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Anatomical measurements
Measurements (Female/Male) Length of proboscis Width of proboscis Length of proboscis receptacle Width of proboscis receptacle Length of trunk (mm) Width of trunk (mm) Length of small rootless spines Length of lemnisci Size of eggs (um) Size of anterior/posterior testis (mm)
M. africanus 4.00-110.00
3.0-74.0
0.60-4.00
0.5-2.80
65-86x39-52 0.37-4.10x0.30-1.10
?x0.32-3.15
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Name Taxonomy Host(s) and Range Description
Mediorhynchus africanus
Amin, Evans, Heckmann and El-Naggar, 2013[1]
The species name africanus is named for the worm's distribution across sub-Saharan Africa.[1] It is synonymous with Empodius segmentatus (de Marval, 1902) Southwell et MacFie, 1925 and Mediorhynchus selengensis Harris 1973.[2] The trunk is pseudosegmented, flattened laterally, has many prevalent sensory pits. There is marked sexual dimorphism with the female being much larger. There are up to 100 annuli (structures that permits shortening and lengthening of the body by telescoping) in females but fewer in the shorter males. The proboscis is divided by a prominent ridge into two parts: anterior and posterior. The anterior proboscis is pear or apple-shaped with a truncated bare apical end measuring 250 to 339 long by 278 to 478 wide in the male and 300 to 438 long by 330 to 510 wide in the female. The anterior proboscis has two prominent apical pores and 18 to 22 longitudinal rows of 4 to 6 hooks each. The hooks posteriorly directed and measure between 35 and 76 long with the smallest found anteriorly and the longest in the middle. The posterior proboscis is conically shaped and measures 291 to 332 long by 591 to 689 wide at junction with anterior trunk in the male, and 323 to 365 long by 99 to 745 wide at junction with anterior trunk in the female. Except for the posterior most end, the posterior proboscis is covered in very thin spines that are curved posteriorly or undulating with a total of 26 to 40 longitudinal rows of 2 to 6 spines each measuring 14 to 43 long with the longest spines found anteriorly. The Proboscis receptacle is single-walled with anterior portion encased in jacket of adjacent retractor fibers and measures 0.64 to 1.23 mm long by 0.11 to 0.44 mm wide in the male and 0.64 to 1.80 mm long by 0.11 to 0.55 mm wide in the female. The proboscis retractor muscles are prominent and attached to the proboscis receptacle near its posterior end dorsally. The lemnisci long, digitiform, unequal, and unattached. The shorter lemniscus measure between 1.60 and 3.38 mm long by 0.21 and 0.31 mm wide, with 5 or 6 giant nuclei in the male and measure 1.60 to 5.50 mm long by 0.19 to 0.33 mm wide, with 5 or 6 giant nuclei in the female. Longer lemniscus measures 2.15 to 3.47 mm long by 0.21 to 0.33 mm wide with 6, occasionally 7, giant nuclei in the male and measures 2.12 to 7.31 mm long by 0.19 to 0.62 mm wide with 6 giant nuclei in the female. The male reproductive system is located in the posterior third of trunk and consists of two oblong testes. There are eight clustered cement glands larger anteriorly, each with one large central giant nucleus and with independent cement ducts emptying at posterior end of Saefftigen’s pouch, along with prominent common sperm duct. The male gonopore is terminal. The female reproductive system is short and located in the broad and flat posterior end of trunk. The uterine bell contains many large nucleated cells with its dorsal and ventral anterior ends connected to body wall with filaments. The gonopore is sub-ventral occasionally covered by a looping posterior trunk expansion.[1]
The Yellow-necked spurfowl (Pternistis leucoscepus) is found in Kenya
Helmeted guineafowl walking in a field
The Helmeted guineafowl is found in Kruger National Park (South Africa), Morocco, Nigeria and Burkina Faso
The trunk is pseudosegmented, flattened laterally, has many prevalent sensory pits, and measures 3.0 to 74.0 mm long by 0.5 to 2.80 mm wide in the male and measures between 4.00 and 110.00 mm long by 0.60 and 4.00 mm wide in the much larger female. There are up to 100 annuli (structures that permits shortening and lengthening of the body by telescoping) in females but fewer in the shorter males. The proboscis is divided by a prominent ridge into two parts: anterior and posterior. The anterior proboscis is pear or apple-shaped with a truncated bare apical end measuring 250 to 339 long by 278 to 478 wide in the male and 300 to 438 long by 330 to 510 wide in the female. The anterior proboscis has two prominent apical pores and 18 to 22 longitudinal rows of 4 to 6 hooks each. The hooks posteriorly directed and measure between 35 and 76 long with the smallest found anteriorly and the longest in the middle. The posterior proboscis is conically shaped and measures 291 to 332 long by 591 to 689 wide at junction with anterior trunk in the male, and 323 to 365 long by 99 to 745 wide at junction with anterior trunk in the female. Except for the posterior most end, the posterior proboscis is covered in very thin spines that are curved posteriorly or undulating with a total of 26 to 40 longitudinal rows of 2 to 6 spines each measuring 14 to 43 long with the longest spines found anteriorly. The Proboscis receptacle is single-walled with anterior portion encased in jacket of adjacent retractor fibers and measures 0.64 to 1.23 mm long by 0.11 to 0.44 mm wide in the male and 0.64 to 1.80 mm long by 0.11 to 0.55 mm wide in the female. The proboscis retractor muscles are prominent and attached to the proboscis receptacle near its posterior end dorsally. The lemnisci long, digitiform, unequal, and unattached. The shorter lemniscus measure between 1.60 and 3.38 mm long by 0.21 and 0.31 mm wide, with 5 or 6 giant nuclei in the male and measure 1.60 to 5.50 mm long by 0.19 to 0.33 mm wide, with 5 or 6 giant nuclei in the female. Longer lemniscus measures 2.15 to 3.47 mm long by 0.21 to 0.33 mm wide with 6, occasionally 7, giant nuclei in the male and measures 2.12 to 7.31 mm long by 0.19 to 0.62 mm wide with 6 giant nuclei in the female. The male reproductive system is located in the posterior third of trunk and consists of two oblong testes measuring Anterior testis measure 0.37 to 4.10 mm long by 0.30 to 1.10 mm wide and the posterior testis measure 0.32 to 3.15 mm wide. There are eight clustered cement glands larger anteriorly, each with one large central giant nucleus and with independent cement ducts emptying at posterior end of Saefftigen’s pouch, along with prominent common sperm duct. The male gonopore is terminal. The female reproductive system is short and located in the broad and flat posterior end of trunk. The uterine bell contains many large nucleated cells with its dorsal and ventral anterior ends connected to body wall with filaments. The gonopore is sub-ventral occasionally covered by a looping posterior trunk expansion. The eggs are ovoid being 65 to 86 long by 39 to 52 wide.[1]
Mediorhynchus alecturae
(Johnston and Edmonds, 1947)[a]
An Australian brushturkey on grass
The Australian brushturkey is a host of M. alecturae
Queensland, Australia
Type locality: Eidsvold
Mediorhynchus cambellensis
Soota, Srivastava and Ghosh, 1969
Mediorhynchus centurorum
Nickol, 1969
Mediorhynchus channapettae
George and Nadakal, 1984
Mediorhynchus cisticolae
Smales, 2011
A red-faced cisticola on a piece of wood.
The Red-faced cisticola is a host of M. cisticolae
Mediorhynchus colluricinclae
Smales, 2002
Mediorhynchus conirostris
Ward, 1966
Mediorhynchus corcoracis
Johnston and Edmonds, 1950[3]
White-winged chough (Corcorax melanorhamphos)
The little crow (Corvus bennetti)
The Australian raven (Corvus coronoides)
The little raven (Corvus mellori)
Australian magpie lark (Grallina cyanolenca)[4]
New South Wales, Queensland, Victoria, and South Australia
South Australia
South Australia
Victoria and South Australia
south Australia and the northern territory[4]
It is named after the genus name of a host species Corcorax.[3]
Mediorhynchus edmondsi
Schmidt and Kuntz, 1977
Mediorhynchus emberizae
(Rudolphi, 1819)
Mediorhynchus empodius
(Skrjabin, 1913)
Mediorhynchus fatimaae
Khan, Bilqees and Muti-ur-Rehman, 2004
A white-eyed buzzard on a tree branch
The White-eyed buzzard is a host of M. fatimaae
Mediorhynchus gallinarum
(Bhalerao, 1937)
Mediorhynchus gibsoni
Bilqees, Khan, Khatoon and Khatoon, 2007
Mediorhynchus giganteus
Meyer, 1931
Mediorhynchus grandis
Van Cleave, 1916
Mediorhynchus indicus
Varghese-George, Mathai-Nadakal, Kunjanpillai-Vijayakumaran and Rajendran, 1981
Mediorhynchus kuntzi
Ward, 1960
Mediorhynchus lagodekhiensis
Kuraschvili, 1955
Mediorhynchus leptis
Ward, 1966
Mediorhynchus lophurae
Wang, 1966
Mediorhynchus mariae
George and Nadakal, 1984
Mediorhynchus mattei
Marchand and Vassiliades, 1982
A northern red-billed hornbill walking on grass
The northern red-billed hornbill is the type-host of M. mattei
Mediorhynchus meiringi
Bisseru, 1960
Mediorhynchus micracanthus
(Rudolphi, 1819)
Mediorhynchus mirabilis
(de Marval, 1905)
Mediorhynchus murtensis
Lundström, 1942
Mediorhynchus nickoli
Khan, Bilqees and Muti-ur-Rehman, 2004
A black kite (bird) sitting on a metal wire
The Black kite is a host of M. nickoli
Mediorhynchus numidae
(Baer, 1925)
Mediorhynchus orientalis
Belopolskaya, 1953
Mediorhynchus oswaldocruzi
Travassos, 1923
Mediorhynchus otidis
(Miescher, 1841)
Mediorhynchus pandei
Bhattacharya, 2007
Mediorhynchus papillosus
Van Cleave, 1916
Mediorhynchus passerus
Das, 1951
Mediorhynchus pauciuncinatus
Dollfus, 1959
Mediorhynchus peckeri
Bhattacharya, 1999
Mediorhynchus peruensis
Moya, Martinez and Tantalean, 2011
Mediorhynchus petrochenkoi
Gvosdev and Soboleva, 1966
Mediorhynchus pintoi
Travassos, 1923
Mediorhynchus quilonensis
Bhattacharya, 2007
Mediorhynchus rajasthanensis
Gupta, 1976
Mediorhynchus robustus
Van Cleave, 1916
A Yellow-breasted chat on a branch
The Yellow-breasted chat is a host of M. robustus
Mediorhynchus rodensis
Cosin, 1971
A Eurasian jay on a branch
The Eurasian jay is one of the hosts of M. rodensis
Mediorhynchus sipocotensis
Tubangui, 1935
Mediorhynchus spinaepaucitas
Smales, 2011
A Yellow-throated longclaw walking on the ground
The Yellow-throated longclaw is a host of M. spinaepaucitas
Mediorhynchus taeniatus
(von Linstow, 1901)
An African pied hornbill on a tree branch
The African pied hornbill is a host of M. taeniatus

A Southern Yellow-billed Hornbill on a tree branch near the ground
The Southern Yellow-billed Hornbill is a host of M. taeniatus
Mediorhynchus tanagrae
(Rudolphi, 1819)
Mediorhynchus tenuis
Meyer, 1931
A Common rock thrush on a branch
The Common rock thrush is one of the hosts of M. tenuis
Mediorhynchus textori
Barus, Six and Majumdar, 1978
Mediorhynchus thrushi
Bhattacharya, 2000
Mediorhynchus turdi
Smales, 2011
Mediorhynchus turnixena
(Tubangui, 1931)
Mediorhynchus vaginatus
(Diesing, 1851)
Mediorhynchus vancleavei
(Lundström, 1942)
Mediorhynchus wardi
Schmidt and Canaris, 1967
Mediorhynchus zosteropis
(Porta, 1913)
A Hooded crow thrush on a branch
The Hooded crow is one of the hosts of M. zosteropis
Vratsa in the Vrachanska Planina mountains of Bulgaria and generally distributed in New Caledonia and the Palaearctic.[5] It is also reported in the Muscicapidae Diaphanopterus naevius similimus and the silvereye (Zosterops lateralis) in New Caledonia.[6]
  1. ^ a b c d Amin, Omar M.; Evans, Paul; Heckmann, Richard A.; El-Naggar, Atif M. (2013). "The description of Mediorhynchus africanus n. sp. (Acanthocephala: Gigantorhynchidae) from galliform birds in Africa". Parasitology Research. 112 (8): 2897–2906. doi:10.1007/s00436-013-3461-9. PMID 23722716. S2CID 5952065.
  2. ^ Cite error: The named reference Amin2013 was invoked but never defined (see the help page).
  3. ^ a b Johnston & Edmonds, 1950 : Australian Acanthocephala n° 8. Transactions of the Royal Society of South Australia, vol.74, p.1–5 url=https://www.biodiversitylibrary.org/item/128927#page/5/mode/1up.
  4. ^ a b Cite error: The named reference smales2002 was invoked but never defined (see the help page).
  5. ^ Cite error: The named reference Bechev was invoked but never defined (see the help page).
  6. ^ Cite error: The named reference Golvan1960 was invoked but never defined (see the help page).


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