Fig 1.
Holotype of Tembeassu marauna, male, MZUSP 48510, 188.3 mm LEA.
(A) Lateral view. (B) and (C) head in detail. (D) Paratype, MZUSP 23090, female, 180.7 mm LEA.
Fig 2.
Lateral view of skull of Tembeassu marauna, male, holotype, MZUSP 48510, 188.3 mm LEA.
Fig 3.
Skull of Tembeassu marauna, male, holotype, MZUSP 48510, 188.3 mm LEA.
(A) Dorsal view. (B) Ventral view.
Fig 4.
Neurocranium of Tembeassu marauna, male, holotype, MZUSP 48510, 188.3 mm LEA.
(A) Lateral view. (B) Ventral view.
Fig 5.
Suspensorium, opercular series and oral jaws of Tembeassu marauna, holotype, MZUSP 48510, 188.3 mm LEA.
(A) Lateral view. (B) Medial view. (C) Frontal view.
Fig 6.
Oral jaws of Tembeassu marauna, male, holotype, MZUSP 48510, 188.3 mm LEA.
(A) Lateral view. (B) dorsal view.
Fig 7.
Hyoid bar, branchiostegals and gill arches of Tembeassu marauna, holotype, MZUSP 48510, 188.3 mm LEA.
(A) Dorsal view. (B) Ventral view. (C) Frontal view. (D) Lateral view.
Fig 8.
Weberian apparatus of Tembeassu marauna, male, holotype, MZUSP 48510, 188.3 mm LEA.
(A) Lateral view. (B) Dorsal view. (C) Ventral view.
Fig 9.
Body (upper) and abdominal cavity (below) of Tembeassu marauna, holotype, MZUSP 48510, 188.3 mm LEA.
Fig 10.
Left pectoral girdle of Tembeassu marauna, male, holotype, MZUSP 48510, 188.3 mm LEA.
(A) Frontal view. (B) Lateral view. (C) Posterior view. Mesocoracoid, coracoid and postcleithrum not shown.
Table 1.
Morphometrics for types of Tembeassu marauna (N = 3).
Min = Minimum; Max = Maximum; SD = Standard deviation.
Fig 11.
Diagram of interrelationships among the Apteronotidae genera.
(A) Strict consensus and (B) majority-rule consensus of 99,999 equally parsimonious trees (586 steps) obtained in the maximum parsimony analysis; numbers represent the percent frequency of each node in the majority consensus [Complete trees provided in Supporting information S2–3].
Fig 12.
Two alternative phylogenetic placements of Tembeassu among the 99,999 sampled MPT’s.
(A) as the sister-group to all remaining apteronotids (strict consensus of 42,566 MPT’s; complete tree provided in Supporting information S4). (B) as the sister-group to the clade Megadontognathus + Apteronotus s. s. (strict consensus of 57,433 MPT’s; complete tree provided in Supporting information S5).
Fig 13.
Close up of preorbital region of some apteronotids.
(A) Compsaraia compsa, MZUSP 56543, 24.7 mm HL. (B) “Sternarchella” curvioperculata, MZUSP 23099, 26.6 mm HL. (C) Apteronotus acidops, MZUSP 22944, 33.1 mm HL. (D) Apteronotus lindalvae, MZUSP 120409, 34.3 mm HL. (E) Pariosternarchus amazonenses, MZUSP 48854, 32.9 mm HL. (F) Sternarchella terminalis, MPEG 3481, 28.5 mm HL. Skin flap or lateral chin lobe highlighted by a red line in A and F.
Fig 14.
Ventral view of upper lip of Distocyclus guchereauae, MNHN 2003–0013, 222.0 mm TL, paratype.