Estudio de la segmentación postcefálica en el trilobites Protoryctocephalus arcticus Geyer & Peel, 2011 de la serie 2 del Cámbrico, Sur de China

In southern China, the Tsinghsutung Formation belonging to the Cambrian Series 2 outcrops in the Balang region. Contemplate a wide variety of organisms including Protoryctocephalus articus. For this study, 294 specimens in excellent preservation conditions were considered to analyse the ontogeny of...

Full description

Autores:
Riaño Sánchez, Ángela Johanna
Tipo de recurso:
Trabajo de grado de pregrado
Fecha de publicación:
2020
Institución:
Universidad de los Andes
Repositorio:
Séneca: repositorio Uniandes
Idioma:
spa
OAI Identifier:
oai:repositorio.uniandes.edu.co:1992/51289
Acceso en línea:
http://hdl.handle.net/1992/51289
Palabra clave:
Protoryctocephalus arcticus
Trilobites
Paleontología
Geociencias
Rights
openAccess
License
http://creativecommons.org/licenses/by-nc-sa/4.0/
Description
Summary:In southern China, the Tsinghsutung Formation belonging to the Cambrian Series 2 outcrops in the Balang region. Contemplate a wide variety of organisms including Protoryctocephalus articus. For this study, 294 specimens in excellent preservation conditions were considered to analyse the ontogeny of these organisms, to obtain the trunk development scheme. For this, an exhaustive count of thoracic segments, pygidium segments and total length of each organism was made. Eight grades were found in the meraspid phase from G8 to G15, as well as growth patterns, but they are already described for other trilobites. Per the models proposed by Hughes et al. and Minelli et al. the growth models that best matched P. articus were established. In addition, alternation was found between the anamorphic phase where the thoracic segments increase and the epimorphic phase where they remain constant, despite the tendency to increase, there is no relationship between the number of...