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94 results for “gonadal development”
Fig. 8 in Fig. 2. Gonadal development during Yntema stages 15, 17, 19 in Bruggmanniella sanlianensis Lin, Yang & Tokuda, 2020, sp. nov.
Fig. 8. Major chelae of Austruca perplexa (H. Milne Edwards, 1852) (A–D) and A. citrus n. sp. (E–H). A, CW 17.3 mm (NCHUZOOL 15046), Kuching, Sarawak, Malaysia; B, CW 14.9 mm (NCHUZOOL 15058), Singapore; C, CW 12.5 mm (QM W19270), Queensland, Australia; D, CW 12.0 mm (ZRC 1995.966), Queensland, Australia; E, CW 12.7 (SMF 5675), Samoa; F, CW 12.0 mm (MNHN-IU-2017-9123), Wallis & Futuna; G, CW 11.6 mm (UF 1488), Fiji; H, CW 11.0 mm (UF 1488), Fiji.
Fig. 2. Gonadal development during Yntema stages 15, 17, 19 in Bruggmanniella sanlianensis Lin, Yang & Tokuda, 2020, sp. nov.
Fig. 2. Gonadal development during Yntema stages 15, 17, 19, and 25 when incubated at the MPT (26°C) or FPT (32°C). Location of the gonad at Yntema stages (a, b) 15 (black arrows), (c) 17 (MPT), (d) 17 (FPT), (e) 19 (MPT), (f) 19 (FPT), (g) 25 (MPT), and (h) 25 (FPT). C = cortical region or outer layer of tissue immediately below the epithelium; F = ovarian follicle; M = medullar region or the inner region of the gonad which is distinguishable from the outer region; SC = medullary sex cord; ST = seminiferous tubule; an asterisk indicates an area with germ cell division; a star indicates an area with cortical development.
Fig. 2. I in Fig. 2. Gonadal development during Yntema stages 15, 17, 19 in Bruggmanniella sanlianensis Lin, Yang & Tokuda, 2020, sp. nov.
Fig. 2. I llustrations of syntypes of Gelasimus perplexus, G. annulipes and Uca annulipes var. orientalis (A–C), and specimen of A. perplexa from Borneo (D). A, Gelasimus perplexus H. Milne Edwards, 1852 (after H. Milne Edwards 1852: pl. 4(18a)); B, Gelasimus annulipes H. Milne Edwards, 1837 (after H. Milne Edwards 1852: pl. 4(15b); C, Uca annulipes var. orientalis Nobili, 1901 (after Nobili 1901: fig. A); D, specimen from Buntal, Kuching, Sarawak, Malaysia (after Maccagno 1928: fig. 21).
Fig. 1 in Fig. 2. Gonadal development during Yntema stages 15, 17, 19 in Bruggmanniella sanlianensis Lin, Yang & Tokuda, 2020, sp. nov.
Fig. 1. Collection sites for specimens of Austruca citrus n. sp. and A. perplexa (H. Milne Edwards, 1852) used in this study: blue solid squares (nos. 1–3) for A. citrus and pink solid circles (nos. 4–33) for A. perplexa (see Table 1). Blue empty square and pink empty circles indicate additional records of the two species from other references (see synonymy under A. perplexa). Different lines indicate the updated ranges of the two species.
Fig. 6. G1s in Fig. 2. Gonadal development during Yntema stages 15, 17, 19 in Bruggmanniella sanlianensis Lin, Yang & Tokuda, 2020, sp. nov.
Fig. 6. G1s of Austruca citrus n. sp. (A–D, J) and A. perplexa (H. Milne Edwards, 1852) (E–I). A–D, G–J, right G1; E–F, left G1. A, E, mesial view; B, G–J, mesial view of distal part; C, F, lateral view D, lateral view of distal part. A–D, holotype, CW 10.9 mm, MNHN-IU-2017-9121, Wallis & Futuna; J, paratype, CW 12.0 mm, MNHN IU-2017-9123, Wallis & Futuna; E–F, paralectotype, MNHN-IU-2008-10646, CW ~15–16 mm, Java; G, CW 15.2 mm, ZRC 2020.0288, Singapore; H, CW 17.5 mm, NCHUZOOL 14636; I, CW 12.5 mm, QM W19270. Scale bars: A–D = 2.0 mm; G–J = 0.5 mm.
Fig. 3 in Fig. 2. Gonadal development during Yntema stages 15, 17, 19 in Bruggmanniella sanlianensis Lin, Yang & Tokuda, 2020, sp. nov.
Fig. 3. The syntypes of Gelasimus perplexus H. Milne Edwards, 1852 (MNHN-IU-2008-10646). A–C, male paralectotype, rehydrated specimen; D–E, male lectotype, dry specimen. A, B, outer and inner surfaces of major cheliped (PL 17 mm); C, broken carapace, CW ~15–16 mm; D, carapace, CW 13.8 mm; E, outer surface of major cheliped, PL 25.7 mm.
Fig. 4 in Fig. 2. Gonadal development during Yntema stages 15, 17, 19 in Bruggmanniella sanlianensis Lin, Yang & Tokuda, 2020, sp. nov.
Fig. 4. Holotype of Austruca citrus n. sp. (MNHN-IU-2017-9121; CW 10.9 mm). A, dorsal view; B, major chela; C, pleon and telson; D, third maxillipeds. Scale bars: A, B = 5.0 mm; C, D = 2.0 mm.
Figures 1-6 in Gonadal development and fecundity of the smooth weakfish Cynoscion leiarchus (Teleostei: Perciformes: Sciaenidae) in a tropical Brazilian bay
Figures 1-6. Photomicrographs of ovarian (1-4) and testicular (5-6) histology illustrating oocytes and spermatocytes at different development stages of C. leiarchus: (1-2) regenerating ovarian phase; (3) spawning capable ovarian phase; (4) actively spawning subphase; (5- 6) spawning capable testis phase. (PG) Primary growth, (MB) muscle bundle, (CA) cortical alveolar, (OW) ovarian wall, (Vtg1) primary vitellogenic, (Vtg2) secondary vitellogenic, (Vtg3) tertiary vitellogenic, (A) atresia POF: postovulatory follicle complex, (GVM) germinal vesicula migration, (GVBD) germinal vesicular breackdown, (Sg1) primary spermatogonia, (Sz) spermatozoa, (Cy) spermatocyst.
8 9 10 11 Figures 8-11 in Gonadal development and fecundity of the smooth weakfish Cynoscion leiarchus (Teleostei: Perciformes: Sciaenidae) in a tropical Brazilian bay
8 9 10 11 Figures 8-11. Relationship between batch fecundity and gonad weight (8), total weight (9), total length (10), and age (11) of Cynoscion leiarchus in Sepetiba Bay.
Data from: Geographic differences in the phenology of gonadal development and moult, but not of egg laying, are genetically based in a small songbird
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Data from: Seasonally sympatric but allochronic: differential expression of hypothalamic genes in a songbird during gonadal development
Allochrony, the mismatch of reproductive schedules, is one mechanism that can mediate sympatric speciation and diversification. In songbirds, the transition into breeding condition and gonadal growth is regulated by the hypothalamic-pituitary-gonadal (HPG) axis at multiple levels. We investigated whether the difference in reproductive timing between two, seasonally sympatric subspecies of dark-eyed juncos (Junco hyemalis) was related to gene expression along the HPG axis. During the sympatric pre-breeding stage, we measured hypothalamic and testicular mRNA expression of candidate genes via qPCR in captive male juncos. For hypothalamic mRNA, we found our earlier breeding subspecies had increased expression of gonadotropin-releasing hormone (GnRH) and decreased expression of androgen receptor, estrogen receptor alpha, and mineralocorticoid receptor (MR). Subspecies did not differ in expression of hypothalamic gonadotropin-inhibitory hormone (GnIH) and glucocorticoid receptor (GR). While our earlier breeding subspecies had higher mRNA expression of testicular GR, subspecies did not differ in testicular luteinizing hormone receptor, follicle-stimulating hormone receptor, or MR mRNA expression levels. Our findings indicate increased GnRH production and decreased hypothalamic sensitivity to sex steroid negative feedback as factors promoting differences in the timing of gonadal recrudescence between recently diverged populations. Differential gene expression along the HPG axis may facilitate species diversification under seasonal sympatry.
Figure 8 in Gonadal development and fecundity of bogue Boops boops (Linnaeus, 1758) (Sparidae) on the central Algerian coast
Figure 8. Sex frequency distribution, based on B. boops size.
Figure 2 in Gonadal development and fecundity of bogue Boops boops (Linnaeus, 1758) (Sparidae) on the central Algerian coast
Figure 2. Monthly change of the sexual maturity stages (%) in B. boops females.
Figure 1 in Gonadal development and fecundity of bogue Boops boops (Linnaeus, 1758) (Sparidae) on the central Algerian coast
Figure 1. Location of the study.
Data from: Seasonally sympatric but allochronic: differential expression of hypothalamic genes in a songbird during gonadal development
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Figure 5 in A comparative account of the embryonic lineage and gonad development in two species of Rhabditidae (Nematoda)
Figure 5. Schematic and LM micrograph showing sequence of vulva formation in Cephaloboides anisospiculus (a, c, e, g, i, k, m) and Mesorhabditis paucipapillata (b, d, f, h, j, l, n). C, D: Second-stage juvenile showing 12 Pn.ps; e, f: third-stage juvenile showing 12 vulval precursor cells with five cells forming vulval prominence group; i, j: fourth-stage juvenile showing vulval prominence group aggregating at vulval site; k, l: moulting fourth-stage juvenile with vulval precursor cells; m, n: vulval region: o, p: SEM of vulval region. Scale bars = 10 µm.
Figure 2 in A comparative account of the embryonic lineage and gonad development in two species of Rhabditidae (Nematoda)
Figure 2. Embryonic stages in Mesorhabditis paucipapillata. a: Egg showing pronuclei before fusion (arrow pointing to the male pronucleus); b: two-celled stage; c: four-celled stage; d: rhomboid arrangement of blastomeres; e: five-celled stage; f: eight-celled stage; g: sixteen-celled stage; h, i: morula stage; j: blastula stage; k: gastrula stage; l: lima bean stage; m: comma stage; n: tadpole stage; o: plum stage; p: pretzel stage. Scale bar = 10 µm.
Figure 4 in A comparative account of the embryonic lineage and gonad development in two species of Rhabditidae (Nematoda)
Figure 4. Gonad development in Mesorhabditis paucipapillata. Genital primordium a–e, h, i. a: Firststage juvenile; b: moulting second-stage male juvenile; c: moulting second-stage female juvenile; d: third-stage male juvenile; e: third-stage female juvenile; f: tail of third-stage male juvenile showing spicular primordium; g: tail of third-stage female juvenile; h: fourth-stage male juvenile; i: fourth-stage female juvenile; j: adult male gonad; k: adult female gonad. Scale bars = 10 µm.
Figure 7 in A comparative account of the embryonic lineage and gonad development in two species of Rhabditidae (Nematoda)
Figure 7. Gonad development in Cephaloboides anisospiculus. Genital primordium a–e, h, i. a: Firststage juvenile; b: moulting second-stage male juvenile; c: moulting second-stage female juvenile; d: third-stage male juvenile; e: third-stage female juvenile; f: tail of third-stage male juvenile showing spicular primordium; g: tail of third-stage female juvenile; h: fourth-stage male juvenile; i: fourth-stage female juvenile; j: adult male gonad; k, l: adult female genital branch. Scale bar = 10 µm.
Figure 1 in A comparative account of the embryonic lineage and gonad development in two species of Rhabditidae (Nematoda)
Figure 1. Early embryonic cell lineages in Mesorhabditis paucipapillata and Cephaloboides anisospiculus as compared to Caenorhabditis elegans.
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