| Lodderena formosa | ||||||||||||||||||
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| Lodderena formosa (Powell, 1930) |
Lodderena formosa is a minute sea snail or micromollusc, a marine gastropod mollusc in the family Cyclostrematidae. Dr Arthur William Baden Powell CBE (4 April 1901 - 1 July 1987 was a New Zealand malacologist, naturalist and Palaeontologist, a The word snail is a Common name that can be used for almost all members of the Molluscan class Gastropoda which have coiled shells in the A micromollusk is a descriptive term for a shelled Mollusk which is extremely small even at full adult size Marine is an Umbrella term. As an adjective it is usually applicable to things relating to the Sea or Ocean, such as Marine biology, Marine The class Gastropoda or the gastropods, also previously known as gasteropods, or univalves, and more commonly known as Snails Molluscs are animals belonging to the phylum Mollusca. There are around 250000 extant Species within the phylum with an estimated 70000 In Biological classification, family ( Latin Cyclostrematidae is a Taxonomic Family of small sea Snails marine Gastropod Molluscs in the Superorder
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Distribution
This species is endemic to the north of the North Island of New Zealand including the Three Kings Islands. Endemism is the Ecological state of being unique to a place Endemic species are not naturally found elsewhere The North Island is one of the two main islands of New Zealand, the other being the South Island. New Zealand is an Island country in the south-western Pacific Ocean comprising two main landmasses (the North Island and the South Island The Three Kings Islands ( Manawa-tawhi or Ngā Motu Karaka in Māori) are a group of
Habitat
This snail is found at depths of between 18 and 475 m. The metre or meter is a unit of Length. It is the basic unit of Length in the Metric system and in the International
Shell description
The shell is very small, solid, white, broad and depressed, almost discoid, with an accelerated last whorl. A whorl is a single complete 360° turn in the Spiral growth of a Mollusc shell. The suture is deep, canaliculate, partly overhung by numerous crenulations. Similar crenulations margin the deep, vertical-sided, wide umbilicus. The umbilicus of a shell is the axially aligned hollow cone-shaped space within the whorls of a coiled Mollusk shell Primary sculpture is of three heavy smooth spiral keels, the upper and lower biangulating the body whorl, and the intermediate one peripheral. Sculpture on a Mollusc shell is whatever natural 3-dimensional ornamentation exists on the outer surface of a shell apart from the basic shape of the shell itself The body whorl in a Mollusc shell is the most recently formed whorl of a Spiral shell, terminating in the aperture. Surface sculpture is of dense, very fine spiral lirations, plus two stronger spirals, midway on both the dorsal and ventral surfaces. In Anatomy, the dorsum is the upper side of animals that typically run fly or swim in a horizontal position and the back side of animals (like humans that walk upright The aperture is circular, the peristome much thickened internally and heavily variced externally.
The shell height is up to 0. 75 mm, and the width is up to 1. The Millimetre ( American spelling: millimeter, symbol mm) is a unit of Length in the Metric system, equal to 4 mm.
References
- Powell A. W. B., New Zealand Mollusca, William Collins Publishers Ltd, Auckland, New Zealand 1979 ISBN 0-00-216906-1
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