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| Ortíz-Ordoñez,Esperanza; Mendoza-Santana,Elizabeth L; Belmar-Pérez,Jorge; Padilla-Benavides,Teresita del Niño Jesús. |
| Some of the gastropods of the Baja California peninsula are of commercial value, but the majority are not. Among the less commercially valuable species are members of the genus Tegula, which are ecologically important because of their abundance and the trophic level they occupy. Mature specimens of T. eiseni, T. funebralis, T. aureotincta, T. gallina, and T. regina were collected from two rocky reefs close to Bahía Tortugas, B.C.S. and were processed using a paraffin-embedding technique. All of these species are dioecious, without external sexual dimorphism; in adults, the female gonads are green moss colored while male gonads are cream colored. The gonadal tissue is limited externally by a single ciliated cylindrical epithelium with plentiful granular... |
| Tipo: Journal article |
Palavras-chave: Gonadic histology; Baja California; Tegula. |
| Ano: 2009 |
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-95022009000300011 |
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| Vélez-Arellano,Nurenskaya; Shibayama,Mineko; Ortíz-Ordoñez,Esperanza; Silva-Olivares,Angélica; Arellano-Martínez,Marcial; García-Domínguez,Federico. |
| This paper describes the oogenesis of Chiton virgulatus, based on histological observations under transmission and scanning electron microscopy. Three oocyte types were identified: i) previtellogenic oocytes with a mean diameter of 50±20.5 µm, surrounded by elongated follicular cells of approximately 5 µm, ii) immature vitellogenic oocytes with a mean diameter of 113±15.3 µm and small cytoplasmic projections denoting the onset of the oocyte hull development; adjacent to each projection are pores approximately 0.7 µm in diameter, and iii) mature vitellogenic oocytes with a mean diameter of 146±24.8 µm; the oocyte cytoplasmic projections grow and its apical zone becomes trident-shaped; follicular cells adopt a bulbous shape due to the growth of the... |
| Tipo: Journal article |
Palavras-chave: Egg hull; Vitellogenesis; Ultrastructure. |
| Ano: 2014 |
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-95022014000200038 |
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