Centrorhynchus conspectus Van Cleave et Pratt, 1940

Lisitsyna, O. I. & Greben, O. B., 2015, Acanthocephalans Of The Genus Centrorhynchus (Palaeacanthocephala, Centrorhynchydae) From Birds Of Ukraine With The Description Of A New Species, Vestnik Zoologii 49 (3), pp. 195-210 : 199-201

Centrorhynchus conspectus Van Cleave et Pratt, 1940

( fig. 2 , A–D)

Syn. C. wardae Holloway, 1958 .

G e n e r a l (2 {, 4}). Trunk elongate, almost cylindrical. Proboscis divided into 2 parts by constriction at level of receptacle attachment. Anterior proboscis part spatulate or spherical, posterior proboscis part conical. Neck short. Proboscis with 30–32 longitudinal rows of 16–18 (17) hooks. First 4–6 (5) hooks large with posteriorly directed strong roots. Next 3–4 hooks transitional, with roots consisting of 2 antero–lateral alate processes, remaining hooks spiniform with simple roots directed anteriorly. Length of blade increasing from first to third, then gradually decreasing, blade of transitional hooks smallest. Roots increasing from first to 4–5th, roots of transitional hooks smallest. Proboscis receptacle double-walled, attach in middle proboscis, formed constriction. Lemnisci sacciform, longer than proboscis receptacle. Gonopore subterminal in both sexes.

1 Data of literature.

2 Material of the collection.

Рис. 2. Centrorhynchus conspectus от Bubo bubo : A — хоботок, {; B — крючья продольного ряда, {; C — яйцо; D— терминальная часть половой системы самки.

M a l e s. Trunk 16.00–23.10 mm long, with maximum width in testis region 970– 1100. Proboscis 800–880 long with maximum width in anterior part 400, anterior part of proboscis up to constriction 470 long with width at constriction 360–380. Proboscis with 30–31 longitudinal rows of 16–17 hooks. First 4–6 (5) hooks large with strong roots directed posteriorly. Hook blade length: 1, 40–50; 2, 50–55; 3, 60–63; 4, 50–53. Hook blade thickness: 1, 7–12; 2, 10–18; 3, 18–25; 4, 10–25; 5, 10–18. Hook root length: 1, 35–38; 2, 40; 3, 43–45; 4, 45–65; 5, 50; 6, 35–50. Transitional hook blade length 33–40, 8–10 thick, hook root 38–40 long. Spiniform hook blade length 33–38, hook root processes 20–25 long. Proboscis receptacle 1310–1580 long with maximum width 350–400. Neck short, 40–110 long. Lemnisci extended behind proboscis receptacle, but not up anterior testis. Lemnisci 1690–2980 long. Testes in tandem slightly overlapping one another at a distance 430–680 from bottom of proboscis receptacle. First testis 890–1020 × 500–600, second testis 93–95 × 500–600. Cement glands 9.47 mm long. Säfftigen pouch 2.23 mm long.

F e m a l e s. Trunk 28.00–30.00 mm long, with maximum width in anterior part 1100–1400. Proboscis 800–1000 long with maximum width in anterior part 400–430, anterior part of proboscis up to constriction 470–550 long with width at constriction 350–380. Proboscis with 30–32 longitudinal rows of 16–18 hooks. First 4–5 (4.6) hooks large with strong roots directed posteriorly. Hook blade length: 1, 53; 2, 55–65; 3, 50– 64; 4, 48–58; 5, 33–55. Hook blade thickness: 1, 12–13; 2, 15–18; 3, 18–22; 4, 20–25; 5, 15–23. Hook root length: 1, 30–43; 2, 50–55; 3, 50–60; 4, 60–70; 5, 33–58. Transitional hook blade length 38–43, 12–13 thick, hook root 20–28 long. Spiniform hook blade length 33–43, hook root processes 20–25 long. Proboscis receptacle 1200–1600 long with maximum width 340–400. Neck short, 40–90 long. Lemnisci 1350–1420 long. Reproductive tract 2300–2550 long, consist of vagina with two sphincters, uterus and uterine ball. Eggs elongate-oval, without polar prolongation of fertilization membrane, 68–72 × 33–35.

R e m a r k s. The species was described from barred owl Strix varia Barton, 1799 in North America ( Van Cleave, Pratt, 1940). Our material corresponds to the first description ( Van Cleave et Pratt, 1940).

It is recorded from the birds of the genera Strix , Aquila , Otus , Athene , Asio in the Volga region and Asia ( Turkmenistan, Tajikistan). It is found in Ukraine in hen harrier Circus cyaneus 2, eagle-owl Bubo bubo 2 in Donetsk Region (Strilzovska Step Reserve) ( Lisitsyna, 1993).

Figures

Fig. 2. Centrorhynchus conspectus from Bubo bubo: A — proboscis, {; B — hooks of a longitudinal row, {; C — egg; D — terminal part of female reproductive system.