Fig. 1
Centromochlus orca , new species, holotype, INPA 50870, female, 56.8 mm SL, mouth of Igarapé Jamari with lago de Terra Santa, rio Nhamundá basin, middle Amazonas basin, Pará State, Brazil. Lateral (a), dorsal (b) and ventral (c) views.
Fig. 2
Neurocranium of Centromochlus orca , INPA 35086, paratype, 54.1 mm SL. Dorsal view. Abbreviations: Dsp, dorsal fin spinelet; Epo, epiotic; Epop, epiotic process; Fro, frontal; io1, first infraorbital; io5, posterior ossified infraorbital; Le, lateral ethmoid; Mes, mesethmoid; Nas, nasal; Np2, middle nuchal plate; Np3, posterior nuchal plate; Pto, pterotic; Scl, posttemporal-supracleitrum; Soc, parieto-supraoccipital; Sop, suprapreopercle; Sph, sphenotic. Scale bar =1 mm.
Fig. 3
Head in lateral view of a cleared and stained specimen of Centromochlus orca , MBML 11221, 50.6 mm SL. Photo by L. Sarmento-Soares. Abbreviations: bmx, maxillary barbel; io1, first infraorbital; io5, posterior ossified infraorbital; mx, maxilla; pmx, premaxilla; sph, sphenotic.
Fig. 4
Right suspensorium, lateral view, of a. Centromochlus orca , INPA 35086, paratype, 54.1 mm SL. b. Tatia musaica , MBUCV-V 17727, paratype, 24.3 mm SL. Abbreviations: aa, angulo-articular; dn, dentary; hm, hyomandibula; io, interopercle; mt, metapterygoid; en, endopterygoid; op, opercle; po, preopercle; qu, quadrate; sb, subpreopercle; sp, suprapreopercle. Scale bar = 1 mm.
Fig. 5
Anterior vertebrae and associated bones, ventral view, of a. Centromochlus orca , INPA 35086, paratype, 54.1 mm SL. b. Tatia melanoleuca , MZUSP 30585, 53.0 mm SL. c. Centromochlus heckelii , MZUSP 8336, 62.0 mm SL. Abbreviations: n3, posterior nuchal plate, boc, basioccipital, cv, complex vertebra, Pv4, parapophysis of fourth vertebra, Pv5, parapophysis of fifth vertebra, Pv6, parapophysis of sixth vertebra, os, os suspensorium, rib, precaudal rib, scl, trans-scapular process of posttemporal-supracleithrum, tr, tripus. Scale bar = 1 mm.
Fig. 6
Right hyoid arch of Centromochlus orca , INPA 35086, paratype, 54.1 mm SL. Ventral view. Abbreviations: ac, anterior ceratohyal; br, branchiostegal rays; dh, dorsal hypohyal; ih, interhyal; pc, posterior ceratohyal; vh, ventral hypohyal; uh, urohyal; up, urohyal ventral process. Scale bar = 1 mm.
Fig. 7
Pharyngeal arches of Centromochlus orca , INPA 35086, paratype, 54.1 mm SL. Dorsal view. Abbreviations: bb2-4, basibranchials 2 to 4 (anterior to posterior); cb1-5, ceratobranchials 1 to 5 (anterior to posterior); eb1-4, epibranchials 1 to 4 (anterior to posterior); hb1-3, hypobranchials 1 to 3; pb3, pharingobranchial 3; pb4, pharingobranchial 4. Scale bar = 1 mm.
Fig. 8
Centromochlus orca , MZUEL 10467, 44.8 mm SL, adult male, showing modified anal fin. Photo by J. L. Birindelli.
Fig. 9
Centromochlus orca , new species, just after capture. Photo by H. Lazzarotto.
Fig. 10
Distribution of Centromochlus orca . Green star represents type locality.
Fig. 11
Igarapé Jamari, type locality of Centromochlus orca, rio Nhamundá basin, middle Amazonas basin, municipality of Terra Santa, Pará State, Brazil. Photo by H. Lazzarotto.
Fig. 12
Tatia musaica , MBUCV V-15663, 47.1 mm SL, morphologically similar centromochlin species from the Guiana Shield in Amazonas, Venezuela. Photo by C. DoNascimiento and N. Milani. Copyright(c) F. Provenzano and Museo de Biologia de la Universidad Central de Venezuela. Available at http://acsi.acnatsci.org/