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Taxonomy of the Neotropical Freshwater Crab Family Trichodactylidae

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Taxonomy of the Neotropical Freshwater Crab Family Trichodactylidae Nauplius 20(1): 27-40, 2012 27 Taxonomy of the Neotropical freshwater crab family Trichodactylidae. VI. The genera Avotrichodactylus and Rodrigue- zia (Decapoda: Brachyura: Trichodactylidae) Célio Magalhães and Michael Türkay (CM) Instituto Nacional de Pesquisas da Amazônia. Caixa Postal 478, 69011-970 Manaus, AM, Brazil. E-mail: [email protected] (MT) Senckenberg Forschunginstitut. Senckenberganlage 25, 60325 Frankfurt a.M., Germany. E-mail: [email protected] Abstract The taxonomy of two trichodactyline genera of the Neotropical freshwater crab family Trichodactylidae are revised. The genus Avotrichodactylus Pretzmann, 1968, includes two species, A. constrictus (Pearse, 1911) and A. oaxensis Rodríguez, 1992; the genus Rodriguezia Bott, 1969, also has two species, R. mensabak Cottarelli and Argano, 1977, and R. villalobosi (Rodríguez and Manrique, 1967). The taxonomic statuses of all the species are discussed and a short diagnosis is provided for each. A complete list of the material examined and a map of geographic distribution of the species are furnished. Key words: Brachyura, Crustacea, Mexico, Neotropical region, Systematics. Introduction Bott (1969a) to assign them separate subgeneric ranks under Trichodactylus. Pretzmann (1968) The four species of the trichodactylid erected the subgenus Avotrichodactylus for T. freshwater crabs that occur in southern Mexico constrictus based on the curved and tapering are included in the subfamily Trichodactylinae apex of the first gonopod, while Bott (1969a) owing to similarities with the South American introduced Trichodactylus (Rodriguezia) for T. representatives of the genus Trichodactylus villalobosi, diagnosed by the second gonopod Latreille, 1828, in carapacial and gonopodal being shorter than the first one. Bott (1969a) morphology (Pretzmann, 1968; Bott, 1969a; did not recognize Avotrichodactylus because Rodríguez, 1992; Magalhães and Türkay, he stated that Pretzmann had not in fact 1996a). The first two species described from examined males of T. constrictus. Pretzmann this region were in fact assigned to this genus, (1978) subsequently raised Avotrichodactylus viz., Trichodactylus constrictus Pearse, 1911, and to genus level on the basis of the gonopodal T. villalobosi Rodríguez and Manrique, 1967. morphology and distribution of the species. However, these species have some peculiarities In his monographic treatment of the in the morphology of the first and second pair Trichodactylidae, Rodríguez (1992) kept it of gonopods, which led Pretzmann (1968) and with this rank and also elevated Rodriguezia 28 Magalhães & Türkay: Taxonomy of Avotrichodactylus and Rodriguezia to genus. This classification was maintained History Museum, London; MNHN, by Magalhães and Türkay (1996a) in their Muséum National d’Histoire Naturelle, proposal of a generic system for the family, and Paris; NHMW, Naturhistorisches Museum more recently followed by other workers (see Wien, Wien; RMNH, National Museum of Ng et al., 2008; De Grave et al., 2009). Natural History (Naturalis), Leiden; SMF, In this paper, we continue our ongoing Senckenberg Museum, Frankfurt am Main; taxonomic revision of the trichodactylid URTV, Universitá degli Studi di Roma “Tor genera (see Magalhães and Türkay, 1996a, b, Vergata”, Dipartimento di Biologia, Roma; c; 2008a, b) by presenting brief diagnoses and USNM, National Museum of Natural History, illustrations of the carapace and the male first Smithsonian Institution, Washington, D. C.; pleopods for each species of Avotrichodactylus and ZMH, Zoologisches Museum, Universität and Rodriguezia, as well as remarks about their Hamburg, Hamburg. Other abbreviations – intraspecific variability. A key to the species of alt., altitude; coll., collector(s); juv., juvenile; both genera is also provided. and plp 1 and plp 2, first and second male gonopods, respectively. Material and Methods The measurements are given in Systematic millimeters; measurements of the type and the largest specimen examined are usually provided. The terminology used for gonopod Avotrichodactylus Pretzmann, 1968 description is explained in Magalhães and Trichodactylus (Trichodactylus). – Coifmann, Türkay (1996a); the number of anterolateral 1939: 111 [part.] [not Trichodactylus Latreille, teeth of the carapace includes neither the 1828]. exorbital angle (when toothed) nor the Trichodactylus (Avotrichodactylus) Pretzmann, accessory tooth sometimes present at base 1968: 71. of the exorbital angle. Type specimens of Trichodactylus (Rodriguezia). – Bott, 1969a: 25 species were examined, except where noted [part.] [not Trichodactylus (Rodriguezia) Bott, otherwise. Synonymies presented include 1969]. mainly references from 1969 onwards; see Avotrichodactylus. – Pretzmann, 1978: 4. – Bott (1969a) for synonymies prior to that year. Pretzmann, 1980: 661. – Rodríguez, 1992: 63. Geographic distribution of the species was – Villalobos-Hiriart et al., 1993: 284. – Álvarez mapped on the basis of the records presented et al., 1996: 129. – Magalhães and Türkay, in this paper and from the literature. 1996a: 772. – Suárez, 2005: 155. – De Grave Abbreviations: Measurements – cb, et al., 2009: 42. – Álvarez et al., 2011: 275. carapace breadth, measured across the carapace Trichodactylus. – Guinot, 1988: 19 [part.] [not at its widest point; cl, carapace length, Trichodactylus Latreille, 1828]. measured along the midline, from the frontal to the posterior margin. Repositories of the Type species: Trichodactylus constrictus specimens – CNCR, Coleccíón Nacional de Pearse, 1911 [by monotypy]. Crustaceos, Instituto de Biología, Universidad Nacional Autónoma de México, Mexico Remarks: Although the plp 2 is similar City; INPA, Instituto Nacional de Pesquisas to that of Rodriguezia in being shorter than the da Amazônia, Manaus; IVIC, Colección plp 1, the tapered distal part of the plp 1 and de Referencia de Crustáceos Decápodos, its strong curvature in ventrolateral direction, Instituto Venezolano de Investigaciones as well as the fused III-V abdominal somites (as Científicas, Caracas; NHM, The Natural opposed to the straight plp 1 with broad apex, and all abdominal somites free in Rodriguezia), Nauplius 20(1): 27-40, 2012 29 justify the status of Avotrichodactylus as a It was first deposited in the University of distinct genus. Michigan Museum (cat. number 41717), but was subsequently transferred to the USNM. Key to the species of Avotrichodactylus 1. Male plp 1 with apical portion strongly Paratypes: 7 females (cb 11.8, cl 10.6; to curved ventrolaterally (Figs. 7, 8); cb 21.0. cl 19.1), (USNM 98400), 1 female carapace usually with 2-3 anterolateral (USNM 79361), all with same data as in teeth............................................A. constrictus holotype. -. Male plp 1 with apical portion nearly straight (Figs. 11, 12); carapace usually with 4-5 Material: Mexico — No precise locality: anterolateral teeth..........................A. oaxensis 3 males, 1 female (NHMW 1829), V.1883. — State of Veracruz: 2 males, 1 female (USNM Avotrichodactylus constrictus (Pearse, 1911) 234436), NW+N sides of mesa San Lorenzo, (Figs. 1 - 9) SSW of Tenochtetlán, 03.II.1968, R.R. Miller Trichodactylus constrictus Pearse, 1911: 4, fig. et al.; 2 males, 4 females (USNM 128406), 4. – Rodríguez and Manrique, 1967: 183. – Zanja la Mina, off Mesa San Lorenzo, ca. 6 Smalley, 1970: 104, fig. 9. Km SSW of Tenochtitlán, 10.VII.1968, E.S. Trichodactylus (Trichodactylus) constrictus. – Wing et al.; 2 males, 1 female (INPA-CR Coifmann, 1939: 111. 503), idem; 12 males, 10 females (CNCR Trichodactylus (Avotrichodactylus) constrictus. – 2200), El Zapotal, Catemaco, 18.IX.1954, A. Pretzmann, 1968: 71. Villalobos; 6 males, 4 females (CNCR 13347), Trichodactylus (Rodriguezia) bidens Bott, río Maquinas, entre la Estación de Biología 1969a: 25, pl. 24, figs. 68-69. – Cottarelli and Tropical Los Tuxtlas y Montepio, 5.V.1995, Argano, 1977: figs. 3-4. – Reddell, 1981: 114. F. Álvarez; 3 males, 1 female (CNCR 13385), Trichodactylus (Rodiguezia) [sic !] constrictus. – río La Palma, entre Catemaco y Montepio, Bott, 1969a: 26 [error]. 2.VI.1995, J.C. Molinero and R. Robles; 1 Rodriguezia bidens. – Bott, 1969b: 270. female (CNCR 10624), arroyo entre los río Avotrichodactylus constrictus. – Pretzmann, La Palma y río Maquinas, Los Tuxtlas, San 1980: 661, pl. 14, figs. 61-63; pl. 15, fig. 69; Andres Tuxtla, 12.XII.1986, coll. unknown; 2 pl. 18, fig. 81. – Rodríguez and Hobbs Jr., males, 1 female (CNCR 16830), río La Palma, 1989: 399. – Rodríguez, 1992: 66, figs. 2A, entre Catemaco y Montepio, San Andres 10I, 12F, 23A-E. – Villalobos-Hiriart et al., Tuxtla, 11.VIII.1985, coll. unknown; 1 female 1993: 284. – Magalhães and Türkay, 1996a: (CNCR 9261), río Palma, San Andres Tuxtla, 67, 68, 72. – Álvarez and Villalobos, 1997a: 27.IX.2008, coll. unknown; 1 male, 1 female 416. – Álvarez and Villalobos, 1997b: 438. – (CNCR 15529), río Maquinas, San Andres Álvarez et al., 1999: 23, fig. 3. – Álvarezet al., Tuxtla, 12.viii.1995, coll. unknown; 3 males 2005: 191. – Álvarez et al., 2011: 275. (CNCR 13277), entre El Potrero y Medellin, Trichodactylus bidens. – Holthuis, 1986: 614. Los Tuxtlas, 7.VII.1986, F. Álvarez; 1 male – Guinot and Geoffroy, 1987: 21. – Guinot, (CNCR 12917), Santiago Tuxtla, Medellín, 1988: 19. desviación a Tres Zapotes, 7.VII.1986, F. Avotrichodactylus bidens. – Rodríguez and Álvarez; 6 males, 2 females (CNCR 13348), Hobbs Jr., 1989: 399. – Rodríguez, 1992: 65, La Playita, río Tepango, Santiago Tuxtla, fig. 23F. – Villalobos-Hiriartet al., 1993: 284. 3.V.1995,
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