Overview

Comprehensive Description

Description

Zemitrella n. gen. Type: Lachesis sulcata Hutton.

 

Here may be grouped the remaining New Zealand Pyrenids (except those placed in Anachis); choava, pseudomarginata, stephanophora, websteri, laevigata, rosea, the type, and (provisionally) Atilia daemona Webster. There is indication that more than one shell type is included here, but there is gradation, and till the fossil forms are better known I prefer not to split further. Marshall's Mitrella inconspicua (Trans. N.Z. Inst., vol. 50, p. 266, 1918) and some undescribed Tertiary species (e.g., Suter's “Alcira n. sp.”—N.Z. Geol. Surv. Bull. No. 20, pp. 89, 93, 1918) belong to this group, all the members of which show an oblique plait at the base of the pillar. Choava has the plait subobsolete, but all the others show it strongly, especially in juvenile shells.

 

The Neozelanic species of Anachis are divisible into two groups, one containing small shells with short beak, and the other—restricted to the Tertiary—larger shells with distinct canal. Neither of these exactly matches with Pyrene gemmulifera Hedley (the type of Retizafra) which is a minute Mitrithara-like shell from the Capricorn group, nor with the genotypes of any of the cancellate genera outlined by Iredale in Proc. Mal. Soc., vol. 12, pt. 1, p. 33, 1916. The forms of both series seem to be sublittoral dwellers of southern development, and as no other austral group is suitable I provide names.”

 

(Finlay, 1927: 431)

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© National Museum of Natural History, Smithsonian Institution

Source: Antarctic Invertebrates Website (NMNH)

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Ecology

Habitat

Depth range based on 12 specimens in 8 taxa.
Water temperature and chemistry ranges based on 6 samples.

Environmental ranges
  Depth range (m): 40 - 400
  Temperature range (°C): 7.299 - 19.083
  Nitrate (umol/L): 6.584 - 16.422
  Salinity (PPS): 34.245 - 35.443
  Oxygen (ml/l): 4.335 - 6.603
  Phosphate (umol/l): 0.282 - 1.083
  Silicate (umol/l): 3.455 - 7.971

Graphical representation

Depth range (m): 40 - 400

Temperature range (°C): 7.299 - 19.083

Nitrate (umol/L): 6.584 - 16.422

Salinity (PPS): 34.245 - 35.443

Oxygen (ml/l): 4.335 - 6.603

Phosphate (umol/l): 0.282 - 1.083

Silicate (umol/l): 3.455 - 7.971
 
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Wikipedia

Zemitrella

Zemitrella is a genus of sea snails, marine gastropod mollusks in the family Columbellidae, the dove snails.[1]

Species

Species within the genus Zemitrella include:

References

  1. ^ Zemitrella Finlay, 1926.  Retrieved through: World Register of Marine Species on 04/17/10.
  2. ^ Zemitrella spengleri Lussi, 2009.  Retrieved through: World Register of Marine Species on 17 April 2010.
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