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1 April 2012 Observations on Embryonic Development of Black-Spot Jorunna, Jorunna Funebris (Kelaart, 1859) (Gastropoda: Nudibranchia)
Pattira Kasamesiri, Shettapong Meksumpun, Charumas Meksumpun
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Jorunna funebris is one of the nudibranch species with the largest distribution worldwide, but there is lack of information about its life history. To provide more information on embryonic development, 19 adult nudibranchs ranging in length from 1.3–6.5 cm were collected from the Gulf of Thailand for examination of embryonic development under laboratory conditions. The seawater conditions in the broodstock aquaria were as follows: temperature range, 22.3–26.3°C; salinity, 27.9–34.0 psu; dissolved oxygen, 7.0–8.3 mg/L; and pH, 7.2–8.9. Each nudibranch laid only 1 egg mass after culturing for 1–3 days. The egg masses of J. funebris ranged from 17.1–48.0 cm in length, and between 0.4 cm and 0.7 cm in width. The density of egg capsules varied from 27–64 egg capsules/mm2 of egg mass (n = 4), and each egg capsule had 1–4 larvae inside (n = 9). The embryonic period (expressed as the mean ± SD) was 7.3 ± 1.0 days (n = 7 egg masses). Based on the results of uncleaved embryonic diameter, embryonic period, and shell pattern, the development mode of J. funebris could be defined as “planktotrophic development.”

Pattira Kasamesiri, Shettapong Meksumpun, and Charumas Meksumpun "Observations on Embryonic Development of Black-Spot Jorunna, Jorunna Funebris (Kelaart, 1859) (Gastropoda: Nudibranchia)," Journal of Shellfish Research 31(1), 111-117, (1 April 2012).
Published: 1 April 2012
embryonic development
Gulf of Thailand
Jorunna funebris
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