An ultrastructural study of the spermatozoa ofEulalia sp. (Phyllodocidae),Lepidonotus sp. (Polynoidae),Lumbrineris sp. (Lumbrineridae) andOwenia fusiformis (Oweniidae)

Rouse, Greg W.

doi:10.1007/bf02364204

Cited by 17 publications

(9 citation statements)

References 17 publications

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“…Sperm of both Lucky Strike polynoid species have elongate heads (50 pm), a morphology that is suggestive of specialized transfer. In comparison, mature spermatozoa of several polyno~d species (Lepidonotus sp., Harmothoe imbricata, H. irnpar) and other polychaete species with external fertilization have head lengths on the order of 2.7 to 3.6 pm (Rouse 1988, Bentley & Serries 1992. Sperm with elongate heads are in general associated with species that exhibit a modified method of sperm transfer or storage, in contrast to ectaquasperm (sensu Rouse & Jamieson 1987) which are most often shed freely into the water (Rice 1992).…”

Section: Oogenesismentioning

confidence: 99%

Reproductive biology of free-living and commensal polynoid polychaetes at the Lucky Strike hydrothermal vent field (Mid-Atlantic Ridge)

Dover¹,

Trask²,

Gross³

et al. 1999

Mar. Ecol. Prog. Ser.

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ABSTRACT. We examined the reproductive biology of a polynoid polychaete commensal in mussel mantle cavities (Branchipolynoe cf. seepensis) and of a polynoid polychaete that is free-living among those same mussels (Opisthotrochopodus n. sp.). Specimens of each species were collected from 2 different sites (Eiffel Tower and Sintra; -400 m apart) within the Lucky Strike hydrothermal field. Both species exhibit sexual dimorphism, with varying numbers of pairs of nephridial papillae. In B. cf. seepensis, sexual &morphism also includes a difference in size, with females larger than males. Contrary to our expectations, the reproductive biology of both species is very similar. Sperm heads are elongate, suggesting some mode of sperm transfer or storage. Females of both species contain mature sperm and there is evidence of internal fertilization. Maximum oocyte diameters are large (>390 pm), from which we infer non-planktotrophic development; oogenesis is intraovarian and suggests rapid oocyte development. Oocyte size-frequency distributions and population size structure suggest a pattern of asynchronous gametogenesis. We found no substantive evidence for site-specific variations in reproductive biology in either species.

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Section: Oogenesismentioning

confidence: 99%

Reproductive biology of free-living and commensal polynoid polychaetes at the Lucky Strike hydrothermal vent field (Mid-Atlantic Ridge)

Dover¹,

Trask²,

Gross³

et al. 1999

Mar. Ecol. Prog. Ser.

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“…The ultrastructure of Xenoturbella spermatozoa is similar to that of bivalves (Dong et al. 2005), polychaetes (Rouse 1988), enteropneust hemichordates (Benito and Pardos 1997; Jamieson 2000a; Franzén 2001), priapulid worms (Storch et al. 2000), and sipunculans (Rice 1993).…”

Section: Discussionmentioning

confidence: 86%

Spermatozoon ultrastructure of Xenoturbella bocki (Westblad 1949)

et al. 2011

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Obst, M., Nakano, H., Bourlat, S.J., Thorndyke, M.C., Telford, M.J., Nyengaard, J.R. and Funch, P. 2011. Spermatozoon ultrastructure of Xenoturbella bocki (Westblad 1949). -Acta Zoologica (Stockholm) 92: 109-115.Here, we report on the sperm ultrastructure of Xenoturbella bocki (Westblad 1949), which we studied for the first time in detail using light, scanning and transmission electron microscopy. The mature spermatozoa are of the bilaterian primitive type, also called aquasperm and develop as uniflagellate sperm consisting of a round head with distinct mitochondria at the base and a 9+2 flagellum of approximately 42 lm in length. The acrosomal complex consists of a small, round electron translucent acrosomal vesicle and a subacrosomal base. There is no separate midpiece, and the mitochondria surround the proximal and distal centriole in the posterior part of the head. The primitive structure of the spermatozoa suggests that these fertilize the egg by free spawning, probably the ancestral mode of fertilization in early bilaterians. When compared to the spermatozoa of other metazoans, we find that the arrangement of organelles in the Xenoturbella sperm shows similarities to a wide range of protostome and deuterostome taxa and does not seem to indicate any particular phylogenetic relationship.

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“…On the other hand, the spermatozoon of Lumbrineris sp. from Grappler Inlet, Vancouver Island (Leander et al 2003), compared with those of the species so far studied (Rouse 1988;Messina et al 2005), differs greatly in external morphology, in size of the nucleus, which is rather elongated, and in number and shape of mitochondria. These findings highlight the considerable variability of form and structure of sperm in similar polychaetes species which inhabit distant seas and oceans, as noted also by our previous studies (Conti et al 2005).…”

Section: Discussionmentioning

confidence: 86%

“…The structure of the spermatozoon of L. impatiens strictly recalls that of the male cell of the Lumbrineris sp. collected in New South Wales, Australia, the only one of the genus so far examined (Rouse 1988). On the other hand, the spermatozoon of Lumbrineris sp.…”

Section: Discussionmentioning

confidence: 99%

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The spermatozoon ofLumbrineris (Scoletoma) impatiens(Claparède, 1868) (Polychaeta, Lumbrineridae)

Conti

Loy

Diana

et al. 2011

Italian Journal of Zoology

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The sperm morphology of the polychaete Lumbrineris (Scoletoma) impatiens (Claparède, 1868) (Polychaeta, Lumbrineridae) of a sub-tidal population from the Gulf of Naples was studied both by transmission electron microscopy (TEM) and highresolution scanning electron microscopy (HRSEM). In particular, the ultrastructural characteristics of mature male cells, the shape and structure of the acrosome, the nucleus and the flagellum were investigated by TEM. HRSEM images show the sperm external morphology and allow to classify the male gamete as an ect-aquasperm, by having a short head, four to five rounded mitochondria and a long tail, and generally associated with free-spawning. The structure of the spermatozoon of L. impatiens strictly recalls that of the male cell of the Lumbrineris sp. collected in New South Wales, Australia, the only one of the genus so far examined. On the other hand, by comparing these findings with those obtained on the external morphology of male gametes of the Lumbrineris sp. from Grappler Inlet, Vancouver Island, it emerges once again that significant variations are present. This confirms the extraordinary variability of polychaetes' reproductive characters even at genus level.

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An ultrastructural study of the spermatozoa ofEulalia sp. (Phyllodocidae),Lepidonotus sp. (Polynoidae),Lumbrineris sp. (Lumbrineridae) andOwenia fusiformis (Oweniidae)

Cited by 17 publications

References 17 publications

Reproductive biology of free-living and commensal polynoid polychaetes at the Lucky Strike hydrothermal vent field (Mid-Atlantic Ridge)

Reproductive biology of free-living and commensal polynoid polychaetes at the Lucky Strike hydrothermal vent field (Mid-Atlantic Ridge)

Spermatozoon ultrastructure of Xenoturbella bocki (Westblad 1949)

The spermatozoon ofLumbrineris (Scoletoma) impatiens(Claparède, 1868) (Polychaeta, Lumbrineridae)

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