Nudibranchia: Goniodorididae

The malacologicalsocietymalacological society of Japan

R# VENUS (Jap. Jour. Malac.) Vo]. 4g, Ne. 1 C199e):8-18

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Notes on the Rare Genera Trapava･ia and Ancula from Japan

with the Description of a New Species (Nudibranchia: Goniodorididae)

Kikutar6 BABA

(Shigigaoka 1-11-12, Sango-cho, Ikoma-gun, Nara-ken, Japan 636)

Abstract; Trapanin o'aponica (Baba, 1935) is revised anatomieally. Ancula gibbosa (Risso, 1818)

1. Trapania jqponica (Baba, 1935) (Figs. 1-3) Synonymy:

Drepan･ia p'aponiea･ Baba, 1935, 336-338, text-fig. 4 (Mutsu Bay). Trapania a'aponica: Baba, 1957, 8 (generic name change).

Trapania iaponica･: Rudman, 1987, 197-201, figs. 3C, 7A, 8, 9 {Sydney and Townsville,

Aust.; Hong Kong).

MateTial: Mutsu Bay, Sept. 1960, in all 13 specimens coll. by Mr. H. Sando

of the Asamushi Mar. Biol. Sta., Tohoku Univ., 8mm or less preserved. Description: The external features of the body are typical for the genus

Trapania (see Rudman, 1987, 189-190). Coloration of the living animal is

unknown. In the best preserved specimen there are dark brown (=chestnut

brown) flecks and spots all over the whitish integument of the dorsum and

sides. The pump of the pharynx is sessile, and not marked. The labial plates (=jaw plates) are in the form of paired semieircular pads consisting of scales

(=rodlets) which may be short or elongated and spiny, depending on their

location. The radular formula is 25 × 1.0.1. The inner Iateral tooth is provided

with a median cusp (main cusp) whieh is flanked with a row of denticles on

either side. The denticles on the inner side are coarse and 15-20 in number.

The dentieles on the outer side are finer and 20-30 in nurnber (see Baba, 1935, 337). An outer lateral tooth is absent. The penis is armed internally with

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Baba ： Genera Trapania and Ancuta from Japan 9

B C E

’ Fig ．1． TraPania 」aPonica ツガルウミウシ（Mutsu Bay 陸奥湾産） Preserved animal ， length 8 mm 貯蔵標本，体長 8mm ． A ． Right

side view 右側面； B ， Dorsal view 背面； C ． Ventral view ．蝮面．

（See Fig ．7for letters）

long， spiny hooks． The prostate gland is long and tubular． The vagina is

accompanied with a spermatheca and a spermatocyst ．

召 maTks ： α nia aponic α seems especially R Trap ゴ（Baba ， 1935 ） to be distinguished

by the morphology of the labialplates ， radular teeth and penial armature ．

．垂配 ω ’α 2． gibbasa （Risso ， 1818）（s ．L）or

AnCitlα P α cii α M 窃 cFarla 皿 d，1905 （s ． s ，）（Figs ．4−6 ）

Synon瑠 y ：

∠4ncttlα crist α tα ： Alder ＆ Hancock 1847 fam ．1 25 Cullereoats etc ． Brit ．．，，， pL （，）

46 −47 − Brit Ancztlα g 油 bo8α ： Thompson ＆ Brown ， 1984 ，， fig．7a ， pl．12 ， a d．（．）．

MacFarland 1906 ．4 冗 o 掘 α pacifle α MacFarland ，1905 ，53 （Monterey Bay ， Calif．）；，，

148 − 149 ．20 ． − ．21 figs． − ．．， pl ， figs 89 92 ， pl ， 93 96 ， pL 30，fig 23 （PacificGrove ，Calif ）；

MacFarland − 2 − Monterey Bay to ，1966，123 124，p1．21，且g 。1，pl，29 ，且gs ． 3 （ Carme1

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10 VENUS: Vol. 49, No. 1 (1990)

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Baba ： Genera Trapania and Ancula from Japan 11

ど

4 ’ Fig．2 ． 1 raPania ／aPonica ツガルウミウシ（Mutsu Bay 陸奥湾産）

A ．Pharyngeal part from right side 咽頭部右側より； B ． Paired labial plates in frontal view 唇板 1 対前面より； C ． A transverse 一 row of teeth in the mid −region of radula 歯舌巾央辺の歯列； D ．Aleft lateral tooth in the newest region of radula 歯舌新生歯辺の左側歯．（See Fig ．7for letters） ’ Fig 。3． TraPania VaPenica ツガルウミウシ（Mutsu Bay 陸奥湾産）

A ．Liver mass from above 肝臓部背面より； B ． Part of genital 一 system from above 生殖器系部背面より； C． Vaginal part enlar −

ged 膣部拡大； D ． Penis 陰茎； E ． Rows of penial hooks enlarged 陰茎小刺列拡大，（See Fig ．7for letters）

Fig．4 ． Ancula gibbosa （s ．1．） or A Pacifica（s ． s ．）ハゴ P モウミウシ

（Abugashima ， Toyama Bay 富山湾虻ケ島産）

Material No ．1， Figures drawn after Mr ． T ． Abe 安部武雄氏作

成写生図・撮影プリントより．A ． Entire animal from above ， length

20mm 全形背面，体長 20 mm ； B ． The same from left side 同左

側面，（See Fig ，7for letters）

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12 VENUS: Vol. 49, No, 1 (1990)

:Il>gSgc il'1 A ' 'i' lt/ 'i""' tt 1 e- -O.05 e.os mm rnni B

"--

Fig. 5. Aneula gibbosa (s,I.) or A, Pacijica (s,s,) -li =' ptVE VV (Abugashima, Toyarna Bay E[Ursntij-reee) Material No. 2, A. Labial armature (labial disc) and its spiny scales ljexMVC)I CDMptt4xtwde ; B. Radula va=; C. Transverse

rows of teeth in the mid-region of radula vafiijifklvaOtsYU; D.

Penis with penial hooks kgMVte`DdhptUIU. (See Fig. 7 for letters)

Point, Calif.); Marcus, 1961, 28-29, pl. 6, figs. 97-102 (Pacific Greve, Calif,);

Behrens, 1980, 52, fig. 41 (San Juan I., Wash. to San Diego, Calif.) ; McDonald

& Nybakken, 1981, 40, fig. 6 (San Juan I., Wash. to San Diego, Calif.) ; MeDonald,

1983, 144-145, fig. 43 (San Juan I., Wash, to San Diego. Calif.); Goddard, 1984,

146 (Oregon).

Ancula sp. Usuki, 1969, 5, pl. 1, fig. 11 (Sado I.); Takahashi, 1970, 9, fig. (Toyama Bay). Material:

No. 1. Abugashima, Toyama Bay, Apr. 29, 1970, 1 specimen eoll., fig. and photo.

by Mr, T. Abe (Takaoka Biol. Club), 20 mm alive;

No. 2. Abugashima, Toyama Bay, May 2, 1971,2 speeimens eoll. by Mr. T. Abe,

7 mm preserved (anatomy) ;

No, 3. Sado I., May 14, 1965,1 specimen coll. and photo. by Dr. I. Usuki (Sado

Mar. Biol. Sta., Niigata Univ.), 20 mm alive;

No. 4. Sado I., Apr. 1968, 2 speeimens coll. by Dr. I. Usuki, 8mm preserved

(anatomy) ;

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Baba ： Genera Trapania and Ancala from Japan 13

！・ゴロモウミウシ Fig ．6． Anc πla gibbosa （s ．1．） or A ． Pacifca（s ． s ．）（Sado L 佐渡島産）

E Material No 5 D Material No 4 A ．Materal No ，3 ； B ， C ，，．；，．．

A ．Entire anima1 from right side ，1ength 20 mm ， drawn after Dr ． 1．Usuki 全形右側面より，体長 20 mrn ，臼杵格博士撮影スライドよ

り； B ．Digestive system from above 消化器系背面より iC ． Nerve centre with a biood gland 中央神経系と血腺； D ． Pharyngeal part from right side showing details of labial armature and radular

．び・の sys ・ teeth 咽頭部右側より，及唇盤歯舌細部拡大； E ．Genital tem from above 生殖器系背面より．（See Fig．7for letters）

to 1968 coll ．．． 8mm No ．5． Sado I．， between 1965 ， 4specimens by Dr 1 Usuki， preserved （anatomy ）．

∠4ncula α 6 c α Description ： My specimens are almost exactly identical 七〇 P 頑

s s ex 七emal the dorsal color MacFarland， 1905 （．．） in the body form ， pattern and the internal structures such as the radular teeth and penial hooks ． Each

rhinophore is provided with two extra −rhinophoral processes which are united

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14 VENUS: Vol. 49, No.1(1990)

at their bases. The extra-branchial processes vary from 3 to 6 in number in different specimens and positions. The branchial circle consists of three bi-

pinnate plumes. The oral tentacles are short and blunt. The foot eorners are

rounded. The tail has a median erest.

The general integument of the body is whitish. On the dorsum there are

three (one median and two lateral) longitudinal yellow stripes which may be

broken in plaees. The tail-erest is yellow. In my specimens the rhinophores

are opaque white, not pigmented yellow. The extra-rhinophoral processes are

eaeh banded with yellow in the middle. The gills are white with yellow tips.

The extra-branchial processes are eaeh opaque white, or yellow at the tips.

The pump ef the pharynx is sessile, but it is mueh raised. The labial arma-

ture is a circular ring interrupted above and formed of spiny scales. The

radular formula is 35 × 1.1.1.1.1. A redueed rachidian p]ate (=central tooth)

is discernible. The inner lateral tooth has an outer cusp (main cusp) and a

row of 10-20 denticles on the inner side of the tooth. The outer lateral tooth

(marginal tooth) is hooked at the tip. The penis is armed internally with

minute hooks. The genera! composition of the genital complex is as figured

by Mareus, 1961, pl. 6, fig. 101.

Remarks: According to Thompson & Brown (1984: 46-47), the Californian species, Ancula pacilica MacFarland, 1905, is to be united with the North Euro- pean A. gibbosa (Risso, 1818), into a single worldwide species, A. gibbosa (s. I.).

In the color patterning, however, the two forms differ in most cases as below:

A. paciiica (s. s.) : dorsum with 3 longitudinal yellow stripes.

A. gibbosa (s.s.) : no yellow stripe present on dorsum. Strictly speaking, enly Aneula pacifica (s. s.) is identifiable in Japan.

3. Ancttla (Eucrairia) kariuana n. sp.

(Fig. 7)

Synonymy :

Polyeera sp. Takahashi, 1971, 2, fig. (Toyarna Bay); Takahashi, 1977, 22, fig. (Fuka-

ura, Aomori).

MateTial: Kariyaga-zaki near Nagai, Sagami Bay, Mar. 24, 1974, 1 speeimen

eoll. and photo. by Mr. T. Akiba, 17 mm alive.

Description: The rhinophores each have two extra-rhinophoral processes united

below. The branchial eirc!e has a single extra-branchial proeess on either side,

and is formed of three, simply- or bi-pinnate plumes. The foot corners are rounded. Oral tentaeles were not found. A median erest is present on the tail.

The ground-color of the body is whitish. Dorsally and laterally it is overlaid

with purple-black (daTk chocolate) flecks and spots. The interspace between

the shafts of the two rhinophores is oecupied by a large, inverted-triangular

patch of purple-black. The tips of rhinophores are opaque white. The gills are

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Baba ： Genera Trapania and Ancula from Japan 15

一〇．05 mm

Fig ・7 ・ Ancerta （Eucrairia ） hariyana n ． sp ．カリヤウミウシ（新種） ’ 〔Kariyaga ・zaki ， Sagami Bay 相模湾仮屋ケ崎産）

A Entire animal from above 1ength ．， 17 mm ， drawn after Mr ．

よ 17mm ス T ．Akiba 全形背面り，体長，秋葉民雄氏撮影ライドより； B ．Labial armature and its spiny scales 唇盤及びその構成小鱗歯； C ．Transverse rows of teeth in the mid −region of radula 歯舌中央辺の歯列； D ．Asingle right lateral tooth enlarged 右側歯 1個の拡大，

： Letters 記号 a ． anus 肛門；am ． ampulla 貯精部； at ． atrium 前庭腔； BG ． buccal ganglion 口球神経節； bg ． blood gland 血腺； c． spermatocyst 貯精嚢； ca ． caecum 盲嚢； cr ． tail crest 尾隆起； di． inner denticles 内側小歯； do． outer denticles 外側小歯； Eb ． extra ．branchial process 鰓外側突起； Er ． − extra rhinophoral process 触角外側突起； fe． foot corner 足隅； fg． fema1e gland mass 雌性付属腺部； go ． genita 夏 orifice 生殖門； in． intestine 腸； is． insemination duct授精管； Lliver 肝； m ． main cusp 主歯尖； mk ． purPle −

blackmark 紫黒紋； n ． nephroproct 腎門； oe ． oesophagus 食道；ov 。 oviduct 輸卵管； p ．penis 陰茎； ph ． pharynx 咽頭； pr ． prostate 前立腺； pu ． pump 吸引ポンプ； rh ． rhinophore 触角； s ． hooks （spines ）小刺； se ． scales 小鱗歯； sg ． salivary gland 唾腺； st ． stomach 胃； t， spermatheca 受精嚢； te。 oral tentacle 口 tu ． oral tube 口 v ． vagina ． vas 触手；．道；膣； vd deferens 輸精管； vg ． vestibular gland fiiiVa腺； w ． white 白色； y． yellow 黄色； z ． rachidian plate （central tooth ）基板（中央歯）．

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whi 七e below and yellow at the tips． The extra −rhinophoral processes are yellow

along the whole leng七h． The extra −branchial processes are yellow in the middle

and opaque white at the tips． The tail−crest is opaque white 。

ring −shaped armature notched above and consis 七s of spiny The labial is ，

scales ． The radular rows are about 40 ． The inner lateral tooth has an outer − ・ cusp （main cusp ） which is followed by a series of 35 40 denticles on the innel

side ． The outer lateral 七〇〇 th could not be seen ．

Rem α rks ： Based on the external morphology the Ancorlα of the body ， genus

Lov6n，1846 （s ． L） ls divisible into 2 subgroups or subgenera ： − （A ） Ancul α s ． s ． With a number of extra branchial processes on either side ．

1 ．．4 ． A ． α s ．． of ．（） gibbos （Risso ， 1818 ）（ L ）（Atl Europe ； Part the Med ；

Pacific N ． Amer ．； Japan ）

α α ＝ γ ep α − （B ） Eucr iri Burn ， 1961 （ D αnielL Burn ， 1961 ）．With a single extra

branchial process on either side ．

．．． map α e ． 2 A （E ）（Burn ，1961）（Torquay ， Aust ）

3 ． A ．（E ．） lentiginosa Farmer ， 1964 （Calif．to Mexico ）

4 evetiu α e ． A ．（E ．） Marcus ， 1961 （N ．Carolina ）

5． A ． E ． Odhner 1926 Tierra del Fuego （） fuegiensis ，（） 6． A ．（E ．） kariyano n ． sp ．（Sagami Bay ）

color seen species numbers and above When the in lifeis ， 2 ， 3 ， 4 differ from

each other in the patterning of mostly dark brown pigment covering the dorsal

por 七ions of the body ． Also A ．（E ．）紘 r 吻 α π α n ． sp ． is distinguishable from them

by the possession of a dark， inverted−triangular patch between the two rhino −

phores ． The specific name kα riy α na is due 七〇 the 七ype locali七y of 七his species ， Kariyagazaki near Nagai in Sagami Bay ． The taxonomy of the subgenus ・ Eucr α iriα is to be revised in the future ．

− Acknewlealgements ’ The manuscript of this paper was critically read by Dr ． Gary

R ．McDonald of the Joseph M ． Long Marine Laboratory University of California．，

要約ハツガルウミウシ属 TraPania 及びゴ卩モウミウシ属 Ancula はネコジタウミウシ科 Goniodori ・

didae の中でやや異形の属と言えよう。即ちその体形はフジタウミウシ科 Polyceridae の体形に似て

ナメクジ状であるが．内部的には歯舌の形態でネコジタウミウシ科に入ることが判然とする。これら

の両属では両触角の外側及び鰓群の外側にそれぞれ角状乃至棍棒状の突起（外側突起）があることも

でのこ異形的。本文は日本産数種知．見を集約した。れらの種は小形で，稀産にぞくする。

1． TraPania daPonica（Baba ，1935）ツガルウミウシ（馬場，1957）

陸奥湾産。追加標本は山洞仁氏により同湾コアマモ帯から採集された。固定時の体長 8mm 位，体．ののース・色は白色地に大小不同暗褐色斑紋多数があった。生時の体色は未詳。本種はオ．トラリア香

港にも分布が知られる。

2． Ancula gibbosa （Risso，1818）（s ．1．） or A ． pacifica MacFarland ，1905 （s ． s ．）ハゴ卩モウミウシ（臼杵，1969）

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Baba ： Genera Trapania and Ancula from Japan 17

．で 20mm のは佐渡（臼杵格博士）及び富山湾（安部武雄氏）採集。生時体長迄。生時体色概ね図

のに示の通りで背面前方には 3 条黄色縦帯があり，又尾部正中線上も黄色縦帯 1条がある。体地色は

乙ハゴ卩モウミウシののかアメリカの Ancula と白色。本邦産はそ体色上特色ら，太 1 洋岸産 Pacifica

ヨーロパ一のは的確に同定することができる。他方 A ．Pacificaはッ大西洋岸分布（部地中海）種

Ancula gibbosa のシノニム（同物異名）とも言われる（但し A ． gibbosa では背面に 3 条の黄色縦帯

はない）。本文では両名を並記した。

3． Ancuta （Eucrairia）kariyana n ． sp ．カリヤウミウシ（新称）

ケ 17mm ハゴ P モウミウシと模式は相模湾長井仮屋崎産（秋葉民雄氏採集）。生時体長。前種異

ハゴ Pt モシハゴロモミなり，鰓群両側の突起は各側 1個のみ（ウミウでは各側数個列生）。それ故ウ

ウシとは同属中の別群（別亜．属）として示した。体は白色地に紫黒色大小の斑紋があり，特に両触角

つ・中間の逆三角形大形紋はよく目立。本種は富山湾及び青森県深浦にも産する。種名和名は模式産

地仮屋ケ崎による Q

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Antarctic Expedition 1901-190e, 2(1) : 1-100, pls. 1-3.

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