Pachykellya rotunda, copyright Te Papa Tongarewa.

Belongs within: Bivalvia.

The Leptonidae are a group of small byssiferous bivalves with a generally compressed shell bearing very small beaks.

<==Leptonidae P61
    |–Zemyllita Finlay 1927 P61
    |    `–*Z. stowei (Hutton 1873) P61 [=Pythina stowei P61, Myllita stowei F27]
    |–Melliteryx Iredale 1924 P61
    |    |–*M. acupuncta [=Erycina acupuncta] P61
    |    `–M. parva (Deshayes 1856) P61 [=Erycina parva F27]
    |–Arthritica Finlay 1927 P61
    |    |–*A. bifurca [=Kellia bifurca] P61
    |    |–A. crassiformis Powell 1933 P61
    |    `–A. helmsi (Hedley 1915) [=Erycina helmsi] F27
    |–Borniola Iredale 1924 P61
    |    |–*B. lepida [=Bornia lepida] P61
    |    |–B. neozelanica Powell 1937 P61
    |    `–B. reniformis HS01
    |–Lepton N79
    |    |–L. clarkiae N79
    |    |–L. meroeum Carpenter 1864 C64
    |    |–L. nitidum N79
    |    `–L. squamosum J64
    |–Myllitella Finlay 1927 P61
    |    |–*M. vivens Finlay 1927 P61
    |    |–M. finlayi (Marwick 1924) [=Myllita finlayi] F27
    |    |–M. pinguis Marwick 1928 P61
    |    `–M. tasmanica [=Myllita tasmanica] F27
    |–Pachykellya Bernard 1897 P61
    |    |–*P. edwardsi Bernard 1897 P61
    |    |–P. bernardi Powell 1927 P61
    |    |–P. concentrica Powell 1927 P61
    |    |–P. minima Powell 1931 P61
    |    `–P. rotunda Powell 1927 P61
    `–Marikellia Iredale 1936 P61
         |–*M. solida [=Kellia solida] P61
         `–M. rotunda (Deshayes 1855) P61

*Type species of generic name indicated


[C64] Carpenter, P. P. 1864. Supplementary report on the present state of our knowledge with regard to the Mollusca of the west coast of North America. Report of the British Association for the Advancement of Science 33: 517–686.

[F27] Finlay, H. J. 1927. A further commentary on New Zealand molluscan systematics. Transactions and Proceedings of the New Zealand Institute 57: 320–485.

[HS01] Hayward, B. W., A. B. Stephenson, M. S. Morley, W. M. Blom, H. R. Grenfell, F. J. Brook, J. L. Riley, F. Thompson & J. J. Hayward. 2001. Marine biota of Parengarenga Harbour, Northland, New Zealand. Records of the Auckland Museum 37: 45–80.

[J64] Jeffreys, J. G. 1864. Report of the committee appointed for exploring the coasts of Shetland by means of the dredge. Report of the British Association for the Advancement of Science 33: 70–81.

[N79] Norman, A. M. 1879. The Mollusca of the fiords near Bergen, Norway. Journal of Conchology 2: 8–77.

[P61] Powell, A. W. B. 1961. Shells of New Zealand: An illustrated handbook 4th ed. Whitcombe and Tombs Limited: Christchurch.

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