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Research Article
An inventory of coastal freshwater fishes from Amapá highlighting the occurrence of eight new records for Brazil
expand article infoBruno F. Melo, Ricardo C. Benine, Ricardo Britzke§, Cecile S. Gama|, Claudio Oliveira
‡ Universidade Estadual Paulista, Botucatu, Brazil
§ IB-UNESP, Botucatu, Brazil
| Instituto de Pesquisas Científicas e Tecnológicas do Amapá, Macapá, Brazil
¶ Universidade Estadual Paulista (UNESP), Botucatu, São Paulo, Brazil
Open Access

Abstract

The Amazon Basin occupies a vast portion of northern South America and contains some of the highest species richness in the world. The northern Brazilian state of Amapá is delimited by the Amazonas River to the south, the Oyapock River to the northern boundary with French Guyana, and the Atlantic northeastern coast to Amazon estuary. Despite several expeditions to the Amazon in recent decades, little is known about the freshwater ichthyofauna from Amapá, with records limited to local inventories and species descriptions. This paper presents a compilation of the freshwater fish diversity sampled in fifteen sites covering two major Amapá ecoregions during the dry season of 2015. 120 species representing eight orders and 40 families are reported upon in this work. Eight species appear for the first time in the Brazilian territory providing new information for future conservation status evaluations.

Keywords

Amazon, French Guyana, Neotropical, South America, Teleostei

Introduction

At the northern limit of Brazil, the state of Amapá occupies the lower portion of the Amazon River basin at the border between Brazil, French Guyana, and Suriname. With more than 14 million hectares, ca. 90% of its native surface is still intact and ca. 73% is legally protected as either federal/state conservation units or indigenous territories (Bernard 2008). As example, the Tumucumaque National Park is the largest Brazilian protected unit and the largest continuous tropical forest national park in the world (Bernard 2008). Consequently, Amapá harbors a striking portion of the Neotropical fauna and flora in the Guiana Shield. That region along with the adjacent coastal ecosystems certainly needs further biological research.

Amapá includes three major Neotropical freshwater ecoregions (sensu Abell et al. 2008). The first is the Guianas containing the Oyapock River that has its headwaters in the Tumucumaque National Park. The second is the Amazonas Guiana Shield containing the Rio Jari and Rio Iratapuru, and the upper portions of the Rio Araguari basin including the large Rio Amapari. Third ecoregion is the Amazonas Estuary and Coastal Drainages that contains small rivers reaching the lower Amazonas such as Rio Cajari and Rio Preto as well as several independent coastal rivers reaching the east coast, including the middle/lower Rio Araguari, Rio Flexal, Rio Amapá Grande and its associated lakes, Rio Calçoene, Rio Cunani, Rio Cassiporé and Rio Uaçá (Fig. 1) (Jégu and Keith 1999).

Figure 1.

Map of Amapá in northern Brazil, lower Amazon basin showing each collecting site (black circles). Numbers match those in Table 1.

Sampled localities in the Amapá and their placement in Figure 1.

Site Locality Major drainage Municipality Coordinates Ecoregion
1 Rio Preto Rio Amazonas Mazagão 00°00'34.6"S 51°40'11.3"W Amazonas Estuary and Coastal Drainages
2 Igarapé do Bispo Rio Amazonas Mazagão 00°01'45.5"N 51°38'05.6"W Amazonas Estuary and Coastal Drainages
3 Unnamed lagoon Rio Amazonas Mazagão 00°05'11.3"N 51°37'58.1"W Amazonas Estuary and Coastal Drainages
4 Unnamed stream Rio Araguari Ferreira Gomes 00°50'44.7"N 51°10'15.7"W Amazonas Estuary and Coastal Drainages
5 Lago Pracuúba Rio Amapá Pracuúba 01°44'49.8"N 50°46'59.3"W Amazonas Estuary and Coastal Drainages
6 Igarapé Balneário St. Bárbara Rio Amapá Amapá 02°03'42.8"N 50°54'15.1"W Amazonas Estuary and Coastal Drainages
7 Igarapé Balneário Raso Rio Amapá Amapá 02°05'25.6"N 50°53'19.8"W Amazonas Estuary and Coastal Drainages
8 Igarapé Pau Pintado Rio Calçoene Calçoene 02°28'47.7"N 50°58'47.2"W Amazonas Estuary and Coastal Drainages
9 Igarapé Asa Aberta Rio Calçoene Calçoene 02°31'08.9"N 51°00'52.9"W Amazonas Estuary and Coastal Drainages
10 Igarapé Faz. Campo Alegre Rio Cassiporé Oiapoque 03°04'49.7"N 51°28'50.7"W Amazonas Estuary and Coastal Drainages
11 Igarapé do Quatorze Oyapock River Oiapoque 03°45'10.4"N 51°46'57.3"W Guianas
12 Rio Pantanari Oyapock River Oiapoque 03°48'47.6"N 51°48'31.6"W Guianas
13 Igarapé Cortiço Oyapock River Oiapoque 03°49'05.5"N 51°47'21.4"W Guianas
14 Lagoa Mr. Rona Oyapock River Oiapoque 03°50'31.5"N 51°50'28.7"W Guianas
15 Oyapock River Oyapock River Oiapoque 03°50'33.5"N 51°50'25.7"W Guianas

Checklists of freshwater fishes have been continually published for French Guyana (Planquette et al. 1996; Keith et al. 2000; Le Bail et al. 2000, 2012), Suriname (Mol et al. 2012) and the Guiana Shield in general (Vari et al. 2009; Sidlauskas and Vari 2012). Likewise, biogeographic questions have been addressed to that region (Jégu and Keith 1999; Lujan and Armbruster 2011) as well as species descriptions (e.g. Jégu and Santos 1990; Vari 1992; Zarske and Géry 1998; Lucena and Gama 2007; Ottoni et. al. 2012). However, the diversity and composition of freshwater fishes from the Amapá and consequently the eastern limit of the Guiana Shield are limited to a concise and well-sampled inventory of fishes from the Tumucumaque National Park (Gama 2008) that is situated in the Amazonas Guiana Shield ecoregion (upper Oyapock River). Our aim is to present a survey of the ichthyofauna from Amapá sampled in the other two ecoregions: the Guianas (lower Oyapock River) and the Amazonas Estuary and Coastal Drainages. New records of freshwater fishes for Brazil should contribute to our understanding of the Neotropical ichthyofauna as well as to future evaluations of their conservation status.

Material and methods

Fifteen sites were sampled including small streams, river channels and large/lentic lagoons covering two ecoregions from Abell et al. (2008): Guianas (lower Oyapock River) and Amazonas Estuary and Coastal Drainages (Table 1; Fig. 1). Collection sites (Fig. 2) cover variable environments including small streams, rivers and lagoons and are near the main state road BR-156, which connects Laranjal do Jari to Oiapoque municipalities. Mazagão, Ferreira Gomes, Tartarugalzinho, Amapá and Calçoene are the intervening cities. Sampling efforts occurred during dry season in September and late November/early December 2015, mostly during daylight. Specimen collection involved tows of dipnets along the vegetated margins, a 5-meter bottom trawl and cast-netting in large streams or lagoons. Collection in the Lago Pracuúba comprised gillnets blocking fish passage overnight.

Figure 2.

Sampled localities in the Amapá, northern Brazil. Numbers follow Table 1 and Fig. 1. Photographs by B.F. Melo and C. Oliveira. Photo 2 credits: Alan Kardec available at Google Earth.

Specimens were anesthetized in a solution of clove oil, preserved in 96% ethanol (for molecular studies) or fixed in 10% formalin solution (for morphological studies) and then preserved in 70% ethanol. Muscle tissues were collected and preserved in 96% ethanol. Vouchers are deposited in the Laboratório de Biologia e Genética de Peixes at the Universidade Estadual Paulista, Botucatu, São Paulo, Brazil (LBP). Expeditions had permission to collect wild species in Brazil under ICMBio license number 13.843-1 to Claudio Oliveira. Species identifications to the lowest taxonomic level were conducted consulting the taxonomic literature and identification keys (Géry 1977; Planquette et al. 1996; Keith et al. 2000; Le Bail et al. 2000; Lucena and Malabarba 2010; Sidlauskas and Vari 2012; Peixoto et al. 2015) and updated with Eschmeyer et al. (2016). Classification follows the current phylogenetic arrangement of bony fishes (Betancur-R et al. 2014). We used checklists (Reis et al. 2003; Le Bail et al. 2012), SpeciesLink (http://www.splink.org.br/) and FishNet2 (http://www.fishnet2.net/) to search previous records of the species listed herein.

Results and discussion

The fish survey in the freshwater rivers of Amapá resulted in 120 species representing eight orders and 40 fish families that range from obligate freshwater to marine organisms (Table 2). Orders comprising the highest percentage of species richness were Characiformes (55%), Cichliformes (16.6%), Siluriformes (14.1%) and Gymnotiformes (7.5%) as expected in Neotropical freshwaters (e.g. Langeani et al. 2007; Vari et al. 2009; Polaz et al. 2014). These four orders represent 93.3% of the total species richness. Clupeiformes (Anchovia), Cyprinodontiformes (Fluviphylax and Melanorivulus), Gobiiformes (Dormitator), Beloniformes (Potamorrhaphis), Sciaenidae (Micropogonias) and Polycentridae (Monocirrhus and Polycentrus) complete the list with one or two species each. The most highly represented family was Characidae (25% of total species), followed by Cichlidae (16.6%) and Loricariidae (6.6%). Previous fish survey from Tumucumaque National Park listed 207 species from five expeditions (Gama 2008) and found a new species record in the Brazilian territory, the cichlid Cleithracara maronii. It is noteworthy, however, that some species are common in both lists despite sampling distinct ecoregions (e.g. Ageneiosus inermis, Apistogramma gossei, Bryconops caudomaculatus, Leporinus gossei, Microsternarchus bilineatus).

List of freshwater fish species collected in the state of Amapá, northern Brazil.

CLASS/ORDER/FAMILY/SPECIES
CLASS ACTINOPTERYGII
CLUPEIFORMES
Engraulidae
Anchovia aff. surinamensis (Bleeker, 1866) LBP 20632
CHARACIFORMES
Curimatidae
Curimata cyprinoides (Linnaeus, 1766) LBP 20629, LBP 20634, LBP 20645
Curimatopsis sp. LBP 20480, LBP 21011, LBP 21031, LBP 21052, LBP 21079, LBP 21113, LBP 21191, LBP 21212, LBP 21240
Cyphocharax gouldingi Vari, 1992 LBP 21032, LBP 21078, LBP 21133, LBP 21189, LBP 21211
Cyphocharax helleri (Steindachner, 1910) LBP 21140
Anostomidae
Leporinus friderici (Bloch, 1794) LBP 20633
Leporinus gossei Géry, Planquette & Le Bail, 1991 LBP 20626, LBP 21114
Leporinus nijsseni Garavello, 1990 LBP 21163
Leporinus parae Eigenmann, 1908 LBP 20653
Schizodon fasciatus Spix & Agassiz, 1829 LBP 20656
Chilodontidae
Chilodus zunevei Puyo, 1946 LBP 21129, LBP 21137, LBP 21177
Crenuchidae
Characidium zebra Eigenmann, 1909 LBP 21016, LBP 21033, LBP 21051, LBP 21082, LBP 21149, LBP 21161, LBP 21195, LBP 21210
Crenuchus spilurus Günther, 1863 LBP 21107, LBP 21237
Melanocharacidium cf. blennioides (Eigenmann, 1909) LBP 21185
Melanocharacidium dispilomma Buckup, 1993 LBP 21160
Microcharacidium eleotrioides (Géry, 1960) LBP 21159, LBP 21190
Hemiodontidae
Hemiodus gracilis Günther, 1864 LBP 21186
Hemiodus quadrimaculatus Pellegrin, 1908 LBP 21151
Characidae
Astyanax bimaculatus (Linnaeus, 1758) LBP 20637, LBP 21004, LBP 21008, LBP 21080, LBP 21125, LBP 21167, LBP 21234
Astyanax sp. LBP 21005, LBP 21024, LBP 21026
Bryconamericus sp. LBP 21171
Charax niger Lucena, 1989 LBP 21086, LBP 21217
Hemigrammus boesemani Géry, 1959 LBP 20484, LBP 20983, LBP 21099, LBP 21112, LBP 21128, LBP 21200, LBP 21225, LBP 21250, LBP 21589
Hemigrammus levis Durbin, 1908 LBP 20983, LBP 21006, LBP 21027, LBP 21043, LBP 21222
Hemigrammus ocellifer (Steindachner, 1882) LBP 21069, LBP 21100, LBP 21244
Hemigrammus rodwayi Durbin, 1909 LBP 21226
Hemigrammus cf. schmardae (Steindachner, 1882) LBP 21022, LBP 21045, LBP 21201, LBP 21224, LBP 21246
Hemigrammus unilineatus (Gill, 1858) LBP 21094
Hemigrammus sp. LBP 21001, LBP 21025, LBP 21046, LBP 21047, LBP 21068, LBP 21071, LBP 21227
Hyphessobrycon copelandi Durbin, 1908 LBP 21036, LBP 21064, LBP 21103, LBP 21138, LBP 21241
Hyphessobrycon sp. LBP 20483, LBP 21002, LBP 21003, LBP 21101, LBP 21196, LBP 21199, LBP 21221
Jupiaba abramoides (Eigenmann, 1909) LBP 21095
Jupiaba keithi (Géry, Planquette & Le Bail, 1996) LBP 21122, LBP 21169
Jupiaba meunieri (Géry, Planquette & Le Bail, 1996) LBP 21007
Jupiaba ocellata (Géry, Planquette & Le Bail, 1996) LBP 21088
Jupiaba sp. LBP 21247
Moenkhausia chrysargyrea (Günther, 1864) LBP 21070, LBP 21097, LBP 21121, LBP 21146
Moenkhausia collettii (Steindachner, 1882) LBP 21010, LBP 21044, LBP 21066, LBP 21096, LBP 21198, LBP 21223, LBP 21248
Moenkhausia georgiae Géry, 1965 LBP 21093
Moenkhausia gracilima (Eigenmann, 1908) LBP 21243
Moenkhausia lepidura (Kner, 1858) LBP 21085, LBP 21145
Moenkhausia oligolepis (Günther, 1864) LBP 21077, LBP 21124, LBP 21139
Moenkhausia surinamensis Géry, 1965 LBP 21009, LBP 21102, LBP 21245
Moenkhausia sp. LBP 21098, LBP 21249
Odontostilbe gracilis (Géry, 1960) LBP 21228
Phenacogaster wayana Le Bail & Lucena, 2010 LBP 21218
Poptella brevispina Reis, 1989 LBP 21014, LBP 21056, LBP 21104, LBP 21127, LBP 21141, LBP 21168, LBP 21194, LBP 21220
Pristella maxillaris (Ulrey, 1894) LBP 21037
Acestrorhynchidae
Acestrorhynchus falcatus (Bloch, 1794) LBP 21173
Acestrorhynchus microlepis (Schomburgk, 1841) LBP 21142
Erythrinidae
Hoplerythrinus unitaeniatus (Agassiz, 1829) LBP 21209
Hoplias malabaricus (Bloch, 1794) LBP 21084, LBP 21110, LBP 21115, LBP 21175, LBP 21233
Lebiasinidae
Copella aff. arnoldi (Regan, 1912) LBP 20982
Copella carsevennensis (Regan, 1912) LBP 21111, LBP 21131, LBP 21148, LBP 21162
Nannostomus beckfordi Günther, 1872 LBP 20477, LBP 20478, LBP 20981, LBP 21023, LBP 21034, LBP 21055, LBP 21091, LBP 21192, LBP 21216, LBP 21238
Nannostomus bifasciatus Hoedeman, 1954 LBP 21590
Pyrrhulina filamentosa Valenciennes, 1847 LBP 21015, LBP 21030, LBP 21054, LBP 21083, LBP 21193, LBP 21215, LBP 21239
Iguanodectidae
Bryconops affinis (Günther, 1864) LBP 21050, LBP 21132
Bryconops caudomaculatus (Günther, 1864) LBP 20979, LBP 21089, LBP 21178, LBP 21219, LBP 21242
Bryconops melanurus (Bloch, 1794) LBP 21143, LBP 21170
Bryconops sp. LBP 20998, LBP 21013, LBP 21035
Serrasalmidae
Acnodon oligacanthus (Müller & Troschel, 1844) LBP 21012
Metynnis lippincottianus (Cope, 1870) LBP 20647, LBP 20648, LBP 20999, LBP 21057, LBP 21172, LBP 21213
Mylesinus paraschomburgkii Jégu, Santos & Ferreira, 1989 LBP 20628
Myleus ternetzi (Norman, 1929) LBP 20980, LBP 21144
Pygocentrus nattereri Kner, 1858 LBP 20651
Serrasalmus humeralis Valenciennes, 1850 LBP 20649, LBP 20650, LBP 20652, LBP 21187, LBP 21188, LBP 21214
SILURIFORMES
Aspredinidae
Bunocephalus sp. LBP 21029
Callichthyidae
Megalechis thoracata (Valenciennes, 1840) LBP 21076
Loricariidae
Ancistrus sp. LBP 21147, LBP 21164
Curculionichthys sp. LBP 21166
Farlowella reticulata Boeseman, 1971 LBP 21208, LBP 21230
Guyanancistrus brevispinis (Heitmans, Nijssen & Isbrücker, 1983) LBP 21165, LBP 21183
Hypostomus plecostomus (Linnaeus, 1758) LBP 20644
Hypostomus ventromaculatus Boeseman, 1968 LBP 20635
Lithoxus sp. LBP 21184
Loricaria cataphracta Linnaeus, 1758 LBP 20636
Heptapteridae
Heptapterus bleekeri Boeseman, 1953 LBP 21181
Rhamdia quelen (Quoy & Gaimard, 1824) LBP 21072
Pimelodidae
Brachyplatystoma filamentosum (Lichtenstein, 1819) LBP 20630
Hypophthalmus edentatus Spix & Agassiz, 1829 LBP 20654
Pimelodus sp. LBP 20627
Auchenipteridae
Ageneiosus inermis (Linnaeus, 1766) LBP 20655
Trachelyopterus coriaceus Valenciennes, 1840 LBP 20988
GYMNOTIFORMES
Gymnotidae
Gymnotus gr. anguillaris Hoedeman, 1962 LBP 21081, LBP 21156
Sternopygidae
Eigenmannia antonioi Peixoto, Dutra & Wosiacki, 2015 LBP 21117, LBP 21182
Eigenmannia waiwai Peixoto, Dutra & Wosiacki, 2015 LBP 21118, LBP 21155
Steatogenys elegans (Steindachner, 1880) LBP 20997
Apteronotidae
Apteronotus bonapartii (Castelnau, 1855) LBP 21591
Ramphichthyidae
Gymnorhamphichthys rondoni (Miranda Ribeiro, 1920) LBP 21232
Rhamphichthys rostratus (Linnaeus, 1766) LBP 21120, LBP 21154
Hypopomidae
Brachyhypopomus pinnicaudatus (Hopkins, 1991) LBP 21130
Microsternarchus bilineatus Fernández-Yépez, 1968 LBP 20996, LBP 21053, LBP 21235
GOBIIFORMES
Gobiidae
Dormitator maculatus (Bloch, 1792) LBP 21090
SUBSERIES OVALENTARIAE
Polycentridae
Polycentrus schomburgkii Müller & Troschell, 1849 LBP 21039, LBP 21109
Monocirrhus polyacanthus Heckel, 1840 LBP 20989, LBP 21028, LBP 21202
CICHLIFORMES
Cichlidae
Acaronia nassa (Heckel, 1840) LBP 20985, LBP 21048
Aequidens gr. tetramerus (Heckel, 1840) LBP 20994, LBP 21136, LBP 21231
Apistogramma agassizii (Steindachner, 1875) LBP 20479
Apistogramma gossei Kullander, 1982 LBP 20993, LBP 21040, LBP 21062, LBP 21092, LBP 21236
Apistogramma sp. ‘Amapá’ LBP 21157
Cichla monoculus Spix & Agassiz, 1831 LBP 20625
Cichla sp. LBP 21180, LBP 21205
Crenicichla cf. multispinosa Pellegrin, 1903 LBP 20991, LBP 21158
Crenicichla saxatilis (Linnaeus, 1758) LBP 21038, LBP 21073, LBP 21207
Geophagus surinamensis (Bloch, 1791) LBP 20638, LBP 20986, LBP 21074
Guianacara geayi (Pellegrin, 1902) LBP 21116, LBP 21152
Heros cf. efasciatus Heckel, 1840 LBP 20646, LBP 20995, LBP 21042
Hypselecara temporalis (Günther, 1862) LBP 21061, LBP 21067, LBP 21075, LBP 21135
Krobia aff. guianensis (Regan, 1905) LBP 21017, LBP 21063, LBP 21108, LBP 21123, LBP 21153, LBP 21179, LBP 21203
Laetacara flamannellus Ottoni, Bragança, Amorim & Gama, 2012 LBP 21049
Mesonauta guyanae Schindler, 1998 LBP 20992, LBP 21018, LBP 21041, LBP 21059, LBP 21087, LBP 21119, LBP 21176, LBP 21204
Nannacara aureocephalus Allgayer, 1983 LBP 21065, LBP 21126
Retroculus septentrionalis Gosse, 1971 LBP 21019
Satanoperca jurupari (Heckel, 1840) LBP 21058, LBP 21174
Satanoperca rhynchitis Kullander, 2012 LBP 21020
CYPRINODONTIFORMES
Rivulidae
Melanorivulus schuncki (Costa & De Luca, 2011) LBP 20427, LBP 20987, LBP 21134, LBP 21197, LBP 21229, LBP 21251
Poeciliidae
Fluviphylax palikur Costa & Le Bail, 1999 LBP 20481, LBP 20984, LBP 21021
BELONIFORMES
Belonidae
Potamorrhaphis guianensis (Jardine, 1843) LBP 20990, LBP 21060, LBP 21206
SERIES PERCOMORPHARIA
Sciaenidae
Micropogonias furnieri (Desmarest, 1823) LBP 20631

Eight species were identified from Brazilian territory previously thought to inhabit only the Guianas region. Herein, these species are formally recorded for Brazil and are Leporinus gossei, Chilodus zunevei, Melanocharacidium cf. blennioides, Jupiaba keithi, Phenacogaster wayana, Odontostilbe gracilis, Acnodon oligacanthus and Nannacara aureocephalus (Fig. 3). Among them, L. gossei, C. zunevei and N. aureocephalus were recently reported to Oyapock River in the Brazil-French Guyana boundary (Le Bail et al. 2012). Leporinus gossei was described from Marowijne river (Géry et al. 1991) and subsequently reported to many rivers of French Guyana (Planquette et al. 1996; Sidlauskas and Vari 2012) including the Brazilian section of the Oyapock River reported herein. Chilodus zunevei is recorded for the northeastern Suriname along the coastal rivers of French Guyana to Oyapock (Sidlauskas and Vari 2012) and now in the Rio Amapá. Melanocharacidium blenioides was described from the Potaro River in Guyana and ranges from Guyana to French Guyana (Buckup 2003). Herein, we report the species to the Rio Amapá. Jupiaba keithi is recorded from the Marowijne and Mana rivers of French Guyana (Zanata 1997); we found J. keithi in the Oyapock River. The recently described Phenacogaster wayana from Corantijn to Approuague rivers (Lucena and Malabarba 2010) is formally reported to Rio Amapá in Brazil. Odontostilbe gracilis occurs in a few places of the French Guyana (Planquette et al. 1996); we collected only a single specimen in the Rio Amapá. Acnodon oligacanthus is known only from the Guianas (Jégu 2003) and we found several specimens in the Rio Calçoene. Finally, Nannacara aureocephalus occurs in the Approuague river in French Guyana (Kullander 2003) and we found nine specimens in the Oyapock River. These new records should be incorporated in future evaluations of Brazilian threatened species conducted by the Ministério do Meio Ambiente/IUCN.

Figure 3.

Species reported for the first time in Brazil. a Leporinus gossei, LBP 21114, Oyapock River b Chilodus zunevei, LBP 21129, Oyapock River c Melanocharacidium cf. blennioides, LBP 21185, Rio Amapá d Jupiaba keithi, LBP 21122, Oyapock River e Phenacogaster wayana, LBP 21218, Rio Amapá f Odontostilbe gracilis, LBP 21228, Rio Amapá g Acnodon oligacanthus, LBP 21012, Rio Calçoene h Nannacara aureocephalus, LBP 21065, Oyapock River. Scale bars: 1 cm.

The following species are known to occur in Brazil but are now first reported for coastal rivers of Amapá. Leporinus parae occurs in the lower Amazon basin, state of Pará, Brazil as well as in the Orinoco basin in Venezuela (Britski and Birindelli 2008). We collected L. parae in the Lago Pracuúba, an oxbow lake adjacent to the Rio Amapá Grande, leading to the first formal record of the species to Amapá. Jupiaba abramoides was previously known from the Rio Negro and we have now extended its range to the Oyapock River. Specimens of Curculionichthys, small armored catfishes distributed mostly throughout La Plata, São Francisco, Tapajós and Xingu basins (Roxo et al. 2015) were found in the Rio Cassiporé and Rio Jari and represent an undescribed species.

Besides Curculionichthys, three other taxa represent putative undescribed species: Curimatopsis sp., a member of the cryptic lineage Curimatopsis aff. crypticus (Melo et al. 2016), Lithoxus sp. from Rio Amapá and Apistogramma sp. ‘Amapá’ from the Oyapock River, commonly misidentified as A. gossei. These specimens are subject of ongoing taxonomic investigation in our laboratory. Furthermore, some taxa could only be identified at genus level, such as Astyanax sp., Bryconops sp., Bryconamericus sp., Bunocephalus sp., Hemigrammus sp., Hyphessobrycon sp., Pimelodus sp., among others (Table 2), and additional studies will be necessary to further classify these specimens. Overall, our survey increases our knowledge on the freshwater ichthyofauna of Amapá and of northern Brazil and provides new information for future conservation status evaluation. However, as other regions of the state remain unexplored, future inventories will likely reveal additional fish species in that part of the Guiana Shield.

Acknowledgments

We thank the Instituto de Pesquisas Científicas e Tecnológicas do Estado do Amapá (IEPA) for local assistance in the field expeditions. Thanks to Brandon T. Waltz, Francisco Langeani, Gabriel S.C. Silva, José L.O. Birindelli, Marina V. Loeb, Maxwell J. Bernt, Nadayca T.B. Mateussi, and Victor A. Tagliacollo for helping on the identifications, and to Benjamin W. Frable for English review and valuable suggestions on the manuscript. We also thank Javier Maldonado, Francisco Langeani and an anonymous reviewer for improving the manuscript. Authors received support from FAPESP grants 2014/26508-3 (BFM and CO), 2011/00269-4 (RB) and CNPq PDJ 40258/2014-7 (BFM).

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