Structure of the Reproductive System of the Adult Female Twospotted Spider Mite Tetranychus Urticae

Crooker, Allen; Cone, Wyatt W.

doi:10.1016/b978-0-12-592202-9.50056-2

Cited by 6 publications

(2 citation statements)

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“…Thus, the cytoplasmic bridge is suggested to be formed soon after fusion of the three sister cells but prior to the large increase in size. In this context, the description of a funicle [16][17][18] seems to be a misinterpretation because specialized funicle cells could not be observed during the present study.…”

Section: (C) Differentiation Of Cell ~Ypesmentioning

confidence: 65%

“…The development of male [12] and female germ cells of T. urticae [13][14][15][16][17] has been of special interest. The female reproductive system consists of an unpaired ovary where according to the accumulation of defined oogenesis stages a cranial germ region, a middle previtellogenic region, and a caudal vitellogenic region are distinguishable [10,13,15,18,19]. During ovarian development, different cell types are observed: oogonia, growing oocytes, nurse cells and chromatin-rich cells [10,[13][14][15][16][17].…”

Section: Introductionmentioning

confidence: 99%

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Post-embryonic development of the two-spotted spider miteTetranychus urticaewith special reference to the differentiation of the female reproductive system

Mothes-Wagner

1984

International Journal of Invertebrate Reproduction and Developm

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To cite this article: Ursula Post-embryonic development of the two-spotted spider mite Tetranychus urticae with special reference to the differentiation of the female reproductive system, International Journal of Invertebrate Reproduction and Development, 7:4,[203][204][205][206][207][208][209][210][211][212][213][214][215][216] Summary The spider mite, Tetranychus urticae passes through four active stages in its life cycle: larva, protonymph, deutonymph, adult. The duration at 23°C and 40-60% relative humidity is 10-12 days. Each of the movable stages is followed by a resting phase (=chrysalis) where moulting processes are prepared. The general internal anatomy of the developmental stages does not differ from that of the adults. The gonadial rudiment of the female larva is an undifferentiated cell mass situated between the nervous system and the anus. In the nymphochrysalis, development of oocytes starts as indicated by synaptonemal complexes occuring in cells which are interconnected via cytoplasmic bridges. Cells exhibiting extranuclear material appear during the protonymphal stage. The presumptive uterus and vagina are formed during the deutochrysalis stage and consist of an undifferentiated tube, the distal portion of which is lined by a fine cuticle. The ovary of the deutonymph contains different cell types. Oogonia and growing oocytes are found in the cranial germ region. Oocytes, nurse cells and cells with large lobed nuclei can be observed in the caudal previtellogenic region. Oocytes protrude through the ovarian surface and invade ovarian pouches covered only by the basement membrane whereby each is connected to a tri-nucleate nurse cell via a cytoplasmic bridge. Oocytes increase in size but do not form yolk droplets. The uterus and vagina are differentiated during the late deutonymphal stage and copulation may take place as indicated by the presence of sperm in the lumen or' the seminal receptacle.The results are compared to previously published information on the female reproductive system of T. urticae and discussed with reference to co-operation of ovarian cell types and their origin.

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Section: (C) Differentiation Of Cell ~Ypesmentioning

confidence: 65%