Parastacus longidactylus Huber, Araujo & Ribeiro, 2024

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 : 51

Parastacus longidactylus Huber, Araujo & Ribeiro, 2024

Parastacus longidactylus Huber et al. 2024: 3 , 14 (key), Figs. 1–4 .

Type locality. Amaral Ferrador , Rio Grande do Sul, Brazil ( Huber et al. 2024) .

Diagnosis and Description. Huber et al. (2024).

Distribution. Brazil: state of Rio Grande do Sul ( Huber et al. 2024).

Color of live specimens. Data not available.

Habitat. Streams ( Huber et al. 2024 in press). Information concerning burrows and burrowing behavior is not available.

Figures

FIGURE 1. Morphological characters used for species description of the body parts of the freshwater crayfish genus Parastacus: A—­ habitus; B—­ Cephalon lateral view; C—­ first to third pleonal pleurae; D—­ epistome; E—­ thoracic sternites; F—­ thoracomere 8 caudal view. a1 = antennule, a2 = antenna, als = anterolateral section, aml = anteromedian lobe, Are = areola, as = antennal scale, bcg = branchiostegal groove, bl = bullar lobes, cg = cervical groove, Ct = Cephalothorax, di = diaresis, end = endopod, exo = exopod, ey = eye, fg = female gonopore, lg = longitudinal groove, lp = lateral process, ls = lateral spine, mcp = male cuticle partition, mg = male gonopore, mk = median keel, np = nephropore, pcg = postcervical groove, pls = posterolateral section, pp = protopod, p1 (che) = pereopod 1 (cheliped), p2 = pereopod 2, p3 = pereopod 3, p4 = pereopod 4, p5 = pereopod 5, Pl = pleon, poc = post orbital carina, ra = rostral apex, rc = rostral carina, ro = rostrum, rs = rostrum spine, soa = suborbital angle, sb = sternopleural bridge, SI, II, III = pleonal somite I, II and III, Te = telson, uro = uropod, va = vertical arm.

FIGURE 2. Morphologicalcharacters used forspecies description of the appendages of the freshwatercrayfish genus Parastacus. A—­ antennal scale; B—­ mandible; C—­ third maxilliped, ventral view; D—­ cheliped, lateral view; E—­ cheliped, dorsal view; F—­ second pereiopod, lateral view; G—­ tailfan. ca = carpus, cd = crista dentata, cdc = cephalodistal cusp, cmp = cephalic molar process, cdc = cephalodistal cusp, da = dactylus, ddls = diaresis dorsolateral spines, dl = distal lobe, dm = distal margin, dpc = distoproximal cusp, dspa = dorsal surface of palm, en = endopod, enmc = endopod median carina, ex = exopod, exmc = exopod median carina, exls = exopod lateral spine, f = flagellum, ff = fixed finger, il = incisor lobe, im = inner margin, is = ischium, lg = longitudinal groove, lm = lateral margin, ls = lateral spine, me = merus, p = palp, pa = palm, pl = proximal lobe, pr = propodus, rt = row of tubercles, s = spine, se = setae, te = telson, t = tubercle, vspa = ventral surface of palm.

FIGURE 3. Parastacus pugnax (Poeppig, 1835)—­ Type of Astacus chilensis (MNHN-As 356).

FIGURE 4. Parastacus pugnax (Poeppig, 1835): A—­ habitus, dorsal view (UFRGS 726); B—­ cephalon, dorsal view (UFRGS 726); C—­ cephalon, lateral view (UFRGS 726); D—­ female pleonal somites, dorsal view (UFRGS 2407); E—­ first to third male pleonal pleura (UFRGS 726); F—­ first to third female pleonal pleura (UFRGS 2407); G—­ tailfan (UFRGS 726). Scale bars: A, E—­ 10 mm; B, C, D, F, G—­ 5 mm.