On the Structure and Classification of North American Parasitic Worms

Ward, Henry B.

doi:10.2307/3271103

Cited by 57 publications

(27 citation statements)

References 0 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…Barker (1915Barker ( , 1916 examined the adult echinostomes obtained from rodents and described several species such as Echinoparyphium contiguum, Echinostoma coalitum, E. armigerum and E. callawayensis. The first revision on the echinostomes from North America was published by Ward (1917). Johnson (1920) was the first to make observations on the life cycle of an echinostome.…”

Section: History Of Echinostomes 557mentioning

confidence: 99%

History of echinostomes (Trematoda)

Toledo

Radev

Kanev

et al. 2014

Acta Parasitologica

View full text Add to dashboard Cite

Echinostomatidae (Trematoda) is the largest family within the class Trematoda. Members of this family have been studied for many years in relation to their utility as basic research models in biodiversity and systematics and also as experimental models in parasitology since they offer many advantages. Echinostomes have contributed significantly to numerous developments in many areas studied by parasitologists and experimental biologists. In this review, we examine the history of the echinostomebased studies from the beginnings to the present. For this purpose, we have divided the history of echinostomes into four periods (i.e. 18 th and 19 th centuries, first half of the 20 th century, second half of the 20 th century and the late 20 th and 21 th century) according to the types of studies performed in each of them. Moreover, we also briefly review the history of echinostome infections in humans.

show abstract

Section: History Of Echinostomes 557mentioning

confidence: 99%

History of echinostomes (Trematoda)

Toledo

Radev

Kanev

et al. 2014

Acta Parasitologica

View full text Add to dashboard Cite

show abstract

“…Ward (1917) accepted the genus Pneumonoeces but stated that one group of flukes, in this genus, should be separated as a new genus, to which he applied the name Pneumobites and gave Pneumobites longiplexus (Haematoloechus longiplexus of Stafford (1902)) as the type of the genus. For personal use only.…”

Section: Introductionmentioning

confidence: 98%

A revision of species of the genus Haematoloechus Looss, 1899 (Trematoda: Haematoloechidae) from Canada and the United States

Kennedy¹

1981

Can. J. Zool.

View full text Add to dashboard Cite

KENNEDY, M. J. 1981. A revision of species of the genus Haematoloechus Looss, 1899 (Trematoda: Haematoloechidae) from Canada and the United States. Can. J. Zool. 59: 1836-1846. Previous experimental and field studies have shown that variations within the genus Haematoloechus may result from differences in age and degree of maturity, extent of crowding, species of host, and other factors. Based on these observations, only 6 of the 15 previously known species from Canada and the United States are considered valid. The valid species and their synonyms are as follows: Haematoloechus longiplexus Stafford, 1902; H. breviplexus Stafford, 1902;H. varioplexus Stafford, 1902 (= H. pamiplexus, = H. buttensis, = H. similiplexus, = H.jloedae, and H. uniplexus); H. kernensis Ingles, 1932 (= H. tumidus); H. medioplexus Stafford, 1902; and H. complexus (Seely, 1906) (= H. coloradensis, = H. confusus, = H. oxyorchis). The existence of three species groups is hypothesized. Haematoloechus longiplexus and H. breviplexus constitute one group, characterized by little geographical variation and a narrow host range. They are typically parasites of Rana catesbeiana and R. clamitans. Haematoloechus varioplexus and H. kernensis constitute the second group. These species have a wider host range and greater variation in characters purported to be specific differences. The third group includes those lung flukes which do not contain extracaecal loops (H. medioplexus and H. complexus). Of these, only H. medioplexus had little geographical variation and was found to occur in a single frog host. KENNEDY, M. J. 1981. A revision of species of the genus Haematoloechus Looss, 1899 (Trematoda: Haematoloechidae) from Canada and the United States. Can. J. Zool. 59: 1836-1846. Des Ctudes prkalables en laboratoire et en nature ont dCmontrC que les variations obsew6es chez le genre Haematoloechus peuvent rCsulter de differences d'ige, de degrC de maturitk, de densitk, du statut sp6cifique de l'hdte et d'autres facteurs. D'aprks ces observations, seulement six des quinze es@ces connues du Canadaet des Etats-Unis sont valides. Voici la liste des es@ces valides et de leurs synonymes:

show abstract

“…Vaginae are not mentioned in the species description (although they are depicted in the holotype illustration): the whole mount specimens show that the size and structure of their openings is remarkable amongst species of Polystomoides Ward, 1917. On each side of the body, the vaginae open on a prominent, broadly oval, mound of densely-stained tissue.…”

Section: Morphologymentioning

confidence: 99%

“…The distinctiveness of polystomatids infecting chelonians was recognised by Ward (1917) noting a "short uterus containing only a single egg". Stunkard (1917) employed the term 'uterus' for the chamber that contains the single egg and applied the name 'oötype' to the duct that receives the vitello-vaginal ducts and the oviduct.…”

Section: Terminologymentioning

confidence: 99%

“…All species, currently over 60 assigned to four genera, have a simplified reproductive system with only minor variations in the arrangement of internal organs. For the past 100 years (since Ward 1917), it has been considered that the major unifying characteristic across the chelonian polystomatids is the lack of a uterus: only a single egg is present at any one time, held within the chamber in which encapsulation occurs -the oötype.…”

mentioning

confidence: 99%

See 1 more Smart Citation

Reproductive innovation and the recognition of a new genus within the Polystomatidae (Monogenea) infecting chelonian vertebrates

Tinsley¹

2017

FOLIA PARASIT

View full text Add to dashboard Cite

Polystomatid monogeneans have a wide diversity of life cycles correlated with the varied ecology and behaviour of their aquatic vertebrate hosts. Typically, transmission involves a swimming infective larva but most hosts are amphibious and invasion is interrupted when hosts leave water. A key life cycle adaptation involves a uterus that, in the most specialised cases, may contain several hundred fully-developed larvae prepared for instant host-to-host transmission. By contrast, one subfamily of the Polystomatidae -the Polystomoidinae, specific to chelonians (freshwater turtles) -has a simplified reproductive system without a uterus. Recently, Polystomoides nelsoni Du Preez et Van Rooyen, 2015 has been described with a uterus containing multiple eggs. The present study explores the exceptional interest of this parasite -for the functional biology of egg production, for the evolution of a reproductive system unique amongst ca 60 species in the subfamily, and for systematic relationships. A new genus is proposed, Uteropolystomoides gen. n., separate from the four currently-recognised genera Polystomoides Ward, 1917, Uropolystomoides Tinsley et Tinsley, 2016, Neopolystoma Price, 1939 and Polystomoidella Price, 1939 which lack a uterus. In addition, U. nelsoni (Du Preez et Van Rooyen, 2015) comb. n. has a suite of distinctive copulatory stuctures: a massive genital bulb with an exceptionally large number of very long genital spines and hyper-development of the vaginal openings. These characters set U. nelsoni apart from all other polystomoidines worldwide except Polystomoides multifalx Stunkard, 1924 and P. stunkardi Harwood, 1931. Missing data for these latter species preclude definitive assessment of inter-relationships but the distinguishing characters of U. nelsoni, especially the unique occurrence of the uterus, suggest a novel evolutionary pathway isolated from other lineages of polystomatids infecting chelonians.

show abstract

On the Structure and Classification of North American Parasitic Worms

Cited by 57 publications

References 0 publications

History of echinostomes (Trematoda)

History of echinostomes (Trematoda)

A revision of species of the genus Haematoloechus Looss, 1899 (Trematoda: Haematoloechidae) from Canada and the United States

Reproductive innovation and the recognition of a new genus within the Polystomatidae (Monogenea) infecting chelonian vertebrates

Contact Info

Product

Resources

About