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Tuatara: Volume 25, Issue 2, January 1982

Bivalvia

page 73

Bivalvia

Cucullaeidae.

  • Cucullaea sp. (2 valves)

Arcidae.

  • Barbatia novaezelandiae (E. A. Smith) (R)

Glycymeridae.

  • Glycymeris modesta (Angas) (R) Mytilidae.
  • Perna canaliculus (Gmelin) (R)
  • Aulacomya ater maoriana (Iredale) (R)
  • Modiolus areolatus (Gould) (R)
  • Modiolarca impacta (Hermann) (R)
  • Lithophaga truncata (Gray) (R)

Ostreidae.

  • Ostrea lutaria Hutton (U)

Pectinidae.

  • Pecten novaezelandiae Reeve (1 valve)
  • Chlamys dieffenbachi (Reeve) (U)
  • Chlamys ?gemmulata (Reeve) (R)
  • Chlamys delicatula (Hutton) (1 only)

Kelliidae.

  • Kellia cycladiformis (Deshayes) (R)

Carditidae.

  • !Cardita aoteana Finlay (R)

Mactridae.

  • Mactra discors Gray (R)
  • Mactra ordinaria E. A. Smith (R)
  • Longimactra elongata (Quoy & Gaimard) (R)
  • Spisula aequilateralis (Deshayes) (R)

Mesodesmatidae.

  • !Paphies subtriangulata quoyii (Deshayes) (R)

Tellinidae.

  • Zearcopagia disculus (Deshayes) (R)
  • Psammobiidae.
  • Gari lineolata (Gray) (R)
  • Gari stangeri (Gray) (U)

Veneridae.

  • Tawera spissa (Deshayes) (U)
  • Notopaphia elegans (Deshayes) (R)
  • Notirus reflexus (Gray) (R)
  • Venerupis largillierti (Philippi) (U)
  • Chione stutchburyi (Wood) (R)
  • Dosina z. zelandica (Gray) (U)

Hiatellidae.

  • Panopea smithae Powell (1 only)

Pholadidae.

  • Anchomasa similis (Gray) (R)
  • Pholadidae spathulata (Sowerby) (R)

Myochamidae.

  • Myadora striata (Quoy & Gaimard) (1 valve)

Cephalopoda

Octopodidae.

  • Octopus maorum Hutton (P)
page 74

Many of the shells listed above are far removed from their hitherto noted habitats (Graham, 1962). For instance, some intertidal species can be found in this deeper water, while other normally deeper water species have been taken in this comparatively shallow habitat. Since most are dead shells inhabited by hermit crabs, their occurrence in the pots may be more indicative of crab movements than of molluscan distribution. Dead shells of Struthiolaria papulosa gigas have been found, many in perfect condition, yet I have never taken this species alive in North Otago by any method. It should be noted that the identification of Maurea pellucida ?pellucida is based on the specimens having more incised sculpture and deeper colour than M. p. forsteriana. In general, most molluscan shells from the pots are eroded and encrusted with Porifera, Bryozoa or the Cirripedes Balanus decorus or B. trigonus. All gastropods in this condition have the slipper shell, Maoricrypta monoxyla, living within their apertures.

I am very grateful to Mr Douglas Mills who has continued to bring specimens ashore for me since my retirement from the fishing industry and I thank those other Oamaru fishermen whose curiosity has added to the species recorded.

References

GRAHAM, J. 1962. North Otago Shelf Fauna. Part 1 — Mollusca. Trans. Roy. Soc. N.Z. Vol. 2, No. 9, pp 55-9.

POWELL, A. W. B. 1979. New Zealand Mollusca, William Collins Publishers Ltd., Auckland. 500 pp.