User:Mattximus/sandbox10

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Mattximus/sandbox10
Scientific classification Edit this classification
Domain: Eukaryota
Kingdom: Animalia
Phylum: Acanthocephala
Class: Archiacanthocephala
Order:
Gigantorhynchida
Family:
Gigantorhynchidae
Genus: Gigantorhynchus
Hamann, 1892[1]

Gigantorhynchus is a

testes. Gigantorhynchus is considered a well-supported monophyletic group with the related Mediorhynchus genus in the Gigantorhynchidae family based on genetic analysis. There are six species in this genus distributed across Central and South America and possibly Zimbabwe
.

Taxonomy

The name Gigantorhynchus[a] was chosen based on the large size and characteristic proboscis in this genus of Acanthocephala.[1] Phylogenetic analysis has been conducted on only one species in the genus, G. echinodiscus, using the gene for 28S ribosomal RNA and confirms that these morphological distinctions form a well-supported monophyletic group with the related Mediorhynchus genus in the Gigantorhynchidae family.[2] The type species is G. echinodiscus.[3]

Archiacanthocephala
Archiacanthocephala
Oligacanthorhynchidae

Macracanthorhynchus ingens

Oncicola venezuelensis

Oligacanthorhynchus tortuosa

Nephridiacanthus major

Moniliformidae

Moniliformis moniliformis

Gigantorhynchida

Mediorhynchus sp.

Gigantorhynchus echinodiscus

Phylogenetic reconstruction for select species in the class Archiacanthocephala[2][4]

Description

The genus Gigantorhynchus is characterized by the presence of a cylindrical

testes are ellipsoid.[2] Species of Gigantorhynchus are distinguished based on the number and size of hooks on the crown of the proboscis, the type of pseudosegmentation, and size of the eggs.[2] Males of all species possess eight cement glands which are used to temporarily close the posterior end of the female after copulation.[6]

Scientific name
Author 		Number of proboscis hooks (arrangement) Length of proboscis in mm (female/male) Width of proboscis in mm (female/male) Length of trunk in mm (female/male) Width of trunk in mm (female/male) Length of lemnisci in mm
G. echinodiscus
(Diesing, 1851) 		18 (6+12) 0.55
0.50 		0.48
0.30–0.52 		75.45
31.53 		0.85
0.78 		14.87
G. lopezneyrai
Diaz-ungria, 1958 		12
G. lutzi
Machado, 1941 		12 (6+6)
G. ortizi
Sarmiento, 1954 		12 (6+6) unknown
1.45–1.72 		unknown
0.435–0.555 		130–242
46–75 		1.5–2.0
1.4–1.92 		5.48–6.80
G. pasteri
Tadros, 1966 		4 unknown
0.35 		unknown
0.1 		15–18
unknown 		0.8–0.9
unknown 		3.6–4
G. ungriai
Antonio, 1958 		18 (6+12) unknown
0.189–1.0 		unknown
0.237–0.7 		129–136
22–36 		1–1.6
0.78–1.58 		1.75–3.27

Species

There are six valid species in the genus Gigantorhynchus,[3][7] although one species, G. pasteri, appears to be incorrectly assigned.[2]

  • Gigantorhynchus echinodiscus (Diesing, 1851)[8][b]

G. echinodiscus is a tropical parasite of anteaters including the

Trinidad Island.[11] Intermediate hosts include two species of termites from Brazil (Labiotermes emersoni and Orthognathotermes heberi) that showed head shape abnormalities and discolouration when infested with G. echinodiscus in an encysted larval state.[12] It is the first species to be described in the genus Gigantorhynchus and is the type species.[3]

Morphological traits used to distinguish the species include a cylindrical

testes, eight cement glands in pairs occupying a region measuring between 0.98 and 2.13 mm long and between 0.45 and 0.76  mm wide, and a non-segmented region in the posterior end of the body.[2]

Males have a body length between 14.80 and 45.29 mm and a width between 0.53 and 0.99 mm and the proboscis and neck are 0.45 to 0.65 mm long and 0.30 to 0.55 mm wide. The female is larger, with a body length of 52.92 to 102.79 mm long and 0.79 to 1.13 mm wide and the proboscis and neck are between 0.49 and 0.71 mm long and 0.46 and 0.53 mm wide. The proboscis receptacle is between 0.48 and 0.64 mm long and between 0.21 and 0.32 mm wide in the male and between 0.63 and 0.74 mm long and between 0.23 and 0.31 mm wide in the female. The male has two ellipsoid testes that are narrow and in tandem with the anterior testis being between 1.63 and 2.71 mm long and 0.26 and 0.32 mm wide and the posterior testis being between 1.61 and 2.66 mm long and 0.26 and 0.39 mm wide. The posterior end after the anterior testes without a segmentation region measures between 5.45 and 8.53 mm. In the female, the gonopore is subterminal and vagina has a sinuous lateral region in a “guitar” format. The genital pore including the vagina, uterus, and uterine bell is between 0.69 and 0.97 mm long. The eggs are ellipsoid being between 0.059 and 0.069 mm long and between 0.04 and 0.03 mm wide and contain three membranes.[2]

  • Gigantorhynchus lopezneyrai Diaz-ungria, 1958[9]

G. lopezneyrai has been found parasitizing the Southern tamandua (Tamandua tetradactyla) in Venezuela.[2] The male trunk is slightly segmented and between 16 and 58 mm long and 1 to 1.7 mm wide and no female trunk measurements are known. The proboscis is between 1.131 and 1.5 mm long and 0.66 mm wide. There are 12 hooks on the proboscis (4 in the first circle each around 0.235 mm long, and 8 in the second circle each around 0.106 mm long). The lemnici are 8 mm and the worms have eight cement glands organized in pairs. The anterior testes measure 0.7 by 0.190 mm.[2] There are doubts about the validity of this species raised by Amato (2014) who suggests that the hook number and arrangement is an incorrect observation that needs to be revisited as no drawings of the proboscis showing the hook formation was published.[12] This species is named in honour of Carlos Rodríguez López-Neyra de Gorgot, a Spanish parasitologist.[9]

  • Gigantorhynchus lutzi Machado, 1941[13]

G. lutzi has been found parasitising a

Huanuco, Peru.[2] It was the second species in the genus Gigantorhynchus to be described. The body is ringed, with no complete segmentation. The male trunk is slightly segmented and between 35 and 60 mm long and 0.75 to 1.15 mm wide and the female trunk is longer between 130 and 200 mm long and wider between 1 and 2.5 mm. The proboscis is 1.695 mm long and 0.735 mm wide. There are 12 hooks on the proboscis (six in the first circle each measuring 0.285 by 0.165 mm, and six in the second circle measuring 0.225 by 0.135 mm). The small rootless spines are 0.048 mm long. The lemnici are on average 2.595mm, and there are eight cement glands organized in pairs. The anterior testes measure 5.752–6.045 by 0.750 to 0.900 mm and the eggs are 0.115 by 0.064 mm.[2]

G. ortizi has been found infesting the intestines of the

ornithologist from the Museum of the University of San Marcos, Lima, Peru who collected the brown four-eyed opossum from La Merced, Junin, Peruw, hich later was determined to have been infested with this new species of acanthocephalan.[14] The body is ringed, with no complete segmentation. The male trunk is slightly segmented and between 46 and 75 mm long and 1.4 to 1.92 mm wide and the female trunk is longer between 130 and 242 mm long and wider between 1.5 and 2.0 mm. The proboscis is between 1.45 and 1.72 mm long and between 0.435 and 0.555 mm wide. There are 12 hooks on the proboscis (six in the first circle each measuring 0.160 by 0.10 mm, and six in the second circle measuring 0.140 by 0.09 mm). The small rootless spines are 0.05 mm long. The proboscis receptacle is 0.750 to 0.920 mm long. The lemnici are between 5.48 and 6.80 mm, and there are eight cement glands organized in groups. The anterior testes measure 1.98 to 3.0 by 0.56 to 0.96 mm and the eggs are 0.079 to 0.085 by 0.049 to 0.054 mm.[14]

G. pasteri was recorded from an unknown baboon species in Rhodesia (now Zimbabwe).[12][17] Gomes (2019) considers this species to be incorrectly assigned due to a lack of information including missing registration number and deposit of specimen in a collection, missing type host species, and the description being based on only two immature females.[2] Of the two immature female specimens: the trunk was between 15 to 18 mm long and 0.8 to 0.9 mm wide. The proboscis was 0.35 mm long and 0.1 mm wide with 4 hooks 0.03 mm long. The small rootless spines were 0.015 mm long and the proboscis receptacle was 0.75 mm by between 0.18 and 0.2 mm in size. The lemnisci are between 3.6 and 4 mm long.[17]

  • Gigantorhynchus ungriai Antonio, 1958[18]

G. ungriai has been found parasitizing a Southern tamandua (Tamandua tetradactyla) in Guayo, Delta Amacuro, Venezuela. The body is ringed and has a cylindrical shape with a complete segmentation consisting of a union in dorsal and ventral regions. The male trunk is between 22 and 36 mm long and 0.78 and 1.58 mm wide whereas the female is much larger with a trunk length of 129 to 136 mm and a width of 1 to 1.6 mm. The anterior end without segmentation measures 2 to 2.6 mm long. The retractable proboscis is 0.189 to 1.0 mm long and 0.237 to 0.7 mm wide with 18 hooks arranged in two circular rows. The first row has six hooks that are 0.140 to 0.2 mm long and the second row has 12 hooks that are 0.104 to 0.180 mm long. The small rootless spines were 0.02 to 0.06 mm long and the lemnicsi were 1.75 to 3.27 mm long in the male. There are eight cement glands occupying a space of 0.869 by 0.1896 mm. The eggs measure 0.04 to 0.06 mm by 0.04 mm.[2][18] The female genital tract made of an ovary-uterus extends throughout the length of the body. The male genitals occupies one quarter of the length of the body and contains elliptical testicles with the anterior testes measuring between 2.0 and 5.6 by 0.395 and 0.474 mm and eight peripheral prostate glands.[2][18] The species name was named after Carlos Díaz Ungría.[18]

Hosts

Gigantorhynchus species infest

marsupials and myrmecophagids (anteaters) in Central and South America and possibly a baboon from Africa.[2] They are found in the intestines.[19] The intermediate host includes termites
.

Notes

  1. ^ The name derives from the size ("Wie der Name besagt, sind es große Formen, die hierher gehören.")[1] and Ancient Greek word rhúnkhos, which means snout, nose, or beak.
  2. ^ A binomial authority in parentheses indicates that the species was originally described in a genus other than Gigantorhynchus. This species was originally named Echinorhynchus echinodiscus by Karl Moritz Diesing in 1851 but moved to Gigantorhynchus by Hamann in 1892.[3]

References

  1. ^ a b c Hamann, O. (1892). "Das system der Acanthocephalen". Zoologischer Anzeiger (in German). 15: 195–197. Retrieved 24 January 2020.
  2. ^
    doi:10.1016/j.ijppaw.2019.09.008
    .
  3. ^
    PMID 24261131. Archived
    (PDF) from the original on 10 August 2017. Retrieved 27 September 2019.
  4. PMID 32114988
    .
  5. ^ Bhattacharya, S. B. (2007). Handbook on Indian Acanthocephala (PDF). Kolkata, Kinda: Director, Zool. Surv. India, Kolkata. pp. 14–15.
  6. OCLC 44131774
    .
  7. ^ "Gigantorhynchus Hamann, 1892". www.itis.gov. Integrated Taxonomic Information System (ITIS). 1 September 2019. Retrieved 1 September 2019.
  8. doi:10.5962/bhl.title.46846
    .
  9. ^ a b c Diaz Ungría, C. D. (1958). "Sobre algunos Acantocefalos de Mammiferos venezolanos". Reviews in Veterinary Medicine and Parasitology. 17: 191–204.
  10. JSTOR 3272464
    .
  11. doi:10.1139/cjr39d-025
    .
  12. ^
    CiteSeerX 10.1.1.676.5918
    .
  13. ^ Machado Filho, D. A. (1941). "Sobre alguns acantocéfalos provenientes do estado de Mato Grosso". Revista Brasileira de Biologia (in Portuguese). 1 (1): 57–61.
  14. ^
    JSTOR 3273894
    . Retrieved 25 January 2020.
  15. ^ Tantaleán, Manuel; Díaz, Mónica; Sánchez, Nofre; Portocarrero, Harold (2010). "Endoparásitos de micromamíferos del noroeste de Perú. 1: helmintos de marsupiales". Revista peruana de biología (in Spanish). 17 (2): 207–213.
  16. ^ Thatcher, V. E.; Nickol, B. B. (1972). "Some acanthocephalans from Panama and Colombia" (PDF). Proceedings of the Helminthological Society of Washington. 39: 245–248. Retrieved 25 January 2020.
  17. ^
    PMID 6006728
    .
  18. ^ a b c d Antonio, H (1958). "Descripción de una nueva especie del género Gigantorhynchus Hamann, 1892 (Acanthocephala)". Acta Biologica Venezuelica (in Spanish). 2 (24): 291–298.
  19. ^ Tantaleán, Manuel; Sánchez, Lidia; Gómez, Luis; Huiza, Alina (2005). "Acanthocephalan from Peru". Revista peruana de biología (in Spanish). 12 (1): 83–92. Retrieved 25 January 2020.

Category:Acanthocephalans

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