TY - JOUR
AU1 - ALAN N. HODGSON, BRIAN MORTON
AB - The spermatozoa of Patelloida profunda albonotata, P. saccharina, P. pygmaea and Nipponacmaea schrenkii (Lottiidae) are described by transmission electron microscopy. All have ect-aquasperm, typical of invertebrates using external fertilization. The sperm of all four species have a cylindrical nucleus (length: breadth > 4: 1 in P. p. albonotata and P. saccharina ; <4: 1 in P. pygmaea and N. schrenkii ) which tapers towards the rounded anterior end. All have an acrosome with a posterior acrosomal lobe which extends into the centre of the subacrosomal space. In P. p. albonotata and P. saccharina the acrosomal contents are undifferentiated and the posterior lobe extends to the nucleus, being separated from it by flocculent material. In P. pygmaea the acrosomal contents are differentiated, the lobe is relatively short and the subacrosomal space is filled with material with a fibrous appearance. The acrosome of N. schrenkii is undifferentiated and the posterior lobe is no more than a bulge. The sperm of P. p. albonotata and N. sacchrina have a small (0.25 μm long) cytoplasmic collar which surrounds the axoneme anteriorly whereas in P. pygmaea and N. schrenkii the cytoplasmic collar is longer (1 μm) and is swollen by an electron-dense vesicle. The composition and function of this vesicle is unknown. The spermatozoa of Patelloida and Nipponacmaea have structural features which are similar to sperm of the Lottiidae providing some support for the placement of these genera in the Lottiidae as proposed by Lindberg & Hedegaard (1996) and Sasaki & Okutani (1993) respectively. The similarities of the sperm of P. pygmaea to N.schrenkii raise some doubts about the tax-onomic status of the former species. Spermiogenesis in all four species is similar to that described for other Acmaeoidea and Patelloidea. In P. pygmaea and N. schrenkii , however, in addition to the acrosomal vesicle, the Golgi body produces a number of electron-dense vesicles which fuse and eventually form a single vesicle in the collar of the mid-piece. © The Malacological Society of London « Previous | Next Article » Table of Contents This Article J. Mollus. Stud. (1998) 64 (1): 11-19. doi: 10.1093/mollus/64.1.11 » Abstract Free Full Text (PDF) Free Classifications Articles Services Article metrics Alert me when cited Alert me if corrected Find similar articles Similar articles in Web of Science Add to my archive Download citation Request Permissions Citing Articles Load citing article information Citing articles via CrossRef Citing articles via Scopus Citing articles via Web of Science Citing articles via Google Scholar Google Scholar Articles by HODGSON, A. N. Articles by MORTON, B. 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TI - SPERMOGENESIS AND SPERM STRUCTURE IN THREE SPECIES OF PATELLOIDA AND ONE SPECIES OF NIPPONACMAEA (PATELLOGASTROPODA: ACMAEOIDEA)
JF - Journal of Molluscan Studies
DO - 10.1093/mollus/64.1.11
DA - 1998-02-01
UR - https://www.deepdyve.com/lp/oxford-university-press/spermogenesis-and-sperm-structure-in-three-species-of-patelloida-and-kJMl0mBHOH
SP - 11
VL - 64
IS - 1
DP - DeepDyve
ER -