The trace fossil Diopatrichnus santamariensis nov. isp. – a shell armored tube from Pliocene sediments of Santa Maria Island, Azores (NE Atlantic Ocean) - 08/12/17

Doi : 10.1016/j.geobios.2017.09.002

Alfred Uchman ^a,^⁎ , Victor Quintino ^b, Ana Maria Rodrigues ^b, Markes E. Johnson ^c, Carlos S. Melo ^d,^e,^f,^g, Ricardo Cordeiro ^d,^f, Ricardo S. Ramalho ^h,^i,^j, Sérgio P. Ávila ^d,^e,^f
^a Institute of Geological Sciences, Jagiellonian University, Gronostajowa 3a, 30-387 Kraków, Poland
^b Department of Biology & CESAM, University of Aveiro, 3810-193 Aveiro, Portugal
^c Department of Geosciences, Williams College, 01267 Williamstown, MA, USA
^d CIBIO, Centro de Investigação em Biodiversidade e Recursos Genéticos, InBIO Laboratório Associado, Pólo dos Açores, Universidade dos Açores, Rua da Mãe de Deus, 9500-321 Ponta Delgada, Açores, Portugal
^e Departamento de Biologia, Faculdade de Ciências e Tecnologia, Universidade dos Açores, 9501-801 Ponta Delgada, Açores, Portugal
^f MPB-Marine PalaeoBiogeography Working Group of the University of the Azores, Rua da Mãe de Deus, 9501-801 Ponta Delgada, Açores, Portugal
^g Department of Geology, Faculty of Science of the University of Lisbon, 1749-016 Lisboa, Portugal
^h Instituto Dom Luiz, Faculdade de Ciências da Universidade de Lisboa, 1749-016 Lisboa, Portugal
ⁱ School of Earth Sciences, University of Bristol, Wills Memorial Building, Queen's Road, BS8 1RJ Bristol, UK
^j Lamont-Doherty Earth Observatory at Columbia University, 61 Route 9W, P.O. Box 1000, 10964–8000 Palisades, NY, USA

^⁎Corresponding author.

Abstract

Diopatrichnus santamariensis nov. isp. from lower Pliocene sediments on Santa Maria Island in the Azores Archipelago (mid-North Atlantic) represents the third ichnospecies of Diopatrichnus Kern, as characterized by a vertical or inclined tube armoured mainly by bivalve shells that are mostly perpendicular to the burrow axis and concave-upward. The polychaete Owenia (family Oweniidae) is favoured as its potential tracemaker based on recent analogues, as opposed to the alternative polychaete Diopatra (family Onuphidae). The tracemaker was able to cross oceanic depths, distances, and colonize mid-ocean island sediments. In general, including this example from Santa Maria Island, Diopatrichnus occurs mostly within the Skolithos and the Cruziana ichnofacies.

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Keywords : Ichnology, Ichnotaxonomy, Oceanic islands, Shallow-marine clastics, Polychaetes, Santa Maria Island, Azores

Plan

Ponta do Cedro section

Systematic paleoichnology

Discussion

Ichnospecies affinity

Ethological interpretation of morphology and tracemaker affinity

Palaeoenvironmental and stratigraphic range

Conclusions

☆	Corresponding editor: Emmanuel Fara.

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Vol 50 - N° 5-6

P. 459-469 - décembre 2017 Retour au numéro

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The trace fossil Diopatrichnus santamariensis nov. isp. – a shell armored tube from Pliocene sediments of Santa Maria Island, Azores (NE Atlantic Ocean) - 08/12/17

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