Allinectes istiophorus Orr, 2025, new species
Year: 2025
Type: other
Abstract: Allinectes istiophorus, new speciesurn:lsid:zoobank.org:act: 9623EDD5-7495-40A6-93F1-896A0C103CB5 Sailfin Snailfish Figures 1, 2B, 4B, 5B, 6B; Tables 2 and 3 Careproctus ectenes, non Gilbert: Maslenikov et al. 2013: 14, fig. 2D (Alaska, new records).— Orr et al. 2014a: 166, table 2 (list of identifications).— Orr et al. 2014b: 20, table 1 (list of identifications).— Love et al. 2021: 136 (in part; checklist). Holotype. UW 117193, 94.3 mm, ripe female, Aleutian Islands, Seguam Pass, 52.3353°N, 172.7493°W, 459 m depth, 21 June 2006, F/V Gladiator, cruise 2006-01, haul 53, benthic bag, J. W. Orr. Paratypes. 87 specimens: 62.7–120.5 mm. Aleutian Islands: UW 202383 (out of 117193), 108 mm, same locality as holotype; UW 200693, 107 mm, ripe male, 52.3310°N, 172.7470°W, 447 m depth, 23 July 2002, F/ V Sea Storm, cruise 2002-01, haul 156, J.W. Orr; UW 200696, 92 mm, 53.1899°N, 169.8622°W, 404 m depth, 19 July 2002, F/ V Vesteraalen, cruise 2002-01, haul 195, benthic bag, R. N. Clark; UW 155355, 108 mm, CT scan, 52.4061°N, 170.5475°W, 408 m depth, 16 June 2006, F/ V Sea Storm, cruise 2006-01, haul 39, B. Knoth; UW 201411, 8, 100–118 mm, 52.3255°N, 172.7466°W, 457 m depth, 19 June 2004, F/ V Sea Storm, cruise 2004-01, haul 60, J. W. Orr; UW 200695, 110 mm, 52.4255°N, 170.5257°W, 400 m depth, 3 August 2002, F/ V Sea Storm, cruise 2002-01, haul 195, R. C. Harrison; UW 204155 (ex UW 201425), 105 mm, 52.3732°N, 171.3548°W, 330 m depth, 10 August 2002, F/ V Sea Storm, cruise 2002-01, haul 225; UW 200681, 6, 84–120 mm, 52.3334°N, 172.7459°W, 439 m depth, 22 June 2018, F/ V Ocean Explorer, cruise 2018-01, haul 52; UW 200687, 2, 100–110 mm, 52.2436°N, 171.7035°W, 418 m depth, 17 June 2016, F/ V Sea Storm, cruise 2016-01, haul 44, C. L. Conrath; UW 117487, 2, 94.5–103.1 mm, 52.4261°N, 170.5243°W, 403 m depth, 30 May 2000, F/ V Vesteraalen, cruise 2000-01, haul 46, benthic bag, W. C. Flerx; UW 117494, 118.3 mm, 52.3282°N, 172.7468°W, 450 m depth, 4 June 2000, F/ V Vesteraalen, cruise 2000-01, haul 67, W. C. Flerx; UW 117495, 3, 102.0– 120.5 mm, 52.3282°N, 172.7468°W, 450 m depth, 4 June 2000, F/ V Vesteraalen, cruise 2000-01, haul 67, W. C. Flerx; UW 117497, 81.4 mm, 51.9066°N, 176.6378°E, 376 m depth, 1 August 1997, F/ V Dominator, cruise 1997-01, haul 201, benthic bag, R. C. Harrison; UW 117522, 97.5 mm, 52.6520°N, 172.2511°W, 386 m depth, 5 June 2000, F/ V Dominator, cruise 2000-01, haul 79, benthic bag, J. W. Orr; UW 153151, 119 mm, 52.6453°N, 172.2730°W, 398 m depth, 26 June 2010, F/ V Sea Storm, cruise 2010-01, haul 68, benthic bag, J. W. Orr; UW 154887, 2, 92.1–96.3 mm, 52.9352°N, 169.3369°W, 399 m depth, 15 June 2014, F/ V Sea Storm, cruise 2014-01, haul 19, benthic bag, V. Simon; UW 200680, 5, 96–117 mm, 52.3334°N, 172.7459°W, 439 m depth, 22 June 2018, F/ V Ocean Explorer, cruise 2018-01, haul 52; UW 200690, 3, 78–97 mm, 53.0972°N, 171.7007°E, 464 m depth, 1 August 2004, F/ V Gladiator, cruise 2004-01, haul 227, R. N. Clark; UW 200693, 4, 81.8–110.0 mm, 52.331°N, 172.7470°W, 447 m depth, 23 July 2002, F/ V Sea Storm, cruise 2002-01, haul 156, J. W. Orr; UW 200988, 98 mm, 52.2440°N, 171.6998°W, 394 m depth, 6 August 2002, F/ V Sea Storm, cruise 2002-01, haul 211, R. C. Harrison; UW 201094, 110 mm, 56.1903°N, 169.4878°W, 482 m depth, 16 July 2002, F/ V Morning Star, cruise 2002-02, haul 120, D. E. Stevenson; UW 201178, 62.7 mm, 51.9438°N, 178.0691°E, 435 m depth, 6 July 2002, F/ V Sea Storm, cruise 2002-01, haul 99, benthic bag, J. W. Orr; UW 117499, 90 mm, 53.0953°N, 171.6970°E, 465 m, 4 August 1997, F/ V Vesteraalen, cruise 1997-01, haul 220, J. W. Orr; UW 116041, 2, 96.8–101.3 mm, 52.2172°N, 171.6353°W, 453 m depth, 16 June 2004, F/ V Sea Storm, cruise 2004-01, haul 44, J. W. Orr; UW 116042, 12, 68–113 mm, 52.3405°N, 172.7455°W, 448 m depth, F/ V Morning Star, cruise 2002-01, haul 32, J. W. Orr; UW 116234, 3, 99.6–112.0 mm, 52.4873°N, 172.5612°W, 411 m depth, 22 June 2006, F/ V Gladiator, cruise 2006-01, haul 56, J. W. Orr; UW 117236, 98.0 mm, 52.2456°N, 171.6994°W, 409 m depth, 17 June 2006, F/ V Gladiator, cruise 2006-01, haul 40, benthic bag, J. W. Orr; UW 150772, 105 mm, 52.3278°N, 172.7467°W, 450 m depth, 26 June 2010, F/ V Sea Storm, cruise 2010-01, haul 64, benthic bag, J. W. Orr; UW 150774, 120 mm, 52.3278°N, 172.7467°W, 450 m depth, 26 June 2010, F/ V Sea Storm, cruise 2010-01, haul 64, J. W. Orr; UW 200700, 75.6 mm, 52.4094°N, 170.6192°W, 319 m depth, 3 August 2002, F/ V Sea Storm, cruise 2002-01, haul 198, R. C. Harrison; Bering Sea: UW 200684, 100 mm, 56.1003°N, 168.5398°W, 451 m depth, 2 July 2010, F/ V Vesteraalen, cruise 2010-01, haul 126, S. Kotwicki; UW 157982, 107 mm, 56.1652°N, 169.3980°W, 629 m depth, 6 July 2012, F/ V Vesteraalen, cruise 2012-01, haul 110, S. Kotwicki; UW 159980, 98 mm, 56.1417°N, 169.4517°W, 630 m depth, 1 March 2009, R / V Oscar Dyson, cruise 1DY09/12/2/NOR, haul 1; UW 118635, 110 mm, 57.8157°N, 173.8599°W, 524 m, 26 June 2008, J. W. Orr, F/ V Vesteraalen, cruise 2008-01, haul 67; UW 116032, 104 mm, 56.1913°N, 169.4864°W, 485 m depth, 20 July 2004, F/ V Northwest Explorer, cruise 2004-01, haul 158, J. W. Orr; UW 200689, 91.1 mm, 56.1904°N, 169.4873°W, 487 m depth, 20 July 2016, F/ V Cape Flattery, cruise 2016-01, haul 122, N. E. Roberson; UW 200682, 89.1 mm, 56.1233°N, 168.7844°W, 563 m depth, 1 July 2010, F/ V Vesteraalen, cruise 2010-01, haul 121, S. Kotwicki; UW 200688, 99.7 mm, 56.1384°N, 169.4461°W, 638 m depth, 19 July 2016, F/ V Cape Flattery, cruise 2016-01, haul 120, N. E. Roberson; UW 201522, 90 mm, 56.0686°N, 168.7603°W, 762 m depth, 17 July 2016, F/ V Cape Flattery, cruise 2016-01, haul 112, N. E. Roberson; UW 119724, 90 mm, 56.2033°N, 169.247°W, 498 m depth, 5 October 2007, R / V Miller Freeman, cruise 2007-12, haul 3, D. E. Stevenson; SIO 94 -198, 3, 104.0– 116.5 mm, 52.3217°N, 172.7450°W, 458 m depth, 16 June 1994, F/ V Pacific Knight, cruise 1994-01, haul 54, W.C. Flerx; SIO 94 -199, 112.8 mm, 52.4945°N, 172.5597°W, 470 m depth, 16 June 1994, F/ V Pacific Knight, cruise 1994-01, haul 55, W. C. Flerx; UAM:Fish 4094 (ex UW 204156), 2, 96.4–101.6 mm, 52.9218°N, 169.3647°W, 406 m depth, 16 June 2018, F/ V Sea Storm, cruise 2018-01, haul 22, P. Von Szalay; UAM:Fish 4095 (ex UW 200986), 80 mm, 52.3778°N, 170.5854°W, 368 m depth, 3 August 2002 -01, F/ V Sea Storm, cruise 2002-01, haul 197, R. C. Harrison. Diagnosis. Distinguished from all other species of Allinectes by the combination of its extremely elongate anterior dorsal-fin rays, dark stomach, and black peritoneum. Most similar to A. busbyi, new species, from which it differs in its rounded snout (vs. strongly protruding snout in A. busbyi, new species), longer anterior dorsal-fin rays (65.0–102.7% vs. 60.5% HL), larger orbit (length 27.5–34.2% vs. 26.1% HL), shorter postorbital length (32.2–42.4% vs. 44.1% HL), and more slender caudal-fin base (8.0–14.3% vs. 14.7% HL). Differing from A. nanstanorum, new species, in its longer anterior dorsal-fin ray (65–102.7% vs. 28.7–33.0% HL in A. nanstanorum, new species), caudal fin truncate or slightly emarginate (vs. dorsalmost caudal-fin ray longer and thicker), higher count of pectoral-fin rays (32–37 vs. 30–31), body overall light-red (vs. dark red and black), stomach dark (vs. pale), and abdomen white (vs. dark). Differing from A. ectenes in peritoneum black (vs. pale in A. ectenes), fewer vertebrae and median-fin rays (48–51 vs. 54 vertebrae, 43–47 vs. 48–51 dorsal-fin rays, and 38–41 vs. 44 anal-fin rays), narrower head (44.2–58.6% vs. 61.5% HL), and typically larger pelvic disk (29.7–41.4% vs. 30.8% HL). Differing from A. curilanus in having snout tip slightly protruding beyond lower jaw (vs. strongly protruding snout tip), caudal fin longer (49.2–66.3 vs. 33.8–50.9% HL), and fewer vertebrae (48–51 vs. 53–59 in A. curilanus) and median-fin rays (dorsal 43–47 vs. 48–54; anal 38–41 vs. 42–49). Similar to A. attenuatus, known only from holotype, differing in having fewer dorsal-fin rays (43–47 vs. 48 in A. attenuatus), deeper body at anal-fin origin (50.2–82.1% vs. 38.8% HL), longer pre-anal-fin length (33.9–41.6% vs. 32.4% SL), and anus closer to disk (3.2– 17.4% vs. 24.7% HL) and farther from anal-fin origin (49.3–75.6% vs. 29.4% HL). Further distinguished from A. pycnosoma by its strongly notched pectoral fin with long lower lobe (vs. shallow notch, with short lower lobe in A. pycnosoma), shorter head (19.8–24.8% vs. 26.9% SL), and anus far from pelvic disk (3.2–17.3% vs. 25.7% HL). Description. Body elongate, slightly tapered, rounded anteriorly, compressed posteriorly; depth at pelvic disk 44.2–76.8 (55.9)% HL; depth at anal-fin origin 50.2–82.1 (60.7)% HL. Head moderately small, 19.8–24.8 (22.4)% SL, width 44.3–58.6 (51.2)% HL; broadly depressed, nape slightly elevated. Snout typically longer than orbit, 88.3–129.6 (118.0)% OL, 27.2–36.7 (34.1)% HL, slightly rounded, snout tip slightly projecting anterior to lower jaw, 0–7.7 (7.1)% HL. Mouth inferior; upper jaw 33.4–43.9 (37.0)% HL, maxilla extending to mid-orbit, oral cleft extending to anterior rim of orbit; mandible 41.1–51.8 (44.1)% HL. Premaxillary tooth plates matching mandibular tooth plates. Premaxillary and mandibular teeth trilobed in 7–9 oblique rows of 7–8 teeth forming moderately wide bands. Diastema absent at symphyses of upper and lower jaws. Orbit length 27.5–34.2 (28.9)% HL, orbit depth 19.3–30.6% HL, dorsal margin below dorsal contour of head, suborbital depth to upper jaw 7.9–16.6 (14.2)% HL, to lower jaw 19.5–25.9 (21.8)% HL; pupil round. Interorbital space convex, broad, fleshy distance 23.2–39.4 (30.3)% HL, bony distance 16.3–25.0 (19.9)% HL. Nostril single, with well-developed tube at level with upper part of orbit; nostril tube length 6.4–22.5 (13.1)% OL. Free neuromasts often evident in preserved specimens: at least four or five extending posteriorly from suprabranchial pore 2. In one specimen (UW 116234), about 28 pores extend to form arch over pectoral fin, curving ventrally to midbody
Author: Orr, James Wilder
Language: English
Subfield: Aquatic Science
Domain: Life Sciences
Open Access status: green
OpenAlex ID: W6893307776
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