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Costasiella usagi  Ichikawa, 1993

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Costasiella usagi is characterized by its white longitudinal lines on the cerata. The head is white, the rhinophores are basal white, the apical region is black. The eye spots are relatively close together between the rhinophores as in all species of Costasiella.
Many pictures of variants of Costasiella usagi from Japan are at umiushi-zukan.com.
How to cite:
Köhler, E. (2017), published 18 May 2017, Costasiella usagi  Ichikawa, 1993
available from https://www.Philippine-Sea-Slugs.com/Sacoglossa/Costasiella_usagi.htm