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 1915 P61
    |--*E. zosterophila (Webster 1905) [=Rissoa zosterophila] P61
    |--E. angustata Powell 1927 P61
    |--E. crassicarinata Powell 1937 P61
    |--E. crassicordata Powell 1937 P61
    |--E. gracilispira Powell 1933 P61
    |--E. guesti Powell 1933 P61
    |--E. impressa (Hutton 1885) P61 [incl. Haurakia mixta F27]
    |--E. incidata P27
    |--E. insulata Marwick 1928 P61
    |--E. manawatawhia Powell 1937 P61
    |--E. micronema (Suter 1898) P61
    |--E. minor (Suter 1898) P61
    |--E. minutula Powell 1933 P61
    |--E. morioria Powell 1933 P61
    |--E. porrecta Powell 1933 P61
    |--E. porrectoides Powell 1937 P61
    |--E. rekohuana Powell 1933 P61
    |--E. rufoapicata (Suter 1908) P61
    |    |--E. r. rufoapicata P61
    |    `--E. r. latior Dell 1956 P61
    |--E. sculpturata Dell 1956 P61
    |--E. semiplicata Powell 1927 P61
    |--E. semisulcata (Hutton 1885) P61
    |--E. subfusca (Hutton 1873) P61
    `--E. subrufa Powell 1937 P61

*Type species of generic name indicated

REFERENCES

[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 4^th ed. Whitcombe and Tombs Limited: Christchurch.