Gonad morphology of Susan's dwarfgoby Eviota susanae

2016 ◽  
Vol 89 (3) ◽  
pp. 1839-1844
Author(s):  
E. Schemmel ◽  
K. Cole
Keyword(s):  
Gonad Morphology

Gonad morphology and gametogenesis in the deep-sea jellyfish Atolla wyvillei and Periphylla periphylla (Scyphozoa: Coronatae) collected from Cape Hatteras and the Gulf of Mexico

2009 ◽  
Vol 90 (6) ◽  
pp. 1095-1104 ◽  
Author(s):  
Cathy H. Lucas ◽  
Adam J. Reed
Keyword(s):  
Gulf Of Mexico ◽  
Gonad Development ◽  
Bell Diameter ◽  
Western Atlantic ◽  
Gonad Morphology ◽  
Time Period ◽  
Cape Hatteras ◽  
Literature Evidence ◽  
Long Time ◽  
North Western

Observations on gonad morphology and the structure of ovaries and testes of the coronate scyphozoans Atolla wyvillei and Periphylla periphylla are described based on samples collected from the Gulf of Mexico and Cape Hatteras (north-western Atlantic). In A. wyvillei, gonads of distinguishable sex were observed in medusae as small as 17 mm bell diameter (BD). Spermatogenesis occurred within follicles (average 366 × 254 μm) that were evenly distributed throughout the gonad. Oocytes in different stages of development were observed in all the females with gonads. Oocytes arise from the gastrodermis and migrate into the mesoglea to develop from early-mid to late vitellogenic oocytes characterized by a large nucleus and granular (organic-rich) cytoplasm. The largest oocytes measured were 543 μm and 263 μm from the Gulf of Mexico and Cape Hatteras respectively. Possible reasons for this difference are discussed. In P. periphylla gonads were also initially observed in medusae 17 mm BD, although not all larger medusae had obvious gonads. Unlike A. wyvillei sperm follicles were arranged in long convoluted rows normally only one follicle thick. The organization of ooytes in female P. periphylla was very similar to A. wyvillei, although the gonads were small and the number of oocytes present in each gonad very low (<22). The largest oocyte measured was 777 μm in a 53 mm BD medusa. Although medusae were collected from one time period only (September) in this study, our findings appear to be in agreement with literature evidence indicating that coronate jellyfish produce few eggs continuously over a long time period. Aspects of gonad development and gametogenesis are discussed with respect to potential differences in site productivity and species identification.

A new hydrozoan, Geomackiea zephyrolata gen. nov., sp. nov. (Anthomedusae: Pandeidae), from inland marine waters of British Columbia and Washington State

1985 ◽  
Vol 63 (9) ◽  
pp. 2172-2175
Author(s):  
Claudia E. Mills
Keyword(s):  
British Columbia ◽  
New Genus ◽  
Washington State ◽  
Marine Waters ◽  
Gonad Morphology ◽  
Saanich Inlet ◽  
The Family ◽  
Friday Harbor ◽  
Vertical Distributions

The hydromedusa Geomackiea zephyrolata gen. nov., sp. nov. is described and illustrated. It has been placed in the subfamily Protiarinae of the family Pandeidae on the basis of its stomach and gonad morphology and the four large perradial tentacles with conical basal bulbs. A new genus has been erected because the medusa is supplied with four broad interradial bulbs, each rimmed by up to eight closely packed solid tentaculae. A total of 29 specimens with bell heights of 0.9–3.5 mm have been collected in the plankton of Saanich Inlet, British Columbia, and Friday Harbor, Washington, between 1978 and 1981. Juvenile as well as adult specimens are described and the cnidome, gametes, seasonal and vertical distributions, and taxonomic affinities within the family Pandeidae are discussed.

scholarly journals Gonad morphology, oocyte development and spawning cycle of the calanoid copepod Acartia clausi

2007 ◽  
Vol 61 (3) ◽  
pp. 193-201 ◽  
Author(s):  
Sonja M. Eisfeld ◽  
Barbara Niehoff
Keyword(s):  
Calanoid Copepod ◽  
Oocyte Development ◽  
Acartia Clausi ◽  
Gonad Morphology ◽  
Spawning Cycle

Gonad Morphology of the Hermaphroditic Fish Diplectrum pacificum (Serranidae)

Copeia ◽  
1977 ◽  
Vol 1977 (3) ◽  
pp. 448 ◽  
Author(s):  
Stephen A. Bortone
Keyword(s):  
Gonad Morphology

Reproductive performance and mature gonad morphology of triploid and diploid Black Tiger shrimp (Penaeus monodon) siblings

2012 ◽  
Vol 44 (10) ◽  
pp. 1493-1501 ◽  
Author(s):  
Melony Sellars ◽  
Andrew Wood ◽  
Brian Murphy ◽  
Greg Coman ◽  
Stuart Arnold ◽  
...  
Keyword(s):  
Reproductive Performance ◽  
Penaeus Monodon ◽  
Black Tiger Shrimp ◽  
Mature Gonad ◽  
Gonad Morphology ◽  
Tiger Shrimp

scholarly journals A Novel Growth Retardation and Abnormal Gonad Morphology Locus on Mouse Chromosome 4

2009 ◽  
Vol 100 (3) ◽  
pp. 380-385 ◽  
Author(s):  
J.-I. Suto
Keyword(s):  
Mouse Chromosome ◽  
Growth Retardation ◽  
Chromosome 4 ◽  
Gonad Morphology

scholarly journals The C. elegans heterochronic gene lin-28 coordinates the timing of hypodermal and somatic gonadal programs for hermaphrodite reproductive system morphogenesis

2018 ◽  
Author(s):  
Sungwook Choi ◽  
Victor Ambros
Keyword(s):  
Control Cell ◽  
Gonad Development ◽  
Developmental Timing ◽  
Specific Cell ◽  
Cell Fates ◽  
C Elegans ◽  
Gonad Morphology ◽  
Somatic Gonad ◽  
Heterochronic Gene ◽  
A Cell

AbstractC. elegans heterochronic genes determine the timing of expression of specific cell fates in particular stages of developing larva. However, their broader roles in coordinating developmental events across diverse tissues has been less well investigated. Here, we show that loss of lin-28, a central heterochronic regulator of hypodermal development, causes reduced fertility associated with abnormal somatic gonad morphology. In particular, the abnormal spermatheca-uterine valve morphology of lin-28(lf) hermaphrodites trap embryos in the spermatheca, which disrupts ovulation and causes embryonic lethality. The same genes that act downstream of lin-28 in the regulation of hypodermal developmental timing also act downstream of lin-28 in somatic gonad morphogenesis and fertility. Importantly, we find that hypodermal expression, but not somatic gonadal expression, of lin-28 is sufficient for restoring normal somatic gonad morphology in lin-28(lf) mutants. We propose that the abnormal somatic gonad morphogenesis of lin-28(lf) hermaphrodites results from temporal discoordination between the accelerated hypodermal development and normally timed somatic gonad development. Thus, our findings exemplify how a cell-intrinsic developmental timing program can also control cell non-autonomous signaling critical for proper development of other interacting tissues.

scholarly journals INTERACTIONS BETWEEN SEX-TRANSFORMATION MUTANTS OF DROSOPHILA MELANOGASTER. I. HEMOLYMPH VITELLOGENINS AND GONAD MORPHOLOGY

Genetics ◽  
1981 ◽  
Vol 99 (3-4) ◽  
pp. 429-441
Author(s):  
T Ota ◽  
A Fukunaga ◽  
M Kawabe ◽  
K Oishi
Keyword(s):  
Gel Electrophoresis ◽  
Fat Body ◽  
Biochemical Marker ◽  
Polyacrylamide Gel Electrophoresis ◽  
Body Cavity ◽  
The Body ◽  
The Other ◽  
Sexually Dimorphic ◽  
Gonad Morphology ◽  
Sex Transformation

ABSTRACT In Drosophila, vitellogenins (yolk protein precursors) are synthesized by the female fat body, secreted into the hemolymph and subsequently taken up by the developing oocytes. The male fat body, on the other hand, does not do this even when immature ovaries are transplanted into the body cavity and grow. Thus, the hemolymph vitellogenins serve as an easily detectable sexually dimorphic biochemical marker.——We have examined hemolymph vitellcgenins by SDS polyacrylamide gel electrophoresis in flies carrying various sex-transformation mutants (dsx, tra, tra-2 and tra-20TF) singly and in all possible combinations. Chromosomal females homozygous for tra or tra-2 have no detectable hemolymph vitellogenins, while those homozygous for tra-20TR exhibit appreciable levels of these proteins. Flies homozygous for dsz, bothX / X and X / Y, have hemolymph vitellogenins, although the amount is consistently smaller in the latter. Indeed, X / Y; dsx/dsx is the only genotype in which hemolymph vitellogenins are detected in the X/Y flies. A clear hierarchy of epistasis exists among these sex-transformation mutants when they are examined in various combinations: dsx &gt; tra, tra-2 &gt; tra-20TF. Moreover, an interaction between tra-20TF and tra was seen in these experiments: X / X; tra-20TF/tra-20TF flies show the presence of only a trace of hemolymph vitellogenins when they are made heterozygous for tra. These results, combined with observations on gonad morphology, are discussed with respect to the BAKERa nd RIDGE (1980) hypothesis of sex determination.

Ecology, Biology and Gonad Morphology of Gerris rufoscutellatus (Hemiptera: Gerridae) in Fairbanks, Alaska

1971 ◽  
Vol 86 (2) ◽  
pp. 407 ◽  
Author(s):  
Tohko Kaufmann
Keyword(s):  
Gonad Morphology
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