Okutanius ellenae, Kantor & Fedosov & Snyder & Bouchet, 2018

Kantor, Yuri I., Fedosov, Alexander E., Snyder, Martin Avery & Bouchet, Philippe, 2018, Pseudolatirus Bellardi, 1884 revisited, with the description of two new genera and five new species (Neogastropoda: Fasciolariidae), European Journal of Taxonomy 433, pp. 1-57 : 40-44

Okutanius ellenae gen. et sp. nov.

urn:lsid:zoobank.org:act:BF7E85A5-AC8A-4A6C-A7BA-671948DB2EE1

Figs 4H , 10

Diagnosis

Shell strong, slender, narrowly fusiform, up to 30 mm, protoconch of 3.75 whorls. Teleoconch whorls strongly convex, axial sculpture of broad, nearly orthocline, axial ribs, spiral sculpture of dense, evenly spaced, strong, raised cords. Aperture lirate inside, columella with weak columellar plicae to nearly smooth. Teleoconch with alternating white spiral cords and orange brown interspaces, and three white bands, one subsutural, one just below periphery of last whorl and one at tip of siphonal canal.

Molecular diagnosis

See Table 3.

Etymology

The specific epithet pays homage to Ellen Strong, in fitting tribute for this elegant and handsome species.

Type material

Holotype

NEW CALEDONIA: South of Ile des Pins, 22°53′ S, 167°35′ E, 376–390 m, expedition KANACONO, stn DW4677, sequenced ( MNHN IM-2013-68819).

Paratypes

NEW CALEDONIA: 1 sequenced specimen from the type locality ( MNHN IM-2013-68876); 2 specimens, 24°44′ S, 168°10′ E, 270–350 m, expedition BERYX 11, stn DW11 ( AMS C.572407 and NSMT-Mo 79000); 1 specimen, 22°58′ S, 167°33′ E, 410-440 m, expedition MUSORSTOM 4, stn DW222 ( ANSP 476089).

Sequenced material

NEW CALEDONIA: holotype and paratype, TERRASSES: 1 lv, stn DW3082, 22°29′ S; 167°23′ E, 290 m ( MNHN IM-2007-38356).

CORAL SEA: EBISCO: 1 lv, stn DW2520, Banc Kelso, 24°06′ S, 159°41′ E, 350–400 m (MNHN IM- 2007-32522).

Other material examined

CORAL SEA: MUSORSTOM 5: 2 dd, stn DW299, 22°48′ S, 159°24′ E, 360–390 m; 5 lv, 10 dd, stn DW300, 22°48′ S, 159°24′ E, 450 m; 18 dd, stn DW301, 22°07′ S, 159°25′ E, 487–610 m; 1 dd, stn DW304, 22°10′ S, 159°26′ E, 385–420 m; 2 dd, stn DW306, 22°08′ S, 159°21′ E, 375–415 m; 1 lv, 3 dd, stn DC362, 19°53′ S, 158°40′ E, 410 m.

NEW CALEDONIA: LAGON: 1 lv, stn 444, 18°15′ S, 162°59′ E, 300– 350 m. – BIOCAL: 1 dd, stn DW38, 23°00′ S, 167°15′ E, 360 m; 8 lv +dd, stn DW64, 24°48′ S, 168°09′ E, 250 m; 1 lv, 3 dd stn DW65, 24°48′ S, 168°09′ E, 245– 275 m. – BIOGEOCAL: 2 dd, stn KG252, 21°31′ S, 166°21′ E, 330 m; 5 dd, stn DW253, 21°32′ S, 166°29′ E, 310– 315 m. – SMIB 5: 1 lv, stn DW98, 23°02′ S, 168°16′ E, 335 m. – 1 dd, S. of Ile des Pins, 22°52′ S, 167°35.5′ E, 370 m ( AMS C324274). – BATHUS 2: 1 dd, stn DW731, 22°49′ S, 166°45′ E, 300– 370 m. – BATHUS 3: 1 dd, stn CP804, 23°41′ S, 168°00′ E, 244– 278 m. – MUSORSTOM 4: 1 lv, stn DW222, 22°58′ S, 167°33′ E, 410-440 m (paratype ANSP); 2 dd, stn DW234, 22°15′ S, 167°08′ E, 350– 365 m. – CHALCAL 2: 14 dd, stn DW69, 24°44′ S, 168°08′ E, 260 m; 1 lv, 3 dd, stn DW70, 24°46′ S, 168°09′ E, 232 m; 2 dd, stn DW71, 24°42′ S, 168°10′ E, 230 m; 1 dd, stn DW78, 23°41′ S, 168°00′ E, 233 m; 3 dd, stn DW79, 23°41′ S, 168°00′ E, 243 m, 3 dd. – BERYX 11: 30 lv +dd, stn DW11, 24°44′ S, 168°10′ E, 270–350 m; 5 spms, stn DW18, 24°48′ S, 168°09′ E, 250– 270 m. – HALICAL 1: 1 dd, stn 1–4, 18°53′– 18°56′ S, 163°24′ E, 350– 400 m. – LITHIST: 1 dd, stn CP10, 24°48′ S, 168°09′ E, 245–261 m; 3 dd, stn DW11, 24°47′ S, 168°08′ E, 254–283 m; 4dd, stn DW12, 24°46′ S, 168°08′ E, 235–280 m; 1 dd, stn DW13, 23°45′ S, 168°17′ E, 400 m. – NORFOLK 1: 15 lv + dd, stn DW1651, 23°27′ S, 167°50′ E, 276–350 m; 1 dd, stn DW1652, 23°26′ S, 167°50′ E, 290– 378 m; 3 dd, stn DW1653, 23°28′ S, 167°51′ E, 328–340 m; 1 dd, stn DW1654, 23°28′ S, 167°52′ E, 366–560 m; 1 lv, 2 dd, stn DW1658, 23°26′ S, 167°50′ E, 320–336 m; 1 dd, stn DW1672, 23°43′ S, 168°01′ E, 267–324 m; 2 dd, stn DW1673, 23°39′ S, 168°00′ E, 278 m; 1 dd, stn DW1674, 23°40′ S, 168°00′ E, 245–253 m; 3 dd, stn DW1675, 24°45′ S, 168°09′ E, 231–233 m; 27 lv + dd, stn DW1679, 24°43′ S, 168°10′ E, 298–324 m; 1 dd, stn DW1680, 24°45′ S, 168°10′ E, 385–392 m; 4 dd, stn DW1704, 23°45′ S, 168°16′ E, 400–420 m; 6 dd, stn DW1707, 23°43′ S, 168°16′ E, 381–493 m; 3 dd, stn DW1709, 23°42′ S, 168°16′ E, 380–389 m; 1 dd, stn DW1710, 23°44′ S, 168°17′ E, 386–426 m; 1 dd, stn DW1722, 23°18′ S, 168°01′ E, 540 m; 8 lv + dd, stn DW1723, 23°18′ S, 168°15′ E, 266–267 m; 6 dd, stn DW1729, 23°20′ S, 168°16′ E, 340–619 m; 2 dd, stn DW1732, 23°20′ S, 168°16′ E, 347–1063 m.

VANUATU: VOLSMAR: 2 dd, stn DW07, 22°26′ S, 171°44′ E, 325–400 m; 1 dd, stn DW16, 22°25′ S, 171°41′ E, 420–500 m; 1 dd, stn DW39, 22°20′ S, 168°44′ E, 280–305 m; 1 dd, stn DW49, 21°00′ S, 170°04′ E, 285 m; 1 dd, stn DW50, 20°59′ S, 170°04′ E, 425 m. – MUSORSTOM 8: 1 dd, stn DW967, 20°19′ S, 169°53′ E, 295– 334 m.

TONGA: BORDAU 2: 2 dd, stn DW1607, 22°15′ S, 175°23′ W, 356– 367 m.

Description

Shell thin, slender, fusiform, consisting in holotype of 3.75 protoconch and 7 teleoconch whorls. Protoconch conical ( Fig. 10C ), with weakly convex whorls, last ½ whorl with 6 axial riblets, protoconch/ teleoconch discontinuity distinct. Protoconch diameter 1070 µm, exposed height 1110 µm. Teleoconch whorls convex, suture deep, adpressed. Axial sculpture of broad, prominent ribs, aligned axially on spire from one whorl to the next, 6 ribs per whorl. Spiral sculpture of evenly spaced, strong, raised cords, in holotype 2 on first whorl, 3 on subsequent whorls, abapicalmost stronger, 5 on antepenultimate and penultimate whorls, 22 on last whorl. No second order axial or spiral sculpture. Siphonal canal open, long, slightly recurved.Aperture with 11 weak lirae inside, base of siphonal canal not clearly demarcated. Inner lip completely adherent to columella, forming smooth, white, shiny columellar shield, with three weak columellar plicae. No umbilicus. Colour of protoconch and interior of aperture white or fleshcoloured. Teleoconch with alternating white spiral cords and orange brown interspaces, and three white bands, one subsutural, one just below periphery of last whorl and one at tip of siphonal canal.

Holotype measurements: SL 22.7, LWL 15.4 mm, AL (without canal) 5.7 mm, SW 7.8 mm.

Live animal has orange body ( Fig. 10D ) with irregular white spots, more numerous on body than on foot. Operculum transparent, yellow, with terminal nucleus shifted leftwards, closing aperture completely.

Radula ( Fig. 4H ) examined in two specimens from Norfolk Ridge (NORFOLK 1, stn DW1658, and stn DW1679), very similar in both specimens. Radula narrow, distance between outer edges of lateral teeth about 80 µm (1.6% of AL). Lateral teeth medium broad, arcuate, with attenuated outer anterior corner, producing medium long ‘handle’. Lateral teeth with outermost small cusp, on most rows overlaid by following major cusp and not seen on ventral view (marked by white arrow), five slightly recurved, short cusps, subequal in length, outer more distant from others, and one additional innermost short, but distinct, cusp. Central tooth small, trapezoid, with three short cusps, central longest. Narrow but distinct transverse folds of the membrane situated serially between rows of lateral teeth, reaching upper corners of central teeth.

Distribution

Coral Sea, New Caledonia to Tonga, in 245–610 m, alive in 245– 450 m.

Remarks

Okutanius ellenae gen. et sp. nov. reaches 29.6 mm in length, showing little variation in shell shape and colouration. It resembles O. kuroseanus gen. et comb. nov., but is easily separated by its sculpture of even spiral cords and distinct colour pattern of alternating white cords and dark interspaces. O. kuroseanus gen. et comb. nov. reaches a much larger adult size, and is also broader at comparable size. O. ellenae gen. et sp. nov. also superficially resembles Granulifusus tatianae gen. et sp. nov., which differs by its short siphonal canal, strong apertural barriers, and the presence of second order spiral and axial sculpture.

Figures

Fig. 4. Radulae of species of Granulifusus and Okutanius gen. nov.A. Granulifusus discrepans (Kuroda & Habe, 1961), shell, see Fig. 3D (MNHN IM-2013-46327). B. Granulifusus williami (Poppe & Tagaro, 2006), comb. nov., shell, see Fig. 3H (MNHN IM-2013-58726). C–D. Granulifusus jeanpierrevezzaroi (Cossignani, 2017) comb. nov., shell, see Fig. 5B–D, arrow points to regularly spaced folds of the radular membrane (MNHN IM-2007-34593). E. Granulifusus annae sp. nov., New Caledonia, BATHUS 1, stn CP669, 20°57′ S, 165°35′ E, 255–280 m, shell, see Fig. 6F. F. Granulifusus tatianae sp. nov., Loyalty Ridge, MUSORSTOM 6, stn DW473, 21°09′ S, 167°55′ E, 236 m. G. Okutanius kuroseanus (Okutani, 1975) gen. et comb. nov., New Ireland, shell, see Fig. 9A (MNHN IM-2013-59070). H. Okutanius ellenae gen. et sp. nov., New Caledonia, NORFOLK 1, stn DW1658, 23°26′ S, 167°50′ E, 320–336 m, shell, see Fig. 10H).

Fig. 10. Okutanius ellenae gen. et sp. nov. A–D. Holotype, New Caledonia, South of Ile des Pins, 22°53′S, 167°35′ E, 376–390 m, SL 22.7 mm, sequenced specimen (MNHN IM-2013-68819). E. Paratype from the type locality, SL 21.4 mm, sequenced specimen (MNHN IM-2013-68876). F. New Caledonia, SMIB 5, stn DW98, 23°02′ S, 168°16′ E, 335 m, SL 17.3 mm. G. New Caledonia, BATHUS 3: stn CP804, 23°41′ S, 168°00′ E, 244–278 m, SL 20 mm. H. New Caledonia, NORFOLK 1, stn DW1658, 23°26′ S, 167°50′ E, 320–336 m, SL 17.8 mm, radula, see Fig. 4H. I. New Caledonia, CHALCAL 2, stn DW79, 23°41′ S, 168°00′ E, 243 m, SL 24.4 mm. J. New Caledonia, SMIB 5, stn DW98, 23°02′ S, 168°16′ E, 335 m, SL 15.5 mm. K–L. New Caledonia, BATHUS 2, stn DW731, 22°49′ S, 166°45′ E, 300–370 m, SL 29.6 mm. All shells at the same scale.