Ideal distal tarsal 4 (Numbers 11m–o) was managed and also an effective posteromedial process. The fresh circular proximal epidermis try somewhat concave which have a heel to your the new rear portion. A very clear aspect is positioned to the posterolateral side who would articulate with the proximal portion of metatarsal V. Rear for the part to have metatarsal V try a low-articular epidermis with fossae and you will foramina. The medial side was concave and you may articulated having metatarsal IV. Only dorsal compared to that articulation a concavity is obtainable that can has actually match the third tarsal. Distal tarsal cuatro away from R. callenderi is far more like phytosaurs (e.g., AMNH FR 3001) than to paracrocodylomorphs (elizabeth.grams., ‘H. agilis’, YPM 41198; Nesbitt, 2011 ).
Metatarsal We possess a lateral extension at the proximal avoid you to definitely anterodorsally overlaps metatarsal II
The brand new metatarsals (Figures 11p, q), exclusive off metatarsal V, display next letters: proximal and you can distal expansions, convex distal ends up, deep lateral ligament pits, and you will deep extensor pits on the dorsal counters as in very archosauriforms (Nesbitt, 2011 ). On top of that, the fresh new distal counters are square-shaped, mediolaterally wider than dorsoventrally strong, that have a space in the center of this new rear front side. Inside proximal evaluate, metatarsal I is actually ellipsoid. A couple of metatarsals show II and you may III, however, as a person is incomplete, it is difficult so you can assign these bones a situation. Metatarsal II and you will III will be the longest, thickest from the midshaft, and have the most readily useful distal extension. Metatarsal IV ‘s the thinnest at midshaft that is new extremely gracile of your five metatarsals. The latest firmly hooked metatarsal V (Shape 11p), illustrated of PEFO 34269 (maintained dorsal front-upwards inside a beneficial cut off off almost every other issues), bears a big proximal epidermis to own articulation with distal tarsal cuatro. The new distal avoid tapers to a small articular body to possess get in touch with with the phalanges. Almost all of the new phalanges is known; although not, due to disarticulation, this new task so you’re able to a digit in addition to acquisition is actually impractical to reconstruct. It’s possible that the phalangeal formula are dos-3-4-4-?, like most other early-diverging archosaurs. The fresh new asymmetrical unguals keeps concave articular issues and arch ventrally. The fresh ventral top is flat while the unguals was triangular inside the cross-point. This morphology is much like compared to some aetosaurs (age.g., A. ferratus, SMNS 5771-S22; An effective. scagliai, PVL 2052; N. engaeus, PVL 3525), however, is different from the mediolaterally compacted unguals regarding phytosaurs (e.grams., UCMP 34239), P. chiniquensis (SNSB-BSPG XXV 11e), and you can R. tenuisceps (PVL 3827).
5.8 Osteoderms
Roentgen. callenderi features a complex dermal bones off square osteoderms which cover the brand new dorsal and you may ventral surfaces of your own creature (Data 7b, 12h). The dorsal armour contains several paramedian articles from dishes one straddle the newest midline of the creature similar to the carapace of of several pseudosuchians, and two columns of associated lateral osteoderms bringing five dorsal osteoderms for every row as in aetosaurs (Desojo et al., 2013 ). There is absolutely no facts you to Roentgen. callenderi possessed “sublateral” osteoderms like those used in An effective. geoffreyi ( ). Per row away from osteoderms in Roentgen. callenderi corresponds to a fundamental vertebra (Search mais aussi al., 2005 ). The latest ventral armor contains at the least five columns regarding square so you’re able to rectangular (anteroposteriorly longer than mediolaterally wide) osteoderms which covers this new thorax and you can tail. The posteriormost osteoderms of your end co-ossify in order to create a pipeline-for example caudal sheath. That isn’t clear if there are gular osteoderms as in phytosaurs (age.grams., UCMP 27235). Neither is it clear in the event that there had been short appendicular osteoderms due to the fact from inside the aetosaurs (elizabeth.grams., Coahomasuchus kahleorum, NMMNHS P-18496; An effective. scagliai. PVL 2052) or in erpetosuchids (elizabeth.grams., T. ruthae) (Ezcurra et al., 2017 ; Heckert & Lucas, 1999 ).