Fig 1.
Regional setting and geological maps.
(A) Situation of the localities in the Pyrenees. (B-D) Detailed geological maps of Erillcastell (B), Buira (C) and Port del Cantó (D) localities.
Fig 2.
Stratigraphic correlation panel of the three studied localities.
Triassic logged sections (I-IX) and location of tetrapod ichnotaxa (A-J).
Fig 3.
Triassic facies examples from the studied localities of the Catalan Pyrenees.
Facies codes correspond to those of the text.
Fig 4.
Buntsandstein fluvial facies at the Erillcastell locality, including the Tossal de Pollerini tracksite.
The dashed black square in the top picture corresponds to the detail of the fluvial systems in the bottom photo.
Fig 5.
Prorotodactylus mesaxonichnus isp. nov. tracks I.
(A) Trackway of the holotype (IPS-93870) and outline of the ichnites with the trackmaker (euparkeriid or basal archosauriform) silhouettes in plant view (idealized position in four consecutive tracks) and profile view (position during locomotion). (B) 3D photogrammetric model of a manus-pes set squared in (A).
Fig 6.
Prorotodactylus mesaxonichnus isp. nov. tracks II.
(A) Trackway of the paratype IPS-93867 and outline of the ichnites. (B, C) Detail of a manus-pes set (B) and a pes track (C) of the trackway with the 3D models and correlated with the limbs of Euparkeria capensis (modified from Nesbitt, 2011 and Bernardi et al., 2015); note that bones and ichnites are at the same scale. (D) Paratype of a well-preserved pes completely overstepping the manus (IPS-93867). (E) Paratype of the manus-pes set of IPS-93871. (F, G) Right pes tracks with prevalence impression of digits II, III and IV (tridactyl function); M and P in (E) refer to manus and pes tracks, respectively.
Fig 7.
Prorotodactylus mesaxonichnus isp. nov. tracks III.
(A, B) Manus-pes sets with 3D models and ichnites outline of the paratypes IPS-93868 (A) and IPS-93869 (B). (C) Trampled surface with most of the tracks advancing in the same direction (Westwards).
Fig 8.
Prorotodactylus mesaxonichnus isp. nov. tracks IV.
(A) Manus-pes set with the 3D model and ichnites outline. (B-N) Isolated sets, manus and pes tracks with different states of preservation. (O) Pes track with digit scratches and large pes with prevalence of digits II, III and IV. Note the characteristic hooked digit tips (D-G), tracks resembling Rhynchosauroides due to the dragging of digit tips (E, I). All tracks scaled at 10 mm except the manus in (B), which is at 5 mm. All tracks are from Tossal de Pollerini site (Erillcastell).
Fig 9.
Prorotodactylus mesaxonichnus isp. nov. tracks V.
Isolated impressions with a different preservation state (probably corresponding to undertracks or overtracks). Note the same kind of preservation despite tracks are small (A, C) or large (B). All tracks are from Port del Cantó, at sections VI (A), VIII (B) and VII (C).
Fig 10.
cf. Rotodactylus (Port del Cantó, section VI).
Isolated manus track with the 3D model and ichnite outline. Note the longest digit III and the backwards rotated digit V.
Fig 11.
Chirotheriid Morphotype I (Port del Cantó, section VIII).
(A) Manus-pes set (mold IPS-82616). (B) Ichnites outline. (C, D) 3D models of manus and pes tracks, respectively.
Fig 12.
Chirotheriid Morphotype II (Port del Cantó, section VIII).
Isolated ichnite with the 3D model and outline.
Fig 13.
Fossil assemblage, paleoenvironment and biochronologic interval.
(A) Prorotodactylus mesaxonichnus isp. nov. (B) cf. Rotodactylus. (C-E) Chirotheriid tracks: Morphotype I (C), Morphotype II (D) and Morphotype indet. (E). (F-H) Rhynchosauroides tracks: R. cf. schochardti (F), R. isp. indet. 1 (G) and R. isp. indet (H). (I) Undetermined Morphotype A. (J, K) Swimming scratches of Characichnos isp. of small (J) and large (K) size. (L) Arthropod body impressions. (M) Invertebrate burrows. (N) Trunk mark. (O) Plant remain. (P) Paleoenvironmental reconstruction of the Triassic Pyrenean Basin (faunas and plants are not scaled). (Q) Prorotodactylus-Rotodactylus zone (P.-R. zone; grey interval) correlated with the Triassic biochronological intervals (see text for explanation of 1, 2 and 3). FAD: First Appearance Datum. IND.: Induan.
Table 1.
Minimum, maximum and mean values of the track parameters from the identified trackways of Prorotodactylus mesaxonichnus isp. nov.
Table 2.
Mean values of the parameters from each identified trackway of Prorotodactylus mesaxonichnus isp. nov.
Table 3.
Facies with tetrapod footprints, plant stems and impressions, and invertebrate ichnites.