First pachycormiform (Actinopterygii, Pachycormiformes) remains from the 10 Late Jurassic of the Antarctic Peninsula and remarks on bone alteration by recent bioeroders

LUCIANO L. RASIA; ROBERTO A. SCASSO; LUCIANO L. RASIA; ROBERTO A. SCASSO; SOLEDAD GOUIRIC-CAVALLI; VILMA ROSATO; SOLEDAD GOUIRIC-CAVALLI; GONZALO J. MÁRQUEZ; VILMA ROSATO; MARCELO REGUERO; GONZALO J. MÁRQUEZ; MARCELO REGUERO

JOURNAL OF VERTEBRATE PALEONTOLOGY

SOC VERTEBRATE PALEONTOLOGY

Lugar: Lawrence; Año: 2019 p. 1 - 10

0272-4634

We describe here osteichthyan remains from the Upper 90 Jurassic of theAmeghino (=Nordenskjöld) Formation of the Antarctic Peninsula. The fish bones are referred to a suspension-feeding pachycormid based on the shape, morphology andpresence of acu fanunculi (needle-teeth) on their gill rakers. Due to the fragmentary condition of the Antarctic material, we refer it to aff. Asthenocormus. The fish remainsdescribed herein represent the first record of a suspension-feeding pachycormid in the LateJurassic of the Antarctic Peninsula, being the oldest pachycormid yet recovered fromAntarctica. The new fossil fish supports a possible early dispersion route through theMozambique Corridor or the Trans-Gondwana Seaway. We also describe the weatheringproduced by modern lichens which might be misinterpreted as original bone structure.