Acanthocephalus tumescens

(syn. Echinorynchus tumescens Linstow, 1896)

Actinopterygii

Aplochiton zebra Jenyns ( Osmeriformes, Galaxiidae). SI: intestine. SD: adult. L: Chubut Province: Puelo Lake, Epuyén Lake, Cholila Lake and Rivadavia Lake. R: Fernandez et al. (2012). C: vouchers (MACN-Pa 530/1– 2).

Galaxias maculatus (Jenyns) ( Osmeriformes, Galaxiidae). SI: intestine. SD: adult. L: Neuquén Province: Pulmarí Lake (39º08’S– 71º05’S), Ñorquinco Lake (39º09’S– 71º17’S), Carilafquén Lake (39º49’S– 71º39’S), Currhué Chico Lake (39º54’S– 71º20’S), Meliquina Lake (40º23’S– 71º17’S), Espejo Chico Lake (40º35’S– 71º44’S), Espejo Lake (40º41’S– 71º40’S), Correntoso Lake (40º44’S– 71º39’S), Nahuel Huapi Lake (41º04’S, 71º25’W– 41º06’S, 71º40’W); Río Negro Province: Gutiérrez Lake (41º05’S, 71º25’W), Morenito Lake (41º05’S– 71º31’S), Mallín Ingeniero Lake (41º15’S– 71º40’S), Mascardi Lake (41º17’S, 71º34’W), Moreno Lake (41º18’S, 71º42’W), Los Césares Lake (41º19’S– 71º43’S), Roca Lake (41º21’S– 71º25’S), Guillelmo Lake (41º22’S– 71º30’S), Hess Lake (41º22’S– 71º43’S), Los Moscos Lake (41º22’S– 71º36’S), Steffen Lake (41º31’S– 71º33’S); Santa Cruz Province: Santa Cruz River (50º00’S– 69º00’S),Argentino Lake (52º20’S– 72º20’S). R: Ortubay et al. (1994), Semenas and Trejo (1997), Trejo et al. (2000), Rauque et al. (2002), Revenga et al. (2005), Viozzi et al. (2009), Fernandez (2011), Paterson et al. (2013), Fernandez et al. (2015a,b). C: vouchers (MACN-Pa 386, 461/1–2; UNCo-Pa accession numbers not provided by Semenas and Trejo 1997).

Galaxias platei Steindachner ( Osmeriformes, Galaxiidae). SI: intestine. SD: adult. L: Río Negro Province: Los Césares Lagoon (41º18’S, 71º42’W), Moreno Lake (41º18’S, 71º42’W); Chubut Province: Esperanza Lake (42º13’S, 71º50’W), Cholila Lake (42º27’S, 71º40’W); Santa Cruz Province: Pueyrredón Lake (47º16’S, 72º00’W); Tierra del Fuego Province: Yehuín Lake (54º25’S, 67º40’W). R: Ortubay et al. (1994), Rauque et al. (2003, 2006), Paterson et al. (2013).

Odontesthes hatcheri (Eigenmann) ( Atheriniformes, Atherinopsidae) (type host). SI: intestine. SD: adult. L: Río Negro Province: Morenito Lake (41º02’S, 68º34’W), Carrilafquen Chica Lake (41º12’S, 69º25’W); Chubut Province: Rivadavia Lake (42º36’S, 71º39’W), Terraplén Lagoon (42º59’S, 71º32’W); Tierra del Fuego Province: Ushuaia. C: syntype (ZMH V 4083). R: Linstow (1896), Porta (1905), Ortubay et al. (1994), Flores et al. (2016) (see note below).

Olivaichthys viedmensis (MacDonagh) ( Siluriformes, Diplomystidae). SI: intestine. SD: adult. L: Río Negro Province: Nahuel Huapi Lake (41º03’S, 71º25’W), Moreno Lake (41º18’S, 71º42’W), Hess Lake (41º22’S, 71º43’W), Limay River. R: Ortubay et al. (1994), Rauque et al. (2003).

Oncorhynchus mykiss (Walbaum) ( Salmoniformes, Salmonidae). SI: intestine. SD: adult. L: Rio Negro Province: Alicurá Reservoir (40º40’S, 71º00’W), Nahuel Huapi Lake (41º03’S, 71º25’W), Moreno Lake (41º18’S, 71º42’W), Hess Lake (41º22’S, 71º43’W), Castilla Creek, Limay River, Ñirihuau River; Chubut Province: Cholila Lake (42º27’S, 71º40’W), Futalaufquen Lake (42º50’S, 71º40’W), Terraplén Lagoon (42º59’S, 71º32’W), Tres Lake (44º15’S, 71º34’W), Fontana Lake (44º55’S, 71º30’W), Musters Lake (45º30’S, 69º10’W), Grande/Futaleufú River, Corcovado/Carrenleufú River; Santa Cruz Province: Santa Cruz River. R: Ortubay et al. (1994), Rauque et al. (2002, 2003, 2006, 2018), Tanzola et al. (2009), Fernandez (2011), Paterson et al. (2013) (see note below).

Percichthys trucha (Valenciennes) ( Perciformes, Percichthyidae). SI: intestine. SD: adult. L: Río Negro Province: Alicurá Reservoir (40º40’S, 71º00’W), Nahuel Huapi Lake (41º03’S, 71º25’W), Moreno Lake (41º18’S, 71º42’W), Hess Lake (41º22’S, 71º43’W), Limay River; Chubut Province: Cholila Lake (42º27’S, 71º40’W), Terraplén Lagoon (42º59’S, 71º32’W), Musters Lake (45º30’S, 69º10’W); Santa Cruz Province: Santa Cruz River. R: Ortubay et al. (1994), Rauque et al. (2003, 2006), Paterson et al. (2013) (see note below).

Salmo salar Linnaeus ( Salmoniformes, Salmonidae). SI: intestine. SD: adult. L: Chubut Province: Cholila Lake (42º27’S, 71º40’W). R: Ortubay et al. (1994).

Salmo trutta Linnaeus ( Salmoniformes, Salmonidae). SI: intestine. SD: adult. L: Río Negro Province: Nahuel Huapi Lake (41º03’S, 71º25’W), Hess Lake (41º22’S, 71º43’W),Limay River; Chubut Province: Futalaufquen Lake (42º50’S, 71º40’W), Amutui-Quimei Reservoir (43º03’S, 71º45’W). R: Ortubay et al. (1994), Rauque et al. (2018).

Salvelinus fontinalis (Mitchill) ( Salmoniformes, Salmonidae). SI: intestine. SD: adult. L: Río Negro Province: Moreno Lake (41º18’S, 71º42’W); Chubut Province: Cholila Lake (42º27’S, 71º40’W), Terraplén Lagoon (42º59’S, 71º32’W),General Vintter Lake (43º52’S, 71º30’W),Fontana Lake (44º55’S, 71º30’W), Corcovado/ Carrenleufú River; R: Ortubay et al. (1994), Rauque et al. (2003, 2018).

Salvelinus namaycush (Walbaum) ( Salmoniformes, Salmonidae). SI: intestine. SD: adult. L: Santa Cruz Province: Argentino Lake (50º25’S, 72º50’W). R: Ortubay et al. (1994).

Note. Linstow (1896) described Acanthocephalus tumescens from Odontesthes hatcheri [syn. Basilichthys microlepidotus] from Ushuaia, Tierra del Fuego. The type-locality of A. tumescens was obtained from the specimens examined by Linstow (1896) and desposited at the ZMH. Odontesthes hatcheri is distributed to the continental Andean Region of southern South America (Conte-Grand et al. 2015 and references therein). Therefore, it is possible that the type host for Acanthocephalus tumescens could be other similar marine silverside species (see note for Heterosentis heteracanthus above). Ortubay et al. (1994) reported adult specimens of Acanthocephalus tumescens in the intestine of Percichthys colhuapiensis MacDonagh from Musters Lake. Percichthys colhuapiensis is considered a morphotype of Percichthys trucha (see Ruzzante et al. 2011). Rauque et al. (2002) and Fernandez (2011) experimentally infected rainbow trout Oncorhynchus mykiss with specimens of Acanthocephalus tumescens collected from Galaxias maculatus from Mascardi Lake, Río Negro Province. Fernandez (2011) experimentally infected Oncorhynchus mykiss with Acanthocephalus tumescens by feading rainbow trout with naturally infected Galaxias maculatus from Moreno Lake, Espejo Lake and Gutiérrez Lake, Río Negro Province.

Malacostraca

Hyalella patagonica (Cunningham) ( Amphipoda, Hyalellidae). SI: hemocoel. SD: cystacanth. L: Río Negro Province: Moreno Lake (41º05’S, 71º19’W), Gutiérrez Lake (41º12’S, 71º26’W), Mascardi Lake (41º17’S, 71º38’W). R: Rauque and Semenas (2007, 2009, 2011), Rauque and de los Ríos Escalante (2013).

Hyalella sp. ( Amphipoda, Hyalellidae). SI: hemocoel. SD: cystacanth. L: Neuquén Province: Espejo Lake (40º41’S, 71º40’W); Río Negro Province: Mascardi Lake (41º17’S, 71º38’W) ; Los Césares Lagoon (41º19’S, 71º43’W) , Roca Lake (41º21’S, 71º25’W) , Guillelmo Lake (41º22’S, 71º30’W) ; Chubut Province: Epuyén Lake (42º11’S, 71º30’W) , Rivadavia Lake (42º36’S, 71º39’W) , Verde Lake (42º43’S, 71º43’W). R: Rauque (2013) .