Ideal distal tarsal 4 (Figures 11m–o) is managed and has an effective posteromedial processes. The rounded proximal skin was a bit concave with a back to your the fresh new rear bit. An obvious element is located into posterolateral top who articulate into proximal portion of metatarsal V. Posterior for the part to possess metatarsal V try a low-articular skin with fossae and foramina. The side is actually concave and you can articulated which have metatarsal IV. Merely dorsal to that articulation a good concavity is available which can keeps fit the next tarsal. Distal tarsal 4 regarding R. callenderi is much more similar to that of phytosaurs (elizabeth.grams., AMNH FR 3001) rather than paracrocodylomorphs (e.g., ‘H. agilis‘, YPM 41198; Nesbitt, 2011 ).
Metatarsal I possess a horizontal extension within proximal stop you to anterodorsally overlaps metatarsal II
The fresh new metatarsals (Numbers 11p, q), exclusive out of metatarsal V, express the next letters: proximal and you may distal expansions, convex distal ends, deep lateral tendon pits, and you may strong extensor pits on dorsal counters such as really archosauriforms (Nesbitt, 2011 ). As well, the fresh distal counters is rectangular-shaped, mediolaterally large than dorsoventrally strong, having a gap in the new posterior front. In the proximal view, metatarsal We try ellipsoid. A couple of metatarsals portray II and you may III, however, given that you’re incomplete, it is sometimes complicated so you’re able to assign these bones a situation. Metatarsal II and you will III will be the longest, thickest from the midshaft, and also have the best distal extension. Metatarsal IV is the thinnest at midshaft and that is the new very gracile of your five metatarsals. The fresh new strongly hooked metatarsal V (Contour 11p), represented off PEFO 34269 (maintained dorsal front side-right up within the good cut-off away from almost every other factors), holds a huge proximal surface to own articulation which have distal tarsal cuatro. The newest distal prevent tapers so you’re able to a tiny articular facial skin having get in touch with towards the phalanges. The majority of the brand new phalanges try known; yet not, because of disarticulation, the new project so you’re able to a fist in addition to acquisition try impossible to reconstruct. It is possible your phalangeal formula was dos-3-4-4-?, similar to that of almost every other very early-diverging archosaurs. New asymmetrical unguals has concave articular elements and you can arc ventrally. This new ventral top are flat in addition to unguals try triangular in the cross-section. Which morphology is similar to regarding some aetosaurs (age.g., An excellent. ferratus, SMNS 5771-S22; Good. scagliai, PVL 2052; Letter. engaeus, PVL 3525), but differs from the brand new mediolaterally compacted unguals of phytosaurs (e.g., UCMP 34239), P. chiniquensis (SNSB-BSPG XXV 11e), and Roentgen. tenuisceps (PVL 3827).
R. callenderi and contains a complex dermal skeleton of square osteoderms which cover new dorsal and you will ventral counters of your animal (Data 7b, 12h). Brand new dorsal armour consists of a couple paramedian columns out-of dishes you to straddle the brand new midline of the animal much like the carapace of of numerous pseudosuchians, and two articles from associated horizontal colombian cupid Birine NasД±l Mesaj osteoderms delivering five dorsal osteoderms for each and every line as in aetosaurs (Desojo mais aussi al., 2013 ). There isn’t any evidence you to R. callenderi possessed “sublateral” osteoderms like those found in A beneficial. geoffreyi ( ). Each line from osteoderms for the R. callenderi corresponds to an underlying vertebra (Look ainsi que al., 2005 ). Brand new ventral armour include at the very least five columns off rectangular so you can square (anteroposteriorly longer than mediolaterally wider) osteoderms which takes care of the latest thorax and you can tail. This new posteriormost osteoderms of your own end co-ossify to make a pipe-like caudal sheath. This is simply not clear in the event that you can find gular osteoderms such as phytosaurs (age.g., UCMP 27235). Neither is it clear when the there have been brief appendicular osteoderms since into the aetosaurs (e.grams., Coahomasuchus kahleorum, NMMNHS P-18496; A great. scagliai. PVL 2052) or even in erpetosuchids (elizabeth.g., T. ruthae) (Ezcurra mais aussi al., 2017 ; Heckert & Lucas, 1999 ).