Research paper
Tectogonotoechia rivasi n. sp. A new lower Pragian Celtiberian (Spain) Ancystrorhynchoidea rhynchonellid brachiopod
JENARO L. GARCÍA-ALCALDE
Departamento de Geología, Universidad de Oviedo, c/ Jesús Arias de Velasco, s/n, 33005, Oviedo, Spain. jalcalde@uniovi.es
Corresponding author
ZARELA HERRERA
Museo de los Mares Paleozoicos, Santa Cruz de Nogueras, c/ La Unión 3, 44497, Teruel, Spain, museosantacruz@hotmail.es
ABSTRACT
A new lower Pragian Ancystrorhynchoidea rhynchonellid, Tectogonotoechia rivasi n. sp. of the Celtiberian region (Eastern Iberian Chain, EIC, and Eastern Guadarrama, EG) is described and figured. The growth of the new species, from the last neanic stage to the senescent one is specially underlined. T. rivasi n. sp. is characterized as the other species of the genus by the occurrence of a pseudoseptum and a pseudoseptalium in the dorsal interior, with a fine connectivum forming a roofed over structure covering most part of the latter. Exteriorly, the species is an entirely costate, strongly dorsibiconvex, uniplicate form lacking of marginal spines. T. rivasi n. sp. is fairly abundant in the upper part of the Nogueras Formation in the EIC and in the lower third of the Cercadillo Formation in the EG and it is usually accompanied by a varied macrofauna of brachiopods, bryozoans, solitary corals, tabulates, trilobites, ostracods and others. The biocenose of T. rivasi n. sp. is characterized by the occurrence of abundant incrusting and boring epizoans colonizing mainly the brachiopods, representing different symbiotic interactions and probably a permanent risk for the epizoans to be buried in an unstable soft substrate.
Key words: Brachiopoda Ancystrorhynchoidea, systematics, ontogeny, palaeoecology, Celtiberia, Spain.
How to cite: García-Alcalde, J.L. & Herrera, Z. 2017. Tectogonotoechia rivasi n. sp. A new lower Pragian Celtiberian (Spain) Ancystrorhynchoidea rhynchonellid brachiopod. Spanish Journal of Palaeontology, 32 (1), 115-128.
Received 21 July 2016, Accepted 4 April 2017, Published 30 June 2017
https://doi.org/10.7203/sjp.32.1.17035
