Aspectos ultraestruturais do espermatozóide de Natica marochiensish (Gmelin) (MOllusca, Gastropoda) do litoral norte do Brasil

Abstract

ABSTRACT. ULTRASTRUCTURAL ASPECTS OF T1IE SI' ERMATOZOON OFSpermatozoa of Nalica marochienssish (G l1lelin, 1791) is desc ribed by light and electron microscopy. The sperl1latozoon is ofthe pr imit ivc type wi th head co ntai ns a conical acrosomal complex w ith 3n acrosoma l vesicle of dellse l11alri x hav illg 3 basis occupied by the subacrosomal space. The l11iddle piece shows the centri o lar com plex sUlTounded by mitochondria and the tail contai ns the axoncme wi th a 9+2.

Spermatozoan morphology of the snails Babylonia lutosa , Babylonia areolata from parental lines of populations in Hainan and Thailand and hybrid lines

“…Modified‐type sperm are an adaptation to internal fertilization: the sperm head tends to be miniaturized and elongated to enhance motile ability; the presence of a mitochondrial sheath and a glycogen particle sheath results in a more stable source of energy (Jiao et al., 2004). The modified‐type sperm structures have been studied in several species of shellfish including Littorina sitkana (Caenogastropoda, Littorinimorpha (originally belonging to (Mesogastropoda)) (Buckland‐Nicks, 1973; Gofas, 2016), Natica marochiensish (Matos et al., 1997), B. formosae formosae (Neogastropoda, Muricoidae) (Ke & Li, 1992), Rapana venosa (Hou et al., 1990).…”