EMBRYOGENESIS OF TEREBRANTIAN THRIPS，FRANKLINIELLA INTO
盟主
(THYSANOPTERA，THRIPIDAE)

Kaori Anan and Kazuo Haga，University of Tsukuba，

工nstitute of Bio1ogica1 Sciences

Sakura‑mura，
工 baraki，305 Japan

U1janin in 1874 pub1ished brief obs巴 rvation on embryonic deve10pm巴 nt ofTer巴 brantia and since that time this suborder was comp1ete1y n巴 gl巴 cted， whi1巴
species of another suborder Tubulifera were studied quite recent1y (Bournier，1966; Heming，1979，1980; Haga，1985).

In this study the authors d巴 scribe

gross embryogenesis of popular flower thrips， Franklinie11~

旦.
!tons豆 (Trybom)

of suborder Terebrantia.
The females of the species stud工ed，like most of terebrantian th工 ips，layeggs singly in plant tissues by means of saw‑1ike ovipositor，and it waseasily to collect eggs by Murai's (1982) method.
The freshly laid egg is kidney‑like 工n shape， about 0.26 mm long and0.
1 mm wide. The developmental period lasts about 100 hr at temperature 25 C，and may be divid巴 d into 12 following stag巴 s.

Stag巴 1. (0‑10 hr after oviposition)

Cleavage and blastoderm formation.

The cleavage c巴 nter is localized near the egg center.
Stage 2. (10‑14 hr)
areas.

D工 fferentiation of the embryonic and extraembryonic

The embryonic area is formed at the ventra1 egg surfac巴 near its

posterior pole.
Stage 3. (14‑18 hr)

Formation of germ‑band. The embryonic area invagi

nates into the yolk at the posterior pole of the egg， and germ‑bandformation begins.
Stage 4. (18‑24 hr)

Appearance of appendage anlagen of germ‑band.

Duringthe germ‑band elongation，near th巴 anterior pole of th巴 egg，gnathal appen‑3334dages appear as mere swellings followed by antennal ones.
Germ…band at its gr日atest length.

stage 5. (24‑32 hr)

The germ‑band shows

double sigmoid form，in 1品七色 ral view. Appendages of 9邑 rm‑band begin to田et昌 merize.
Pre‑revolution stage. The abdomen of the embryo isStage 6. (32‑46 hr)

flatten巴 d and flexed in U明日 hape. The serosal cuticle begins to form，andthe anterior swelling of the egg becomes distinct.
王七品 tr告 psis.
Ke. (46‑50 hr)
S七昌 ge 7
fusing point.

Embryonic envelopes rupture 品七 their

Head and gn日七 hal region日 move anteriorward，and the abdomen

posteriorward still remains in a flex日d form.

The embryonic rotation was

not observed during katatrepsis.
Post‑revolution stage. The secondary dorsal organ

stage 8. (50 56 hr)勾

begins to disappe昌 r，呈 nd dors丑 1 closure proce邑 ds.
Completion of dorsal closure. Dorsal closure end色 d.

stage ヲ. (56‑64 hr)

Fourommatidia begin to form in the ey日 area.
Midωgut formation.

stag巴 10. (64ω72 hr)

Mouth‑cone is formed by modified， and 昌 ntennae move to their definite position.

守nathal app
日ndages

Mid‑gut

is formed in r告 sult of bipolar origin.
ニage 1
1. (72ω86 hr)
stCompletion of 1st instar larva. The larval cut工 cle

is secreted over the full grown embryo.

S日 tae are formed，and hypod巴 rmal

pigments deposited.
Stag告 12. (86‑100 hr)
s~ぜ elledHatching.

The 1st instar larva h丑七 ches out throughpart of the 号 gg，after m呂 ny its reciprocal befor在 一 behind movemets.

R日f日 rences
Bournier，A. (1ヲ66) Ann. Soc. ent. Fr. (N. S.)，11:415 435.
Haga，K. (1ヲ85) 工n Recent Advances in Insect Embryology in Japan (Ed. Ando &Miya)， Isebu， pp.45ω106.
日目 ming，B.S. (1979) J. Morphol.
，吟ーーーーーーーーーー

160:323‑343.

(1980) J. Morphol.， 164:235‑263.

Uljan工 n，W.N. (1874) 工zvi畠 stiia 工mp. Ob. Luibit Estest. Anth. Ethnogr.，
10:39‑43.

Pr
口c.Arthropod.Embr
リol.Soc.Jpn;，
1985