Leucosyrinx truwalamuka Kantor, Hallan & Criscione, 2022

Kantor, Yuri I., Fedosov, Alexander & Puillandre, Nicolas, 2025, Revision of the Indo-Pacific species of the genus Leucosyrinx Dall, 1889 (Neogastropoda: Conoidea: Pseudomelatomidae), European Journal of Taxonomy 999, pp. 1-126 : 53-55

Leucosyrinx truwalamuka Kantor, Hallan & Criscione, 2022

Figs 15E , 18F–J

Leucosyrinx truwalamuka Kantor, Hallan & Criscione, 2022: 243 , fig. 10a–g.

Type material

Holotype

AUSTRALIA • Tasmania, Baseline _14; 44°06.6′ S, 146°12.6′ E; depth 965– 941 m; IN2018_V06_094; AMS C.557045.

Material examined

Total 6 specimens, 5 sequenced (detailed data see Kantor et al. 2022: 243).

Description

SHELL. Medium-sized, reaching 31 mm, narrow fusiform, with very high spire, light tan. Paucispiral protoconch of about 1.75 rounded whorls. Teleoconch whorls convex, with indistinct shoulder, upper whorls somewhat angular on shoulder, subsutural ramp weakly concave, nearly flat. Impressed shallow suture. Strong, oblique, opisthocline axial folds on and below shoulder, 16–17 on last to anterpenultimate whorls, reaching lower suture on upper whorls and extend to shell base on last whorl. Very weak sculpture of similar in width, low, rounded cords seen only on some parts of shell and canal, present on subsutural ramp. Shell base medium convex, rapidly passing into short straight canal. Narrow elongate-oval aperture, poorly differentiated from canal. Well-developed columellar and parietal callus of same color as remaining last whorl. Medium deep, subsutural, broadly arcuate anal sinus extends across subsutural ramp, confluent with large forward extension of outer lip.

RADULA ( Fig. 15E ; studied in holotype AMS C.557045). Long, comprising 46 rows of teeth, 17 nascent. Marginal teeth duplex, ~230 µm in length (2.6% AL without canal). Major limb medium broad lanceolate in dorsal view, curved. Accessory limb constitutes about half of tooth width, inserted into shallow socket on dorsal side of major limb.

DNA diagnosis (based on 3 cox 1 sequence)

‘C’ in site 34, ‘G’ in site 100, ‘C’ in site 259.

Remarks

The shells of younger specimens resemble Leucosyrinx jeedara in having a somewhat more angular whorl profile and, in some cases, more developed spiral sculpture.

Distribution

Off Tasmania, 965–1218 m.

Figures

Fig. 15. Radulae of species of Leucosyrinx Dall, 1889. A. L. margaritae (E.A. Smith, 1904), MNHN- IM-2009-13446, SL 40.9 mm. B. L. margaritae, MNHN-IM-2013-19931, SL 27.5 mm. C. L. zahariasi sp. nov., MNHN-IM-2013-69116, SL 15.8 mm (AL 4.4). D. L. jeedara Kantor, Hallan & Criscione, 2022, holotype, AMS C.483810, SL 31.3 mm. E. L. truwalamuka Kantor, Hallan & Criscione, 2022, holotype, AMS C.557045, SL 30.9 mm. F. Leucosyrinx sp. 21, MNHN-IM-2009-13324, SL 27.5 mm. G. L. herosae sp. nov., MNHN-IM-2009-17089, SL 32.2 mm. H. L. bourgeoisae sp. nov., holotype, MNHN-IM-2013-19785, SL 32.1 mm. I. Leucosyrinx sp. 1, MNHN-IM-2013-66109, New Caledonia, 700–740 m, SL 28.2 mm. Scale bars = 100 µm.

Fig. 18. A–E. Leucosyrinx jeedara Kantor, Hallan & Criscione, 2022. A–C. Holotype, AMS C.483810, Australia, Great Australian Bight, 1350–1321 m, SL 31.3 mm. D. Paratype, AMS C.571741, Australia, Great Australian Bight, 1509–1544 m, SL 25.6 mm. E. Paratype, AMS C.571740, Australia, Great Australian Bight, 1350–1321 m,SL 28.1 mm.F–J. Leucosyrinx truwalamuka Kantor, Hallan & Criscione, 2022. F–H. Holotype, AMS C.557045, Australia, Tasmania, 965–941 m, SL 30.9 mm. I–J. Paratype, TMAG E59172, Australia, Tasmania, 965–941 m, SL 33.2 mm. All shells at the same scale.