Check List 8(4): 784–786, 2012 © 2012 Check List and Authors Chec List ISSN 1809-127X (available at www.checklist.org.br) Journal of lists and distribution

n First record of inequalis

istributio (Eigenmann, 1911) D María(: de las Mercedes Azpelicueta ) 1* and Stefan fromKoerber 2Argentina raphic g eo

G 2 Friesenstr. 11, 45476 Muelheim, Germany.

n 1 CONICET- Museo de La [email protected], Paseo del Bosque s/n, 1900 La Plata, . o

* Corresponding author: otes N

Abstract: In the present note, we cite from the río Paraná de las Palmas, close to Buenos Aires City.

This record represents the first one for Argentina.

Mimagoniates The measurements and counts of six adults are presented in Table 1. Measurements and counts were taken The characid Regan, 1907 includes seven species defined by having a rudimentary or fully developed caudal-fin pump and theM. dorsal-fin inequalis, following Menezes and Weitzman (1990). Percentages of origin posterior to a vertical through anal-fin origin. In the authorsdifferent mentioned values in SL 2.8-3.0 or HL for have the similar body depth values at to dorsal- those three basal species of the genus, including presented by Menezes and Weitzman (2009). These the principal caudal-fin rays 11 and 12 are curved and enlargedMimagoniates and have barberi a groove between themM. (Menezesinequalis and (Ei- lateralfin origin; series the 36-38, specimens predorsal examined scales have 17-18, scarcely scales low between body Weitzman 2009).M. lateralis M. microlepis (3.0-3.22). Counts of scales are as follows: Scales in the M. pulcher Regan, Menezes 1907, and Weitzman, genmann,2009, M. reocharis 1911), Menezes (Nichols,and Weitzman, 1913), 1990, and M. dorsal-fin and pelvic-fin origins 13-15, scale rows around (Steindachner,sylvicola Menezes 1877), and Weitzman, 1990, live in Atlantic af- foundcaudal differences peduncle 15-16; between counts males are and similar females. to theCounts values of presented by Menezes and Weitzman (2009). We did not - fluents between Bahia (Brazil) and Uruguay, in the upper fin rays: Dorsal fin ii,8-9, anal fin iv,25-29, pectoral fin i,6-7, río Paraguay, the upper río Iguazú, and the middle and up per río Paraná. The southernmost limit of the geographic distribution of the genus is reported from the HumedalesM. inequa- lisdel Este, Departamento Rocha, Uruguay, in small ponds and streams flowing into the Atlantic Ocean, where wasMimagoniates collected by inequalis Azpelicueta was alsoand recordedGarcía (2001) from intribu the- surroundings of the Laguna de Castillos (34°18’ S, 53°55’ etW). al taries of the upper río Negro, in Rivera, Uruguay (Menezes found. 2008), M. barberi a locality in two corresponding different localities to the basin in the of Paranáthe río de la Plata (Figure 1). Mantinian and Miquelarena (2010) The objective of this paper is to report M. inequalis from Riverthe río basin, Paraná Misiones, de las Argentina.Palmas, west of the city of Buenos onlyAires the (Figure second 1). Thisrecord record of the is thespecies first offrom this the species Río defrom la PlataArgentina, basin. the first from the Paraná basin and the so far Mimagoniates inequalis

is distinguished from other Figure 1. Collection sites of Mimagoniates inequalis species of the genus by the presence of 26-30 branched as mentioned: the anal-fin rays, 34-41 scales in the lateral line, 15-18 scale Wikipedia,new locality dots in Argentinawere added. (magenta); Rivera, Uruguay (yellow), and the rows between dorsal-fin origin and anal-fin origin, and the Laguna de Castillos, Uruguay (green). Satellite image was taken from dorsal fin closer to caudal-fin base than to tip of snout. 784 Azpelicueta and Koerber | Mimagoniates inequalis in Argentina

Table 1. Measurements of six specimens of Mimagoniates inequalis from

the Río de la Plata basin, in Argentina. MEAN MIN MAX SL 25.56 33.32 Percentage of SL 31.86 31.59 32.19 56.32 54.34 58.75 Depth at dorsal-fin origin 25.82 24.40 26.62 Snout to dorsal-fin origin 42.31 40.38 43.83 Snout to pectoral-fin origin 55.15 53.11 57.10 Snout to pelvic-fin origin Caudal peduncle depth 13.15 12.00 14.82 Snout to anal-fin origin 11.71 11.10 12.18 23.35 22.50 24.57 Caudal peduncle length 14.03 13.75 14.55 Pectoral-fin length 15.81 14.78 17.10 Pelvic-fin length 20.13 19.30 21.84 Dorsal-fin base length 36.95 35.29 38.41 Dorsal-fin height Figure 2. Mimagoniates inequalis 17.72 16.65 18.39 Anal-fin base length 44.61 43.11 46.27 , distribution of caudal scales in male; Anal-fin lobe length note the curvature of the caudal-fin rays 11-12. 24.63 23.32 26.69 Dorsal-fin/caudal-fin base is unbranched. Percentage of HL Bony head length pelvic fin i,6-7; when seven rays are present, the last one Eye diameter 37.70 36.01 39.70 21.44 19.90 22.96 The largest male has one pair of hooks per ray in the last Least interorbital width 37.43 33.85 41.80 Snout length unbranched and first six branched anal-fin rays, excluded 45.98 44.93 47.77 the first branched ray which has two pairs of hooks. The squamation of the caudal fin is slightly modified compared Upper jaw length Mwith. inequalis other species; the caudal-fin rays 11 and 12 are somewhatcurved dorsally rounded (Figure humeral 2). Thespot pigmentationis present in both pattern sexes, of las Palmas (34°16’05” S, 58°43’16” W). The dead end of also a slender does black not stripe possess extends striking from features.posterior Aportion black, the channel has been enlarged by local neighbors in order of head to the end of caudal peduncle and a slender mid- mixto turn of juvenilearound theircharaciforms, boats there, all belowforming 20 now mm, a smallof several bay, where wind and current gather leafs and driftwood. A black, distal band, and many chromatophores bound the dorsal black stripe is present; in males, the anal fin has a monthsspecies in was , caught betweenanimals from these this drifting locality structures could be with a square net. Only afterM. growing inequalis for and a couple six were of upper and lowermost caudal-fin rays. Males in aquarium preserved for determination. have the dorsum of the body greenish or faint yellowish identified alive tentatively as to(Figure M. inequalis 3). was collected by the authors in the lower Material examined: A group of juveniles, then unrecognized, belonging 25.56Asociación mm SL. Ictiológica, La Plata, AI 304, 3 ex., 27.49-33.32 a southern side channel of the río Paraná de las Palmas, mm SL; Fundación Miguel Lillo, CI-FML 5309, 3 ex., 29.37- thebasin Southern of the ríobranch Paraná. of the The Paraná collection river in site its (Figuredelta, on 4) the is The same site was fished again Astyanaxone year later sp., andCharax both catches together give a basic idea of the ichthyofaunal road from the city of Escobar to the village of Paraná de composition of this :

Figure 3. Mimagoniates inequalis

, male from the new locality in aquarium (not preserved) 785 Azpelicueta and Koerber | Mimagoniates inequalis in Argentina stenopterus, Cnesterodon decemmaculatus, Cynopotamus Acknowledgments: The authors thank Osvaldo Fernandez Santos, argenteus, Hisonotus sp., Hoplias malabaricus, Mylossoma duriventre, Oligosarcus sp., Rineloricaria sp., Salminus Pedro Heinonen and Claudio Schilling for their help in the field. Sascha brasiliensis, Sorubim lima Astyanax sp., Thamm helped us with his extraordinary skills and advice in growing up Cheirodon interruptus, Cnesterodon decemmaculatus, and curing from parasites of juvenile wild specimens. Thanks are due to LiteratureWikipedia for Cited making the satellite image available to the public. Leporinus obtusidens, Phalloceros (26Nov2009); caudimaculatus , Pimelodus sp., Prochilodus lineatus, Rineloricaria sp., Biogeographica Salminus brasiliensis Azpelicueta, M.M. and G. García. 2001. The fauna of a reserve of biosphere, the “Humedales del Este”, in Uruguay. Characidae,77(1): 1-13. , Mimagoniates barberi (29Nov2010). Mantinian, J.E. and A.M. Miquelarena. 2010.Check List Pisces, Characiformes, 1990. Two new species of Mimagoniates Regan, 1907: First Argentinean distribution record. 6(3): 416-418. Menezes, N.A. and S.H. Weitzman. (Teleostei: Proceedings Characidae: of the Glandulocaudinae), Biological Society of their Washington phylogeny and 380-426.biogeography and a key to the glandulocaudin of Brazil and Paraguay. 103(2):

Menezes, N.A. andNeotropical S.H. Weitzman. Ichthyology 2009. Systematics of the Neotropical fish subfamily Glandulocaudinae (Teleostei: Characiformes: Characidae). 7(3): 295-370. Menezes, N.A., A.C. Ribeiro, S.H. Weitzman and R.A. Torres. 2008. Biogeography of GlandulocaudinaeZootaxa (Teleostei: Characiformes: Characidae) revisited: phylogenetic patterns, historical geology and genetic connectivity. 1726: 33-48.

Figure 4. First collection site of Mimagoniates inequalis Received: March 2012 Accepted: June 2012 in Argentina: Published online: August 2012 channel in the Tigre delta, looking westward. Editorial responsibility: Sergio Maia Queiroz Lima

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