Parastacus laevigatus Buckup & Rossi, 1980

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 : 38-41

Parastacus laevigatus Buckup & Rossi, 1980

( Fig. 21–22 )

Parastacus laevigatus Buckup and Rossi, 1980: 677 , figs. 18, 21.—­ Hobbs 1989: 79, fig. 369; 1991: 801.—­ Boos et al. 2012: 1030.—­ Rogers et al. 2020: 879 (key), fig. 23.66B.—­ Huber et al. 2022: 276 (key).—­ De los Ríos-Escalante et al. 2022: 1129 (appendix), fig. 1i.—­ Huber et al. 2024: 14 (key).

Type locality. Joinville , Santa Catarina, Brazil ( Buckup & Rossi 1980) .

Type Material re-examined. Holotype. male, Brazil, Santa Catarina, Joinville, Estrada da Cidra , Chacara dos Ipês. 05/VIII/1961, coll. Rosenberg ( MNRJ 31135 ) . Paratypes. one female and five juveniles, same data as holotype ( MNRJ 31136 ) ; one female, Cubatão Grande, São Francisco do Sul , Santa Catarina, 25/IX/1959, coll. H. Stick ( MNRJ 31137 ) ; one female, Brazil ( UFRGS 2039 ) .

Material examined. Brazil: Santa Catarina —­ one ovigerous female (with three eggs), São Francisco do Sul , E. Gounelle, 1914 (MNHN-IU 2013-14858) .

Diagnosis and description. Buckup & Rossi (1980).

Remarks. The type material was apparently lost as pointed by Ludwig Buckup, but it was found in the UFRGS collection during the review of specimens. Apparently, this material was never deposited in the MNRJ collection by the original authors. It was send to MNRJ during the present study and received new catalog numbers. This species was never found again in nature since 1962 and it is probably extinct in nature (F. B. Ribeiro personal observation). Additional morphological characters not mentioned in previous descriptions include: eyes small ( Fig. 21A, B, C ); front narrow ( Fig. 21A, B ); epistome anterolateral section with a blunt conical projection ( Fig. 22A ); antennal scale lateral margin straight ( Fig. 22D ); antennule internal ventral border of basal article with one sharp spine ( Fig. 22A ); mandible with cephalic molar process molariform and caudal molar process unicuspidate, incisor lobe with eight teeth; the second tooth from the anterior are the largest ( Fig. 22E ); SLP4 close to each other, medial keel present and not inflated; SLP5 smallest separeted to each other, median keel present and not inflated; SLP6 larger than SLP4 and SLP5 with slightly concave dorsal surface, medial keel present and inflated; SLP7 largest and with slightly concave surface, median keel present and slightly inflated; SLP8 smaller than SLP 7, median keel absent, vertical arms of paired sternopleural bridges close to each, bullar lobes not visible ( Fig. 22B, C ); male cuticle partition present. This species is morphologically similar to P. pilimanus , P. fluviatilis and P. pilicarpus in having the chelipeds laterally flattened and with the cutting edge of the finger covered by tufts of long setae, but it can be distinguished from those species by the post orbital carinae being obsolete and the presence of the carpal spine.

Distribution. Brazil: state of Santa Catarina ( Buckup and Rossi, 1980).

Color of live specimens. Data not available.

Habitat and Ecology. Data not available

Figures

FIGURE 21. Parastacus laevigatus Buckup & Rossi 1980, holotype and paratypes: A—­ habitus, dorsal view (holotype, MNRJ 31135); B—­ cephalon, dorsal view (holotype, MNRJ 31135); C—­ cephalon, lateral view (holotype, MN UFRJ w/n); D—­ female pleonal somites dorsal view (paratype, MNRJ 31137); E—­ first to third male pleonal pleura (holotype, MNRJ 31135); F—­ first to third female pleonal pleura (paratype, MNRJ 31137); G—­ tailfan (holotype, MNRJ 31135). Scale bars: A—­ 10 mm; B, C—­ 2,5 mm; D, E—­ 5 mm.

FIGURE 22. Parastacus laevigatus Buckup & Rossi 1980, holotype and paratypes: A—­ epistome (holotype, MNRJ 31135); B—­ thoracic sternites and gonopores (holotype, MNRJ 31135); C—­ thoracomere 8, caudal view (holotype, MNRJ 31135); D—­ antennal scale, lateral view (paratype, MNRJ 31137); E—­ mandible (MN UFRJ w/n); F—­ third maxilliped, ventral view (paratype, MNRJ 31137); G—­ third maxilliped, dorsal view (paratype, MNRJ 31137); H—­ first pereiopod, lateral view (holotype, MNRJ 31135); I—­ first pereiopod, dorsal view (holotype, MNRJ 31135); J—­ second pereiopod, lateral view (holotype, MNRJ 31135). Scale bars: A, B, I—­ 5 mm; C—­ 3.33 mm; D—­ 1,5 mm; E—­ 1 mm; F, G—­ 2.5 mm; H, J—­ 10 mm.