Paraheligmonella romerolagi

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Paraheligmonella romerolagi
Systematics
Subordination : Strongylida
Superfamily : Trichostrongyloidea
Family : Heligmonellidae
Subfamily : Heligmonellinae
Genre : Paraheligmonella
Type : Paraheligmonella romerolagi
Scientific name
Paraheligmonella romerolagi
( Gibbons & Kumar , 1980)

Paraheligmonella romerolagi is a nematode which parasites in the duodenum of the volcano rabbit lives.

description

Male Paraheligmonella romerolagi have a body length of 2.83 to 3.61 millimeters with a diameter of 0.053 to 0.067 millimeters, measured in front of the bursa copulatrix . The head has a diameter of 0.026 to 0.038 millimeters, and carries a 0.048 to 0.058 millimeter long appendage. The sensory papillae are 0.197 to 0.290 millimeters and the excretion pore 0.208 to 0.209 millimeters from the front end. A ring nerve was not found. The esophagus is 0.269 to 0.306 millimeters long. The cuticula has 14 longitudinal grooves that extend from the posterior edge of the head extension to just before the bursa copulatrix , and the outer ones are particularly pronounced.

The bell-shaped bursa copulatrix has two large lateral and one inconspicuous dorsal lobes. Its ventral rays are long and thin, the two outer rays form a pointed process on the lateral lobes. The dorsal and dorsolateral rays are divided several times. The two thin, undivided spicules are 0.249 to 0.279 millimeters long and their tips touch each other. The small and weakly chitinized gubernaculum is 0.019 to 0.021 millimeters long and 0.005 to 0.006 millimeters wide. A large spherical genital horn without genital papillae is present.

Female Paraheligmonella romerolagi have a body length of 4.12 to 5.22 millimeters and a diameter of 0.084 to 0.113 millimeters, measured at the vulva. The head diameter is 0.036 to 0.043 millimeters, the head extension is 0.055 to 0.065 millimeters long. The sensory papillae are 0.243 to 0.300 millimeters and the excretion pore 0.272 to 0.290 millimeters from the front end. A ring nerve was not found. The esophagus is 0.310 to 0.345 millimeters long. The cuticle has 14 longitudinal grooves that extend ventrally from the posterior edge of the head extension to just before the vulva and dorsally to the genital opening, and the outer grooves are particularly pronounced.

Each of the two ovaries is 0.089 to 0.109 millimeters long, the fallopian tubes are 0.091 to 0.137 millimeters in length. The genital opening is 0.090 to 0.139 millimeters from the rear end of the body, the tail is 0.24 to 0.036 millimeters in length. The eggs in the uterus are 0.062 to 0.079 millimeters long and 0.031 to 0.041 millimeters in diameter.

distribution

The type host and only known host of Paraheligmonella romerolagi is the volcanic rabbit ( Romerolagus diazi ). The volcanic rabbit is endemic to the central Mexican Sierra Volcánica Transversal with several small and isolated distribution areas that cover less than 400 square kilometers.

As a species-specific parasite, Paraheligmonella romerolagi is subject to the same threat to the population as its host. The volcano rabbit is on the International Union for Conservation of Nature and Natural Resources (IUCN) due to the very small distribution area and the strong population declines as threatened ( endangered classified).

Way of life

Paraheligmonella romerolagi lives parasitically in the duodenum of the volcanic rabbit.

Systematics

Initial description

The first description of Paraheligmonella romerolagi was as Boreostrongylus romerolagi by the British helminthologist Lynda M. Gibbons and her colleague Vinai Kumar in an article published in 1980 in the journal Systematic Parasitology .

For the first description, 13 male and 15 female roundworms from the duodenum of a volcanic rabbit that died in quarantine at Antwerp Zoo were available.

The species name romerolagi refers to the genus Romerolagus with the only species Romerolagus diazi , the volcanic rabbit, as the only known host of Paraheligmonella romerolagi .

The type specimens were included in the type collection of the Commonwealth Institute of Helminthology and, after its closure, housed in the Natural History Museum in London . One male and one female syntype are in the collection of the Museo de La Plata in Buenos Aires, two male and female syntypes each in the Colección Nacional de Helmintos of the Universidad Nacional de México .

Synonyms

  • Longistriata dubia sensu Bravo Hollis nec ( Travassos , 1921): In 1950 the Brazilian helminthologist Margarita Bravo Hollis described a number of parasitic worms of Mexican rabbits . This also included a nematode from the duodenum of volcanic rabbits identified by her as Longistriata dubia (currently Viannella dubia ( Travassos , 1921)). In preparing the initial description, Gibbons and Kumar were able to refer to Hollis' material and determine that it was the same species as the one they newly described.
  • Boreostrongylus romerolagi Gibbons & Kumar , 1980: the authors of the first description referred already to the fact that the structure of Synlophe the classification of the species in the genera Boreostrongylus or Paraheligmonella suggests. They opted for the genus Boreostrongylus because of the arrangement of the rays of the bursa copulatrix , the pronounced genital papilla and the existing gubernaculum. The French helminthologist Marie-Claude Durette-Desset from the Muséum national d'histoire naturelle synonymized the genus Boreostrongylus with Carolinensis in 1983 .
  • Carolinensis romerolagi ( Gibbons & Kumar , 1980): Together with her colleague III Alberto Santos from the Texas State University presented Durette-Desset the way in 2000 in the genre Paraheligmonella . They justified this with the special characteristics of the synlophe, namely the hypertrophy of the outer grooves on the cuticle, which distinguishes romerolagi from all other species of the genus Carolinensis .

literature

  • Lynda M. Gibbons, Vinai Kumar: Boreostrongylus romerolagi n.sp. (Nematoda, Heligmonellidae) from a Mexican volcano rabbit, Romerolagus diazi . In: Systematic Parasitology 1980, Volume 1, No. 2, pp. 117-122, doi : 10.1007 / BF00009857 .

Individual evidence

  1. ↑ a b c Lynda M. Gibbons, Vinai Kumar: Boreostrongylus romerolagi n.sp. , P. 117.
  2. ↑ Lynda M. Gibbons, Vinai Kumar: Boreostrongylus romerolagi n.sp. , Pp. 117-121.
  3. ↑ a b c d Lynda M. Gibbons, Vinai Kumar: Boreostrongylus romerolagi n.sp. , P. 121.
  4. ↑ a b c d Lynda M. Gibbons, Vinai Kumar: Boreostrongylus romerolagi n.sp. , P. 122.
  5. ↑ Romerolagus diazi in the IUCN Red List of Threatened Species 2017.3. Listed by: Mexican Association for Conservation and Study of Lagomorphs (AMCELA), FJ Romero Malpica, H. Rangel Cordero, PC de Grammont, AD Cuarón, 2008. Retrieved April 23, 2018.
  6. ↑ Lia I. Luna ski et al .: Type material Housed in the Helminthological Collection of the Museo de La Plata, Buenos Aires, Argentina . In: Zootaxa 2012, No. 3199, pp. 1–59, here p. 13, doi : 10.5281 / zenodo.208967 .
  7. ^ Margarita Bravo Hollis: Estudio de nemátodos parásitos de los lepóridos del Distrito Federal . In: Anales del Instituto de Biologia Mexico 1950, Volume 21, pp. 103-118, ZDB -ID 413138-1 .
  8. ^ Marie-Claude Durette-Desset: Keys to Genera of the Super-Family Trichostrongyloidea . In: RC Anderson and AG Chabaud (Eds.): CIH Keys to the Nematode Parasites of Vertebrates, No. 10 . Commonwealth Agricultural Bureau, Farnham Royal 1983.
  9. ^ Marie-Claude Durette-Desset and Alberto Santos III: Carolinensis tuffi sp. n. (Nematoda: Trichostrongylina: Heligmosomoidea) from the White-Ankled Mouse, Peromyscus pectoralis Osgood (Rodentia: Cricetidae) from Texas, USA In: Comparative Parasitology 2000, Volume 67, No. 1, pp. 66-70, ISSN  1049- 233X .