Estea

Estea subfusca, copyright Te Papa Tongarewa.

Belongs within: Rissooidea.

Estea is a New Zealand genus of rissooid gastropods with a solid shell bearing an almost circular aperture and thin peristome (Powell 1927).

Characters (from Powell 1927): Shell solid, opaque; aperture almost circular with a thin peristome, reflexed all round and joined to parietal wall only for a short space. Adult whorls may be smooth, ornamented with axial growth-lines, folds, or riblets, or spirally lirate sometimes with combined axial and spiral sculpture.

<==Estea Iredale 1915P61
|--*E. zosterophila (Webster 1905) [=Rissoa zosterophila]P61
|--E. angustata Powell 1927P61
|--E. crassicarinata Powell 1937P61
|--E. crassicordata Powell 1937P61
|--E. gracilispira Powell 1933P61
|--E. guesti Powell 1933P61
|--E. impressa (Hutton 1885)P61 [incl. Haurakia mixtaF27]
|--E. incidataP27
|--E. insulata Marwick 1928P61
|--E. manawatawhia Powell 1937P61
|--E. micronema (Suter 1898)P61
|--E. minor (Suter 1898)P61
|--E. minutula Powell 1933P61
|--E. morioria Powell 1933P61
|--E. porrecta Powell 1933P61
|--E. porrectoides Powell 1937P61
|--E. rekohuana Powell 1933P61
|--E. rufoapicata (Suter 1908)P61 [=Rissoa rufoapicataD56]
| |--E. r. rufoapicataP61
| `--E. r. latior Dell 1956P61
|--E. sculpturata Dell 1956P61
|--E. semiplicata Powell 1927P61
|--E. semisulcata (Hutton 1885)P61
|--E. subfusca (Hutton 1873)P61
|--E. subrufa Powell 1937P61
`--E. verticostata Powell & Bartrum 1929PB29

*Type species of generic name indicated

References

[D56] Dell, R. K. 1956. The archibenthal Mollusca of New Zealand. Dominion Museum Bulletin 18: 1–235.

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

[P27] Powell, A. W. B. 1927. The genetic relationships of Australasian rissoids. Part 1. Descriptions of new Recent genera and species from New Zealand and Kermadec Islands. Transactions and Proceedings of the New Zealand Institute 57: 534–548.

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

[PB29] Powell, A. W. B., & J. A. Bartrum. 1929. The Tertiary (Waitematan) molluscan fauna of Oneroa, Waiheke Island. Transactions and Proceedings of the New Zealand Institute 60: 395–447.

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