Serrapinnus lucindai Jerep & Malabarba

Malabarba, Luiz R. & Jerep, Fernando C., 2014, Review of the species of the genus Serrapinnus Malabarba, 1998 (Teleostei: Characidae: Cheirodontinae) from the rio Tocantins-Araguaia basin, with description of three new species, Zootaxa 3847 (1), pp. 57-79: 64-67

publication ID

http://dx.doi.org/10.11646/zootaxa.3847.1.3

publication LSID

lsid:zoobank.org:pub:93242732-2B5A-4083-8EC5-6FA53BD83E7D

DOI

http://doi.org/10.5281/zenodo.5117719

persistent identifier

http://treatment.plazi.org/id/03BCEF20-EC07-FF90-FF68-FF1FFE004413

treatment provided by

Felipe

scientific name

Serrapinnus lucindai Jerep & Malabarba
status

n. sp.

Serrapinnus lucindai Jerep & Malabarba   n. sp.

Figs. 2c–d View FIGURE 2 , 4b View FIGURE 4 , 5b View FIGURE 5 , 6 View FIGURE 6 , 7 View FIGURE 7

Holotype. UFRGS 19198 View Materials , 21 View Materials , 1 mm SL, Município de Piranhas, tributary of rio Piranhas , between Piranhas and Bom Jardim de Goiás, 16°21’43.3”S 51°55’10.2972”W, 7 Feb 2010, V. A. Bertaco, F. R. Carvalho & F. C. Jerep. GoogleMaps  

Paratypes. All from Brazil, rio Tocantins-Araguaia basin. Goiás State: UFRGS 12029 View Materials , 14 View Materials , 14.7–29.6 mm SL, Município de Aragarças , córrego Capivara , between Aragarças and Jussara, 15°54’34.5”S 52°5’34.6”W, 5 Feb 2010, V. A. Bertaco, F. R. Carvalho & F. C. Jerep. UFRGS 16444 View Materials , 7 View Materials , 22.5–26.3 mm SL, GoogleMaps   Município de Jussara , tributary of rio Claro , 15°58’0.0”S 50°48’59.7”W, 6 Feb 2010, V. A. Bertaco, F. R. Carvalho & F. C. Jerep. UFRGS 16445 View Materials , 35 View Materials , 15.3–25.2 mm SL, collected with holotype. GoogleMaps   Tocantins State: UFRJ 2128, (3, 19.6–22.8 mm SL), Ilha do Bananal , Fazenda Canguçu , margin of rio Javares , 17 Feb 1994, W. Costa, G. Brasil & C. Campinha. UNT 4135 View Materials , 3 View Materials , 18.3–22.5 mm SL, Município de Brejinho de Nazar , córrego Sussuarana , 15 Feb 2002, NEAMB-UFT. UNT 4136 View Materials , 2 View Materials , 21.3–21.4 mm SL, Município de Guara , córrego Barreiro , 20 Oct 2000, NEAMB-UFT. UNT 4137 View Materials , 1 View Materials , 20.0 mm SL, Município de Lageado , rio Tocantins , close to UHE Lageado , rio Tocantins bottleneck, 27 Jan 2000, NEAMB-UFT. UNT 4745 View Materials , 1 View Materials , 25.3 mm SL, Município de Paraná , córrego Lageado , 7 Aug 2000, NEAMB-UFT. UNT 4759 View Materials , 5 View Materials , 16.1–19.7 mm SL, Município de Peixe , Fazenda Água Branca , lagoa Dionísio , 11 Sep 2001, NEAMB-UFT. UNT 6630 View Materials , 4 View Materials , 17.7–18.9 mm SL, Município de Tocantinópolis , córrego Santana , 29 Jun 2000, NEAMB-UFT. UNT 6927 View Materials , 1 View Materials , 21.7 mm SL, Município de Porto Nacional , rio Tocantins , 8 Oct 2002, NEAMB-UFT. UNT 7328 View Materials , (1, 25.6 mm SL), Município de Porto Nacional , Fazenda Don Augusto , rio das Éguas, 19 Sep 2002, NEAMB-UFT. GoogleMaps   Mato Grosso State: MCP 40302 View Materials , 44 View Materials , 10.7–27.9 mm SL, Município de Porto Alegre do Norte , rio Xavantino 16 km south of Porto Alegre do Norte in highway BR 158, 11°01’30’’S 51°38’47’’W, 27 Oct 2005, J. P. Silva. UFRGS 12020 View Materials , 7 View Materials , 23.5–24.7 mm SL, Mato Grosso, GoogleMaps   Município de Pontal do Araguaia , stream tributary of rio das Garças, 15°54’27.9”S 52°15’51”W, 8 Feb 2010, V. A. Bertaco, F. R. Carvalho & F. C. Jerep. UFRJ 1260, 58, 15.9–34.5 mm SL, (22, 22.1–34.5 mm SL, 4c&s 24.8–25.4 mm SL), creek 13 km west of rio das Mortes, left margin, between Água Boa and Cocalinho, 20 Feb 1993, W. Costa, C. Bore, R. Cunha & C. Muratori GoogleMaps   .

Diagnosis. Serrapinnus lucindai   is primarily distinguished from its congeners by the 17 to 19 ventral procurrent caudal-fin rays (vs. less than 17). Furthermore, the species can also be diagnosed from the remaining species of the genus by the presence of anal-fin hooks on the first unbranched and five branched rays of mature males (vs. anal-fin hooks on at least the anterior six branched rays on the remaining species of the genus), the absence of a continuous mid-lateral black stripe extending from the opercular region to the caudal-peduncle spot (vs. presence of a stripe in S. sterbai   ), the presence of 9 to 11 cusps on the premaxillary teeth (vs. 5 in S. microdon   and S. potiguar   , 7 in S. aster   , 7 to 9 in S. calliurus   , S. heterodon   , S. kriegi   , S. micropterus   , S. notomelas   and S. piaba   , and 10 to 12 in S. gracilis   and S. littoris   ), the dentary teeth without expanded cusps forming a sharp cutting edge and the incomplete lateral line (vs. dentary teeth with expanded cusps forming a sharp cutting edge and complete lateral line in S. heterodon   ), the hyaline dorsal fin (vs. fin with a proximal black blotch in S. notomelas   ), and an absence of a black spot in the posteroventral region of the abdomen (vs. the presence of a black spot in that region in S. kriegi   ).

Description. Morphometric data in Table 2. Body elongated and compressed. Greatest body depth at dorsal-fin origin. Dorsal profile of head strongly convex from tip of snout to vertical through anterior margin of anterior nares; gently convex from that point to base of supraoccipital process, then straight to slightly concave along length of supraoccipital process. Predorsal profile convex. Profile straight to slightly convex along dorsal-fin base. Dorsal profile from last dorsal-fin ray insertion to adipose fin slightly convex in immatures and females, deeply convex in adult males with ventrally arched caudal peduncle. Dorsal profile straight to slightly concave from end of adiposefin base to anteriormost dorsal procurrent caudal-fin ray. Ventral profile of head convex along anterior region of lower jaw, gently convex from that point to pelvic-fin insertion. Ventral region straight to slightly concave from pelvic-fin insertion to anal-fin origin in immatures and females, deeply concave in mature males. Anal-fin base slightly concave in immatures and females; conspicuously convex in mature males along anterior region supporting hypertrophied anal-fin rays and then straight posteriorly. Ventral profile of caudal-peduncle slightly concave in immatures and females, convex in mature males due to hypertrophied procurrent caudal-fin rays extending ventrally through muscle and skin. Caudal peduncle slightly longer than deep; ventrally arched in alcohol preserved mature males. Posterior margin of opercle sinusoidal with upper portion concave and lower portion convex. Mouth terminal; mouth slit on horizontal through middle of pupil. Maxilla angled posteroventrally; posterior tip falling short of vertical through anterior border of eye and horizontal through ventral border of eye. All teeth multicuspidate, pedunculate, compressed and distally expanded ( Fig. 7 View FIGURE 7 ). Premaxillary teeth 4(4), with 9 to 11 cusps; central cusp slightly longer and wider than lateral cusps. Two (3) or 3(1) maxillary teeth with 5 to 11 cusps. Large dentary teeth 4(2) or 5(2) with 7 to 9 cusps, followed by one (4) tooth with 5 cusps, and 1 to 3 smaller teeth with 1 to 3 cusps. Small lateral cusp of dentary teeth overlapping adjacent tooth cusps, other than on posterior teeth. All dentary tooth cusps pointed upward or slightly recurved towards interior of mouth.

Dorsal-fin rays ii,9*(31). Dorsal-fin origin slightly anterior to vertical through midlength of SL. First unbranched dorsal-fin ray about half length of second unbranched dorsal-fin ray. Second unbranched dorsal-fin ray longest in fin; branched rays slightly decreasing in size posteriorly. Adipose-fin origin on vertical through base of last anal-fin ray in females and posterior to that point in males. Anal-fin origin posterior to vertical through base of last dorsal-fin ray. Anal-fin rays iii*-iv,17*(2), 18(9), 19(13), 20(5) or 21(2). Distal border of anal-fin concave; last unbranched and anterior 5–8 branched rays longer than posterior rays. Tip of longest ray of depressed anal-fin of mature males falling short vertical through base of last anal-fin ray. Males with acute, elongate, retrorse hooks on distal half of anal-fin rays. Hooks posterolaterally arranged on last unbranched to 4 th or 5 th, rarely 7 th* (2) branched rays ( Fig. 4b View FIGURE 4 ). Two or three unpaired hooks per ray segment of each contralateral lepidotrichia. Hooks generally located on posterior margin of posterior branches of anal-fin rays. Hook bearing anal-fin ray segments and branches progressively fused in course of maturation of males. Mature males with hypertrophied soft whitish tissue on interradial membrane anterior to anal-fin hooks. Pectoral-fin rays i,9*(19) or 10(12). Tip of pectoral fin falling short of pelvic-fin origin in immatures and females, but extending beyond that point in mature males. Pelvic-fin rays i,6(3) or 7*(28). Pelvic-fin origin slightly anterior to dorsal-fin origin. Longest pelvic-fin ray falling short of anal-fin origin in immatures and females, but extending beyond that point in adult males. Males with one or two acute elongate and ventral-medially placed hooks per segment of lepidotrichia on branched pelvic-fin rays. One specimen with hook on unbranched pelvic-fin ray. Adult males with hypertrophied soft whitish tissue anterior to hooks on ventral surface of pelvic-fin. Principal caudal-fin rays 18(1), 19*(29) or 20(1). Procurrent caudal-fin rays: dorsal 12(1), 13(1), 14(1) or 15(1); ventral 17(1), 18(2) or 19(1). Adult males with ventral procurrent caudal-fin rays hypertrophied, typically fused to each other and distal tips extending through ventral muscles and skin of caudal-peduncle ( Figs. 2c View FIGURE 2 , 6 View FIGURE 6 ). Hypertrophied ventral procurrent caudal-fin rays elongated, rod-shaped, straight, proximally acute and round to flat distally.

Scales cycloid; similar in size over all of body. Lateral line partially pored with 8*(13), 9(13) or 10(5) pored scales and 31(6), 32*(12), 33(7) or 34(6) in lateral-line scale series. Predorsal series in regular row 10(3), 11*(21) or 12(7). Scale rows between lateral line and dorsal-fin origin 5*(27) or 6(4). Scale rows between lateral line and pelvic-fin origin 4*(28) or 5(3). Scale rows around caudal peduncle 12(5), 13(11) or 14*(15). Axillary scale on pelvic-fin base extending posteriorly for one or two scales. Scales along anal-fin base 9(1), 10(3), 11(15), 12(7), 13(3) or 14(1).

Counts based on four clear and stained specimens: Supraneurals 4(4); abdominal vertebrae 15(2) or 16(2); caudal vertebrae 17(2) or 18(2).

Color in alcohol. Overall ground coloration of body pale yellow; darker dorsally from head to end of caudal peduncle. Body with faint dark, rarely silver, midlateral stripe. Longitudinal stripe extending from region slightly anterior to vertical through dorsal-fin origin to light pigmented area preceding caudal spot. Scale series above longitudinal line with higher concentration of darker chromatophores. Abdominal region ventral to longitudinal line lighter. Caudal spot rounded and black, preceded by lightly pigmented area and situated over posterior portion of caudal peduncle and base of central portion of caudal fin, not reaching dorsal or ventral margins of caudal peduncle. Fins mostly hyaline with scattered, sparse dark chromatophores. Dorsal fin with higher concentration of dark chromatophores along unbranched and first branched rays. Adipose fin with few sparse dark chromatophores. Caudal fin with dark chromatophores along fin rays, except for clear areas at base of each caudal-fin lobe. Humeral region with triangular, dark area resulting from pseudotympanum within musculature ( Fig. 6 View FIGURE 6 ).

Sexual dimorphism. Mature males of S. lucindai   have caudal peduncle ventrally arched, as in other species of Serrapinnus   . Males also have hooks on the pelvic and anal-fin rays. The hook bearing anal-fin rays are hypertrophied, expanded in the sagittal plane, and commonly have the ray segments fused. The ventral procurrent caudal-fin rays of mature males are hypertrophied and extend ventrally beyond caudal peduncle muscle and skin ( Figs. 2c–d View FIGURE 2 , 4b View FIGURE 4 , 6 View FIGURE 6 ).

Distribution. Serrapinnus lucindai   is distributed in several tributaries of the rio Tocantins-Araguaia basin ( Fig. 5b View FIGURE 5 ).

Etymology. The species name lucindai   is in honor to the Brazilian ichthyologist Paulo Henrique Franco Lucinda (UNT), in recognition of his contribution to the taxonomy of Neotropical freshwater fish, mainly those of the rio Tocantins basin.

V

Royal British Columbia Museum - Herbarium

R

Departamento de Geologia, Universidad de Chile

MCP

Pontificia Universidade Catolica do Rio Grande do Sul