Tawera spissa

Tawera spissa, the morning star shell, is a species of marine bivalve from the Veneridae family.[1] T. spissa is endemic to New Zealand.[2]

Morning star shell
Scientific classification
Kingdom: Animalia
Phylum: Mollusca
Class: Bivalvia
Subclass: Heterodonta
Order: Venerida
Family: Veneridae
Genus: Tawera
Species:
T. spissa
Binomial name
Tawera spissa
(Deshayes, 1835)
Synonyms

Description

Tawera spissa is 20-25 mm in length and has a triangular shape with oblong valves. Each valve has rows of ridges. The valves are often white with a variety of brown patterning, but can also be completely white or completely brown in colour. On the internal surface, the valves are white, with brown adductor scars.[2]

Habitat

Individuals occupy fine to coarse sand and light gravel substrates just below the surface. Their depth range is typically slightly below the low tide mark down to 200m in depth. They tend to be found in areas where there is some water movement. Tawera spissa may be the dominant species in subtidal benthic zones alongside Purpurocardia purpurata in widespread open coastal communities or with Zemysina globus in more sheltered conditions such as bays in southern New Zealand.[2]

References
  1. MolluscaBase (2019). MolluscaBase. Tawera spissa (Deshayes, 1835). Accessed through: World Register of Marine Species at: http://www.marinespecies.org/aphia.php?p=taxdetails&id=507911 on 2019-06-24
  2. Cook, Steve de C (2010). New Zealand Coastal Marine Invertebrates 1. Canterbury, New Zealand: Canterbury University Press. p. 528. ISBN 978-1877257-60-5.
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