Parastacus caeruleodactylus Ribeiro & Araujo

Ribeiro, Felipe Bezerra & Araujo, Paula Beatriz, 2024, Taxonomic review of the genus Parastacus Huxley, 1879 (Decapoda: Astacidea: Parastacidae) with description of five new species, Zootaxa 5455 (1), pp. 1-84 : 45-47

Parastacus caeruleodactylus Ribeiro & Araujo in Ribeiro et al., 2016

( Fig. 26 )

Parastacus caeruleodactylus Ribeiro & Araujo in Ribeiro et al., 2016: 311 , figs. 2, 6–9.—­ Crandall & De Grave 2017: 641.—­ Rogers et al. 2020: 879 (key), fig. 23.67B.—­ Huber et al. 2022: 276 (key).—­ De los Ríos-Escalante et al. 2022: 1129 (appendix), fig. 1d.—­ De los Ríos-Escalante et al. 2022: 1129 (appendix), fig. 1i.—­ Huber et al. 2024: 14 (key).

Type locality. Morrinhos do Sul , state of Rio Grande do Sul, Brazil ( Ribeiro et al. 2016) .

Additional material examined. Brazil, Rio Grande do Sul: Dom Pedro de Alcântara, five males and one female, Reserva Mata do Professor Baptista , 11/I/2019, coll. F. B. Ribeiro, A. F. Huber & K. M. Gomes ( UFRGS 6501 ) .

Diagnosis and Description. Ribeiro et al. (2016).

Distribution. Brazil: state of Rio Grande do Sul ( Ribeiro et al. 2016).

Color of living specimens. Ribeiro et al. (2016) ( Fig. 26 ).

Habitat and Ecology. Swamp forests ( Ribeiro et al. 2016). Parastacus caeruleodactylus builds deep burrows with chimneys averaging 10 cm in height and width ( Ribeiro et al. 2016). Burrows of P. caeruleodactylus can be identified as type 2 according to Horwitz and Richardson’s (1986) classification and the species can be considered a primary burrower based on Hobbs’ (1942) classification ( Ribeiro et al. 2020). The reproductive period of this species follows the pattern of spring-summer and the offspring number ranges from 20 to 40 ( Ribeiro et al. 2019). The second juvenile stage of P. caeruleodactylus was described by Ribeiro et al. (2019), raising important new information for the reproductive biology of South American parastacids.

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FIGURE 26. Parastacus caeruleodactylus Ribeiro & Araujo in Ribeiro et al., 2016: living specimens in aquarium. A—­ male specimen; B—­ female specimen.