Figure 1.
(A) showing location of study area (inset box), and collecting localities (B) by date.
Figure 2.
Adult male of Amblyraja frerichsi (1051 mm TL) in dorsal (A) and ventral (B) views.
Scale bar 100 mm.
Figure 3.
Dermal denticles of Amblyraja frerichsi.
Dorsal view of the head (A) showing the snout and orbito-spiracular, nuchal and scapular thorns. Detailed view of malar (B), midline (C), and tail (D) thorns. (pre) preorbital, (pos) postorbital, (spi) spiracular, (nuc) nuchal, (sca) scapular, (sup) suprascapular. Scale bar 50 mm (A) or 10 mm (B−D).
Figure 4.
Coloration of Amblyraja frerichsi subadult male (985 mm TL) in dorsal (A) and ventral (B) views.
Scale bar 100 mm.
Figure 5.
Neurocranium of Amblyraja frerichsi (adult male 1194 mm TL), in dorsal (A), ventral (B), and lateral (C) views.
(af) anterior fontanelle, (bp) basal plate, (eb) epiphyseal bridge, (ecf) ethmoidal canal foramen, (ephf) endolymphatic foramen, (hm VII) hyomandibular branch foramen, (ja) jugal arches, (nc) nasal capsules, (of) orbital fissure, (pcf) preorbital canal foramen, (pd) parietal depression, (pf) posterior fontanelle, (phf) perilymphatic foramen, (pof) prootic foramen, (ptc) pteroptic crest, (ptp) pteroptic process, (ra) rostral appendix, (rc) rostral cartilage, (rn) rostral node, (rs) rostral shaft, (sc) supraorbital crest, (II) optic nerve foramen, (III) oculomotor nerve foramen, (IV) trochlear nerve foramen, (IX) glossopharyngeal nerve foramen, (X) vagus nerve foramen. Scale bar 50 mm.
Figure 6.
General structure of right clasper gland and cartilages of Amblyraja frerichsi in lateral.
(A) view partially expanded; clasper cartilages in dorsal (B) and ventral (C) views. (at1) accessory terminal 1, (at2) accessory terminal 2, (ax) axial, (cf) cleft, (dm) dorsal marginal, (dt1) dorsal terminal 1, (dt2) dorsal terminal 2, (dt3) dorsal terminal 3, (dt4) dorsal terminal 4, (hp) hypopyle, (pe) pent, (ps) pseudosiphon, (rh) rhipidion, (sh) shield, (sl) slit, (sp) spike, (sr) spur. (st) sentinel, (vm) ventral marginal, (vt) ventral terminal. Scale bar 50 mm.
Figure 7.
Dorsal view of clasper cartilages of Amblyraja frerichsi.
Abbreviations of clasper cartilages are indicated at Figure 6. Scale bar 20 mm.
Table 1.
Amblyraja frerichsi catches location, sex and depth by year of historical and recent collections.
Table 2.
Measurements (mm) of the morphometric characters taken from 35 specimens of Amblyraja frerichsi.
Table 3.
Measurements (mm) of the neurocranium taken from one specimen of Amblyraja frerichsi (adult male 1194 mm TL) expressed as percentage of nasobasal length.
Table 4.
Measurements (mm) of the egg capsules of Amblyraja frerichsi.
Figure 8.
Egg capsules of Amblyraja frerichsi in dorsal (A) and lateral (B) views.
Scale bar 50 mm.