482:
420:
308:, Mexico. The body is small, stout, ventrally curved; small cylindrical proboscis armed with 16 alternating vertical rows of four or five hooks; anterior two or three hooks are conspicuous, stout and larger than other hooks, and have large, rod-shaped roots with a markedly and abruptly enlarged base; three posterior hooks of each row are smaller and rootless; single-walled proboscis receptacle; lemnisci equal in length, elongate and robust; and cement gland syncytial, larger than testis.
379:
with about eight hooks each. The last two or three rows are smaller but with more hooks with the last row having about 16, which are about half the size of anterior hooks. The hooks are U-shaped, with broad, bluntly rounded roots and slender sharp points, with only the tips projecting through the cuticle. Measured from top of bend both points and roots about 18um to 19um long in hooks at the anterior end of the proboscis and only 9um to l0um long for the hooks of the posterior row.
48:
563:
391:
behind the testes and roughly the same in size. The cement reservoir is bag-shaped and located just behind cement gland. The seminal vesicle is rounded, dorsal to anterior end of cement reservoir, and connected with genital aperture by two ducts. In the female, the eggs in uterus are 27um to 30um long and 12um to 13um wide.
455:
or juvenile state of an
Acanthocephalan, differing from the adult only in size and stage of sexual development. The cystacanths within the intermediate hosts are consumed by the definitive host, usually attaching to the walls of the intestines, and as adults they reproduce sexually in the intestines.
382:
Behind the proboscis, the body tapers posteriorly until it is bluntly rounded with the maximum diameter behind middle of body. The body contains a proboscis sac about twice length of the proboscis. The retractor muscles of the proboscis sac are long and slender and attached behind the middle of body,
390:
in this species with the females up to 6.5 mm in length, with maximum diameter about 0.63 mm and the males up to 4.5 long, with maximum diameter of 0.6 mm. The testes (300um to 400m long and about two-thirds as wide) are in the posterior half of body and contiguous. Syncytial cement glands are just
378:
The proboscis is very small and nearly cylindrical, but slightly expanded distally, about 0.15 mm long and 0.06 mm in diameter. The proboscis is covered in hooks arranged irregularly in about eight diagonally transverse rows. The first four or five rows occupy the anterior two-thirds of proboscis,
243:
covered in very irregularly arranged hooks and a trunk. The proboscis is very small and armed with about eight diagonally transverse rows of hooks with about eight hooks in anterior rows, and about twice as many hooks that are half as large in the posterior rows. The hooks are U-shaped, with large
595:
Salgado-Maldonado, Guillermo & Aguilar-Aguilar, Rogelio & Cabañas-Carranza, Guillermina. (2005). Atactorhynchus duranguensis n. sp (Acanthocephala : Atactorhynchinae) from
Cyprinodon meeki (Pisces : Cyprinodontidae) near Durango, Mexico. Systematic parasitology. 60. 205-9.
324:
where the trunk is widest posteriorly, and the proportion of large apical proboscis hooks in relation to the small basal hooks is different: the basal hooks of A. verecundus are about half the size of the anterior hooks and but only about a quarter of the size in
247:
The body is small, stout, ventrally curved, with greatest diameter behind the middle. The retractor muscles for the proboscis sac are attached behind middle of body. The
383:
so that the anterior end of body can be retracted. The lemnisci are long (about half length of body) and in males terminate at about anterior margin of anterior testis.
333:, the base of the roots are markedly and abruptly enlarged in the new species. Finally, the eggs of the new species are smaller (23-27 x 8-10 um) than those of
814:
427:
The life cycle of an acanthocephalan consists of three stages beginning when an infective acanthor (development of an egg) is released from the intestines of the
840:
320:
is also shaped differently: it has a proboscis shape that is not widest at the apex, and the greatest width of the trunk is in about the middle contrasting
801:
827:
244:
rod-shaped roots and slender spines with only the tips projecting through the cuticle. The proboscis sac is about twice as long as the proboscis.
215:(which has a large and long proboscis with 20 or more transverse rows of large hooks and a body that is cylindrical or enlarged anteriorly) and
558:
619:
866:
557:
Chandler, A.C. (1935). Parasites of fishes in
Galveston Bay. Proceedings of the United States National Museum. 83(2977):123-157.
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894:
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or the intestine of the intermediate host and growing. The final stage is the infective cystacanth which is the
263:, are in contact with testes. There is a seminal vesicle with two ducts and a well-developed cement reservoir.
221:(which has a short cylindrical proboscis with hooks that are not U-shaped but bent at right angles, very short
201:
The genus was described by
Chandler in 1935 who gave it a new genus as it was the only genera in the family
251:
are very long and large, extending about to middle of body, one containing one nucleus, the other two. The
730:
767:
559:
https://repository.si.edu/bitstream/handle/10088/16105/USNMP-83_2977_1935.pdf?sequence=1&isAllowed=y
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222:
202:
109:
447:, the second stage called the acanthella begins. This stage involves penetrating the wall of the
99:
42:
464:(hosts where parasites infest but do not undergo larval development or sexual reproduction) for
693:
Schmidt, G.D. (1985). "Development and life cycles". In
Crompton, D.W.T.; Nickol, B.B. (eds.).
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185:(thorny-headed worms, also known as spiny-headed worms) which contains two species,
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132:
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217:
753:
694:
580:
https://pdfs.semanticscholar.org/f1a5/47122f84eb2e637a42dded5570623b79e451.pdf
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440:
259:, which are used to temporarily close the posterior end of the female after
240:
225:, and short retractor muscles). Phylogenetic analysis has been performed on
206:
59:
679:
747:
661:
645:
806:
646:"Human Acanthocephaliasis: a Thorn in the Side of Parasite Diagnostics"
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305:
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was found in the intestines of about 30 to 40 percent of the sampled
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CDC’s
Division of Parasitic Diseases and Malaria (11 April 2019).
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This article incorporates text from this source, which is in the
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are large, more or less spherical ad contiguous. The syncytial
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infesting humans in the
English language medical literature.
288:
Salgado-Maldonado, Aguilar-Aguilar and Cabañas-Carranza, 2005
460:
of the definitive host and the cycle repeats. There may be
316:
with smaller hook lengths and slightly smaller proboscis.
403:
is determined by that of its hosts. They were found in
702:. Cambridge: Cambridge Univ. Press. pp. 273–305.
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parasitizes animals. There are no reported cases of
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with more than four horizontal rows of hooks on the
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510:There are no known aberrant human infections for
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367:in very large numbers in some hosts. Very few
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431:and then ingested by an arthropod, the
296:has been found in the intestine of the
435:. Although the intermediate hosts of
7:
371:were found from hosts sampled near
644:Mathison, BA; et al. (2021).
439:are not known, they are always an
25:
709:from the original on 22 July 2023
622:from the original on 8 June 2023
561:
46:
456:The acanthor is passed in the
1:
696:Biology of the Acanthocephala
423:Life cycle of Acanthocephala.
284:Atactorhynchus duranguensis
163:Atactorhynchus duranguensis
916:
616:Center for Disease Control
596:10.1007/s11230-004-6349-3.
343:Atactorhynchus verecundus
337:(27-30 x 12-13 um).
159:
151:
141:Atactorhynchus verecundus
138:
131:
43:Scientific classification
41:
34:
18:Atactorhynchus verecundus
27:Genus of parasitic worms
900:Taxa described in 1935
494:
424:
278:contains two species.
484:
422:
361:Cyprinodon variegatus
239:species consist of a
662:10.1128/JCM.02691-20
608:"Acanthocephaliasis"
443:. When the acanthor
399:The distribution of
363:) in upper parts of
304:) from in-land near
895:Neoechinorhynchidae
203:Neoechinorhynchidae
110:Neoechinorhynchidae
495:
425:
100:Neoechinorhynchida
882:
881:
854:Open Tree of Life
731:Taxon identifiers
656:(11): e02691-20.
487:Sheepshead minnow
433:intermediate host
407:and in-land near
388:sexual dimorphism
357:Sheepshead minnow
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298:Mezquital pupfish
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16:(Redirected from
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373:Galveston Island
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312:is smaller than
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462:paratenic hosts
429:definitive host
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327:A. duranguensis
318:A. duranguensis
310:A. duranguensis
294:A. duranguensis
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227:A. duranguensis
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191:A. duranguensis
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512:Atactorhynchus
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489:is a host for
476:Atactorhynchus
472:Atactorhynchus
466:Atactorhynchus
437:Atactorhynchus
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401:Atactorhynchus
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347:Chandler, 1935
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276:Chandler, 1935
273:Atactorhynchus
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237:Atactorhynchus
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183:Acanthocephala
174:Atactorhynchus
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146:Chandler, 1935
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395:Distribution
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133:Type species
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612:www.cdc.gov
232:Description
218:Pandosentis
209:apart from
889:Categories
522:References
449:mesenteron
271:The genus
261:copulation
441:arthropod
386:There is
329:. Unlike
241:proboscis
207:proboscis
66:Kingdom:
60:Eukaryota
754:Q1858854
748:Wikidata
704:Archived
680:34076470
620:Archived
514:species.
249:lemnisci
223:lemnisci
197:Taxonomy
106:Family:
76:Phylum:
70:Animalia
56:Domain:
859:4951408
846:1915325
820:1290266
807:2500972
713:16 July
671:8525584
626:17 July
409:Durango
306:Durango
267:Species
154:species
116:Genus:
96:Order:
86:Class:
872:159683
833:198226
768:938870
678:
668:
453:larval
253:testes
152:Other
867:WoRMS
815:IRMNG
794:52848
707:(PDF)
700:(PDF)
498:Notes
458:feces
445:molts
415:Hosts
179:genus
177:is a
841:NCBI
828:ITIS
802:GBIF
781:34T4
763:BOLD
715:2023
676:PMID
628:2023
485:The
189:and
789:EoL
776:CoL
666:PMC
658:doi
181:in
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Text is available under the Creative Commons Attribution-ShareAlike License. Additional terms may apply.
