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Abstract:

Tomeurus gracilis is a species long considered pivotal in understanding the evolution of livebearing in atherinomorph fishes. Tomeurus gracilis is a zygoparous or embryoparous poeciliid: internal fertilization is followed by females laying fertilized eggs singly or retaining fertilized eggs until or near hatching. Tomeurus was hypothesized as the sister group of the viviparous poeciliids until it was proposed as a close relative of a derived viviparous poeciliid, Cnesterodon, hence nested among viviparous taxa rather than near the root of the tree. Here, we describe and compare reproductive morphological characters of the little-known Tomeurus with those of representative atherinomorphs. In Tomeurus and Cnesterodon, sperm are packaged in naked sperm bundles, or spermatozeugmata, in a configuration considered here diagnostic of viviparous poeciliids. Testes are single and free sperm are stored in the ovary in both taxa in contrast to oviparous atherinomorphs in which testes are paired and sperm are not packaged and not stored in the ovary. Efferent ducts in Cnesterodon testes and other viviparous poeciliids have a PAS-positive secretion demonstrating presence of a glycoprotein that inactivates sperm or prevents final sperm maturation. No PAS-positive staining secretion was observed in Tomeurus or oviparous atherinomorphs. Tomeurus shares apomorphic reproductive characters, such as sperm bundle and testis morphology and a gonopodium, with viviparous poeciliids and plesiomorphic characters, such as a thick zona pellucida with filaments, with oviparous taxa. We do not postulate loss or reversal of viviparity in Tomeurus, and we corroborate its phylogenetic position as sister to the viviparous poeciliids. © 2010 Wiley-Liss, Inc.

Registro:

Documento: Artículo
Título:Reproductive histology of Tomeurus gracilis Eigenmann, 1909 (Teleostei: Atherinomorpha: Poeciliidae) with comments on evolution of viviparity in atherinomorph fishes
Autor:Parenti, L.R.; Lonostro, F.L.; Grier, H.J.
Filiación:Division of Fishes, National Museum of Natural History, Smithsonian Institution, Washington, DC 20013-7012, United States
Lab. de Embriología Animal, Depto. de Biodiversidad y Biología Experimental, Facultad de Ciencias Exactas y Naturales, Universidad de Buenos Aires C1428EHA and CONICET, Rivadavia 1917 C1033AAJ, Ciudad Autónoma de Buenos Aires, Argentina
Fish and Wildlife Research Institute, St. Petersburg, FL 33701-5095, United States
Palabras clave:Egg morphology; Embryoparity/zygoparity; Spermatozeugma; Testis types; Zona pellucida; animal; article; cytology; evolution; female; fish; histology; male; oocyte; ovary; physiology; reproduction; spermatozoon; testis; ultrastructure; viviparity; Animals; Biological Evolution; Female; Fishes; Male; Ovary; Ovum; Reproduction; Spermatozoa; Testis; Viviparity, Nonmammalian
Año:2010
Volumen:271
Número:11
Página de inicio:1399
Página de fin:1406
DOI: http://dx.doi.org/10.1002/jmor.10886
Título revista:Journal of Morphology
Título revista abreviado:J. Morphol.
ISSN:03622525
CODEN:JOMOA
Registro:https://bibliotecadigital.exactas.uba.ar/collection/paper/document/paper_03622525_v271_n11_p1399_Parenti

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Citas:

---------- APA ----------
Parenti, L.R., Lonostro, F.L. & Grier, H.J. (2010) . Reproductive histology of Tomeurus gracilis Eigenmann, 1909 (Teleostei: Atherinomorpha: Poeciliidae) with comments on evolution of viviparity in atherinomorph fishes. Journal of Morphology, 271(11), 1399-1406.
http://dx.doi.org/10.1002/jmor.10886
---------- CHICAGO ----------
Parenti, L.R., Lonostro, F.L., Grier, H.J. "Reproductive histology of Tomeurus gracilis Eigenmann, 1909 (Teleostei: Atherinomorpha: Poeciliidae) with comments on evolution of viviparity in atherinomorph fishes" . Journal of Morphology 271, no. 11 (2010) : 1399-1406.
http://dx.doi.org/10.1002/jmor.10886
---------- MLA ----------
Parenti, L.R., Lonostro, F.L., Grier, H.J. "Reproductive histology of Tomeurus gracilis Eigenmann, 1909 (Teleostei: Atherinomorpha: Poeciliidae) with comments on evolution of viviparity in atherinomorph fishes" . Journal of Morphology, vol. 271, no. 11, 2010, pp. 1399-1406.
http://dx.doi.org/10.1002/jmor.10886
---------- VANCOUVER ----------
Parenti, L.R., Lonostro, F.L., Grier, H.J. Reproductive histology of Tomeurus gracilis Eigenmann, 1909 (Teleostei: Atherinomorpha: Poeciliidae) with comments on evolution of viviparity in atherinomorph fishes. J. Morphol. 2010;271(11):1399-1406.
http://dx.doi.org/10.1002/jmor.10886