Spermatogenesis and Spermatozoa in Stygocapitella subterranea (Annelida, Parergodrilidae), an Enigmatic Supralittoral Polychaete

@article{Purschke2005SpermatogenesisAS,
  title={Spermatogenesis and Spermatozoa in Stygocapitella subterranea (Annelida, Parergodrilidae), an Enigmatic Supralittoral Polychaete},
  author={G. Purschke and Mary C. Fursman},
  journal={Zoomorphology},
  year={2005},
  volume={124},
  pages={137-148}
}
The intertidal polychaete species Stygocapitella subterranea (Parergodrilidae) is characterised by extraordinary biology and morphology, resembling those of clitellates and Hrabeiella periglandulata, a terrestrial species of Annelida. An ultrastructural study of the spermatogenesis and spermatozoa was undertaken to elucidate whether these similarities might exhibit adaptive characters typical of annelids with highly derived reproductive modes. A second goal was to find out whether there are… Expand

Figures from this paper

Male genital organs in the eulittoral meiofaunal polychaete Stygocapitella subterranea (Annelida, Parergodrilidae): ultrastructure, functional and phylogenetic significance
TLDR
The observations confirm that consistencies with either clitellates or H. periglandulata are the result of convergent evolutionary events and the relationship of Parergodrilidae to an orbiniid/questid clade receives support from the present data. Expand
Ultrastructure developments during spermiogenesis in Polydora ciliata (Annelida: Spionidae), a parasite of mollusca
TLDR
The relationship of sperm ultrastructure to spermiogenesis in spionidae species was discussed and the formation of proacrosomal granules within the Golgi apparatus was discussed. Expand
Ultrastructural investigation and in vitro recapitulation of spermatid differentiation in a potential bio-indicator species – The marine invertebrate Galeolaria gemineoa (Polychaeta: Serpulidae)
TLDR
The concept that spermatid differentiation in this species is dependent on intrinsic developmental programming and does not require input from accompanying nurse cells is supported. Expand
Phylogeny of basal descendants of cocoon-forming annelids (Clitellata)
TLDR
Worms with ring-like clitella surrounding the body almost completely are herein renamed Euclitellata, and Oligochaeta is established as a valid clade for the hermaphroditic annelids bearing few or no chaetae. Expand
Ovaries of the white worm (Enchytraeus albidus, Annelida, Clitellata) are composed of 16-celled meroistic germ-line cysts.
TLDR
The paired ovaries of E. albidus are like a bunch of grapes and are composed of clearly separated units, syncytial germ cysts (clusters), which are surrounded by a thin layer of somatic cells, which indicates that these cells are not highly-specialised. Expand
Detailed analysis of the male reproductive system in a potential bio-indicator species – The marine invertebrate Galeolaria caespitosa (Polychaeta: Serpulidae)
TLDR
The independence of spermatogenic cells from supporting cells in G. caespitosa raised the possibility of inducing spermiogenesis in vitro, which would provide a useful tool to dissect the mechanisms underlying this complex cell differentiation process in invertebrates and other higher order animals. Expand
Delimitation of cryptic species drastically reduces the geographical ranges of marine interstitial ghost-worms (Stygocapitella; Annelida, Sedentaria).
TLDR
It is suggested that neither traditional diagnostic features nor quantitative morphology suffice to recognise species boundaries in cryptic species complexes, such as the Stygocapitella species complex, and that the recognition and description of cryptic species is of seminal importance for biodiversity assessments, biogeography and evolutionary biology. Expand

References

SHOWING 1-10 OF 41 REFERENCES
Male genital organs, spermatogenesis and spermatozoa in the enigmatic terrestrial polychaete Parergodrilus heideri (Annelida, Parergodrilidae)
TLDR
The specific characters observed in P. heideri are typical of species with direct transfer of sperm and internal fertilisation; there are no synapomorphies with either the Clitellata or H. periglandulata; the similarities between these terrestrial Annelida are very likely due to a corresponding reproductive biology in similar habitats and thus do not reflect a common ancestor. Expand
Vergleichende Ultrastrukturuntersuchungen der Eu- und Paraspermien von 13Protodrilus-Arten (Polychaeta, Annelida) und ihre taxonomische und phylogenetische Bedeutung
TLDR
The morphology of the slender, filiform spermatozoa of 13Protodrilus species of 22 different populations is investigated by light and transmission electron microscopy and elucidates possible plesiomorphous and apomorphous sperm traits. Expand
The ultrastructure of the spermatozoon of the oligochaetoid polychaete Questa sp. (Questidae, Annelida) and its phylogenetic significance
TLDR
Elongation of the primary vesicle and of the mitochondrial derivatives, and presence of an extensive axial rod, are seen in sperm of protodrilid archiannelids with which questids have somatic similarities indicative of a relationship closer than with other annelids. Expand
Ultrastructure of the spermatozoa of Parenterodrilus taenioides (Protodrilida: “Polychaeta”) and its phylogenetic significance
TLDR
An ultrastructural study revealed that the similar structure of sperm suggests that sperm transfer and fertilization are very probably the same in P. taenioides as in Protodrilus. Expand
Spermiogenesis and seminal receptacles in Aeolosoma singulare (Annelida, Polychaeta, Aeolosomatidae)
TLDR
Spermatogenesis, spermatozoa, seminal receptacles and the transformations of sperm after mating were examined for the first time in the polychaete annelid Aeolosoma singulare from Lake Baikal and revealed a progressive reduction of the cytoplasmic droplet. Expand
Spermiogenesis and Modified Sperm Morphology in the “Seepworm” Methanoaricia dendrobranchiata (Polychaeta: Orbiniidae) From a Methane Seep Environment in the Gulf of Mexico: Implications for Fertilization Biology
TLDR
It is hypothesize that the unusual spermatozoon morphology in this species has evolved due to the hypoxic environment in which the adults live and that fertilization biology is likely modified in some way to minimize sperm exposure to high levels of hydrogen sulfide. Expand
Spermatogenesis and sperm ultrastructure in the interstitial syllid Petitia amphophthalma (Annelida, Polychaeta)
TLDR
The mature spermatozoa accumulate in the dorsal region of a seminal vesicle that extends over several segments and form a cytophore after the second maturation division, which leads to spermatogenesis in both primary and secondary sperMatocytes. Expand
Sperm ultrastructure and spermatogenesis in the interstitial polychaete Sphaerosyllis hermaphrodita (Syllidae: Exogoninae)
TLDR
The mature spermatozoa of Sphaerosyllis hermaphrodita (Polychaeta: Syllidae) were reconstructed from electron micrographs, identifying them as belonging to the modified sperm type often found in interstitial polychaetes. Expand
Ultrastructural investigations on the spermatozoon and its genesis in Aeolosoma litorale with considerations on the phylogenetic implications for the aeolosomatidae (annelida)
TLDR
The absence of synapomorphies with the spermatozoa of the clitellate species corroborates the view that the Aeolosomatidae are not closely related to these taxa. Expand
An ultrastructural investigation of Hrabeiella Pizl & Chalupský, 1984 (Annelida). II. The spermatozoon.
TLDR
None of the spermatozoal autapomorphies of the Euclitellata is shared by Hrabeiella, and none of the observed similarities to the sperm (introsperm) of questids, protodrilids or other polychaetes seems to represent an immediate synapomorphy. Expand
...
1
2
3
4
5
...