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Ultrastructure of sperms in Acoela (Acoelomorpha) and its concordance with molecular systematics
Characters of sperm morphology generally support the molecular hypothesis of relationships and confirm a suspected polyphyly of the families Convolutidae, Otocelididae, and Actinoposthiidae.
MATING BEHAVIOUR AND COPULATORY MECHANICS IN SIX SPECIES OF PLANORBIDAE (GASTROPODA: PULMONATA)
It is argued that Planorbidae show a relationship between gender expression (functional protandry vs simultaneous hermaphroditism) and mating behaviour (unilateral vs reciprocal mating) and the taxonomic utility of the copulatory behaviour and penial musculature is discussed.
ARCHITECTURE OF HAPTORAL MUSCULATURE IN THREE SPECIES OF LIGOPHORUS (MONOGENEA, ANCYROCEPHALIDAE)
This study used phalloidin staining in conjunction with confocal microscopy to examine haptoral musculature in three species of Ligophorus and compared with that of other ancyrocephalids.
Muscle architecture during the course of development of Diplostomum pseudospathaceum Niewiadomska, 1984 (Trematoda, Diplostomidae) from cercariae to metacercariae
The most profound changes, involving extensive remodelling and replacement of cercarial muscles, were seen in the body-wall musculature and in the anterior organ as it developed into the oral sucker.
The characteristics of copulation in Segmentina oelandica (Westerlund, 1885) (Gastropoda: Pulmonata: Planorbidae)
The copulation is shown to be a complex process determined by a specific set of morphological, physiological, behavioural and ecological characteristics.
Musculature of the penial complex: A new criterion in unravelling the phylogeny of Hygrophila (Gastropoda: Pulmonata)
The muscle arrangement in the penial complex of most major groups of freshwater pulmonates is examined to explore to which extent the copulatory musculature can serve as a source of phylogenetic information for Hygrophila.
Sperm packaging in the seminal vesicles of Hygrophila (Gastropoda: Pulmonata)
The use of chemically unprocessed, rather than fixative-treated, material shows that the spermatozoa of Hygrophila found in the seminal vesicles are arranged in a compacted fashion implying that they undergo complex folding and unfolding processes on the way toward and from these organs.
Sperm ultrastructure in two species of Gyraulus (Gastropoda: Pulmonata: Planorbidae)
The spermatozoa of the two Gyraulus species are compared with those of other Hygrophila and the possible importance of sperm morphology for the taxonomic status of G. (A.) crista is discussed.
Sperm ultrastructure in Acroloxus lacustris (Linnaeus, 1758) (Gastropoda: Panpulmonata)
Sperm ultrastructure in Culmenella rezvoji (Lindholm, 1929) (Gastropoda: Hygrophila)
- E. Soldatenko, A. B. Shatrov, A. Petrov, T. Sitnikova
- BiologyRuthenica, Russian Malacological Journal
- 17 June 2019
The spermatozoa of Culmenella have distinctive characters (three glycogen helices and high-profile surface ridge in the apical portion of the midpiece) that should be potentially useful in resolving the taxonomic position of this genus.