Dilocarcinus pagei Stimpson, 1861

Figs 1, 2, 3, 5 A, B

Dilocarcinus septemdentatus – Nobili 1896: 1 [part].

Orthostoma septemdentatum — Nobili 1898: 10 [part].

Dilocarcinus pagei Stimpson, 1861: 373. — Rodríguez 1981: 48 (in list). — Rodríguez 1992: 15 (in list), 108 (in key), 125 [part]. — Morrone and Lopretto 1994: 100, fig. 19; 107 (in list). — Morrone and Lopretto 1995: 4 (in list). — Morrone and Lopretto 1996: 71 (in list). — Magalhães 1998: 519 [part]. — Magalhães 2000: 25, 56, 59 (in list), 60, 61, 120, 144, 175, 178, 180, 181, 288, 289. — Morrone and Lopretto 2001: 52, fig. 8 (map), 53 [part]. — Magalhães 2001: 70 (in list), 133 (in list), 138 (in list). — Magalhães 2003: 203 (in key), 204, figs 106 (map), 107 [part]. — Collins et al. 2004: 254 (in list). — Magalhães et al. 2005: 1934, fig. 1–5. — Magalhães and Türkay 2008: 187 (in key), 190, figs 8 a, 11 (map) [part]. — Cumberlidge et al. 2009: suppl. material, 26 (in list) [part]. — Azevedo-Santos and Lima-Stripari 2010: 200, fig. 1. — Magalhães 2016: 431 (in list) [part]. — Rogers et al. 2020: 946 (in key) [part].

Dilocarcinus septemdentatus — Moreira 1901: 49 [part.].

Trichodactylus (Dilocarcinus) orbicularis — Rathbun, 1904: 242 (in list) [part]. — Rathbun 1906 a: 58 [part]. — Moreira, 1912: 151, pl. 5. — Moreira, 1913: 19, pl. 7. — Colosi 1920: 13 (in list), 15. — Coifmann 1939: 113 (in list) [part]. — Ringuelet, 1948: 325. — Ringuelet, 1949: 101, pl. 9, fig. 2.

Dilocarcinus (Dilocarcinus) pagei pagei — Bott 1969: 46, pl. 9, figs 16 a, b; pl. 20, fig. 47. — Lopretto 1976: 68 (in list), 84, figs 26–29. — Manning and Hobbs 1977: 159 (in list). — Lopretto 1981: 22.

Dilocarcinus (Dilocarcinus) pagei cristatus — Lopretto 1976: 68 (in list), 86, figs 14–17. — Lopretto, 1981: 22.

Dilocarcinus (Dilocarcinus) pagei — Lopretto 1981: 23, pls. 1–3. — Zwink, 1990: 103 (in list).

Dilocarcinus pagei pagei — Magalhães and Türkay 1996: 67 (in list), 78 (in list) [part]. — Lopretto, 1998: 544 (in list). — Ng et al. 2008: 187 (in list) [part].

Diagnosis.

G 1 with ventral margin gently continuous; lateral side with rounded subdistal lobe weakly developed (“ sl ” in Fig. 5 A).

Description.

Carapace suborbicular markedly convex, dorsally smooth; front unarmed, deflexed, distinctly bilobed; anterolateral margin with 6–7 narrow, sharp teeth after exorbital tooth. Pleon with somites III – VI fused; third somite with distinct transverse carina along distal margin in both sexes; male telson subtriangular, anterior margin nearly as long as posterior margin of pleonal somite VI, proximal portion of telson outer margins convex, tip rounded. G 1 (Fig. 5 A, B) slender, distal half slightly curved in lateral direction; ventral margin gently continuous, bearing proximal and median patches of setae of varying lengths; dorsal border moderately convex; marginal suture following mesial surface, slightly twisted towards lateral and dorsal surfaces close to apex after subdistal lobe; marginal suture proximal portion bearing row of short and long setae; lateral surface of apical portion with well-developed rounded subdistal lobe, covered by dense patch of small spines, less dense across dorsal surface of apical portion; mesodorsal surface of apical portion covered by dense subdistal tuft of short and long setae; apex short, flat; gonopore narrow, positioned terminally.

Type locality.

Paraguay.

Distribution.

Paraguay and in both upper and lower Paraná River basins, in Brazil (Mato Grosso, Goiás, Minas Gerais, Mato Grosso do Sul, São Paulo, Paraná), Paraguay, and Argentina (Fig. 6).

Type material.

Holotype, 1 ♀, dry (USNM 2463), date unknown, Page [not examined].

Material examined.

BRAZIL — Mato Grosso: • 1 ♂; Cuiabá River, Cuiabá; 6. v. 1984; U. Barbosa; INPA 137 • 5 ♂♂ 1 ♀; Rodovia Transpantaneira, Poconé; 7–8. vi. 1985; V. A. Araújo; INPA 366 • 1 ♀; Poconé; L. Amato; UFRGS 4431 • 1 ♀; Paranaitá; 18. i. 2008; S. N. C. Hernani Filho; CCDB 2179 • 1 ♀; São Luiz de Cáceres; MZUSP 1652 • 3 ♀♀; Rodovia Transpantaneira; 13. xii. 201; J. Vas; MZUSP 4771 • 1 ♀; Miranda River, Miranda; ix. 1979; O. Moreira Filho; MZUSP 4774 • 3 ♀♀; Mato Grosso; 14. xii. 1976; P. E. Vanzolini; MZUSP 6335 • 1 ♂ 1 ♀; Aricá River, Km 26, BR 364; 6–13. xi. 1982; Equipe de Ictiologia - DCB – UFSCAR; MZUSP 7050 • 2 ♂♂ 1 ♀; Poconé, Baia do Pio; 6. vii. 1985; V. Araújo; MZUSP 9502 • 1 ♀; Porto Espiridião; 25. xii. 1976; P. E. Vanzolini; MZUSP 9516 • 1 ♂; Arilas River, Equipe DCB; MZUSP 9687 • 2 ♂♂ 1 ♀; confluence of Paraguay and Corumbá Rivers; 29. vi. 2011; MZUSP 24547 — Goiás: • 2 ♂♂; Catalão; 03. vii. 2021; E. Mossolin; CCDB 6822 • 1 ♂ 1 ♀; Anhanguera; 18°20'30.32"S, 48°13'02.45"W; 05. vii. 2021; E. Mossolin; CCDB 6827 • 3 ♂♂; Anhanguera, Fazenda do ″ Dr. Paiva ″, 18°19'59.32"S, 49°14'06.92"W; 15. x. 2021; E. Mossolin; INPA 4795 — Minas Gerais: • 2 ♂♂; Rio Claro, Reservatório de Furnas, region of Raizama; V. M. A. Santos; INPA 1756 • 2 ♂♂; Carmo do Rio Claro; 20°57'16.7"S, 46°09'11.1"W; 27. ii. 2012; F. L. Carvalho, L. P. Rezende, D. P. Andrade; CCDB 4341 • 2 ♂♂ 1 ♀; Fazenda Jacúba, Carmo do Rio Claro; 3. xi. 2012; A. S. Costa; CCDB 4342 • 2 ♂♂ 1 ♀, Araguari River; 15°27'16.24"S, 48°35'33.12"W; 20. vii. 2021; A. C. G. Bartoze and G. Jacobucci; INPA 4796 • 1 ♂; Conquista, Margin of Rio Grande,; 26. xii. 2006; W. Santana and M. Cardoso Jr.; MZUSP 18680 — Mato Grosso do Sul: • 1 ♂; Aquidauana, Fazenda Taboco, Branch of Taboco River; 20°3.3'S, 55°38.8'W; 31. iii. 1998; C. Magalhães; INPA 1307 • 3 ♂♂ 3 ♀♀; Corumbá; 15. x. 2009; R. Biagi; CCDB 2727 • 4 ♂♂ 7 ♀♀; same locality; 12. x. 2012; Guilherme; CCDB 4348 • 1 ♂; same locality; 18°59'49.0"S, 57°39'15.2"W; 16. xi. 2013; F. L. Carvalho; CCDB 5013 • 1 ♂; same locality; 18°48'28.1"S, 57°30'25.9"W; 17. xi. 2013; F. L. Carvalho; CCDB 5014 • 4 ♂♂ 3 ♀♀; Vermelho River, tributary of the Miranda River, Corumbá, next to Paço do Lontra; 6. ix. 1998; C. Magalhães et al.; INPA 1308 • 1 ♂ 2 ♀♀; Negro River, next to rodovia Nhecolândia-BR 262, Corumbá; 19°17.1'S, 57°3.3'W; 8. ix. 1998; C. Magalhães et al.; INPA 1309 • 2 ♂♂ 6 ♀♀; Porto Murtinho; 24. viii. 2010; F. L. Mantelatto; CCDB 2972 • 9 ♂♂ 6 ♀♀; Miranda, Pantanal sul-matogrossense; 09. vii. 2019; J. A. F. Pantaleão; CCDB 6470 • 2 ♂♂; 30 km NW de Miranda, Pantanal sul-matogrossense; 24. vii. 1982; L. F. B. de Oliveira; UFRGS 3425 • 1 ♂; Paiaguás, Fazenda Milagre; 19. vii. 1986; F. R. Antonelli; MZUSP 8012 • 3 ♂♂ 3 ♀♀; Miranda River, Base de Pesquisa do Pantanal da UFMS, 4. viii. 1989; A. C. Marini; MZUSP 9889 • 4 ♂♂ 2 ♀♀; Lagoon next to BR–262, Miranda; 11. vi. 1993; MZUSP 11534 • 6 ♂♂ 12 ♀♀; Surroundings of the city of Miranda; 5. iv. 2012; MZUSP 25939 • 2 ♂♂ 2 ♀♀; Corumbá, Right margin of Paraguay River, Base Experimental da UFMS, MZUSP 25174 — São Paulo: • 1 ♂; Bebedouro; 21. xii. 2009; R. J. Ilário; UFRGS 4565 • 8 ♂♂ 2 ♀♀; Paraná River, Castilho; 23. ix. 2017; T. Magalhães; CCDB 6338 • 1 ♂; Pardo River, sub-basin of Grande River, Colômbia; 20°10'0.87"S, 48°36'8.35"W; 24. vii. 2000; F. L. Mantelatto; CCDB 1461 • 2 ♂♂; Viradouro, Basin of Mogi – Guaçu River, Fazenda Três Barras; 20°54'48.9"S, 48°10'29.6"W; 11. viii. 2000; W. Avelar; INPA 872 • 1 ♂ 1 ♀; Morro Agudo; 20°47'11"S, 48°01'28"W; 09. iii. 2020; N. França, G. Faganello, E. Santos and L. Rogeri; CCDB 6622 • 2 ♂♂; same locality; 20°47'11"S, 48°01'28"W; 16. iii. 2020; N. França, G. Faganello, E. Santos and L. Rogeri; CCDB 6623 • 1 ♂; Ribeirão Preto, lake of USP-RP; 21°10'06.31"S, 47°51'26.44"W; 01. iv. 2005; E. Mossolin; CCDB 2796 • 8 ♂♂ 3 ♀♀; Ribeirão Preto, Dam of Galo Bravo; 21°07'06.72"S, 47°49'30.32"W; 3. iv. 2013; E. C. Mossolin, M. Negri, T. Magalhães and R. C. Buranelli; CCDB 4603 • 5 ♂♂ 4 ♀♀; Tietê River, Campo Grande; viii. 2019; A. P. Covich; CCDB 6501 • 2 ♂♂ 1 ♀; São José do Rio Preto, municipal reservoir Rio Grande Basin; 20°48'27"S, 49°21'54.9"W; 12. x. 1999; M. A. A. Pinheiro and G. Y. Hottori; INPA 774 • 2 ♂♂; Viradouro. Basin of Mogi Guaçu River, Fazenda Três Barras; 20°54'48.9"S, 48°10'29.6"W; 11. viii. 2000; W. Avelar; INPA 872 • 3 ♂♂ 3 ♀♀; Sertãozinho, Usina São Geraldo; 7. iii. 2008; F. L. Mantelatto, E. C. Mossolin and A. S. Costa; CCDB 3108 • 1 ♀; Teodoro Sampaio; 20. ix. 2019; LEPIB; MZUEL 508 • 2 ♀♀; Mogi – Guaçu River, Barrinha; 12. x. 1999; M. A. A. Pinheiros and G. Y. Hattori; MZUSP 13099 • 6 ♂♂ 2 ♀♀; São José do Rio Preto; 12. x. 1999; M. A. A. Pinheiros and G. Y. Hattori; MZUSP 13100 • 3 ♂♂; Colômbia; 20°10'17.0"S, 48°36'13.5"W; 24. vii. 2000; W. Avelar; MZUSP 13915 • 3 ♂♂; Rio Grande, between the cities of Mira Estrela and Cardoso; 20°01'51.7"S, 50°00'59.9"W; 23. i. 2003; S. Bueno, S. Rocha and E. Mossolin; MZUSP 15581 • 1 ♂ 2 ♀♀; Turvo River, between the cities of Cardoso and Riolândia; 23. i. 2003; S. Bueno, S. Rocha and E. Mossolin; MZUSP 15592 • 1 ♀; Pardo River, between the cities of Guaíra and Barretos; 24. i. 2003; MZUSP 15593 • 3 ♂♂ 2 ♀♀; Turvo River, between the cities of Icem and São José do Rio Preto; 20°25'07.1"S, 49°16'03"W; 23. i. 2003; S. Bueno, S. Rocha and E. Mossolin; MZUSP 15595 • 6 ♂♂; Mogi – Guaçu River, Barrinha; 20°11'09"S, 48°10'35"W; 25. i. 2003; S. Bueno, S. Rocha and E. Mossolin; MZUSP 15597 • 4 ♂♂ 1 ♀; Palestina, Fazenda São Pedro do Turvo; 4. xi. 2005; A. M. Juares; MZUSP 16920 • 1 ♂; same locality; 4. x. 2005; A. M. Juares; MZUSP 16924 • 2 ♀♀; Guapiaçu; 15. xii. 2005; A. M. Juares; MZUSP 16921 • 26 ♂♂ 1 ♀; Guapiaçu, Fazenda Pepelin; 15. xii. 2005; A. M. Juares; MZUSP 16922 • 8 ♂♂ 2 ♀♀; Guapiaçu; 15. xii. 2005; A. M. Juares; MZUSP 17212 • 21 ♂♂ 9 ♀♀; Guapiaçu, Pesqueiro Pepelin; 10. vi. 2007; A. M. Juares; MZUSP 18340 • 5 ♂♂ 6 ♀♀; Santa Albertina, Pousada Bacuri; 19°57'S, 50°45'W; 31. x. 2009; P. H. Carvalho; MZUSP 20488 • 1 ♂; São José do Rio Preto, Dam of Rio Preto; 1. viii. 1994; F. G. Taddei; MZUSP 26391 • 8 ♂♂ 5 ♀♀; Santa Albertina, Pousada Bacuri, Córrego Schmitt; 19°58'38.78"S, 50°46'43.01"W; 7. ix. 2012, M, Cardoso Jr., R. Garcez and C. E. Lopes; MZUSP 27898 — Paraná: • 1 ♂ 1 ♀; Basin of Paranapanema River, em lagos, Fazenda Doralice, Londrina; 22. vi. 2002; E. M. Amado; INPA 894 • 2 ♂♂; Teodoro Sampaio; 20. ix. 2019; LEPIB; MZUEL 509 • 3 ♂♂ 2 ♀♀; Porto Rico, Lagoa das Garças; 22°45'27"S, 53°16'13"W; 19. ix. 2010; PELD; MZUSP 24316 • 1 ♂; Cornélio Procópio, Lago São Luiz; 22. i. 2019; L. Gustavo; MZUSP 42441. PARAGUAY • 3 ♂♂; Paraguay River, Puerto Voluntad; 6. ix. 1997, C. Magalhães; INPA 1311 • 2 ♂♂ 2 ♀♀; Paraguay River, Puerto Lidia; 20°54'S, 57°55'W; 7. ix. 1997; C. Magalhães et al.; INPA 1312 • 2 ♂♂; Paraguay River, carca de la desembocadura del rio Aquidabán; 23°7'S, 57°38'W; 17. ix. 1997; C. Magalhães; INPA 1313 • 2 ♂♂ 2 ♀♀; Presidente Hayes; MZUSP 25923 • 2 ♀♀; Caaguazu, Road of Coronel Oviedo; 7. iii. 1996; D. W. Fromm and P. A. Fromm; MZUSP 25929. ARGENTINA — Formosa • 1 ♂; Río Pilcomayo National Park; xi. 1990; INPA 1304 — Chaco • 1 ♀; Chaco, Barranqueiras; 27. x. 1961; P. Vanzolini; MZUSP 1793 — Santa Fe • 1 ♂; Paraná River, near Santa Fe; 14. xii. 2012; C. Magalhães, P. Collins and D. Carvalho; INPA 2130.

Remarks.

The upper clade in the phylogram of Fig. 1 groups all the specimens distributed in the Paraguay – Paraná river system, to which the name D. pagei is available. The holotype of D. pagei is a dried female specimen (see Magalhães and Türkay 2008: 191, fig. 8 a) but males of the populations distributed in these southern basins have a G 1 morphology like the one illustrated by Bott (1969: pl. 20, fig. 47) for a specimen from the Paraguay River (SMF 4407). The morphology of this G 1 is coincident with that described above, i. e., with a continuous ventral margin and a weakly-developed subdistal lobe (Fig. 5 A, B).