FIGURE 1 |
Terminology of thorns. alt, alar; idt, interdorsal; iot, interorbital; ist, interespiracular; mct, mediocaudal; mdt, middorsal; mot, midorbital; nut, nuchal; pet, preorbital; pot, postorbital; rst, rostral; sct, scapular; spt, spiracular.
FIGURE 2 |
A. Drawing of
Rioraja agassizii provided by
Müller, Henle, (1841)Müller J, Henle FGJ. Systematische Beschreibung der Plagiostomen. Berlin: Veit; 1841. Available from: https://www.biodiversitylibrary.org/item/30065#page/5/mode/1up
https://www.biodiversitylibrary.org/item...
.
B. Dorsal view of MNHN 2430, male, 405 mm TL (lectotype designated herein and modified from MNHN database). Scale bar = 20 mm.
FIGURE 3 |
External morphology and color pattern of Rioraja agassizii. A. dorsal view and B. ventral view of MZUSP (uncatalogued), 424 mm TL; C. dorsal view and D. ventral view of UERJ 1569, female, 466 mm TL; E. MZUSP 117280, female, 543 mm TL; F. MNRJ 50512, female, 505 mm TL. Scale bars = 10 cm.
FIGURE 4 |
Ventral view of the head of Rioraja agassizii. A. MZUSP 117280, female, 543 mm TL. B. USP (uncatalogued), male. Scale bars = 20 mm.
FIGURE 5 |
Neurocranium of Rioraja agassizii, MZUSP 117280, female, 543 mm TL. A. dorsal, B. ventral views. af, anterior fontanelle; bp, basal plate; epb, epiphysial bridge; end, endolymphatic foramen; icf, internal carotid artery foramen; inc, inner nasal cartilage; ins, internasal space; ja, jugal arch; na, nasal aperture; nc, nasal capsule; oc, otic capsule; occ, occipital condyle; onc, outer nasal cartilage; opf, ophthalmic foramen; peri, perilymphatic foramen; pf, posterior fontanelle; pnc, posterior nasal cartilage; pos, postorbital process; pre, preorbital process; ptp, pterotic process; ra, rostral appendix; rb, rostral base; rn, rostral node; rs, rostrum. Scale bar = 10 mm.
FIGURE 6 |
Neurocranium of Rioraja agassizii, MNRJ 50512, female, 505 mm TL. A. dorsal, B. ventral, C. lateral views. II, foramen for the optic nerve; III, foramen for the oculomotor nerve; IV, foramen for the trochlear nerve; VI, foramen for the abducens nerve; acvf, anterior canal vein foramen; af, anterior fontanelle; antf, antorbital facet; apba, foramen for the afferent pseudobranchial artery bp, basal plate; epb, epiphysial bridge; end, endolymphatic foramen; ethn, foramen for the passage of the ethmoidal nerve; fm, foramen magnum; hf, hyomandibular facet; hVII, foramen for the passage of the hyomandibular ramus of the facialis nerve; icf, internal carotid artery foramen; inc, inner nasal cartilage; ins, internasal space; ja, jugal arch; na, nasal aperture; nc, nasal capsule; oc, otic capsule; occ, occipital condyle; onc, outer nasal cartilage; opc, opistotic crest; opd, optic pedicel; opf, ophthalmic foramen; ornc oronasal canal; peri, perilymphatic foramen; pf, posterior fontanelle; pfc, prefacial commissure; pnc, posterior nasal cartilage; pos, postorbital process; pre, preorbital process; prf, parietal fossa; prof, prootic formamen; ptp, pterotic process; ra, rostral appendix; rb, rostral base; rn, rostral node; rs, rostrum; soc, supraorbital crest; sopf, superficial ophtalmic foramen.
FIGURE 7 |
Visceral arches of Rioraja agassizii, MNRJ 50512, female, 505 mm TL. A. jaws; B, D. dorsal and C, E. ventral views of hyoid and gill arches. abc, anterior portion of basibranchial copula; bbc, basibranchial copula; bh, basihyal; cb 1–5, ceratobranchials I–V; mck, Meckel’s cartilage; cph, cerato-pseudohyoid; eb 1–5, epibranchials I–V; eph, epi-pseudohyoid; hb 2–4, hypobranchials II–IV; lpbh, lateral projection of basihyal; pb 1–5, pharyngobranchials I–V; pq, palatoquadrate. Scale bar = 5 mm.
FIGURE 8 |
Pelvic girdle and fin skeleton of Rioraja agassizii, MNRJ 50512, female, 505 mm TL. 1pvr, first pelvic radial segment; 1pvrc, condyle for the first pelvic radial segment; bpt, basipterygium; lpp, lateral pelvic process; obf, obturator foramen; pib, pubischiadic bar; pvr, pelvic radial segments. Scale bar = 10 mm.
FIGURE 9 |
Map showing the geographic distribution of Rioraja agassizii based on material examined in this study (red) and literature (blue).