Differences in Microthrix Form Between Stomach and Spiral Intestine Stages of the Cestode, Trilocularia: Interspecific Variation or Development?

  title={Differences in Microthrix Form Between Stomach and Spiral Intestine Stages of the Cestode, Trilocularia: Interspecific Variation or Development?},
  author={Mary Pickering and Janine N. Caira},
  booktitle={The Journal of parasitology},
Abstract:  Tetraphyllidean cestodes of the genus Trilocularia have been reported from Squalus acanthias throughout this shark's global distribution, occupying both the stomach and spiral intestine. This study investigated whether variation seen in microthrix form among specimens within this host species is indicative of interspecific variation or is attributable to developmental transformation of a single cestode species. Sequence data for the 2 nuclear genes 28S rDNA (D1–D3) and ITS1, and the… 
Diversity, phylogenetic relationships and host associations of Calliobothrium and Symcallio (Cestoda : ‘Tetraphyllidea’) parasitising triakid sharks
Molecular phylogenetic analyses based on 28S rDNA data for four of the seven known species of Calliobothrium and five of the 11known species of Symcallio supported the mutual monophyly of the two genera, which is readily distinguished based on whether they exhibit proglottid laciniations, and supports subclades of Sym callio with and without hook accessory pieces.
The Dismantling of Calliobothrium (Cestoda: Tetraphyllidea) With Erection of Symcallio n. gen. and Description of Two New Species
This paper aims to resolve the dual composition of the triakid shark–hosted tetraphyllidean genus Calliobothrium—an issue that has been recognized for over a decade, and confirmed the reciprocal monophyly of the 2 clades, supporting establishment of a new genus.
Seasonal dynamics of the cestode fauna in spiny dogfish, Squalus acanthias (Squaliformes: Squalidae)
Following seasonal fluctuations in infection parameters of three cestode species parasitizing spiny dogfish in the northwest Atlantic and comparing them to work previously published from the northeast Atlantic, seasonal trends were found to be remarkably similar on both sides of the Atlantic.
Morphological variation in the hyperapolytic lecanicephalidean species Anteropora japonica (Yamaguti, 1934) (Eucestoda).
In November of 2013, a specimen of Japanese sleeper ray, Narke japonica (Temminck et Schlegel), caught off Nanfang-ao, Taiwan was found to be parasitised by the cestode Anteropora japonica (Yamaguti,
Surface ultrastructure and the mitochondrial gene rrnl of Parachristianella indonesiensis Palm, 2004 (Trypanorhyncha: Eutetrarhynchidae) with the amended generic diagnosis
The microthrix pattern of adult Parachristianella indonesiensis Palm, 2004 is described for the first time based on the standardized terminology for microtriches, and the generic diagnosis of
Monsters of the Sea Serpent: Parasites of an Oarfish, Regalecus russellii
Examination of a small portion of the viscera of an oarfish recovered from Santa Catalina Island, southern California, revealed numerous tetraphyllidean tapeworm plerocercoids, Clistobothrium cf.
Clistobothrium sp. (Cestoda: Tetraphyllidea) in oarfish (Regalecus russelii) stranded on the coast of Akita Prefecture, Japan
It was revealed that oarfish represent one of the intermediate hosts of the genus Clistobothrium, and large sharks are the definitive hosts for these parasites.
An enigmatic new tapeworm, Litobothrium aenigmaticum, sp. nov. (Platyhelminthes: Cestoda: Litobothriidea), from the pelagic thresher shark with comments on development of known Litobothrium species
Developmental data show typical litobothriideans bear basic elements of their adult scolex upon entering the definitive host, undermining the notion that the new cestode represents a distinct litobothsriidean life cycle stage, and justify establishment of Litobothrium aenigmaticum.


A new genus and two new species of Anteroporidae (Cestoda: Lecanicephalidea) from the darkspotted numbfish, Narcine maculata (Torpediniformes: Narcinidae), off Malaysian Borneo.
The cestode fauna of the darkspotted numbfish, Narcine maculata (Shaw) (Torpediniformes: Narcinidae), from Malaysian Bomrneo was examined for the first time. This work resulted in the discovery of a
New Species of Crossobothrium (Cestoda: Tetraphyllidea) from the Broadnose Sevengill Shark, Notorynchus cepedianus, in Argentina
  • V. Ivanov
  • Biology
    The Journal of parasitology
  • 2009
Abstract Two new species of Crossobothrium were found inhabiting Notorynchus cepedianus, the broadnose sevengill shark, collected from the coast of Buenos Aires Province, Argentina. Crossobothrium
A new hyperapolytic species, Trilocularia eberti sp. n. (Cestoda: Tetraphyllidea), from Squalus cf. mitsukurii (Squaliformes: Squalidae) off South Africa with comments on its development and fecundity.
A new species of tetraphyllidean cestode in the genus Trilocularia is described from an undescribed shark species, Squalus cf. mitsukurii, off the coast of South Africa. Trilocularia eberti sp. n. is
Morphological investigations into Floriceps minacanthus (Trypanorhyncha: Lacistorhynchidae) with analysis of the systematic utility of scolex microtriches
Comparison of results with those from the seven other trypanorhynch species examined by previous authors with SEM indicates that there is much interspecific variability in both the morphology of microtriches present as well as their location on the scolex, and this, coupled with the lack of intraspecific variability, confirms that these structures are systematically informative.
Phylogenetic status of four new species of Acanthobothrium (Cestoda : Tetraphyllidea) parasitic on the wedgefish Rhynchobatus laevis (Elasmobranchii : Rhynchobatidae): implications for interpreting host associations
Preliminary phylogenetic analyses of sequence data of the D1–D3 region of 28S rDNA for three of the four new cestode species support previous work suggesting that congeners parasitising the same host species are not each other’s closest relatives.
The interrelationships of proseriata (Platyhelminthes: seriata) tested with molecules and morphology.
A new morphological matrix consisting of 16 putatively homologous characters and two molecular data sets to investigate further this major group of free-living members of the Platyhelminthes, where the monophyly of the Proseriata cannot be confirmed categorically with any of these data sets.
The seasonal occurrance of Trilocularia acanthiaevulgaris (Cestoda: Tetraphyllidea) from spiny dogfish in the Irish Sea
Seasonal trends in prevalence, mean worm burden and maturation of T. acanthiaevulgaris may be related to water temperature, and the cyclical changes in levels of reproductive hormones and thyroid activity associated with migration and mating of spiny dogfish.
Echinobothrium joshuai n. sp. (Cestoda: Diphyllidea) from the Roughnose Legskate, Cruriraja hulleyi (Rajiformes: Rajidae), off South Africa
A new species of diphyllidean cestode is described from Cruriraja hulleyi, a recently described species of skate collected off the coast of South Africa, which differs from all 39 of its valid congeners in its possession of “B” hooks.
Five new species of Acanthobothrium (Tetraphyllidea: Onchobothriidae) are described from the spiral intestine of the Freshwater whipray, Himantura chaophraya, in the Kinabatangan River in Malaysian Borneo, marking the first report of AcAnthobothium from freshwater stingrays belonging to a family other than the Potamotrygonidae.