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  3. Order Doridida
  4. Infraorder Doridoidei
  5. Superfamily Doridoidea
  6. Family Discodorididae
  7. Genus Thordisa
  8. Thordisa sanguinea

Thordisa sanguinea Baba, 1955

ヒメチシオウミウシ Thordisa sanguinea

Location
Monshita, Osezaki, Shizuoka, Japan
Date
2019/05/13
Length
10mm
Depth
21.0m
Water temperature
16.0℃

Description

A small Dorididae, body length 13 mm. The dorsum is covered by sharp, long villi-like papillae, which are white against the orange-yellow ground. Three to four dark eye-spots are arranged anteroposteriorly on the dorsal midline. Rhinophores dark brown. Six gills, bi- to tri-pinnate, dark brown. Ventral surface a uniform paler orange than the dorsum. Oral tentacles finger-shaped. No labial plate. Radula formula 30×35.0.35. The 10-12 innermost lateral teeth are very small, gradually increasing in size outward. All laterals are smooth sickle-shaped, except for the outermost 5-6 laterals, whose tips are split comb-like — the diagnostic basis for placement in Thordisa.

Distribution

Type locality is off Nishi-no-saki, Sagami Bay (10 m depth, April 1941, single specimen). An additional specimen was recorded from Kasashima, Sagami Bay (intertidal, April 1951). The original description (Baba, 1955) records the species only from Sagami Bay.

Etymology

The specific epithet sanguinea is Latin for blood-coloured. The original description does not give an explicit etymology paragraph; the descriptive sense reflects the orange-yellow ground colour.

Remarks

The coloration superficially resembles that of Rostanga-type "Iso-umiushi", but the latter has gills arranged in a complete circle around the anus and a markedly different radula. Placement in Thordisa is based on the comb-like split apices of the outermost lateral teeth.

References

A Kindle field guide by the site author

Kimoto N. (2026). Sea Slugs of Japan & the Indo-Pacific, 2nd Edition. cover

Kimoto N. (2026). Sea Slugs of Japan & the Indo-Pacific, 2nd Edition.

Kindle Edition

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Seasonality

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Photos of Thordisa sanguinea

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yam 山下 実里( ザ・ダイブス )
Hamanako

kikkonoumiushi Kishiko Matsumoto
Imabari

goooowwww Go Kobaton
Hamanako

YUYA
Tulamben

yokadive 天草よかよかダイビング　中野 誠志
Amakusa

mizu_5 Mizu
Hamanako

kukimbia.yukio Yukio Seki
Hamanako

kukimbia.yukio Yukio Seki
Hamanako

arairai0722 新井 隆大(DSあらいぐま)
Tago, Futou, Dougashima

Micro-hunter-yu DS.ウミウシハンターズ 池田雄吾　全部城ヶ島水域のみ投稿
Jogashima

Micro-hunter-yu DS.ウミウシハンターズ 池田雄吾　全部城ヶ島水域のみ投稿
Jogashima

Micro-hunter-yu DS.ウミウシハンターズ 池田雄吾　全部城ヶ島水域のみ投稿
Jogashima

eriko.a 安藤恵利子
Hamanako

oasis akihito iwakiri(oasis)
Hamanako

kominekazuyoshi 小峰かずよし
Hamanako

bighit2000 Manabu Kakegawa
Tago, Futou, Dougashima

bighit2000 Manabu Kakegawa
Osezaki

tanaka Hiroki Tanaka
Sirahama

Micro-hunter-yu DS.ウミウシハンターズ 池田雄吾　全部城ヶ島水域のみ投稿
Jogashima

nobuhiko KIMOTO Nobuhiko
Jogashima

SEKY SEKY
Yokosuka

SEKY SEKY
Jogashima

Micro-hunter-yu DS.ウミウシハンターズ 池田雄吾　全部城ヶ島水域のみ投稿
Miyagawa Bay

sksp Wei-Zhi Hong
Lieyu

Micro-hunter-yu DS.ウミウシハンターズ 池田雄吾　全部城ヶ島水域のみ投稿
Miyagawa Bay

Micro-hunter-yu DS.ウミウシハンターズ 池田雄吾　全部城ヶ島水域のみ投稿
Jogashima

nobuhiko KIMOTO Nobuhiko
Osezaki

Specimen & DNA

Observation Database COI 16S H3
#15334 BOLD Systems SSWBP250-25#COI-5P SSWBP250-25#16S

Academic Database

Sea slug observation data is available in international marine biodiversity databases.

BISMaL OBIS DOI: 10.48518/00032

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