ミオドコーピナ亜目に属する貝虫類2種の幼生期の形態について...

Hokkaido University of Education

�

�

Title ミオドコーピナ亜目に属する貝虫類2種の幼生期の形態について

Author(s) 蛭田, 眞一

Citation 北海道教育大学紀要. 第二部. B, 生物学,地学,農学編, 30(2): 145-167

Issue Date 1980-03

URL http://s-ir.sap.hokkyodai.ac.jp/dspace/handle/123456789/6374

Rights

Journal of Hokkaido University of Education (Section II B) Vol. 30, No. 2 March, 1980-fbySiatint^ffiS (^2$|SB) ^30^ ^2-f BSW 55 ^ 3 ^

Morphology of the Larval Stages of Vargula kilgendorfii

(G. W. Muller) and Euphilomedes nipponica Hiruta from Japan

(Ostracoda : Myodocopina)

Shinlchi HIRUTABiological Laboratory, Kushiro College, Hokkaido University of Education,

Kushiro 085

^ —: $ t K^-b°-^-^g^^t^MAZ

2m^±m^m^^^r

WWK^MW^W^

Abstract

The morphology of all the larval stages of two myodocopid ostracods : Vargula hilgendorfii(G. W. Miiller) and Euphilomedes nipponica Hiruta was studied. Both species have a total of fivedifferent larval stages, and the morphological differentiation of the first antenna, sixth limb, andseventh limb almost accords with that of other myodocopid ostracods so far known.

Introduction

Up to the present, the post-embryonic development of several myodocopid ostracods had

been investigated in detail by some workers (Skogsberg, 1920 ; Poulsen, 1962 ; Kornicker, 1969 ;Hiruta, 1977, 1978, 1979 a, b). The present paper deals with the morphology of all the larvalstages of Vargula hilgendorfii (G. W. Miiller, 1890) and Euphilomedes nipponica Hiruta, 1976, as a

fifth report on the ontogeny of myodocopid ostracods. The former species belongs to the familyCypridinidae and the latter belongs to the family Philomedidae. Accordingly, the ontogeny of six

species of five genera of four different families from Japan was clarified.

Descriptions

Vargula hilgendorfii (G. W. Muller, 1890)(Figs. 1-11)

Cypridina hilgendorfti G. W. Muller 1890, p. 228-230, pl. 25, fig. 9, pl. 26, fig. 1-3, pl. 27,

(145)

Sh. HIRUTA

Fig. 1 Vargula hilgendorfii. Male. 1. first antenna ; 2. ditto, distalpart. Female. 3. distal part of first antenna ; 4. upper lip ; 5.rod-shaped organ and median eye.

fig. 23, 30 ; Kajiyama, 1912, p. 610, 611, pl. 9, fig. 1-8. Cypridina (Vargula) hilgendorfii :Skogsberg, 1920, p. 247. Vargula hilgendorfii : Poulsen, 1962, p. 178-181, fig. 90. With regardto the complete bibliography for this species, see Hanai et al., 1977 .

Supplementary description of adults.

Female. Campace about 3.43 mm in length, about 2.33 mm in height. First antenna (Fig.1—3). Sensory bristle of fifth segment with nine long proximal and two short distal filamentsand two terminal filaments. Second antenna (Fig. 2—1—3). Protopodite with medial bristle.

(146)

Larvae of Vargula and Euphilomedes

Kg. 2 Vargula httgendorfii. Female. 1. second antenna ; 2. ditto.endopodite ;3. exopodite of second antenna ; 47mandTble75.'

part of maxillar endopodite ; 6. main tooth of-fifth'iimb.'

SES^r=^^^ s sand t^o p.. ^p^:;':u::':u:,eXZ^ ^slc:;:ting of antenor unpa-red part

."feJF18;2:^ .Exopodite as Iong asdorsal m^'°°"'"t endopodite segment: th,rdendopod,te s^ent ..th three-claws and'fou; b"s;:'°Z^^^'t^^^^

(147)

Sh. HIRUTA

Fig. 3 Vargula hilgendorfii. Female. 1. sixth limb ; 2. seventh limb ;3. furca ; 4. genitalia. Male. 5. copulatory appendage.

segment with two large teeth on cutting edge, one pulmose a—bristle, and two /?—bristles, of

which one is short, slender ; second segment with four a—bristles and eight pectinate bristlesalong distal margin. Fifth limb (Fig. 2—6). Main tooth with six constituent teeth and proximalpeg. Sixth limb (Fig. 3—1). Epipodial appendage with five short bristles. Seventh limb (Fig.3—2) with a total of 23 bristles. Furca (Fig. 3—3). Each lamella with about 13 claws ; claw 2continuous with lamella, others separated from lamella by suture. Genitalia (Fig. 3—4) as shownin figure. Rod-shaped organ and median eye (Fig. 1—5). Rod-shaped organ short, pear-shaped.

Male. Carapace about 2.78 mm in length, about 1.90 mm in height. First antenna (Fig. 1—

1,2) : b— bristle with stout proximal filament furnished with a swollen basis and a large sucker,and with two following filaments which are longer and slenderer, and provided with six and fivesmall suckers respectively ; c—bristle with sucking organs as in b—bristle. Second antenna to

seventh limb similar to female. Copulatory limb (Fig. 3—5) as shown in figure.Specimens examined. A number of specimens were collected by Dr. I. Okubo from

Mukaijima Islet, Hiroshima Pref. (11—VIII—76). Three females and two males were selectedand examined.

First larval stage (A—5 instar ; sex undetermined).Carapace (Fig. 4—1) about 0.88 mm in length, about 0.59 mm in height, similar to adult in

shape. First antenna (Fig. 5—1) similar to adult in total appearance ; surface of second segment

with short hairs and a row of hairs along distal margin ; fourth segment without bristles ; sensory

(148)


Fig. 4 Vargula hilgendorfii. 1-5. first to fifth larval stages. 1-4.sex undetermined ; 5. male.

bristle of fifth segment without filaments. Second antenna (Fig. 5—2,3) similar to adult ; firstendopodite segment without bristles ; bristle of second exopodite segment with a row of severalteeth along ventral margin ; ninth segment with basal spine and two bristles, of which one isshort.

Mandible (Fig. 5—4). Coxale endite semitriangular, with a number of spinules ; dorsalmargin of basale with one midbristle and two subterminal bristles ; ventral margin of basale with

one proximal and two distal bristles. Exopodite as long as dorsal margin of first endopoditesegment, with a hairy process and two bristles. Ventral margin of first endopodite segment withtwo bristles ; second segment long, with one proximal stiff hair, two short bristles and three longbristles on proximal half of dorsal margin, and with one short subterminal bristle on ventralmargin ; end segment small, with four bristles of an equal length.

Maxilla (Fig. 6—1,2). First endite with four bristles ; second one with four bristles ; thirdone with six bristles. Basale with one bristle on ventral margin. Exopodite with one proximaland two distal bristles, of which one is pulmose. Endopodite : first segment with one a—bristle,one /?—bristle, and two processes near base of /?—bristle ; end segment with two a—bristles and

three pectinate terminal bristles.Fifth limb (Fig. 6—3). First endite with one bristle and one process terminating in a sharp

point ; second one with three bristles and one process ; third one with four bristles. Exopodite :first segment with one stout bristle and main tooth which is composed of one tooth ; second onewith two stout bristles ; third one with two bristles on outer lobe and one bristle on inner part ;fourth one with two distal bristles and a small hairy process. Sixth limb (Fig. 6—4) small,leaf-like, with long marginal hairs. Seventh limb not observed. Furca (Fig. 6—5). Each

lamella with four or five claws. Rod-shaped organ (Fig. 5—5) similar, to adult. Upper Up (Fig.6—6) similar to adult except for small number of glandular openings.

(149)

Sb. WRUTA

...47man^ble'-0-

(150)


Fig. 6 Vargula hilgendorfii. First larval stage (A-5 instar). 1.endopodite and exopodite of maxilla ; 2. endite of maxilla ; 3.distal part of fifth limb ; 4. sixth limb ; 5. furca ; 6. upper lip.

Second larval stage (A—4 instar ; sex undetermined).

Carapace (Fig. 4—2) about 1.12 mm in length, about 0.73 mm in height. First antenna (Fig.7— 1). One dorsal bristle added to fourth segment; sensory bristle of fifth segment with two longproximal and two distal filaments, terminating in bifurcate tip ; c—, f—, and g—bristle withfilaments. Second antenna (Fig. 7—2—4). First endopodite segment with one bristle. Ninthsegment of exopodite with three bristles ; fourth to ninth segments with basal spines. Mandible(Fig. 7—5). Ventral margin of basale with two proximal bristles and three distal bristles, ofwhich one is very short ; dorsal margin of second endopodite segment with four bristles and twohairy short bristles ; end segment with two claws and three bristles. Maxilla (Fig. 8—1).Second endopodite segment with three a—bristles and six pectinate bristles along distal margin.Fifth limb. Main tooth with two constituent teeth. Sixth limb (Fig. 8—2) with two lobes ; small

(151)

Sh. HIRUTA

Fig. 7 Vargula hilgendorfii. Second larval stage (A-4 instar). 1.first antenna ; 2. endopodite of second antenna ; 3. distal partof exopodite of second antenna ; 4. bristle of second exopoditesegment of second antenna ; 5. mandible.

antenor one with one bristle and some marginal long hairs ; large posterior one covered with long

hairs on surface ; one proximal bristle present on posterior margin near base of large lobe"

Seventh Umb (Fig. 8-3) forming a small thumb-like process. Furca (Fig. 8-4). EachTamellawith five claws.

Third larval stage (A ~ 3 instar ; sex undetermined).

Carapace (Fig. 4-3) about 1.46 mm in length, about 0.96 mm in height. First antenna (Fig.9-1). One ventrodistal bristle added to fourth segment ; sensory bristle of fifth segment withfour long proximal and two short distal filaments. Second antenna (Fig. 9-2). First"endopodite

segment with one proximal and one distal bristles. Mandible (Fig. 9-3). Ventral margin ofbasale with two proximal bristles and five bristles, of which two are very short and distalmost one

(152)


Fig. 8 Vargula hilgendorfii. Second larval stage (A—4 instar). 1.maxilla ; 2. sixth limb ; 3. seventh limb ; 4. furca.

is long with stiff hairs in the midst. Maxilla (Fig. 9—4). First endopodite segment with two,3—bristles ; end segment with three a—bristles and total seven pectinate bristles along distalmargin. Fifth limb. Main tooth with three constituent teeth. Sixth limb (Fig. 9—5) similar toadult; epipodial appendage with two bristles ; first endite with one bristle ; second one with threebristles ; third one with three bristles ; fourth one with one bristle ; end segment with five bristlesand long hairs along ventral margin. Seventh limb (Fig. 9—6) elongate, bare. Furca. Each

lamella with six or seven claws.

Fourth larval stage (A—2 instar ; sex undetermined).

Carapace (Fig. 4—4) about 1.90 mm in length, about 1.23 mm in height. First antenna (Fig.10—1). Sensory bristle of fifth segment with six proximal and two short distal filaments. Firstendopodite segment of second antenna (Fig. 10—2) with two proximal and one distal bristles.Mandible similar to adult. Maxilla (Fig. 10—3). Second endopodite segment with four a—bristles, seven pectinate bristles and one short slender bristle. Fifth limb. Main tooth with fourconstituent teeth. Sixth limb (Fig. 10—4). Epipodial appendage with three bristles ; first enditewith one bristle ; second one with four bristles ; third one with three bristles ; fourth one with twobristles ; end segment with six pulmose bristles. Seventh limb (Fig. 10—5) with two cleaning

(153)

Sh.HWUTA

^3 instar). ^ Lstage ^^ :"3 central

"•'

len£po^;5-!

(154)

Larvae of y,ar"'aandEWo,

'edes

Fi8-10 Varg^^

(155)

Sh. HIRUTA

Fig. 11 Vargula hilgendorfii. Fifth larval stage (A-l instar). Mzde.1. sixth limb ; 2. seventh limb ; 3. copulatory appendage.

bristles ; terminal comb with three teeth ; one peg present opposing comb. Furca. Each lamellawith nine claws.

Fifth larval stage (A—l instar).Male. Carapace (Fig. 4—5) about 2.43 mm in length, about 1.65 mm in height. Sensory

bristle of first antenna with seven or eight long proximal filaments. First endopodite segment ofsecond antenna with three proximal and one distal bristles. Mandible and maxilla similar toadult. Fifth limb. IVtain tooth with five constituent teeth. Sixth limb (Fig. 11—1) similar toadult ; epipodial appendage with four bristles. Seventh limb (Fig. 11—2) similar to adult ; eachcleaning bristle tapering distally, with two to four bells ; terminal comb with six teeth ; one pegpresent opposing comb. Furca. Each lamella with ten claws. Copulatory limb (Fig. 11—3)composed of three lobes, which have one or two short bristles.

Female. Structures of carapace and appendages except for genital organ were almost same

as in male of A—1 instar.

Remarks. Okada and Kato (1946) have already reported that the present species certainlyhas five different larval stages, in the study on the life history of this species.

Specimens examined. A—5—A—1 instars (11—VIII—'76) IVEukaijima, I. Okubo leg.

Euphilomedes nipponica Hiruta, 1976(Figs. 12-23)

Euphilomedes nipponica Hiruta, 1976, p. 580—589, fig. 1—6.

First larval stage (A—5 instar ; sex undetermined).Carapace (Fig. 12—1) similar to adult female in shape, about 0.63 mm in length, about 0.46

(156)


Fig. 12 Euphilomedes nipponica. 1—5. first to fifth larval stage. 1,2.sex undetermined ; 3—5. female.

mm in height. First antenna (Fig. 13—1) similar to about female in general appearance ; secondand fourth segments without bristles ; a row of hairs present along distal margin of secondsegment ; bristles of fifth to end segments without filaments. Second antenna (Fig. 13—2)similar to adult female. Endopodite two-segmented ; first segment without bristles. Mandible(Fig. 13—3) similar to adult femade ; coxale endite well-developed ; ventral margin of basale withsome groups of hairs, and without bristles ; exopodite well-developed ; ventral margin of firstendopodite segment with two bristles ; dorsal margin of second segment with four bristles ;ventral margin of second segment with one subterminal bristle ; end segment with two claws andtwo bristles.

Maxilla (Fig. 13—4) similar to adult female ; first endite with six bristles ; second one withfive bristles ; third one with four bristles ; basale with one ventral bristle ; exopodite with threeterminal bristles of different lengths ; first endopodite segment with one a—bristle and one /3—bristle ; end segment with five bristles, of which one is short, claw-like. Fifth limb (Fig. 13—5)similar to adult female except for small number bristles ; inner lobe of third exopodite segmentwith one short bristle ; outer lobe of third segment with two bristles ; fourth and fifth segmentswith two stout terminal bristles. Sixth limb (Fig. 13—6) small, leaf-like, with six protuberanceswhich are provided with long hairs. Seventh limb not observed. Furca (Fig. 13—7). Eachlamella with two claws and one proximal claw-like process, which is hairy and continuous with

lamella ; posterior margin of lamella with hairs. Rod-shaped organ (Fig. 13—8) elongate, as shown

in figure.

Second larval stage (A—4 instar ; sex undetermined).

Carapace (Fig. 12—2) about 0.75 mm in length, about 0.55 mm in height. First antenna (Fig.

(157)

Sh. HIRUTA

- sSSff^S5^median eye' . »^p..t •, one dorsodistal br

.- °"ir:.^:;^s=S^:S^^SSisîSVeriral mar? "i basall7^7n oTsecond ^^^ê br>stle and three d^^Sî^S^T^ one is short.^ MWUÎ!°^ t,m6 (Fig. 14-6)asêe'pr°ot"berances «h:S^!sS^===':?;ovidedwâu3',la^-.- ^

LarWO^.W,ÊupM

omedes

3u ~" ° /•' /• J\VM^

KE-U^^^J '"' '^/^" §?ssS£?»"^s.'.^

Kmb ;9:faâa& •• 6. fif"'^Tna7;',tTC?nd ênnT,â°d some „„„... .. ""'urca' ^"""o''7'suy"'mb~ê'^

':=!=9ss^^^teni^^^ ^^._ ~ ~ """" ws- u~l) s"""ar"to":duTe"a with f've ^

pemaie. ^rZuge (A^3 ins^).

^"^. 2TT& 12:^bout 0.93 _ ,,

sy^'sssSssrl& 16~1)' and^^"'OT,STent ?itA two

(159) "" ^" ^~~2^ similar to

Sh. HIRUTA

Fig. 15 Euphilomedes nipponica. Third larval stage (A—3 instar).Female. 1. rod-shaped organ ; 2. first antenna ; 3. second

antenna ; 4. mandible.

adult female except for somewhat smaller number of bristles. Sixth limb (Fig. 16—3) well-developed, similar to adult female. Seventh limb (Fig. 16-4) elongate, bare. Furca (Fig. 16-5)similar to adult female ; third claw short, as long as fifth to seventh ones. Rod-shaped organ (Fig.15—1) similar to adult female.

Male. Second antenna. Endopodite (Fig. 17—1) weakly three-segmented ; first segment

with three short bristles ; end segment with one short distal bristle. Other structures almostsame as in female of A—3 instar.

Fourth larval stage (A—2 instar).

Female. Carapace (Fig. 12-4) about 1.21 mm in length, about 0.86 mm in height Firstantenna (Fig. 18—2) almost Same as in adult. Second antenna (Fig. 18—3). First endopoditesegment with three proximal and one distal bristles ; ninth segment of exopodite with five bristlesof different lengths. Median eye and rod-shaped organ (Fig. 18—1), mandible (Fig. 19—1),maxilla (Fig. 19-2), fifth limb (Fig. 19-3), sixth limb (Fig. 19-4), and furca (Fig. 19-6) similarto adult female. Seventh limb (Fig. 19—5) furnished with total eight cleaning bristles ; each

(160)


Fig. 16 Euphilomedes nipponica. Third larval stage (A—3 instar).Female. 1. maxilla ; 2. fifth limb ; 3. sixth limb ; 4. seventhlimb ; 5. furca.

bristle tapering distally, with marginal spines and one to three bells.Male. Endopodite of second antenna (Fig. 17-2) three-segmented ; first segment with three

proximal and one distal bristles ; second one longer than third, with a distal short bristle andproximal long one ; third one with minute bristle on middle of posterior margin and short distalbristle. Other structures almost same as in female of A—2 instar.

Fifth larval stage (A—l instar).Female. Carapace (Fig. 1.5) about 1.50 mm in length, about 1.11 mm in height. First

antenna (Fig. 20-2), mandible (Fig. 20-5), maxilla, fifth Limb (Fig. 20-6), sixth limb (Fig. 20-7), furca, and rod-shaped organ similar to adult female. Second antenna (Fig. 20—3,4). First

endopodite segment with four proximal bristles and one distal bristle ; ninth segment of exopoditewith six bristles. Seventh limb (Fig. 20—8) with ten bristles, six distally, four proximally.

Male. Second antenna (Fig. 21—3,4). Endopodite three-segmented ; first segment with

four proximal bristles and a distal one ; second segment elongate, somewhat longer than third,with long proximal bristle and two short bristles on middle of anterior surface ; third one with oneshort bristle near middle of posterior surface and two short juxtaposed terminal bristles. Lateral

(161)

Sh. HIRUTA

Fig. 17 Euphilomedes nipponica. Male. 1. endopodite of secondantenna of third larval stage (A—3 instar) ; 2. endopodite ofsecond antenna of fourth larval stage (A—2 instar).

Fig. 18 Euphilomedes nipponica. Fourth larval stage (A—2 instar).Female. 1. rod-shaped organ and median eye ;2. first antenna3. second antenna.

(162)


Fig. 19 Euphilomedes nipponica. Fourth larval stage (A—2 instar).Female. 1. mandible ; 2. maxilla ; 3. fifth limb ; 4. sixth limb5. seventh limb ; 6. furca.

eye (Fig. 21-5) developed, with ommatidia. Seventh limb (Fig. 23—3) with a total of eightcleaning bristles, four distally, four proximally. Other structures were almost same as in female

of A-l instar : first antenna (Fig. 21-2), mandible (Fig. 22-1). maxilla (Fig. 22-2-5), fifthlimb (Fig. 23-1), sixth limb (Fig. 23-2), and furca (Fig. 23-4).

Remarks. Since five different larval stages were detected by the investigation of the shellsize and appendage morphology and, further, specimens which had just hatched out were alsoexamined, the present species certainly passes through five moults before reaching maturity.

Sex is easily determinable by the structure of the endopodite of the second antenna in the lastthree larval stages.

Specimens examined. The specimens were collected from the bottom sediment of muddysand (0-4 m depths) sampled at Oshoro, on the Japan Sea coast of Hokkaido by means of thedecanting and sieving method. A-5 instars hatched from eggs of a female (11-VI-75) ; A-

(163)

Sh. HIRUTA

20 SUMmede\nippomca- Flfth larval stage (A-l instar).e.^,rcdjhapedorgan and medlan eye =2. first"antenna

ienjlopoditeofsecon^ '• ^.'nmtoseg^nFof^^nTi^Tna; 5-mandlble; 6. fifth limb ; 7. sixth'UmbTrseven^th

(164)


Fig. 21 Euphilomedes nipponica. Fifth larval stage (A—l instar).Male. 1. rod-shaped organ ; 2. first antenna ; 3. exopodite ofsecond antenna ; 4. protopodite and endopodite of secondantenna ; 5. lateral eye.

4 instars (11-VI-75) ; A-3 instars (10-IX-75) ; A-2 instars (10-IX-75) ; A-l instars(27-V-75) Sh. Hirutaleg.

Discussion

It is ascertained that the present two species, as described above, pass through five moults(A—5 to adult stage) before reaching maturity. In the family Cypridinidae, to which Vargulahilgendorfii belongs, some members possessing five or six different larval stages are hithertoknown (Doloria pectinata, Macrocypridina castanea, and Gigantocypris- species), and in the familyPhilomedidae, which contains Euphilomedes nipponica, it is known that Philomedes globosus has

five different larval stages (Kornicker, 1969).

The morphological differentiation of the sixth and seventh limbs in the present two speciesalmost accords with that designated in the key to early myodocopid instars (Kornicker, op. cit).However, it is noticeable that in Vargula hilgendorfii, the sixth limb of the second larval stage(A—4 instar) is provided with two bristles, of which one arises from the anterior lobe and theother from the posterior margin of the limb, while in Kornicker's key, the "6th limb with one

(165)

Sh. HIRUTA

Fig. 22 Euphilomedes nipponica. Fifth larval stage (A—l instar).Male. 1. mandible ; 2. endopodite of maxilla ; 3. first endite ofmaxilla ; 4. second endite of maxilla ; 5. third endite of maxilla.

bristle" characterizes the second larval stage. The occurrence of bristles on the fourth segment

ourth of the first antenna in these species entirely accords with that of other early myodocopidinstars so far known. Namely, in the first larval stage, the fourth segment is without any bristles.

In the second stage, the segment is provided with one dorsodistal bristle, and then in the nextstage, one bristle is added to the ventrodistal edge. Therefore, this characteristic of the firstantenna seems to be also useful for the identification of early myodocopid instars.

Acknowledgements

I would like to express my sincere gratitude to Professor Mayumi Yamada of HokkaidoUniversity for his advice and guidance. Cordial thanks are also due to Dr. I. Okubo of BiologicalLaboratory, Okayama Shujitsu Junior College, who kindly sent me many specimens of Vargulahilgendorfii from Mukaijima Islet, Hiroshima Pref.

(166)


Fig. 23 Euphilomedes nipponica. Fifth larval stage (A—instar).Male. 1. fifth limb ; 2. sixth limb ; 3. seventh limb ; 4. furca.

References

Hanai, T., Ikeya, N., Ishizaki, K., Sekiguchi, Y., and Yajima, M. 1977. Checklist of Ostracoda from Japan and its

adjacent seas. Bull., Univ. Mus. Univ. Tokyo 12, 120 pp.

Hiruta, Sh. 1976. Euphilomedes nipponica n. sp. from Hokkaido, with a redescription of E. sordida (G. W. Muller)(Ostracoda : Myodocopina). J. Fac. Sci. Hokkaido Univ. Ser. 6, Zool. 20 : 579-599.

Hiruta, Sh. 1977. A new species of the genus Sarsiella Norman from Hokkaido, with reference to the larvel stages

(Ostracoda : Myodocopina). Ibid. 21 : 44—60, pl. 4.

Hiruta, Sh. 1978. Redescription of Sarsiella misakiensis Kajiyama from Hokkaido, with reference to the larvalstages (Ostracoda : Myodocopina). Ibid. 21 : 262-278.

Hiruta, Sh. 1979 (a). A new species of the genus Bathyleberis Kornicker from Hokkaido, with reference to thelarval stages (Ostracoda : Myodocopina). Ibid. 22: 99—121.

Hiruta, Sh. 1979 (b). Redescription of Asteropteron fuscum (G. W. Muller) from Amakusa, Kyushu, with referenceto the larval stages (Ostracoda : Myodocopina). Proc. Jap. Soc. Syst. Zoology. 17 : 15—30.

Kajiyama, E. 1912. The Ostracoda from Misaki ; Part 2, Myodocopa. Zool. Mag., Tokyo (Dobutsugaku-zasshi) 24

: 609-619, pl. 9, (in Japanese).

Kornicker, L. S. 1969. Morphology, ontogeny, and intraspecific variation of Spinacopia, a new genus of myodo-

copid ostracod (Sarsiellidae). Smiths. Contr. Zool. 8 : 1—42, 4 pis.

Muller, G. W. 1890. Neue Cypridiniden. Zool. Jahrb. System. 5 : 211-252, pl. 25-27.

Okada, Y. and Kato, K. 1946. Studies on luminous animals in Japan, III. Preliminary report on the life history ofCypridina hilgendorfii. Kagaku 16 : 64—66, (in Japanese).

Poulsen, E. M. 1962. Ostracoda-Myodocopa ; Part 1. Cypridiniformes-Cypridinidae. Dana Reports 57 : 1—414.

Skogsberg, T. 1920. Studies on marine Ostraeods, 1. Cypridinids, Halocyprids, and Polycopids. Zool. Bidragfran Uppsala, suppl. 1 : 1—784.

(167)

ミオドコーピナ亜目に属する貝虫類2種の幼生期の形態について...

Documents