Turris ambages Barnard, 1958
publication ID |
https://doi.org/ 10.11646/zootaxa.3244.1.1 |
DOI |
https://doi.org/10.5281/zenodo.5076841 |
persistent identifier |
https://treatment.plazi.org/id/03B6205D-7528-FFDE-DFD8-FE21FE311446 |
treatment provided by |
Plazi |
scientific name |
Turris ambages Barnard, 1958 |
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Turris ambages Barnard, 1958 View in CoL
Plate 2 View PLATE 2 , figs A–D
Turris ambages Barnard, 1958: 148 View in CoL , fig. 231; Powell 1964: 337; Barnard 1969: 604, figs 3a, b; Kensley 1973: 202, fig. 798; Kilburn 1983: 556, figs 2 (protoconch), 19–20 (holotype), 21. Type locality (designated Kilburn 1983): off O'Neil [Neill or Cunge] Peak, Zululand, 90 fath. [165 m].
DESCRIPTION: Shell medium-sized, b/l 0.29–0.31, a/l 0.30–0.45, suture relatively shallow, whorls gently convex, last whorl with a basal angle, subsutural cord low, usually shallowly bifid, weakly crenulate or finely pliculate, slightly weaker than sinus cord, sulcus deeply and narrowly channelled; sinus cord on shoulder, bearing a series of low, lunulate crenules or nodules (when fresh each with an oblique basal “tail”); anterior to sinus cord is a prominent, rounded peripheral cord, with sloping sides, and a weaker basal cord. Base of last whorl with wellspaced spiral cords and ridges, upper ones often coarsely nodose, becoming progressively weaker anteriorly, intermediary lirae few or absent. Anal sinus openly U-shaped and relatively shallow.
Yellowish-white, with irregular axial streaks and blotches of brownish-orange, particularly between the crenules.
Protoconch papilliform, of ca 2.5 whorls, the initial one blunt and relatively large; smooth with arcuate axial riblets near termination; diameter ca 1.25 mm.
Attains 50 mm.
DISTRIBUTION: Continental shelf and upper slope of KwaZulu-Natal and southern Mozambique, from Quissico south as far as the Natal /Transkei border, in about 38–165 metres, in sand pockets on low profile sandstone reefs.\
TYPES: Holotype SAMC A8685 .
OTHER MATERIAL EXAMINED (all NMSA, dredged RK et al., unless indicated otherwise): ZULULAND: S.E. of Durnford Point, 95 m, sponge rubble (E8611, E8434) and 100 m, mud and sponge rubble (E8634) . S.E. of Cape Vidal, 110 m, sponge rubble (E4924) . NATAL NORTH COAST: off Tongaat Bluff, 85 m, coarse sand (E9871) . NATAL SOUTH COAST: off Umlaas Canal, 128 m (B6310, B7938), and 135 m (B7939); dredged A. Connell ; N.E.. of Green Point, 75 m, coarse sand and rubble (D3978) , S.E. of Green Point, 100 m, fine sand and rubble (D3981) ; between Green Point and Widenham, 70 m, coarse sand and sponge (D3524) ; off Phumula, southern Natal, 44 m ( NMSA W7420) ; off Scottburgh, 100 m, (B3478: dredged A. Connell) ; off Park Rynie, 100 m, coral rubble (W400) . TRANSKEI: beach drift between Mzamba and Mtentu Rivers, don. J. Stannard (E6014) .
REMARKS: This uncommon south-east African endemic somewhat resembles T. ruthae and T. brevicanalis in its more or less crenulated sinus cord. T. ambages and T. ruthae are compared below. T. brevicanalis has more evenly convex whorls with more numerous, less close-set spiral ridges, of which the peripheral one is relatively weaker than in T. ambages .
NMSA |
KwaZulu-Natal Museum |
No known copyright restrictions apply. See Agosti, D., Egloff, W., 2009. Taxonomic information exchange and copyright: the Plazi approach. BMC Research Notes 2009, 2:53 for further explanation.
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Turris ambages Barnard, 1958
Kilburn, Richard N., Fedosov, Alexander E. & Olivera, Baldomero M. 2012 |
Turris ambages
Kilburn 1983: 556 |
Kensley 1973: 202 |
Barnard 1969: 604 |
Powell 1964: 337 |
Barnard 1958: 148 |