Mimagoniates Regan, 1907

Menezes ¹, Naércio A. & Weitzman ², Stanley H., 2009, Systematics of the Neotropical fish subfamily Glandulocaudinae (Teleostei: Characiformes: Characidae), Neotropical Ichthyology 7 (3), pp. 295-370 : 323

Mimagoniates Regan, 1907

Mimagoniates Regan, 1907: 402 [type species: Mimagoniates barberi Regan (1907: 402) by monotypy].

Coelurichthys Miranda-Ribeiro, 1908 : unpaginated; type species: Coelurichthys iporangae Miranda-Ribeiro, 1908 : unpaginated (by monotypy).

Coalurichthys Miranda-Ribeiro, 1908: unpaginated; misspelling for Coelurichthys .

Diagnosis. All glandulocaudine species belonging to Mimagoniates have either a rudimentary or a fully developed caudal fin-ray pump ( Figs. 32 , 38 , 47 , 58 , 67 , 75 , and 85) not present in the other two genera, in which principal caudal-fin rays 11 and 12 are not modified ( Lophiobrycon , fig. 4 in Castro et al., 2003) or just decurved but not forming a pump ( Glandulocauda , Figs. 15 and 25 ). Additionally Mimagoniates can be distinguished from these two genera by having the dorsal-fin origin posterior to vertical through anal-fin origin ( Figs. 31 , 36 , 45 , 53 , 63 , 70 , and 78). In Lophiobrycon ( Figs. 3 and 4 ) the dorsal-fin origin is anterior to vertical through anal-fin origin and closer to snout tip than to caudal-fin base and in Glandulocauda ( Figs. 11-12 and 20-21 ) the dorsal-fin origin is slightly ahead of vertical through anal-fin origin. Also, in Mimagoniates adult males have no more than 1 hook on anal-fin rays that bear hooks, although sometimes 2 hooks might be present on anterior most branched ray and 3 on longest unbranched anterior ray ( Figs. 33 , 39 , 50 , 56 , 65 , 73 , and 81) whereas in Glandulocauda species more than one hook are present on anal-fin rays that bear hooks ( Figs. 16 and 26 ).

Figures

Fig. 32. Mimagoniates inequalis, adult male, MCP 9892, 37.0 mm SL; osteology of caudal skeleton and caudal-fin squamation (lower left inset) lateral view, left side. Cartilage represented by crosshatching.

Fig. 38. Mimagoniates barberi, adult male, UMMZ 205420, 35.6 mm SL; osteology of central basal region of caudal skeleton, principal caudal-fin rays 6-15, lateral views, left side, anterior is at left. Principal ray 12 indicated by arrow. (a) Illustrates glandular groove between rays 11 and 12. (b) Illustrates relationship of modified dorsal caudal-fin lobe squamation to glandular groove. Modified scales together their epidermis form movable flap just lateral to surface of rays and groove that bear most of glandular tissue. Modified from Menezes & Weitzman (1990).

Fig. 47. Mimagoniates pulcher, developing male, MNRJ 4233, 34.2 mm SL; osteology of principal caudal rays 7-15, lateral view, left side, anterior at right.

Fig. 58. Mimagoniates lateralis, adult male, USNM 236088, 31.6 mm SL; caudal skeleton, lateral view, left side, anterior at left. Inset at lower left illustrates modified dorsal lobe caudal-fin squamation in relation to osteological structures of caudal organ. Modified from Weitzman et al. (1988).

Fig. 67. Mimagoniates sylvicola, adult male, USNM 300364, 32.5 mm SL; osteology of central basal region of caudal-fin skeleton, principal fin rays 6-15, lateral view, left side, anterior at left. Principal caudal-fin ray 12 indicated by arrow. (a) Illustrates area of fully developed caudal organ. (b) Illustrates relationship of modified dorsal-fin squamation to pump chamber skeleton. Modified from Menezes & Weitzman (1990).

Fig. 75. Mimagoniates rheocharis, adult male, USNM 279879, paratype, 45.4 mm SL; osteology of central basal region of caudal-fin skeleton, principal fin rays 6-15, lateral view, left side, anterior at left. Principal caudal-fin ray 12 indicated by arrow. (a) Illustrates area of fully developed caudal organ. (b) Illustrates relationship of modified dorsal-fin squamation to pump chamber skeleton.Modified from Menezes & Weitzman (1990).

Fig. 15. Glandulocauda melanopleura, adult male, USNM 236093, 40.2 mm SL; osteology of caudal skeleton and caudal-fin squamation of dorsal portion of caudal-fin lobe (lower left insert), lateral view, left side, anterior at left.Modified from Menezes &Weitzman (1990).

Fig. 25. Glandulocauda caerulea, adult male, USNM 326756, 39.4 mm SL; caudal skeleton and fin rays. Cartilage outlined by dashed lines. Lateral view, left side.

Fig. 31. Mimagoniates inequalis, male, MZUSP 75515, 33.1 mm SL; central region of caudal-fin base and fin showing beaded tissue indicated by arrow along borders of principal caudal-fin rays 11-14. Upper cluster of beaded tissue primarily positioned along borders of rays 11 and 12, rays that border groove of primitive caudal pump.

Fig. 36. Mimagoniates barberi, male above, UMMZ 205420, 35.6 mm SL, female below, SL 26.8 mm, Paraguay, San Pedro, rio Aguarai-mi, tributary to rio Paraguay, paratypes.

Fig. 45. Mimagoniates pulcher, male, MNRJ 17814, SL 35.0 mm SL, Brazil, Mato Grosso, “Porto Velho-São Luís de Cáceres”, holotype.

Fig. 53. Mimagoniates lateralis, live adult male, USNM 254268, 29.9 mm SL, Brazil, Paraná State, unnamed blackwater stream emptying into Atlantic Ocean about 5 km S of Guaratuba.

Fig. 63. Mimagoniates sylvicola, young adult male, MZUSP 36612, holotype, 30.2 mm SL, Brazil, Bahia, município de Prado, unnamed forest rivulet near Fazenda Embaçuaba, 8-9 km NW of Cumuruxatiba. Modified from Menezes & Weitzman (1990).

Fig. 70. Mimagoniates rheocharis,adult male, MZUSP 40278, holotype, 47.3 mm SL, Brazil, Santa Catarina State,rio Faxinalzinho at Mãe dos Homens, near Praia Grande. Modified from Menezes & Weitzman (1990).

Fig. 3. Lophiobrycon weitzmani, paratype, adult male, LIRP 4338, 33.1 mm SL, Brazil, Minas Gerais, rio Grande basin, upper rio Paraná, município de Delfinópolis, Estância Carmen Sílvia, córrego Bom Jesus. Modified from Castro et al. (2003).

Fig. 4. Lophiobrycon weitzmani, paratype, adult female. MZUSP 83353, 21.8 mm SL; same locality data as in Fig. 3.

Fig. 11. Glandulocauda melanopleura, adult male. USNM 236415, 42.3 mm SL, Brazil, São Paulo State, headwater stream of rio Tietê near Paranapiacaba. Modified from Weitzman et al. (1988).

Fig. 12. Glandulocauda melanopleura, adult female. USNM 236415, 37.5 mm SL, São Paulo State, headwater stream of rio Tietê near Paranapiacaba. Modified from Weitzman et al. (1988).

Fig. 20. Glandulocauda caerulea, adult male, USNM 326756, 43.9 mm SL, Brazil, Paraná State, brook tributary to rio Iguaçu near Lara Maria Ranch.

Fig. 21. Glandulocauda caerulea, adult female, USNM 326756, 41.0 mm SL, Brazil, Paraná State, brook tributary to rio Iguaçu near Lara Maria Ranch.

Fig. 33. Mimagoniates inequalis, adult male, MCP 9892, 37.0 mm SL; anterior 12 anal-fin rays, lateral view, left side. First branched ray bears two hooks.

Fig. 39. Mimagoniates barberi, adult male, UMMZ 205420, 32.7 mm SL; anterior 13 anal-fin rays, lateral view, left side.

Fig. 50. Mimagoniates pulcher, developingmale, MNRJ 4233, 37.0 mm SL; anterior 13 anal-fin rays, lateral view, left side.

Fig. 56. Mimagoniates lateralis, adult male, USNM 236088, 31.6mm SL; anterior 9 anal-fin rays of adult male, lateral view, left side.

Fig. 65. Mimagoniates sylvicola, adult male, USNM 300634, 32.5 mm SL; anterior 11 anal-fin rays, lateral view, left side. Modified from Menezes & Weitzman (1990).

Fig. 73. Mimagoniates rheocharis, adult male, USNM 279879, paratype, 45.4 mm SL; anterior 13 anal-fin rays of adult male, lateralview,leftside.Modified fromMenezes&Weitzman(1990).

Fig. 16. Glandulocauda melanopleura, adult male, USNM 236415, 42.6 mm SL; anal-fin rays, lateral view, left side.

Fig. 26. Glandulocauda caerulea, adult male, USNM 326756, 39.4 mm SL; anal-fin rays, lateral view, left side.Lateral view, left side.