Diferenciación sexual en la langosta de agua dulce Cherax quadricarinatus (Decapoda: Parastacidae)
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| Format: | Artículo científico |
| Sprache: | en |
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Universidad de Costa Rica
2007
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| _version_ | 1876424768027099136 |
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| author | Fernanda J. Vazquez |
| author_facet | Fernanda J. Vazquez |
| contents | Diferenciación sexual en la langosta de agua dulce Cherax quadricarinatus (Decapoda: Parastacidae) Fernanda J. Vazquez Laura S. López Greco Biología gonad red patch appendix masculina Cherax quadricarinatus sexual differentiation Sexual differentiation in the freshwater crayfish Cherax quadricarinatus (Decapoda:Parastacidae). We determined the earliest stage of postembryonic development at which primary and secondarysexual differentiations occur in the freshwater (red claw) crayfish Cherax quadricarinatus. For this purpose,797 males, 506 females and 456 intersex specimens within a weight range of 0.02-89.96 g were observed understereoscopic microscope to determine the presence of the genital openings at the basis of the third (females) orfifth (males) pair of pereiopods. Animals presenting both pairs of genital openings were considered as intersex.A subsample of 106 males, 69 females and 59 intersex were dissected for the macroscopic characterization ofgonad morphology. The development of the genital openings began approximately at 0.10 g, simultaneouslywith the differentiation of the reproductive system in females, males and intersex. Although the differentiationof the reproductive system started very early in the postembryonic development, the definitive form and colourof ovaries, oviducts, testes and vasa deferentia was acquired later. The differentiation of the appendix masculinabegan at 0.12-0.2 g and acquired the elongated shape of the adult at 1-2 g. The soft red patch characteristic ofadult males started at 2.3 g of body weight in both chelipeds. Rev. Biol. Trop. 55 (Suppl. 1): 33-38. Epub 2007June, 29. 2007 artículo científico 0034-7744 https://www.redalyc.org/articulo.oa?id=44909907 https://www.redalyc.org/journal/449/44909907/ https://www.redalyc.org/journal/449/44909907/html/ https://www.redalyc.org/journal/449/44909907/44909907.epub https://www.redalyc.org/journal/449/44909907/movil en http://www.redalyc.org/revista.oa?id=449 Revista de Biología Tropical application/pdf Universidad de Costa Rica Revista de Biología Tropical (Costa Rica) Num.1 Vol.55 |
| format | Artículo científico |
| id | redalyc_44909907 |
| institution | Redalyc |
| language | en |
| publishDate | 2007 |
| publisher | Universidad de Costa Rica |
| spellingShingle | Diferenciación sexual en la langosta de agua dulce Cherax quadricarinatus (Decapoda: Parastacidae) Fernanda J. Vazquez Biología gonad red patch appendix masculina Cherax quadricarinatus sexual differentiation Diferenciación sexual en la langosta de agua dulce Cherax quadricarinatus (Decapoda: Parastacidae) Fernanda J. Vazquez Laura S. López Greco Biología gonad red patch appendix masculina Cherax quadricarinatus sexual differentiation Sexual differentiation in the freshwater crayfish Cherax quadricarinatus (Decapoda:Parastacidae). We determined the earliest stage of postembryonic development at which primary and secondarysexual differentiations occur in the freshwater (red claw) crayfish Cherax quadricarinatus. For this purpose,797 males, 506 females and 456 intersex specimens within a weight range of 0.02-89.96 g were observed understereoscopic microscope to determine the presence of the genital openings at the basis of the third (females) orfifth (males) pair of pereiopods. Animals presenting both pairs of genital openings were considered as intersex.A subsample of 106 males, 69 females and 59 intersex were dissected for the macroscopic characterization ofgonad morphology. The development of the genital openings began approximately at 0.10 g, simultaneouslywith the differentiation of the reproductive system in females, males and intersex. Although the differentiationof the reproductive system started very early in the postembryonic development, the definitive form and colourof ovaries, oviducts, testes and vasa deferentia was acquired later. The differentiation of the appendix masculinabegan at 0.12-0.2 g and acquired the elongated shape of the adult at 1-2 g. The soft red patch characteristic ofadult males started at 2.3 g of body weight in both chelipeds. Rev. Biol. Trop. 55 (Suppl. 1): 33-38. Epub 2007June, 29. 2007 artículo científico 0034-7744 https://www.redalyc.org/articulo.oa?id=44909907 https://www.redalyc.org/journal/449/44909907/ https://www.redalyc.org/journal/449/44909907/html/ https://www.redalyc.org/journal/449/44909907/44909907.epub https://www.redalyc.org/journal/449/44909907/movil en http://www.redalyc.org/revista.oa?id=449 Revista de Biología Tropical application/pdf Universidad de Costa Rica Revista de Biología Tropical (Costa Rica) Num.1 Vol.55 |
| title | Diferenciación sexual en la langosta de agua dulce Cherax quadricarinatus (Decapoda: Parastacidae) |
| topic | Biología gonad red patch appendix masculina Cherax quadricarinatus sexual differentiation |
| url | https://www.redalyc.org/articulo.oa?id=44909907 https://www.redalyc.org/journal/449/44909907/ https://www.redalyc.org/journal/449/44909907/html/ https://www.redalyc.org/journal/449/44909907/44909907.epub https://www.redalyc.org/journal/449/44909907/movil |