scholarly journals Morphology of the synlophe and genital cone of Parostertagia heterospiculum (Trichostrongylidae) with comments on the subfamilial placement of the genus

1992 ◽  
Vol 22 (1) ◽  
pp. 1-16 ◽  
Author(s):  
E. P. Hoberg ◽  
J. R. Lichtenfels
Keyword(s):  
Genital Cone

Gastrointestinal nematodes of Paramelomys platyops (Rodentia: Muridae) from Papua Indonesia and Papua New Guinea with the descriptions of a new genus and five new species of Heligmonellidae (Nematoda: Trichostrongylina) and a key to the species of Hughjonestrongylus

Zootaxa ◽  
2019 ◽  
Vol 4679 (1) ◽  
pp. 107-125
Author(s):  
LESLEY SMALES
Keyword(s):  
Papua New Guinea ◽  
New Guinea ◽  
Gastrointestinal Nematodes ◽  
Bootstrap Analysis ◽  
Spicule Length ◽  
Genital Cone ◽  
Female Tail ◽  
Putative Species ◽  
Males And Females ◽  
Species Being

Nematodes from six families, comprising 20 species identified to genus level and three to subfamily level as well as juveniles and a heligmonellid that could not be identified further, were recovered from 34 individuals of Paramelomys platyops, one P. cf playops and one Melomys sp. (Muridae: Murinae: Uromys Division) from Papua Indonesia and Papua New Guinea. Ascaridid larvae, a capillariid, Capillaria s. l., two putative species of the Nippostrongylinae and a small number of heligmonellid males and females, could not be identified further. The rictulariid Pterygodermatites sp. (females only) had not been reported previously from Sahulan Old Endemic fauna while three species, the oxyurid Syphacia longecauda , the molineid Hepatojarakus pyknofasciatus, and the spirurid Protospirura kaindiensis, had. The remaining species, all heligmonellids, included the brevistriatine Macrostrongylus ingens and 14 nippostrongyline species. Of these, Hughjonestrongylus amplicauda, H. singauwaensis, Melomystrongylus sepikensis, Mawsonema mokwanense, Odilia mackerrasae and Parasabanema szalayi had been reported previously. Species of Hasanuddina, Montistrongylus and Sanduanensis possibly as yet undescribed, could not be identified further. Flannerystrongylus abulus n. gen., n. sp. differed from all 41 genera described to date in having a synlophe of 14–16 evenly sized ridges with a sub frontal orientation. Hasegawanema yuroense n. sp. with 21–23 synlophe ridges was distinguished from its congeners by a combination of characters including length of spicule, cuticularisation of the genital cone, the proportions of the ovejector and the size of the eggs. Hughjonestrongylus pervulgatus n. sp., H. vanimoensis n. sp. and H. wanumaensis n. sp. were distinguished from all other species of Hughjonestrongylus and each other by a combination of characters including the number of synlophe ridges 25–30, 18, 22–23 in the mid body respectively, and spicule length, proportions of the ovejector and shape of the female tail. A key to the species of Hughjonestrongylus is provided. Species richness was greater than that recorded for P. lorentzii and P. rubex with about 86% of possible species found, as indicated by bootstrap analysis. The helminth assemblage was dominated by heligmonellids with eight species being unique to P. platyops. Paramelomys lorentzii is found at altitudes up to 1500 m and may provide a link between the lowland P. platyops and the highland P. rubex, thus facilitating the distribution of helminth species held in common.  

Thelastoma gueyei sp. n. (Nematoda: Thelastomatidae) from the Senegal diplopod Archispirostreptus tumuliporus (Diplopoda: Spirostreptidae)

Nematology ◽  
2006 ◽  
Vol 8 (5) ◽  
pp. 739-747 ◽  
Author(s):  
Božena Koubková ◽  
Vlastimil Baruš ◽  
Iveta Matějusová ◽  
Iveta Hodová ◽  
Petr Koubek
Keyword(s):  
Ribosomal Rna ◽  
Morphological Characteristics ◽  
Total Body Length ◽  
Small Subunit ◽  
Species Group ◽  
The Body ◽  
Pharyngeal Bulb ◽  
Genital Cone ◽  
Tail Spike ◽  
Total Body

Abstract Thelastoma gueyei sp. n., a nematode belonging to the long-tailed species group of the genusThelastoma, is described from the diplopodArchispirostreptus tumuliporus (Spirostreptidae) collected in Niokolo Koba National Park (Senegal, West Africa).Thelastoma gueyei sp. n. is morphologically most similar toT. gipetiti. Females are characterised by: the vulva being situated in the posterior half of the body and near to the anus (V′ = 75-86) with the anterior vulval lip developed into a prominent flap; excretory pore located at the level of the anterior end of the pharyngeal bulb; b′ = 28-38 and tail, expressed as a proportion of L′, = 1.7-2.7. Males have narrow cuticular alae extending from about the middle of the pharynx to the level of the anteriormost pair of copulatory papillae; four pairs of copulatory papillae, two large, subventral, pairs being located adcloacally on the genital cone, a third, much smaller pair on the posterior margin of the genital cone and the last pair being situated at the mid-point of the tail spike; and a tail occupying 10.8-13.2% of the total body length. The distal tip of the spicule is drop-shaped. Morphological characteristics were studied using scanning electron microscopy and a comparison of the long-tailed group of thelastomatids is provided. Nucleic acid sequence of the small subunit ribosomal RNA gene was obtained for purposes of DNA barcoding.

Œsophagostomes of Goats, Sheep and Cattle

1924 ◽  
Vol 2 (3) ◽  
pp. 97-110 ◽  
Author(s):  
T. Goodey
Keyword(s):  
Type Species ◽  
The Other ◽  
Farm Animals ◽  
Anatomical Features ◽  
Genital Cone ◽  
General Plan

A Recent study by the writer (1924) on the type species of the genus Œsophagostomum, O. dentatum, from the pig, has brought to light certain interesting anatomical features and shown the desirability of a closer examination of the members of the genus occurring in other farm animals.Three species of these are well known, namely, O. columbianum, O. radiatum and O. venulosum, and have been dealt with fairly completely within recent years by Ransom (1911) and Railliet and Henry (1913), but even in the accounts of the worms given by these authors, there are certain differences concerning details of structure, which suggest the need for further investigation. Again, in studying O. dentatum, it was found that the genital cone of the male had a well defined structure, and it seemed of interest to determine whether the genital cones in the other species were built on the same general plan as that of O. dentatum, and whether they possessed specific differences from it and amongst themselvse

scholarly journals New species of Hassalstrongylus (Trichostrongyloidea: Heligmonellidae) in the large-headed rice rat Hylaeamys seuanezi, in the Atlantic Forest of northeast Brazil

2021 ◽  
Vol 30 (2) ◽  
Author(s):  
Natália Alves Costa ◽  
Rosana Gentile ◽  
Maíra Guimarães Kersul ◽  
Martin Roberto Del Valle Alvarez ◽  
Arnaldo Maldonado Junior
Keyword(s):  
Small Intestine ◽  
New Species ◽  
Atlantic Forest ◽  
Northeastern Brazil ◽  
Northeast Brazil ◽  
Genital Cone ◽  
Right Lobe ◽  
A New Species ◽  
Caudal Bursa

Abstract A new species of Trichostrongyloidea (Nematoda: Heligmonellidae), Hassalstrongylus lauroi n. sp., is described from specimens collected from the small intestine of the rodent Hylaeamys seuanezi in the Atlantic Forest of northeastern Brazil (Igrapiúna, state of Bahia). The genus Hassalstrongylus includes 17 species, which parasitize rodents occurring in the Neotropical and Nearctic regions. It differs from the genus Stilestrongylus through its smaller number of ridges in the synlophe and through the size of the genital cone. The main taxonomic characteristics of this new species are the subsymmetrical caudal bursa of type 2-2-1, ray 8 branching out at the base of the dorsal trunk, right lobe smaller than the left, and rays 4 and 5 of robust nature. In addition, the ornamental ray 5 and the robustness of ray 4 on the male caudal bursa, along with the modification of the ridges of the posterior end of the female, allow us to consider the specimens found to be a new species.

A new species, Apseudes larseni (Crustacea: Tanaidacea),from the marine waters of New Zealand

Zootaxa ◽  
2006 ◽  
Vol 1306 (1) ◽  
pp. 57 ◽  
Author(s):  
JULIANNE S. KNIGHT ◽  
RICHARD W. HEARD
Keyword(s):  
New Species ◽  
New Zealand ◽  
Morphological Similarity ◽  
Marine Waters ◽  
Genital Cone ◽  
Ventral Spine ◽  
A New Species

Apseudes larseni, new species, is described from the marine waters of New Zealand in depths of 108–1357 m. The new species belongs to a group of species characterized by the presence of lateral spines on both the carapace and pereonites. Apseudes larseni can be distinguished from all but one of these species, A. graciloides, by having two pairs of lateral spines on the carapace. Apseudes larseni also differs from A. graciloides by (1) the lateral spines of pereonite 1 having a different placement, (2) pereonite 2 having four pairs of lateral spines, as opposed to one pair in A. graciloides, (3) the cheliped with merus having a ventral spine (absent in A. graciloides) and a distinctly shorter and stouter carpus, and (4) pereopod 1 with basis lacking ventral spines (present in A. graciloides). The morphological similarity of the two sexes, especially in the similar cheliped and the apparent presence of a reduced genital cone on some female specimens, suggest the possibility that Apseudes larseni may be hermaphroditic.

Redescription of Monodontella giraffae Yorke et Maplestone, 1926 (Nematoda, Ancylostomatidae) from a giraffe, Giraffa camelopardalis, from Zoo in China, with a discussion on the taxonomic status of Monodontella

2010 ◽  
Vol 55 (1) ◽  
Author(s):  
Zhu Ming ◽  
Li Zhang ◽  
Luping Zhang
Keyword(s):  
Electron Microscopy ◽  
Scanning Electron Microscopy ◽  
Light Microscopy ◽  
Taxonomic Status ◽  
Biliary Duct ◽  
Giraffa Camelopardalis ◽  
Genital Cone ◽  
First Time ◽  
Scanning Electron

AbstractMonodontella giraffae Yorke et Maplestone, 1926 was collected from the biliary duct of liver of a dead giraffe, Giraffa camelopardalis (Linnaeus) from the Tianjin Zoo, Tianjin, China. A redescription of this species was made using light microscopy and scanning electron microscopy (SEM). The lateral alae and the detailed structures of the spicules and genital cone were observed for the first time by SEM. The taxonomic status of the genus is discussed.

On the specific distinctness of the ovine and bovine 'Strains' of Haemonchus contortus (Rudolphi) Cobb (Nematoda: Trichostronglidae).

1954 ◽  
Vol 2 (2) ◽  
pp. 275 ◽  
Author(s):  
FHS Roberts ◽  
H Newton-Turner ◽  
M McKevett
Keyword(s):  
Haemonchus Contortus ◽  
Tail Length ◽  
Distinct Species ◽  
Infective Larvae ◽  
Genital Cone ◽  
Total Length ◽  
Different Types ◽  
Parent Female ◽  
Two Populations ◽  
Haemonchus Placei

The investigations reported in this paper were undertaken to determine whether Haemonchus contortus from sheep and H. contortus from cattle are identical or different species. The length of the spicules and the distances from the hooks to the tips of the spicules were found to be significantly greater in males from cattle. Differences were also seen in the shape and dimensions of the appendage of the genital cone in males from the two hosts, but these were not constant. A study of adult females showed at least 14 different types of vulva1 process. In the majority (88.9 per cent.) of females from sheep there was a long, linguiform process, whereas in the majority (93.5 per cent.) of females from cattle the process was short and rounded. In experimental infestations, despite a change of host, these two types maintained their characteristics in accordance with the host of origin. The progeny of single females from sheep and cattle, respectively, gave a distribution of types similar to that of natural infestations in these hosts. The infective larvae from the two hosts were found to be visually distinct. Measurements showed significant differences in total length, tail length, and in the ratio of total length to tail length, larvae from cattle having the greater measurements and smaller ratio. A change of host did not alter these difference and no association was apparent between the type of larva and the type of vulva1 process in the parent female. In an experiment to test the ability of the two populations to interbreed, mixed sheep and cattle larvae were given to the same host. The subsequent generation of larvae could be classified into sheep and cattle types without any difficulty and there was no evidence of any intermediate types. Evidence of this reluctance to interbreed was also seen under conditions favouring cross-infestation in the field, when both types of larvae maintain their respective characteristics. In accordance with the above findings and as there is also evidence of some degree of host specificity, it is concluded that the populations in sheep and cattle represent distinct species. The name Haemonchus contortus (Rud. 1803) is retained for the species defined in this paper as occurring in sheep and the name Haemonchus placei (Place 1893) is proposed for the species occurring in cattle.

The Identity of Ostertagia trifurcata Ransom, 1907

1969 ◽  
Vol 43 (3-4) ◽  
pp. 365-370 ◽  
Author(s):  
M. B Lancaster
Keyword(s):  
Relevant Literature ◽  
Valid Species ◽  
Genital Cone

Some confusion exists as to the correct identity of Ostertagia trifurcata. The relevant literature is reviewed, and it is concluded that the observations of Sarwar (1954, 1956) pertaining to the identity of O. trifurcata are correct; that is that the genital cone possessed papillae. Teladorsagia davtiani is therefore a synonym of O. trifurcata and O. pinnata a valid species.

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