella Popp is distinguished from Bainella Rennie only by the absence of thoracic spines, a character liable of modification by breakage or weathering. Metacryphaeus granulata Popp is characterized only by the presence of glabellar granules. However, smaller granules in trilobites can also be quartz crystals, and therefore probably taphonomic in origin. Thus, following a systematic revision of the Calmoniidae, it appears that at least five nominal species from the Ponta Grossa Formation are invalid. This has important paleoecological and biostratigraphical implications.
publishDate 2010
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