Palaemon ivonicus (Holthuis, 1950)

Carvalho, Fabricio Lopes, Magalhaes, Celio & Mantelatto, Fernando Luis, 2014, Molecular and morphological differentiation between two Miocene-divergent lineages of Amazonian shrimps, with the description of a new species (Decapoda, Palaemonidae, Palaemon), ZooKeys 457, pp. 79-108 : 86-88

Taxon classification Animalia Decapoda Palaemonidae

Palaemon ivonicus (Holthuis, 1950) Figures 5band 6b

Palaemonetes ivonicus Holthuis, 1950a: 98;- Holthuis 1966: 4, fig. 1;- Rodríguez 1981: 47 [in list];- Coelho and Ramos-Porto 1985: 408 [in table];- Ramos-Porto and Coelho 1990: 99 [part, not Rio Negro, Catagalo];- Kochalka et al. 1996: 113 [in list];- Ramos-Porto and Coelho 1998: 337 [in list]; Magalhães 1999: 36, 85 [in list];- Magalhães 2000: 59 [in list];- Magalhães 2001: 70, 133 [in list];- Magalhães 2002: 1096, figs 5, 6;- García-Dávila and Magalhães 2003: 675, figs 21-27, 55;- Magalhães and Pereira 2007: 9, 10, 12 [in list];- Valencia and Campos 2010: 224, figs 3 –4;– Pileggi et al. 2013: 570.

Palaemonetes carteri - Holthuis 1966: 6 [part,? 2 spec. from Lago Redondo];- Magalhães 2005: 69, 71 [in list]; Pileggi et al. 2013: 569 [? part, material from rio Xingu and rio Trombetas].

Palaemonetes (Palaemonetes) ivonicus - Holthuis 1950c: 10 [in list];- Holthuis 1952: 222, pl. 53, figs d–h;– Melo 2003: 382.

Palaemonetes (Palaemonetes) carteri - Kensley and Walker 1982: 11 [part.,? spec. from Rio Madeira].

Holotype.

Bolivia, Beni, Ivon, Beni River, ♀ (CL 7.5 mm), col. WM Mann, February 1922 (USNM 85234).

Paratype.

same data as holotype, 1♀ (CL 6.6 mm) (USNM 85234).

Other material.

Brazil.Acre. Bujari, igarapé Mapinguari, 2♂ 18♀, col. LR Malabarba et al., 8 August 2001 (UFRGS 3179). Amazonas. Itacoatiara, canal Irandiba, 3♂, col. GY Hattori, April 2008 (CCDB 2753); Itacoatiara, igarapé Aeroporto, 2♂ 18♀ (CCDB 4725); Itacoatiara, Poranga, 7♂ 23♀ (CCDB 4632); Itacoatiara, 3♂ 15♀ (CCDB 4716); rio Madeira, Borba, 1♂ 9♀ (MNRJ 1078); rio Solimões, igarapé do Xiboreno, 1♂ 1♀, col. FL Carvalho and EA Souza-Carvalho, 28 January 2012 (CCDB 1435); rio Solimões, lago Janauacá, 1♀, col. J Donnath, 18 March 1978 (MZUSP 8183); rio Solimões, lago do Jacaré, 2♀, col. H Reichardt, 29 March 1967 (MZUSP 6405); Tefé, igarapé da Aeronáutica, 12♂ 8♀, col. JO Chaves, 21 March 1979 (INPA 128). Pará. Almeirim, rio Arraiolos, pesqueiro São Paulo, 7♂ 5♀, col. J Carvalho Júnior, 26 July 1999 (MPEG 689); Altamira, rio Xingu, 4♀, col. RM Sousa and Dionísio, 18 December 2000 (MPEG 715); Porto de Moz, rio Xingu, 1♂ 1♀ov, col. R Robles et al., 25 September 2013 (CCDB 4867); rio Tapajós, near the rio Cupari’s mouth, downstream Itaiatuba, 1♀, col. C Magalhães and LH Py-Daniel, 27 October 1991 (INPA 1176); Santarém, igarapé do Juá, 2♀, col. LM Sousa and JL Birindelli, 13 November 2006 (MZUSP 28358). Rondônia. Rio Guaporé, 1♂ 2♀, col. JC Malta, 25 September 1985 (INPA 326). Mato Grosso. Acorizal, 17♂ 6♀, col. Sebastiana, 28 August 1987 (MNRJ 1151); Acorizal, 9♂ 5♀ 4 juveniles, col. Sebastiana (MNRJ 1153); baía do Pio, Pantanal, 5♂ 15 juveniles, col. Sebastiana (MNRJ 1152); Poconé, baía do Pio, 14♂ 33♀ 19 juveniles (INPA 328). Mato Grosso do Sul. Rio Negro, córrego Anhumas, 9♂ 11♀, col. C Magalhães et al., 28 August 1998 (CCDB 4667). Peru.Loreto. Lago Urcococha, rio Amazonas, 10♂ 5♀, col. C García-Dávila, 10 January 1999 (INPA 883); Quistococha, río Itaya, 12♂ 7♀ov, col. C García-Dávila, 13 July 1998 (INPA 882).

Diagnosis.

Mandibular palp absent. Rostrum high, straight or slightly curved upward, not overreaching the scaphocerite; dorsal margin with 6 to 10 teeth; ventral margin with 1 to 4 teeth, usually 3 or fewer. Projection of the anterolateral margin of the first antennular segment reaching or overreaching the dorsal distal margin of the second segment; anterolateral spine of the first antennular segment almost reaching or overreaching the first third of the projection of the anterolateral margin. Appendix masculina up to 1.5 the length of the appendix interna, measured from their junction. Telson carrying 2 plumose setae between the inner distal stout setae; inner distal stout setae overreaching the distal tip of the telson.

Geographic distribution.

Venezuela? (Delta Amacuro, Monagas), Colombia? (Amazonas, Arauca, Casanare, Guainía, Meta, Vichada), Brazil (Acre, Amazonas, Mato Grosso, Mato Grosso do Sul, Pará), Bolívia (Beni, Cochabamba, Pando), Peru (Loreto, Madre de Díos), Paraguay.

Ecological features.

Usually associated with riparian vegetation, leaf litter and similar microhabitats in lakes, streams and rivers with white or clear water, in areas with low flow. In the western portion of the Amazon river basin it is commonly found in the floodplains of the white water river systems.