Revised descriptions of New Zealand Cenozoic Mollusca from Beu and Maxwell (1990)
(Pl. 36l): GS2877, J33/f7580, Lake Kaniere Road, Westland, Waipipian (GNS)
Beu & Maxwell (1990): Chapter 14; p. 290; pl. 36 l.
Synonymy: Turritella bicincta Hutton 1873b, p. 13 (not of S. V. Wood, 1842, nor of J. de C. Sowerby, 1850); Turritella ambulacrum "Sowerby" of Hutton 1886b, p. 355 (not of G. B. Sowerby I, 1846); Turritella huttoni Cossmann 1912, p. 113 (new name for Turritella bicincta Hutton, preoccupied); Zeacolpus (Stiracolpus) haweraensis Powell 1931a, p. 101; Turritella (Archimediella) huttoni; Zeacolpus (Stiracolpus) huttoni
Description: Small for family (13 to 19 mm high), tall and slender but variable in spire angle, many specimens rather broad compared with other Stiracolpus species (Pl. 47g); sculpture greatly dominated by 2 smooth spiral cords. Unlike almost all other Neogene turritellids of New Zealand, only spiral cords A and B are strongly developed on most adults, and their interspace is wide, so they are evenly spaced on most shells; a secondary cord is fairly prominent on the sutural ramp (above cord A) on some specimens, but most have a generalised background of fine spiral threads on strongly concave areas between and below 2 prominent cords. Aperture simple, thin-lipped, quadrate; outer lip with a wide, fairly shallow, V-shaped sinus with a rounded apex. Base flat, with many fine spiral threads, and a shallow sinus in outer lip.
Comparison: Most Opoitian-Waipipian specimens of Stiracolpus huttoni are wide and short, with cords A and B almost equally prominent, whereas Nukumaruan shells are all taller and narrower, with cord B more prominent than the upper one. Marwick (1957, p. 36) named a "subspecies" Z. huttoni ohopeus (Castlecliffian, Ohope Beach, Whakatane, Bay of Plenty), which differs in its lower-placed and still more prominent cord B, and appears to connect S. huttoni with the living S. pagoda (Reeve).
Distribution: Opoitian-Nukumaruan; Kaniere, Westland, Opoitian or Waipipian (type of Turritella bicincta = T. huttoni); Waihi Beach, Hawera, South Taranaki, Waipipian (type of Z. haweraensis); widespread in shallow-water, soft-bottom facies at Kaawa Creek, southwest Auckland (Opoitian), in Wanganui basin (Waipipian, Mangapanian), northern Hawke's Bay (Opoitian-Waipipian), central Hawke's Bay Petane Formation limestone and mudstone facies (Nukumaruan), and in Westland (Lake Kaniere, Arahura Valley, and Kapitea Creek-Hokitika district, all Waipipian).
Cite this publication as: "A.G. Beu and J.I. Raine (2009). Revised
descriptions of New Zealand Cenozoic Mollusca from Beu and Maxwell (1990). GNS
Science miscellaneous series no. 27."
© GNS Science, 2009
(Included with a PDF facsimile file copy of New Zealand Geological Survey Paleontological Bulletin 58 in CD version from: Publications Officer, GNS Science, P.O. Box 30368 Lower Hutt, New Zealand)