The Pacific clam Nutricola tantilla (Bivalvia:Veneridae) has separate sexes and makes use of brood protection and sperm storage

Jørgen Lützen; Åse Jespersen; Michael P.  Russell

doi:10.1093/mollus/eyv015

The Pacific clam Nutricola tantilla (Bivalvia:Veneridae) has separate sexes and makes use of brood protection and sperm storage

Bidragets oversatte titel: Den Pacifiske musling Nutricola tantilla (Bivalvia: Veneridae) er særkønnet og benytter sig af yngelpleje og opbevaring af spermier: Særkønnethed hos Nutricola

Jørgen Lützen, Åse Jespersen, Michael P. Russell

Marine Biological Section

5 Citationer (Scopus)

Abstract

Et morfologisk studie af en NW Amerikansk blødbunds-musling Nutricola tantilla viste at den er særkønnet og ikke, som tidligere rapporteret, protandrisk hermafrodit. Vi baserer denne konklusion på at små hanner har højt specialiserede kirtelholdige spermiodukter, mens større hunner har simple ovidukter og ingen overgangsstadier mellem de to gange eksisterer. Hunnerne har yngelpleje og opbevarer deres æg i et rugekammer dannet af den dorsale del af den indre halvgælle. Spermatozoer blev fundet associeret med et netværk af væv af ukendt oprindelse mellem æg eller tidlige fosterstadier. Vi antager at spermie celler udspringer fra denne pool og befrugter oocyterne når disse ovuleres. Måden af opbevare spermatozoerne i N. tantilla er speciel på den måde at de sansynligvis ernæres af ikke-epithelielle celler. Vi beskriver ultrastrukturen af spermierne. Store, kugleformede cytophorer associeret med spermatozoernes akrosomer, representerer muligvis forstadier til tidligere beskrevne spermatozeugmer.

Bidragets oversatte titel	Den Pacifiske musling Nutricola tantilla (Bivalvia: Veneridae) er særkønnet og benytter sig af yngelpleje og opbevaring af spermier: Særkønnethed hos Nutricola
Originalsprog	Engelsk
Tidsskrift	Journal of Molluscan Studies
Vol/bind	81
Udgave nummer	3
Sider (fra-til)	397-406
Antal sider	10
ISSN	0260-1230
DOI	https://doi.org/10.1093/mollus/eyv015
Status	Udgivet - 15 okt. 2014

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10.1093/mollus/eyv015

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https://academic.oup.com/mollus/article-pdf/81/3/397/5188114/eyv015.pdf

Citationsformater

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title = "The Pacific clam Nutricola tantilla (Bivalvia:Veneridae) has separate sexes and makes use of brood protection and sperm storage",

abstract = "A morphological study revealed that the NW American soft-bottom bivalve Nutricola tantilla is dioecious, not a protandric hermaphrodite as previously reported. We base this conclusion on the smaller males having highly specialized, glandular sperm ducts, while the larger females have simple oviducts and no transition between the two ducts occurs. The females are brooders and retain their ova in a marsupium within the dorsal part of the inner demibranchs. Sperm cells were present and associated with a mesh-like tissue among the ova or early-stage embryos. How this tissue originates is still unknown. We suggest that sperm cells dissociate from this pool and fertilize the oocytes as soon as they are ovulated. The mode of sperm storage in N. tantilla represents a unique case in that the sperm are presumably nurtured within a nonepithelial tissue. We describe the ultrastructure of the sperm cells in N. tantilla. Large, spherical cytophores become associated with a multitude of acrosomes of spermatozoa and probably represent the precursors of the spermatozeugmata that have been described previously.",

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T1 - The Pacific clam Nutricola tantilla (Bivalvia:Veneridae) has separate sexes and makes use of brood protection and sperm storage

AU - Lützen, Jørgen

AU - Jespersen, Åse

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N2 - A morphological study revealed that the NW American soft-bottom bivalve Nutricola tantilla is dioecious, not a protandric hermaphrodite as previously reported. We base this conclusion on the smaller males having highly specialized, glandular sperm ducts, while the larger females have simple oviducts and no transition between the two ducts occurs. The females are brooders and retain their ova in a marsupium within the dorsal part of the inner demibranchs. Sperm cells were present and associated with a mesh-like tissue among the ova or early-stage embryos. How this tissue originates is still unknown. We suggest that sperm cells dissociate from this pool and fertilize the oocytes as soon as they are ovulated. The mode of sperm storage in N. tantilla represents a unique case in that the sperm are presumably nurtured within a nonepithelial tissue. We describe the ultrastructure of the sperm cells in N. tantilla. Large, spherical cytophores become associated with a multitude of acrosomes of spermatozoa and probably represent the precursors of the spermatozeugmata that have been described previously.

AB - A morphological study revealed that the NW American soft-bottom bivalve Nutricola tantilla is dioecious, not a protandric hermaphrodite as previously reported. We base this conclusion on the smaller males having highly specialized, glandular sperm ducts, while the larger females have simple oviducts and no transition between the two ducts occurs. The females are brooders and retain their ova in a marsupium within the dorsal part of the inner demibranchs. Sperm cells were present and associated with a mesh-like tissue among the ova or early-stage embryos. How this tissue originates is still unknown. We suggest that sperm cells dissociate from this pool and fertilize the oocytes as soon as they are ovulated. The mode of sperm storage in N. tantilla represents a unique case in that the sperm are presumably nurtured within a nonepithelial tissue. We describe the ultrastructure of the sperm cells in N. tantilla. Large, spherical cytophores become associated with a multitude of acrosomes of spermatozoa and probably represent the precursors of the spermatozeugmata that have been described previously.

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The Pacific clam Nutricola tantilla (Bivalvia:Veneridae) has separate sexes and makes use of brood protection and sperm storage

Abstract

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