Tetrahymena chironomi sp.nov., a ciliate from midge larvae, and the current status of facultative parasitism in the genus Tetrahymena

Parasitology ◽  
1960 ◽  
Vol 50 (1-2) ◽  
pp. 111-153 ◽  
Author(s):  
John O. Corliss
Keyword(s):  
New Species ◽  
Body Cavity ◽  
Fourth Instar ◽  
The Body ◽  
Current Status ◽  
Free Living ◽  
Large Numbers ◽  
Laboratory Cultures ◽  
A New Species ◽  
Large Spherical

A holotrichous ciliate found repeatedly in very large numbers in the body cavity of larval midges (Chironomus plumosus) from Paris and Berlin areas is described as a new species of the genus Tetrahymena, named T. chironomi sp.nov. It appears to represent a true example of facultative parasitism, since parasites released from the host survive in laboratory cultures, and free-living ciliates believed identical have been isolated from fresh-water sources in nature. Over a 3-month period more than 2000 larvae, principally fourth-instar stages, were examined; about 9 % of these were found to be infected with ciliates.T. chironomi is the thirteenth species to be added to the growing holotrich hymenostome genus Tetrahymena. It is taxonomically distinguishable from other members of the genus on the basis of a combination of characteristics related to its morphology and bionomics. It is one of the smallest species, has 24–27 ciliary meridians and a relatively large, spherical micronucleus, does not exhibit dimorphism or cystic stages in its life cycle, and does not possess a caudal cilium.

Spiroplasma burmanica sp. nov. (Spiroplasmataceae: Mollicutes) from a Fossil Plant Louse (Psylloidea: Sternorrhyncha) in mid-Cretaceous Burmese Amber

2020 ◽  
Vol 1 (4) ◽  
pp. 157-163
Author(s):  
George Poinar
Keyword(s):  
New Species ◽  
Body Cavity ◽  
The Body ◽  
Fossil Plant ◽  
Burmese Amber ◽  
Body Shapes ◽  
A New Species

A new species of spiroplasmid, Spiroplasma burmanica sp. nov. (Mollicutes: Entomoplasmatales: Spiroplasmataceae) is described from the body cavity of a fossil plant louse (Psylloidea: Sternorrhyncha) in Burmese amber.  The new species is pleomorphic with body shapes varying from oval to helical.  The majority of the helical cells occur in the head, thorax (including leg cavities) and abdomen of the fossil psyllid.   The association between S. burmanica and the psyllid is considered to be a case of symbiosis, similar to extant relationships.  This discovery of the first fossil spiroplasmid shows that psyllids carried these microorganisms some 100 million years ago.

scholarly journals A new species of Monstrilla (Copepoda, Monstrilloida) from the plankton of a large coastal system of the northwestern Caribbean with a key to species

ZooKeys ◽  
2019 ◽  
Vol 876 ◽  
pp. 111-123
Author(s):  
Eduardo Suárez-Morales ◽  
Iván A. Castellanos-Osorio
Keyword(s):  
New Species ◽  
Zooplankton Community ◽  
Key To Species ◽  
Free Living ◽  
Coastal System ◽  
Large Numbers ◽  
Mexican Caribbean ◽  
Males And Females ◽  
The Caribbean ◽  
A New Species

The genus Monstrilla Dana, 1849 is the most diverse of the copepod order Monstrilloida. Monstrilloid copepods are endoparasites of benthic polychaetes and molluscs; adult individuals are free-living, non-feeding reproductive forms that briefly become part of the zooplankton community, where they are occasionally captured by plankton nets. Monstrilloid copepods are frequently found during routine plankton samplings of coastal and estuarine habitats, but they are rarely found in large numbers. The western sector of the Caribbean Sea is known to harbor a diverse monstrilloid fauna. The analysis of zooplankton samples obtained during nine years from Chetumal Bay, a large embayment of the Mexican Caribbean coast, yielded a male monstrilloid that was found to represent a new species. It is herein described following upgraded standards and compared with its congeners. A key to males and females of the Monstrilla species known from the northwestern Caribbean is also provided.

On a New Species of the Genus Saurositus from an Indian lizard

1965 ◽  
Vol 39 (2-3) ◽  
pp. 137-140
Author(s):  
P. G. Deshmukh ◽  
S. Mehdi Ali
Keyword(s):  
New Species ◽  
Connective Tissue ◽  
Body Cavity ◽  
The Body ◽  
Body Diameter ◽  
Calotes Versicolor ◽  
Maximum Body ◽  
A New Species

Three specimens of this species were collected on one occasion from the lizard Calotes versicolor. The material consists of one male and two females which were found entangled in the connective tissue of the body cavity.These are thin worms measuring 11·5 mm. long in the male and 18·3 mm. in the female. The maximum body diameter is 0·23 and 0·35 mm. respectively in the male and the female.

A new species from Mexico of the Nearctic genus Percymoorensis, and remarks on the family Haemopidae (Hirudinoidea)

1971 ◽  
Vol 49 (8) ◽  
pp. 1095-1103 ◽  
Author(s):  
Laurence R. Richardson
Keyword(s):  
New Species ◽  
Body Cavity ◽  
The Body ◽  
Reproductive Systems ◽  
The Family ◽  
A New Species

P. caballeroi sp. nov. has bimyomeric megamorphic median regions on the reproductive systems, both extended in the paramedian chambers of the body cavity. It differs from P. marmoratis in having pale maculae forming a simple somital pattern, unequal annuli on the midnephric somites, and a postanal chamber. The genera Philobdella and Semiscolex are excluded from the Haemopidae, and subfamilies Haemopinae and Mollibdellinae are proposed.

An integrative taxonomic study reveals a new species ofTylodelphysDiesing, 1950 (Digenea: Diplostomidae) in central and northern Mexico

2015 ◽  
Vol 90 (6) ◽  
pp. 668-679 ◽  
Author(s):  
M. García-Varela ◽  
A.L. Sereno-Uribe ◽  
C.D. Pinacho-Pinacho ◽  
E. Hernández-Cruz ◽  
G. Pérez-Ponce de León
Keyword(s):  
New Species ◽  
Dna Sequences ◽  
Genetic Divergence ◽  
Phylogenetic Trees ◽  
Body Cavity ◽  
The Body ◽  
Internal Transcribed Spacers ◽  
Morphological Evidence ◽  
Northern Mexico ◽  
A New Species

AbstractTylodelphys aztecaen. sp. (Digenea: Diplostomidae) is described from adult specimens obtained from the intestine of the pied-billed grebe (Podilymbus podiceps) and the metacercariae found in the body cavity of freshwater fishes of the families Goodeidae and Cyprinidae in eight localities across central and northern Mexico. The new species is mainly distinguished from the other four described species ofTylodelphysfrom the Americas (T. adulta, T. americana, T. elongataandT. brevis) by having a forebody slightly concave, a larger ventral sucker, two larger pseudosuckers and by having between 2 and 7 eggs in the uterus. Partial DNA sequences of the mitochondrial gene cytochromecoxidase subunit I (cox1), and the internal transcribed spacers (ITS1+5.8S+ ITS2) of the ribosomal DNA, were generated for both developmental stages and compared with available sequences in GenBank of other congeners. The genetic divergence estimated amongTylodelphys aztecaen. sp. and other congeneric species varied from 12 to 15% forcox1, and from 3 to 11% for ITS. In contrast, the genetic divergence among metacercariae and adults of the new species was very low, ranging between 0 and 1% forcox1and between 0 and 0.3% for ITS. Phylogenetic analyses inferred with both molecular markers using maximum likelihood and Bayesian inference placed the adults and their metacercariae in a single clade, confirming that both stages are conspecific. The morphological evidence and the genetic divergence, in combination with the reciprocal monophyly in both phylogenetic trees, support the hypothesis that the diplostomids found in the intestines of the pied-billed grebe bird and the body cavity from goodeid and cyprinid fishes in central and northern Mexico represent a new species.

Endeolophos skeneae sp. nov. (Chromadoridae)—a free-living marine nematode epibiotically associated with deep-sea gastropod Skenea profunda (Skeneidae)

2010 ◽  
Vol 91 (2) ◽  
pp. 387-394 ◽  
Author(s):  
Oleksandr Holovachov ◽  
Sven Boström ◽  
Nicole Reid ◽  
Anders Warén ◽  
Christoffer Schander
Keyword(s):  
New Species ◽  
Dreissena Polymorpha ◽  
Mantle Cavity ◽  
The Body ◽  
Marine Nematode ◽  
Bivalve Molluscs ◽  
Free Living ◽  
Long Tail ◽  
Symbiotic Associations ◽  
A New Species

A new species, Endeolophus skeneae sp. nov., epibiotically associated with the gastropod Skenea profunda, is described from light microscope and scanning electron microscope observations. The new species is characterized by homogeneous ornamentation of the cuticle with annules with very fine and numerous longitudinal ridges, equally distributed around the body, subcuticular discontinuity in cuticle pattern along the lateral sectors of the body, relatively long body (1.1–1.6 mm) and relatively long tail (141–188 μm, c' = 7.5–11.4), short (19–22 μm) L-shaped spicules with ventrally bent blade and simple plate-like gubernaculum without apophysis. Symbiotic associations between aquatic nematodes and molluscs are discussed, with special emphasis on Dreissena polymorpha, zebra mussels. It is suggested that nematodes find food and shelter in the mantle cavity of the bivalve molluscs, and in the umbilicus and aperture of the gastropods, but to reveal the exact mechanisms of symbiotic associations of nematodes with aquatic molluscs requires further research.

On a New Species of Splendidofilaria Skrjabin, 1923 from India

1960 ◽  
Vol 34 (1-2) ◽  
pp. 139-140 ◽  
Author(s):  
S. Amir ◽  
S. M. Ali
Keyword(s):  
New Species ◽  
Body Cavity ◽  
The Body ◽  
A New Species

During the tour in Kashmir, two males and four females of the species to be described were collected from the vicinity of the heart and the body cavity of the white cheeked Bulbul, Molpastes leucogenys leucogenys.These are rather slender worms with attenuated anterior ends. The posterior ends are twisted into 2–3 coils. The cuticle is thin, smooth, nonstriated, but richly furnished with bosses throughout the length of the body.

A new species of Otobothrium (Cestoda, Trypanorhyncha) from Australian fishes

Parasitology ◽  
1954 ◽  
Vol 44 (1-2) ◽  
pp. 65-70 ◽  
Author(s):  
Ian D. Hiscock
Keyword(s):  
New Species ◽  
Body Cavity ◽  
The Body ◽  
Mugil Cephalus ◽  
The Common ◽  
A New Species

In April 1953, several specimens of the common commercial mullet, Mugil cephalus L., heavily infested with cysts in the body cavity, were received. In May, June and July 1953, several specimens of the estuarine catfish, Netuma australis (Gunther) (Family Ariidae), similarly infected, came to hand. All specimens were taken from the lower reaches of the Brisbane River, Brisbane.

Steinernema borjomiense n. sp. (Rhabditida: Steinernematidae), a new entomopathogenic nematode from Georgia

Nematology ◽  
2018 ◽  
Vol 20 (7) ◽  
pp. 653-669 ◽  
Author(s):  
Oleg Gorgadze ◽  
Elena Fanelli ◽  
Manana Lortkhipanidze ◽  
Alberto Troccoli ◽  
Medea Burjanadze ◽  
...  
Keyword(s):  
New Species ◽  
18S Rrna ◽  
Entomopathogenic Nematode ◽  
Phylogenetic Analyses ◽  
Tail Length ◽  
Morphological Characters ◽  
18S Rrna Gene ◽  
The Body ◽  
Rrna Gene ◽  
A New Species

Summary A new species of entomopathogenic nematode, Steinernema borjomiense n. sp., was isolated from the body of the host insect, Oryctes nasicornis (Coleoptera: Scarabaeidae), in Georgia, in the territory of Borjomi-Kharagauli. Morphological characters indicate that the new species is closely related to species of the feltiae-group. The infective juveniles are characterised by the following morphological characters: body length of 879 (777-989) μm, distance between the head and excretory pore = 72 (62-80) μm, pharynx length = 132 (122-142) μm, tail length = 70 (60-80) μm, ratio a = 26.3 (23.0-29.3), H% = 45 (40-51), D% = 54 (47-59), E% = 102 (95-115), and lateral fields consisting of seven ridges (eight incisures) at mid-body. Steinernema borjomiense n. sp. was molecularly characterised by sequencing three ribosomal regions (the ITS, the D2-D3 expansion domains and the 18S rRNA gene) and the mitochondrial COI gene. Phylogenetic analyses revealed that S. borjomiense n. sp. differs from all other known species of Steinernema and is a member of the monticolum-group.

ENCAPSULATION OF RHABDITOID NEMATODES IN MOSQUITOES

1962 ◽  
Vol 40 (7) ◽  
pp. 1269-1275 ◽  
Author(s):  
Joan F. Bronskill
Keyword(s):  
Aedes Aegypti ◽  
Endemic Species ◽  
Body Cavity ◽  
Fourth Instar ◽  
The Body ◽  
Histological Structure ◽  
Adult Tissue ◽  
Defence Reaction ◽  
Blood Sinus

In third and fourth instar larvae of Aedes aegypti (L.), juveniles of the rhabditoid, DD136, penetrate the blood sinus and cardial epithelium of the proventriculus to enter the body cavity of the host, where they complete their development. By 5 hours, a thick capsule developed about many of the ensheathed immature adults of DD136 within the body cavity of A. aegypti larvae. This rapid defence reaction of the mosquito to DD136, which has both a melanin and a cellular manifestation, occurs both in the exotic mosquito A. aegypti and in the two endemic species tested, Aedes stimulans (Walker) and Aedes trichurus (Dyar). The resistance of A. stimulans to an endemic rhabditoid, possibly of the Diplogasteridae, is also similar. The histological structure of the capsule is not affected during metamorphosis in A. aegypti; however, during histogenesis of adult tissue displacement and (or) distortion of some tissues and organs may be caused by the presence of the capsule within the host's body cavity. The activity of the adult A. aegypti is normal when this distortion or displacement is minor. Though usually encapsulated DD136 are retained within the body cavity of A. aegypti during metamorphosis, sometimes they are partially or completely expelled from the host's body cavity at the time of molting.

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