Two new species of South American freshwater crayfish genus Parastacus Huxley, 1879 (Crustacea: Decapoda: Parastacidae)

Abstract

Two new species of Parastacus Huxley, 1879 are described from material collected in the state of Rio Grande do Sul, southern Brazil: Parastacus fluviatilis sp. nov. from highland streams and Parastacus caeruleodactylus sp. nov. from wetlands. Parastacus fluviatilis sp. nov. is distinguished mainly by large chelipeds with dense setae cover on the cutting edge of fingers, telson subtriangular with two lateral blunt spines and strongly concave ventral surface of lateral process of thoracic sternites 6 and 7. Parastacus caeruleodactylus sp. nov. is distinguished mainly by blue cheliped fingers and a large gap between them, reduced abdomen, dorsal and ventral margins of dactylus, propodus and carpus of second pair of pereiopods with tufts of long setae and mid-dorsal carina of exopod of uropods unarmed. According to IUCN Red List criteria both species are considered endangered. Habitat characterization and a method for defining the shape of second abdominal pleura are also provided.

Ludwig Buckup’s academic life and his contribution to Carcinology

“…Several articles published by his research group constitute an essential basis for the continuation of research on Neotropical biota. The family Parastacidae was extensively investigated by his research group (Fontoura and Buckup, 1989a;1989b;1991;Buckup and Rossi, 1993;Buckup and Bond-Buckup, 1994;Almeida and Buckup, 1997; Buckup, 1957 Agroecus brevicornis Buckup, 1957 Reduviidae Apiomerus riograndensis Buckup, 1957 Crustacea Isopoda Dubioniscidae Novamundoniscus meridionalis (Araujo & Buckup, 1994) Philosciidae Benthana taeniata Araujo & Buckup, 1994 Platyarthridae Trichorhina acuta Araujo & Buckup, 1994 Trichorhina bicolor Araujo & Buckup, 1996 Decapoda Aeglidae Aegla camargoi Buckup & Rossi, 1977 Aegla franciscana Buckup & Rossi, 1977 Aegla leptodactyla Buckup & Rossi, 1977 Aegla plana Buckup & Rossi, 1977 Aegla serrana Buckup & Rossi, 1977 Aegla grisella Bond- Aegla inconspicua Bond- Aegla inermis Bond- Aegla intercalata Bond- Aegla itacolomiensis Bond- Aegla jarai Bond- Aegla lata Bond- Aegla leptochela Bond- Aegla ligulata Bond- Aegla longirostri Bond- Aegla marginata Bond- Aegla microphthalma Bond- Aegla obstipa Bond- Aegla parva Bond- Aegla ringueleti Bond- Aegla rossiana Bond- Aegla septentrionalis Bond- Aegla spinipalma Bond- Aegla spinosa Bond- Aegla violacea Bond-Buckup & Buckup, 1994 Aegla pomerana Bond- Aegla muelleri Bond- Aegla renana Bond- Aegla leachi Bond- Buckup & Buckup, 2012 Aegla lancinhas Bond- Buckup & Buckup, 2015 Parastacidae Parastacus laevigatus Buckup & Rossi, 1980 Parastacus fluviatilis Ribeiro & Buckup, 2016 2000; Horn et al, 2004;Vinagre et al, 2004;Reid et al, 2006;Buckup et al, 2007b;2007c;Noro et al, 2007;Noro and Buckup, 2010;SilvaCastiglioni et al, 2010). From 1979 on, he published several articles about the family Aegli...…”

A new species of Parastacus Huxley, 1879 (Crustacea, Decapoda, Parastacidae) from a swamp forest in southern Brazil

“…The freshwater crayfish of the genus Parastacus Huxley, 1879 are currently represented by ten species, distributed in the southern regions of South America, specifically in Chile, Argentina, Uruguay and Brazil (for the latter in the states of Rio Grande do Sul and Santa Catarina) (Buckup and Rossi, 1980;1993;Ribeiro et al, 2016). According to previous phylogenetic studies, Parastacus forms a well supported monophyletic clade and is closely related to Samastacus Riek, 1971and Viralastacus Hobbs, 1991(Crandall et al, 2000Toon et al, 2010).…”

“…Morphological parameters used were defined by Buckup and Rossi (1980), Hopkins (1970), Morgan (1997) and Ribeiro et al (2016). Measurements of all type specimens can be found in Tab.…”

“…1. Size and shape of the S2 pleura were defined according to Ribeiro et al (2016). Sex was determined based on the morphology of the genital apertures, according to Rudolph (1997).…”

“…Sex was determined based on the morphology of the genital apertures, according to Rudolph (1997). Morphological descriptions follow Riek (1971), Buckup and Rossi (1980), Hobbs (1987), Morgan (1997), Holdich (2002) and Ribeiro et al (2016). The taxonomic classification follows De Grave et al (2009).…”