EIGHTEEN. Morphological Diversity of Decapod Spermatozoa

Felgenhauer, Bruce E.; Abele, Lawrence G.

doi:10.7312/baue90796-019

Cited by 41 publications

(44 citation statements)

References 0 publications

Supporting

Mentioning

Contrasting

Unclassified

Order By: Relevance

“…e Apart from mitochondria, the cytoplasm includes vesicular structures and other amorphous membrane remnants (arrowheads). Numerous chromatin nodules (arrows) are visible in the nuclear region prolongation of the acrosome vesicle that is termed spike (Felgenhauer and Abele 1991;Jamieson 1991;Krol et al 1992;Medina 1995a;Jamieson and Tudge 2000). However, an earlier study (Medina 1995b) revealed that two representatives of the Aristeidae have spike-less spermatozoa (Fig.…”

Section: Discussionmentioning

confidence: 94%

“…An acrosome-less sperm pattern resembling that of Aristaeopsis and Aristaeomorpha is also found in the dendrobranchiate sergestid Sergestes arcticus Krøyer, 1855 (Medina 1995a), two euphausiids, Euphausia sp. (Jamieson 1991) and Meganyctiphanes norvegica (Sars, 1857) (Medina et al 1998), and the pleocyemate stenopid Stenopus hispidus (Olivier, 1811) (Felgenhauer and Abele 1991). The loss of the acrosome is a repeated event that has occurred several times independently throughout evolution of the crustacean sperm (Jamieson 1991).…”

Section: Sperm Ultrastructure In Aristaeopsis and Aristaeomorphamentioning

confidence: 97%

“…The sperm ultrastructure has been successfully employed in studies on taxonomy and phylogeny in different animal taxa, including the Crustacea (Felgenhauer and Abele 1991;Jamieson 1991;Jamieson et al 1995a, b;Medina 1995a, b;Tudge 1995;Jamieson and Tudge 2000;Martin and Davis 2001). Although the sperm ultrastructure has been investigated in numerous species from the Pleocyemata, several groups of Dendrobranchiata still remain poorly studied.…”

Section: Introductionmentioning

confidence: 97%

See 2 more Smart Citations

Ultrastructure of the spermatozoa of Aristaeopsis edwardsiana and Aristeus varidens (Crustacea, Dendrobranchiata, Aristeidae)

et al. 2006

View full text Add to dashboard Cite

The acrosome-less spermatozoon of Aristaeopsis edwardsiana (Crustacea, Aristeidae), which consists of a central non-membrane bound nuclear region surrounded by a thin peripheral cytoplasm, much resembles that of the previously studied aristeid Aristaeomorpha foliacea. The marked spermatozoal similarities between these two species appear to indicate a close phylogenetic proximity. A considerably different spermatozoal pattern is observed in aristeids from the genus Aristeus (A. varidens and A. antennatus), whose spermatozoa possess an anterior spherical acrosome, lacking a spike, and partially embedded in (instead of capping) the main sperm body. The two distinct sperm types found in the Aristeidae differ significantly from the spiked sperm typically found in most penaeoids (Penaeidae, Solenoceridae and Sicyoniidae), thus suggesting a phylogenetic separation of the Aristeidae from the remaining Penaeoidea.

show abstract

Section: Discussionmentioning

confidence: 94%

Section: Sperm Ultrastructure In Aristaeopsis and Aristaeomorphamentioning

confidence: 97%

Section: Introductionmentioning

confidence: 97%

See 1 more Smart Citation

Ultrastructure of the spermatozoa of Aristaeopsis edwardsiana and Aristeus varidens (Crustacea, Dendrobranchiata, Aristeidae)

et al. 2006

View full text Add to dashboard Cite

show abstract

“…Furthermore, depending on the species, fertilization can be either internal or external (Mathews 1956;Berg and Sandifer 1984). Sperm within this order is non-motile and is deposited in spermatophores (Bauer 1986;Felgenhauer and Abele 1991), which in some species can be stored in spermathecae with females having the ability to store spermatophores through molts (Bauer 1986;Subramoniam 1993). In caridean shrimps spermatophores are deposited on the ventral side of the female.…”

Section: Introductionmentioning

confidence: 99%

High prevalence of multiple paternity in the deep-sea shrimp Acanthephyra pelagica

2016

View full text Add to dashboard Cite

“…In the C urrently, in animals that reproduce sexually, the encounter (fertilization) of eggs and sperm takes place either externally or internally. Regardless of the fertilization environment, eggs in general are relatively large nonmotile cells, whereas sperm are generally small motile cells, even though some exceptions can be seen; for example, many crustaceans produce nonmotile sperm without a fl agellum (Felgenhauer and Abele, 1991). Such functional differences of eggs and sperm are refl ected in their structure.…”

mentioning

confidence: 98%

Parasperm: morphological and functional studies on nonfertile sperm

Hayakawa

2007

Ichthyol Res

View full text Add to dashboard Cite

Sperm polymorphism, a phenomenon in which more than one type of sperm is produced within a species, occurs widely in animals from invertebrates to vertebrates. Sperm in this phenomenon can be categorized into fertile sperm and nonfertile sperm on the basis of fertilization ability. Nonfertile sperm can be further classifi ed into parasperm and aberrant deformed sperm. Parasperm are sperm produced through a constant developmental process along with normal fertile eusperm, and they are readily distinguished from deformed sperm, which are irregularly crippled by unpredictable errors at certain stages during spermatogenesis. Sperm identifi ed as parasperm occur widely in invertebrates but are presently quite limited in vertebrates. This may be the result of the defi ciency both of studies on parasperm and of clear criteria to identify parasperm in vertebrates. Some vertebrates show unique spermatogenesis, such as symplastic spermatid and semicystic spermatogenesis. Thus, parasperm must be identifi ed by comparing cells in each cyst and in semen, because irregularly shaped cells in the seminal duct could be either parasperm or normal spermatids. Although parasperm are identifi ed by clear criteria in vertebrates, only in cottoid fi shes to date, it is possible for parasperm to be discovered in other vertebrates. Recently, roles related to sperm competition have been reported in several species (e.g., the marine cottoid fi sh Hemilepidotus gilberti), and, with some of them, parasperm production is infl uenced by an intraspecifi c factor such as a sex ratio or the density of a population. Sperm competition is one of the important candidates for infl uencing evolution of parasperm functions, but not all parasperm seem to have a relation to sperm competition. Parasperm function may relate to the ecological conditions of each species that produces parasperm. Studies on parasperm function will be advanced by an ecological approach concerning male fertilization success as well as cytological investigation for parasperm.

show abstract

EIGHTEEN. Morphological Diversity of Decapod Spermatozoa

Cited by 41 publications

References 0 publications

Ultrastructure of the spermatozoa of Aristaeopsis edwardsiana and Aristeus varidens (Crustacea, Dendrobranchiata, Aristeidae)

Ultrastructure of the spermatozoa of Aristaeopsis edwardsiana and Aristeus varidens (Crustacea, Dendrobranchiata, Aristeidae)

High prevalence of multiple paternity in the deep-sea shrimp Acanthephyra pelagica

Parasperm: morphological and functional studies on nonfertile sperm

Contact Info

Product

Resources

About