Squalus bahiensis De, De & Gomes, 2016, sp. nov.
Squalus bahiensis sp. nov. (Figs. 26–33; Tables 7–8) Suggested common names: Northeastern Brazilian dogfish; Cação-bagre-da-Bahia (Portuguese). Squalus fernandinus (not Molina): Fowler, 1936: 71 (description; South Atlantic); Bigelow & Schroeder, 1948: 480 (revision; Brazil). Squalus cubensis (n...
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2016
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| Online Access: | https://dx.doi.org/10.5281/zenodo.6075730 https://zenodo.org/record/6075730 |
| Summary: | Squalus bahiensis sp. nov. (Figs. 26–33; Tables 7–8) Suggested common names: Northeastern Brazilian dogfish; Cação-bagre-da-Bahia (Portuguese). Squalus fernandinus (not Molina): Fowler, 1936: 71 (description; South Atlantic); Bigelow & Schroeder, 1948: 480 (revision; Brazil). Squalus cubensis (not Howell-Rivero): Kondyurin & Myagkov, 1984: 118 –120, fig. 1 B (revision; Western Atlantic); Nunan & Senna, 2007: 169, 170 (cited; Brazil). Squalus blainvillei (not Risso):? Lucena & Lucena, 1981: 2, 4, 5, fig. 3 (listed; Brazil);? Menni et al ., 1984: 84 (listed; Argentina, Uruguay);?Canizarro et al ., 1994: 113 (cited; Western Atlantic Ocean);?Nion et al ., 2002: 4 (listed; Uruguay);? Meneses & Paesch, 2003: 8, 25 (cited; Argentina, Uruguay);?Saéz et al ., 2010: 623 (identification key; Chile); Viana, 2011 (in part): 57–91, figs. 18–34 (revision; Brazil). Squalus mitsukurii (not Jordan & Snyder): Calderón, 1994: fig. 5 B (cited; Brazil);? Lessa et al ., 1999: 61, 150 (cited, listed; Northeast Brazil); Compagno, 2002: 385 (description; Northeast Brazil); Jablonski et al ., 2006: 177 (cited; Brazil); Louro & Rossi-Wongtschowski, 2007: 18, 27, 28, 30, 49 (cited; Brazil);?Fischer et al ., 2006: 495–501 (cited; Northeastern Brazil). Squalus sp. of the blainvillei group: Gomes et al ., 1997: 93 –95, 109 (listed; Brazil); Marques, 1999 (cited; Brazil). Squalus of the blainvillei / mitsukurii group: Gadig, 2001 (in part): 29, 36, 54, 55, 57, 58, fig. 29 (listed; Brazil). Squalus sp. B: Soto, 2001: 96 (listed; Brazil); Soto & Mincarone, 2004: 79 –82 (listed; Brazil). Squalus sp. 1: Gomes et al ., 2010: 44, 45 (cited; Brazil). Holotype . MNRJ 30180, adult male, 590 mm TL, Bahia coast, Brazil, 1548 ' 30 ''S, 3835 ' 16 ''W, 599 m. Collected on 12 June 2000, Station 0 510, Thalassa cruise, Revizee program. Paratypes (2 specimens) . MNRJ 30178, adult male, 615 mm TL, 599 m; MNRJ 30179, adult male, 690 mm TL, 599 m. Same locality as holotype. Diagnosis . Squalus bahiensis sp. nov. is distinct from all species of the S. megalops group by having pectoral fins with free rear tips rounded ( vs . free rear tips pointed), snout blunt and elongate ( vs . snout rounded and short), and dermal denticles tricuspid and rhomboid ( vs . dermal denticles unicuspid and lanceolate). Squalus bahiensis sp. nov. is distinct from S. mitsukurii by having a narrower interorbital space (8.2 %, 7.9 %– 8.3 % TL vs . 9.3 %, 9.1 %– 9.8 % TL in S. mitsukurii ), and shorter lower caudal fin lobe (preventral caudal margin 11.4 %, 10.9 %– 11.3 % TL vs . 12.1 %, 11.5 %– 12.4 % TL). Squalus bahiensis sp. nov. can be easily distinguished from S. blainvillei from the Mediterranean Sea by having lower dorsal fins (first dorsal-fin height 6.9 %, 7.0%– 7.1 % TL vs . 8.2 %, 7.3 %– 8.7 % TL in S. blainvillei second dorsal-fin height 5.3 %, 4.2 %– 4.4 % TL vs . 7.2 %, 6.6 %– 7.5 % TL in S. blainvillei ), and a shorter upper labial furrow (its length 2.3 %, 2.2 % TL vs . 2.5 %, 2.4 %– 2.7 % TL in S. blainvillei ). Squalus bahiensis sp. nov. is distinct from S . lobularis by: caudal fin somewhat slender vs . upper caudal lobe rectangular in S . lobularis second dorsal-fin spine not reaching dorsal-fin apex vs . reaching dorsal-fin apex in S . lobularis shorter pectoral-fin inner margin (its length 8.1 %, 8.4 %– 8.9 % TL vs . 10.5 %, 9.2 %–11.0% TL in S . lobularis ); and clasper outer length greater (5.0%, 4.6 %– 5.1 % TL vs . 4.3 % TL in S . lobularis ). Description. External morphology . Measurements and meristic data are summarized in Tables 7–8. Body slender and fusiform, arched dorsally and somewhat flattened ventrally; its greatest depth at head and abdomen (head height 9.3 %, 9.6 %–10.0% TL; abdomen height 10.1 %, 9.6 %– 10.5 % TL) with head height corresponding to 0.9 (1.0–1.0) times trunk height and 0.9 (1.1 – 1.1) times abdomen height. Head rather elongate (length 21.4 %, 22.8 %– 22.9 % TL), narrower at nostrils (width 7.0%, 7.0%– 7.1 % TL), and much broader at gills (11.9 %, 12.4 %– 12.6 % TL). Snout markedly blunt and broad at tip (not obtuse) and elongate (preorbital length 7.3 %, 7.4 %– 7.9 % TL); anterior margin of nostrils bilobate, positioned laterally and nearer to the mouth than to snout tip (prenarial length 1.1, 1.0– 1.2 times inner nostril-labial length); prenarial length 1.4 (1.4 – 1.4) times eye length; internarial space 1.2 (1.3–1.4) times eye length. Eyes oval and horizontal, placed nearer to snout tip than to gill slits; its anterior margin convex and posterior margin notched; eyes large, their length 2.0 (1.9–2.7) times its height. Prespiracular length 12.2 % (12.2 %– 12.9 % TL), corresponding to 0.6 (0.5–0.6) times prepectoral length. Spiracles crescent-shaped, located more dorsally behind eyes; spiracle length 0.4 (0.3–0.5) times eye length. Prebranchial length 17.9 % (18.4 %– 18.8 % TL), corresponding to 1.5 (1.4–1.5) times prespiracular length. Gill slits vertical and low, fifth gill slit height 1.0 (1.1–1.2) times greater than first gill slit height; gill slits just anterior to pectoral fins. Preoral length 9.9 % (10.2 %– 10.5 % TL), corresponding to at least 1.4 times mouth width. Mouth arched and somewhat broad, its width 1.7 (1.5–1.6) times internarial space and 1.4 (1.4–1.5) times prenarial length; upper labial furrow long, its length 2.3 % (2.2 %– 2.2 % TL) with a slender fold; lower labial furrow also elongate, although without a fold. Teeth unicuspid, similar in both jaws, broad and compressed labial-lingually at crown, imbricate laterally; upper teeth smaller and narrower than lower teeth; cusp small and heavy, markedly oblique and upturned, directed laterally; mesial cutting edge conspicuously convex; mesial heel notched; distal heel strongly rounded; apron thick; two series of functional teeth on upper jaws of holotype and three series in paratypes; two series of functional teeth in lower jaws; tooth rows varying from 13–14 (13–14 paratypes) in upper jaw and 11–12 (11 – 11 paratypes) in lower jaw (Fig. 28). Pre-first dorsal fin length 29.9 % (29.7 %– 30.9 % TL), corresponding to 1.4 (1.3–1.4) times prepectoral length. Origin of first dorsal fin preceding pectoral free rear tips. First dorsal fin wide at fin web and rather large (Fig. 29), its length 12.8 % (13.8 %– 13.8 % TL), corresponding to 1.8 (1.9 –2.0) times its height; anterior margin convex and elongate, its length 10.5 % (10.3 %– 10.6 % TL); posterior margin markedly concave and large, its length 7.9 % (9.2 %– 9.6 % TL); first dorsal-fin apex strongly rounded and slender; first dorsal-fin free rear tip triangular; first dorsal-fin inner margin length 5.7 % (6.4 %– 6.9 % TL); first dorsal fin low, its height 6.9 % (7.0%– 7.1 % TL) and corresponding to 1.2 (1.0– 1.1) times its inner margin length, and 0.9 times preorbital length. First dorsal-fin spine slender and small, its length 2.8 % (2.9 %–3.0% TL) and corresponding to 0.4 times first dorsal-fin height, not reaching first dorsal-fin apex. First dorsal-fin length 1.1 times second dorsal-fin length. Interdorsal space 1.2 (1.1– 1.2) times prepectoral length and 2.4 (2.0– 2.4) times dorsal-caudal space. Pre-second dorsal fin length 2.8 times prepectoral length and 4.3 (4.2–4.4) times pectoral anterior margin length. Second dorsal fin slender, small, its length 11.6 % (12.1 %– 12.6 % TL) and 2.2 (2.8–2.9) times its height; anterior margin convex and short, its length 9.4 % (9.3 %– 9.7 % TL); posterior margin conspicuously concave and falcate, its length 5.0% (5.7 %– 5.7 % TL); second dorsal-fin apex rounded and lobe-like; second dorsal-fin free rear tip triangular; second dorsal-fin inner margin somewhat elongate, its length 5.3 % (5.6 %– 5.6 % TL); second dorsal fin also low, its height 1.0 (0.8 – 0.8) times its inner margin length. Second dorsal-fin spine thin and short, its length 0.8 (0.8 –1.0) times second dorsalfin height and 1.5 (1.2–1.5) times greater than first dorsal-fin spine; second dorsal-fin spine not reaching second dorsal-fin apex (Fig. 29). Prepectoral length 21.7 % (22.0%– 22.8 % TL). Pectoral fins markedly narrow and small (anterior margin length 14.3 %, 14.4 %– 14.5 % TL); anterior margin 1.8 (1.6–1.7) times greater in length than inner margin length and 1.4 (1.3–1.4) times posterior margin length; pectoral-fin anterior margin straight and posterior margin convex; inner margin markedly concave, its length 8.1 % (8.4 %– 8.9 % TL); pectoral-fin apex rounded and lobe-like; pectoral-fin free rear tips also rounded and lobe-like, reaching the horizontal line traced from pectoral fin apex (Fig. 27). Prepelvic length 44.4 % (45.5 %– 48.6 % TL). Pectoral-pelvic space 0.7 (0.8–0.9) times pelvic-caudal space. Pelvic fins also narrow, its anterior and posterior margins straight; pelvic-fin free rear tips slightly pointed, triangular and elongate, its length 5.8 % (5.1 %– 5.4 % TL). Origin of pelvic fins 2.8 (2.9 –3.0) times the distance between the origins of the two dorsal fins, closer to the first dorsal fin than to second dorsal fin in holotype (somewhat closer to midline between the origins of two dorsal fins in paratypes); pectoral-pelvic space short, its length 19.7 % (19.5 %– 20.3 % TL) and corresponding to 0.7 (0.7–0.8) times pelvic-caudal space. Claspers cylindrical and slender, compressed dorsoventrally; claspers large, extending far posterior to pelvic-fin free rear tips, its outer length among 5.0% (4.6 %– 5.1 % TL); clasper inner margin 1.3 (1.3–1.4) times greater in length than pelvic-fin inner margin; clasper groove longitudinal and very elongate, positioned dorsally; apopyle very narrow, located anteriorly in clasper groove; hypopyle also narrow, located posteriorly in clasper groove; rhipidion markedly large, blade-like and slender, placed medially at distal end of clasper (Fig. 30). Caudal peduncle with soft lateral caudal keels from opposite second dorsal-fin free rear tip to caudal fin origin; upper and lower caudal pits profound. Caudal fin with straight dorsal caudal margin, its length 21.9 % (20.0%– 21.4 % TL) and corresponding to 1.0 (0.9 in paratypes) times head length and 1.9 (1.8–1.9) times preventral caudal margin length; upper postventral caudal margins strongly convex (Fig. 31); lower postventral caudal margin convex; posterior caudal tip rounded; preventral caudal margin straight and short, its length 2.0 times (2.1 in paratypes) pelvic-fin inner margin length; ventral caudal tip also rounded; caudal fin narrow at lobes and conspicuously concave at caudal fork, its width 6.7 % (6.4 %– 7.1 % TL). Dermal denticles (Fig. 32). Description based on paratype MNRJ 30178. Denticles tricuspid and imbricate dermal denticles, very broad at crown, their length somewhat equal to their width; cusps triangular and wide with median cusp larger than lateral cusps; lateral cusps forming a right angle with median cusp; median anterior projection conspicuous and rounded with small posterolateral expansions on each side; median ridge conspicuous and bifurcate, forming a superficial furrow anteriorly, reaching the median cusp tip; two lateral ridges on each side of the denticle, thick and prominent, reaching the lateral cusp tips; lateralmost ridge often shorter than the medial ridge. In holotype, dermal denticles more slender and not imbricate; cusps very thin and cylindrical; lateral cusps forming a prominent concavity with the median cusp on each side. Coloration (Fig. 26). Body gray dorsally, white ventrally and on its posterior half. First dorsal fin gray, darker at apex and whitish at base; anterior margin slightly white on first half; posterior margin white. Second dorsal fin also gray and darker at apex; posterior margin slightly white. First and second dorsal-fin spines white, slightly gray anteriorly. Pectoral fins gray dorsal and ventrally, whitish at ventral base; pectoral-fin posterior margin uniformly white. Pelvic fins light gray dorsally and ventrally; pelvic-fin posterior margin white. Caudal fin dark gray, whitish over vertebral column; dorsal caudal margin white; upper and lower postventral caudal margins whitish; posterior caudal tip broadly white; ventral caudal tip also white; preventral caudal margin somewhat whitish; caudal stripe small and gray. Vertebral counts (Table 8). Monospondylous vertebrae 43 in holotype (43–45 in paratypes); precaudal vertebrae 87 (87); total vertebrae 117 (115–116). Geographical distribution (Fig. 33). Squalus bahiensis is apparently endemic to the coast near Salvador, Bahia (Brazil). Etymology . The epithet is in reference to the state of Bahia, northeastern Brazil, from where this species is described. Remarks . Squalus mitsukurii and the Mediterranean species S. blainvillei (Risso, 1826) are often listed in the literature from the northern Brazilian coast to southern Argentina (e.g. Miranda Ribeiro, 1907; Compagno, 1984; Calderón, 1994; Compagno et al ., 2005; Fischer et al ., 2006; Viana, 2011). These two species were probably misidentified in these regions for sharing characters of species of the S. mitsukurii group, such as an elongate snout, tricuspidate dermal denticles, and low dorsal fins, which are also present in both S . bahiensis and S. lobularis . Squalus bahiensis , however, can be easily distinguished from all species of this group by the absence of a black caudal blotch in the caudal fin. Squalus bahiensis further differs from S. lobularis (its most similar congener) by a shorter first dorsal-fin anterior margin (its length in S . bahiensis 10.5 %, 10.3 %– 10.6 % TL vs . 11.1 %, 10.3 %– 11.9 % TL in S. lobularis ), and greater interdorsal space (26.5 %, 24.4 %– 26.8 % TL vs . 24.6 %, 21.9 %– 24.1 % TL, respectively). Squalus bahiensis can also be distinguished from the Japanese S. mitsukurii by a more elongate precaudal length (79.5 %, 79.2 %– 81.2 % TL vs . 77.5 %, 76.9 %– 78.6 % TL in S. mitsukurii ), pre-second dorsal fin length (61.5 %, 61.0%– 63.8 % TL vs . 61.0%, 58.4 %– 60.5 % TL in S. mitsukurii ), and first gill slit closer to snout tip in S . bahiensis than in S. mitsukurii (prebranchial length 17.9 %, 18.4 %– 18.8 % TL vs . 20.4 %, 19.9 %–20.0% TL in S. mitsukurii ). Squalus bahiensis has a body depth almost equal from the head to abdomen (head height 0.9, 1.1 – 1.1 times trunk height, and 0.9, 1.0–1.0 times abdomen height) while S. mitsukurii has its greatest depth in the head (head height 1.2, 1.0– 1.4 times trunk height and 1.6, 1.2–1.7 times abdomen height). It is also easily distinct from S. montalbani by having a more slender and deep body (vs. markedly robust body in S. montalbani ), and a shorter ventral caudal lobe (its length 11.4 %, 10.9 %– 11.3 % TL vs . 11.5 %– 13.2 % TL in S. montalbani ). Squa'us Squa'us Hο Hο MNRJ MΖUSP bahiensis sp. nov. quasimodo sp. nov.Measurements1 οtypeParatypes1 οtypeParatypes30180NRangexSD118707N RangexSDΤL (mm)585.02615.0 - 690.0652.553.0700.03 660.0 - 830.0745.085.0PCL79.5279.2 - 81.280.21.482.93 78.5 - 80.179.40.8PD261.5261.0 - 63.862.42.063.63 60.1 - 62.361.51.2PD129.9229.7 - 30.930.30.832.93 28.4 - 31.830.31.7SvL47.0247.2 - 50.748.92.549.73 47.0 - 50.648.41.9PP244.4245.5 - 48.647.02.149.33 44.7 - 48.046.21.6PP121.7222.0 - 22.822.40.623.73 21.8 - 22.622.20.4HDL21.4222.8 - 22.922.80.124.73 22.2 - 23.022.60.4PG117.9218.4 - 18.818.60.320.73 17.4 - 19.218.51.0PSP12.2212.2 - 12.912.60.512.83 11.5 - 12.612.20.6PΟB7.327.4 - 7.97.70.37.93 6.8 - 7.77.40.5PRN5.024.9 - 5.15.00.14.83 4.5 - 4.94.70.2PΟR9.9210.2 - 10.510.30.210.23 9.5 - 10.09.70.3INLF4.624.2 - 4.94.60.54.73 4.0 - 4.74.50.4MΟW7.227.2 - 7.77.50.37.83 7.3 - 7.87.50.2ULA2.322.2 - 2.22.20.02.63 2.2 - 2.52.40.1INW4.224.7 - 4.84.80.15.03 3.9 - 4.14.00.1INΟ8.227.9 - 8.38.10.38.83 7.7 - 8.07.90.2EΥL3.623.5 - 3.83.60.23.53 3.1 - 4.94.20.9EΥH1.821.4 - 1.91.60.31.33 1.0 - 2.11.50.5SPL1.321.3 - 1.61.50.21.33 1.1 - 1.41.30.1GS11.721.6 - 2.01.80.32.03 1.7 - 2.01.80.2GS51.821.9 - 2.22.00.22.33 2.0 - 2.22.10.1IDS26.5224.4 - 26.825.61.726.43 24.0 - 25.824.90.9DCS11.2211.0 - 12.211.60.812.13 10.7 - 11.411.10.4PPS19.7219.5 - 20.319.90.522.13 20.0 - 22.921.61.5PCA27.4225.2 - 27.826.51.927.13 25.3 - 26.225.60.5D1L12.8213.8 - 13.813.80.013.73 13.3 - 14.313.70.5D1A10.5210.3 - 10.610.40.311.23 10.8 - 11.411.10.3D1B7.527.2 - 7.37.30.08.23 7.7 - 8.58.20.4D1H6.927.0 - 7.17.10.06.43 6.9 - 7.67.20.3D1I5.726.4 - 6.96.70.35.63 5.6 - 6.15.90.3D1P7.929.2 - 9.69.40.39.43 7.7 - 8.48.10.3D1ES2.822.9 - 3.02.90.14.33 3.3 - 4.33.90.5D1BS0.620.8 - 0.80.80.00.93 0.7 - 1.00.80.2D2L11.6212.1 - 12.612.40.412.03 11.1 - 12.512.00.8D2A9.429.3 - 9.79.50.39.73 8.1 - 10.69.61.3D2B6.226.6 - 6.86.70.27.53 6.7 - 8.07.30.6D2H5.324.2 - 4.44.30.14.03 4.7 - 5.35.00.3D2I5.325.6 - 5.65.60.04.53 4.6 - 4.94.70.2D2P5.025.7 - 5.75.70.05.73 5.1 - 5.45.20.2D2ES4.123.7 - 4.34.00.44.43 3.9 - 4.34.10.2D2BS0.820.7 - 0.90.80.11.03 0.8 - 0.90.80.1P1A14.3214.4 - 14.514.50.115.93 15.5 - 16.015.90.3P1I8.128.4 - 8.98.70.410.93 8.1 - 8.88.50.4P1B4.824.2 - 4.54.40.24.63 4.4 - 5.24.80.4P1P9.8210.5 - 11.310.90.512.33 10.2 - 12.511.21.2P2L10.5210.3 - 10.510.40.111.33 9.9 - 11.210.60.6P2I5.825.1 - 5.45.20.24.83 4.3 - 5.34.70.5CDM21.9220.0 - 21.420.71.019.73 20.2 - 21.320.60.6CPv11.4210.9 - 11.311.10.310.93 11.5 - 12.211.80.4CFW6.726.4 - 7.16.70.57.23 6.6 - 7.16.90.3HANW7.027.0 - 7.17.10.17.63 6.4 - 7.26.70.4HAMW10.7210.6 - 10.610.60.011.33 9.9 - 11.810.81.0HDW11.9212.4 - 12.612.50.216.13 12.2 - 13.512.90.7ΤRW9.329.9 - 11.010.40.813.73 9.3 - 11.310.21.0ABW7.728.4 - 8.98.60.39.63 6.3 - 10.48.92.3HDH9.329.6 - 10.09.80.311.33 8.9 - 10.49.60.7ΤRH9.829.1 - 9.59.30.311.63 8.5 - 12.310.12.0ABH10.129.6 - 10.510.00.612.83 8.2 - 12.611.12.5CLΟ5.024.6 - 5.14.80.4-- ---CLI7.526.6 - 7.57.00.6-- --- The longnose spurdog S. blainvillei (Fig. 34) was originally described from the temperate and tropical waters from the Eastern Atlantic Ocean and Mediterranean Sea (Risso, 1826). It is also known from the west coast of Africa, Gulf of Mexico, Caribbean Sea and, possibly, in the Pacific Ocean (Bigelow & Schroeder, 1948, 1957; Garrick, 1960; Bass et al ., 1976, 1986; Muñoz-Chápuli & Ramos, 1989), and is believed to have wide geographical distribution throughout the Atlantic Ocean (both sides). Type specimens of S. blainvillei are unknown, and its original illustration does not refer to any specimens used by Risso (1826) that could sugg : Published as part of De, Sarah T., De, Marcelo R. & Gomes, Ulisses L., 2016, Taxonomy and morphology of species of the genus Squalus Linnaeus, 1758 from the Southwestern Atlantic Ocean (Chondrichthyes: Squaliformes: Squalidae), pp. 1-89 in Zootaxa 4133 (1) on pages 45-56, DOI: 10.11646/zootaxa.4133.1.1, http://zenodo.org/record/400024 : {"references": ["Fowler, H. W. (1936) The marine fishes of West Africa based on the collection of the American Museum Congo expedition, 1909 - 1915. Part II. 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