Leucosyrinx

Leucosyrinx verrilli, copyright Worldwide Conchology.

Belongs within: Conoidea.

Leucosyrinx is a genus of moderate-sized to large conoid gastropods found in deep ocean basins (Powell 1966).

Characters (from Powell 1966) Shell moderate- to large-sized, up to 73 mm, of light build, elongate-fusiform, with tall turreted or pagodiform spire, and long straight or slightly flexed, unnotched anterior canal. Protoconch small, globular, of 1.5–2 smooth whorls. Adult sculpture usually of axial nodes on peripheral angle, and plain spiral cords or threads on lower part of whorls. Sinus moderately deep, occupying whole of shoulder slope, apex broadly shallowly concave; subsutural marginal fold absent, sinus commencing at suture; sinus confluent below with considerable forward arcuate projection of outer lip, accentuating appearance of sinus depth. Colour pattern usually absent, occasionally axially flamed in reddish-brown; thin pale periostracum usually present. Operculum ovate to leaf-shaped, with terminal nucleus. Radula bearing a pair or marginal of modified wishbone-type, one of the two basal limbs being separated and superimposed upon larger element of tooth, which tapers to a simple point.

<==Leucosyrinx Dall 1889 P66
    |--*L. verrilli (Dall 1881) [=Pleurotoma (Pleurotomella) verrilli] P66
    |--L. amycus Dall 1919 O27
    |--L. caecilia Thiele 1925 P66
    |--L. elsa Thiele 1925 P66
    |--L. erna Thiele 1925 P66
    |--L. falklandica Powell 1951 P66
    |--L. galapagana Dall 1919 D19
    |--L. iwaensis MacNeil 1960 P66
    |--L. julia Thiele 1925 P66
    |--L. kincaidi Dall 1919 O27
    |--L. macrobertsoni Powell 1958 P66
    |--L. mawsoni Powell 1958 P66
    |--L. paragenota Powell 1951 P66
    |--L. pikei (Dell 1963) [=Waitara pikei] P66
    |--L. sansibarica Thiele 1925 P66
    |--L. sigsbeei (Dall 1881) [=Pleurotoma (Pleurotomella) sigsbeei] P66
    |--L. subgrundifera (Dall 1888) [=Pleurotoma subgrundifera] P66
    |--L. suratensis (Thiele 1925) [=Surcula suratensis] P66
    `--L. tenoceras Dall 1889 P66

*Type species of generic name indicated

REFERENCES

[D19] Dall, W. H. 1919. Descriptions of new species of mollusks of the family Turritidae from the west coast of America and adjacent regions. Proceedings of the United States National Museum 56 (2288): 1–86, pls 1–24.

[O27] Oldroyd, I. S. 1927. The Marine Shells of the West Coast of North America vol. II pt I. Stanford University Press: Stanford University (California).

[P66] Powell, A. W. B. 1966. The molluscan families Speightiidae and Turridae: an evaluation of the valid taxa, both Recent and fossil, with lists of characteristic  species. Bulletin of the Auckland Institute and Museum 5: 1–184, pls 1–23.