Hypselodoris iba

Hypselodoris iba is a species of sea slug or dorid nudibranch, a marine gastropod mollusc in the family Chromodorididae.[2] It has previously been confused with Hypselodoris bullocki.

Hypselodoris iba, pale form, Sangeang, Lesser Sunda Islands, Indonesia

Hypselodoris iba
Bima Bay, Nusa Tenggara, Indonesia
Scientific classification
Kingdom: Animalia
Phylum: Mollusca
Class: Gastropoda
Subclass: Heterobranchia
Order: Nudibranchia
Suborder: Doridina
Superfamily: Doridoidea
Family: Chromodorididae
Genus: Hypselodoris
Species:
H. iba
Binomial name
Hypselodoris iba
Gosliner & Johnson, 2018[1]

Distribution

This nudibranch was described from 35 m (115 ft) depth at Aphol’s Reef, Tingloy, Maricaban Island, Batangas, Philippines, 13.6586°N 120.90129°E / 13.6586; 120.90129. It is also reported from Indonesia.

Description

Hypselodoris iba has previously been confused with Hypselodoris bullocki although DNA sequencing suggests that it is a mimic rather than a close relative. It has a range of colour forms. Typically it has a violet semi-translucent body with a bright opaque white margin to the mantle. The violet colouration can be absent and replaced by milky white or present just as a more intense inner border to the mantle. In these pale colour forms there is usually a brown patch in the middle of the back, edged with violet. The gills are pale at the base becoming orange or brown towards the tips. The rhinophores have orange or brown clubs and usually have purple bases. A characteristic which distinguishes this species from similar coloured species in the Hypselodoris bullocki clade is that the mantle behind the gills is quite abruptly narrowed and contain a concentration of subcutaneous defensive glands.[1] This species can reach a total length of at least 70 mm.[1][3]

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gollark: I heard that English had *half* that entropy.
gollark: > fe maleYou mean "iron man"?
gollark: What *is* the wall demon?
gollark: no.

References
  1. Epstein, H. E.; Hallas, J. M.; Johnson, R. F.; Lopez, A.; Gosliner, T. M. (2018). Reading between the lines: revealing cryptic species diversity and colour patterns in Hypselodoris nudibranchs (Mollusca: Heterobranchia: Chromodorididae). Zoological Journal of the Linnean Society. 2018, XX, 1–74. With 40 figures.
  2. MolluscaBase (2018). Hypselodoris iba Gosliner & Johnson, 2018. Accessed through: World Register of Marine Species on 2018-09-26.
  3. Gosliner, T.M., Behrens, D.W. & Valdés, Á., 2018. Nudibranch and Sea Slug Identification - Indo-Pacific. New World Publications; 2nd Revised, Updated edition. 452 pp. ISBN 1878348671, ISBN 978-1878348678, p. 188
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