Revised descriptions of New Zealand Cenozoic Mollusca from Beu and Maxwell (1990)
(Pl. 42l): GS12501, V20/f17, siltstone in high outcrop at junction of Napier-Wairoa and Napier- Taupo highways, north of Napier, Nukumaruan (GNS)
Beu & Maxwell (1990): Chapter 15; p. 326; pl. 42 l.
Synonymy: Cancellaria lacunosa Hutton 1885b, p. 320
Classification: Cancellariidae: Admetinae
Description: Small for family (15-18 mm high) but largest of New Zealand Bonellitia species, with strongly inflated whorls, moderately tall spire (slightly taller than aperture), and short, inflated last whorl with wide, shallow siphonal notch (but no canal) forming very low fasciole. Suture deeply impressed. Sculpture of low, wide spiral cords, 4 on spire whorls and 8 or 9 on last whorl, each bearing 2-4 narrow, prominent spiral threads, and interspaces between uppermost 5 cords each with 1 central spiral thread; cords decreasing in prominence down last whorl to merge over base into general background of spiral threads; all crossing prominent, narrowly rounded, slightly prosocline axial costae, 16-17 per whorl, extending from suture to well down on base, with only very low, rounded nodules at sculptural intersections. Aperture large, oval, with simple thin outer lip; columella curved to right at base, then truncated by anterior notch, bearing 3 equally prominent plaits. Protoconch small, of only 1 whorl, with bulbous apex, bearing many finely malleate, microscopic spiral lirae.
Comparison: The living species Bonellitia superstes Finlay, 1930 is smaller and has slightly larger nodules than B. lacunosa, whereas the Opoitian-Mangapanian species B. fundata has fewer, coarser spiral cords and markedly larger nodules.
Distribution: Nukumaruan; "Petane", i.e., hillside behind Petane Pa, north of mouth of Esk River, north of Napier, central Hawke's Bay (type); widespread but uncommon in Nukumaruan blue-grey siltstone in Hawke's Bay: Devil's Elbow mudstone at top of Devil's Elbow hill, Napier-Wairoa highway; "Petane corner", junction of Napier-Wairoa and Napier-Taupo highways; Bayview-Eskdale inland road; Watchman Hill and Roro-o-kuri, Ahuriri Lagoon; Ashcott Road at foot of Pukeora Hill and Maharakeke Road, Pukeora Hill, near Waipukurau.
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)