Centrorhynchus spinosus (Kaiser, 1893) Van Cleave, 1924

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 : 204-205

Centrorhynchus spinosus (Kaiser, 1893) Van Cleave, 1924

fig. 4 , A–E)

Syn. Echinorhynchus spinosus Kaiser, 1893 ; Centrorhynchus spinosus Van Cleave, 1916 ; Centrorhynchus sp. : Смогоржевская, 1954, 1964, 1976.

G e n e r a l (4 {, 3}). Trunk long, narrow to anterior and posterior parts, maximal width in middle. Pro boscis with evident winding before constricrtion. Neck implict. Proboscis with 30–36 longitudinal rows of 20–23 hooks. First 8–10 hooks large with posteriorly directed strong roots. Roots 2–6 hooks with anterior processes. Largest hooks with blades and roots approximately same lengh. Next 3–5 hooks transitional, with composite scutiform processes, bifurcated in anterior part. Remainder hooks spiniform with simple root processes or without them. Proboscis receptacle double-walled, cylindrical, attach in middle proboscis. Lemnisci sacciform, longer than proboscis receptacle. Gonopore subterminal in both sexes.

M a l e s. Trunk 15.7–16.00 mm long, with maximum width in posterior part of lemnisces 1760–2000. Proboscis 1100–1160 long with maximum width in anterior part 400, anterior part of proboscis up to level of attachment of proboscis receptacle 700–780 long with width at attachment 290–350. Proboscis with 34–36 longitudinal rows of 20–22 hooks. First 8–9 hooks large with strong roots directed posteriorly. Largest hook blade length: 1, 50–58; 2, 58–60; 3, 58; 4, 58; 5, 53–55; 6, 43–53; 7, 40–48; 8, 40–45; 9, 30–38. Hook blade thickness: 1, 7; 2, 10; 3, 6 –12; 7, 9 –15. Hook root length: 1, 32–43; 2, 50–55; 3, 53–60; 4, 50– 60; 5, 48–55; 6, 50–55; 7, 50–55; 8, 55–60; 9, 37–63. Transitional hook blade length 5–38, 7–10 thick, roots 25–28 long. Remainder hook blade length 30–40, hook root processes 15–25 long. Proboscis receptacle 1160–1620 long with maximal width 400–500. Lemnisci 2400–2410 long, fall short of testes. Testes in tandem slightly overlapping one another. First testis 1030 × 610, second testis 1110 × 600. Cement glands 7.20–10.00 mm long. Säfftigen pouch 1920–2000 long.

F e m a l e s. Trunk 28.00–30.00 mm long, with maximum width in posterior part of lemnisces 1700–2000. Proboscis 900–1100 long with maximum width in anterior part 350–390, anterior part of proboscis up to level of attachment of proboscis receptacle 610–720 long with width at attachment 280–330. Proboscis with 30–34 longitudinal rows of 22–23 hooks. First 9–10 hooks large with posteriorly directed strong roots. Their hook blade length: 1, 45–53; 2, 50–53; 3, 50–53; 4, 48–50; 5, 45–48; 6, 45–45; 7, 43–45; 8, 39–43; 9, 38–42; 10, 35. Hook blade thickness increasing from first hook (7) to 9th (17), and decreasing from 15 in 9–10 to 7–10 in basal hooks. Hook root length: 1, 38–48; 2, 40–50; 3, 50; 4, 50; 5, 48–53; 6, 48–53; 7, 45–53; 8, 50–55; 9, 45–53; 10, 45–53. Transitional hook blade length 35–38, roots 20–25 long. Remainder hook blade length 38–43, hook root processes 20–25 long. Proboscis receptacle 1480–1770 long. Eggs elongate-oval, without polar prolongation of fertilization membrane, 50– 53 (56.1) × 25–27.

R e m a r k s. The species was reported from glossy ibis Plegadis falcinellus and blackcrowned night heron Nycticorax nycticorax in the vicinity of the Black Sea Reserve in Kherson Region ( Lisitsyna, 1993, 2008). Later, a single specimen from Nycticorax nycticorax was assigned to C. amphibius ( Kornyushin et al., 2004) . Re-exami-nation of this specimen and its comparison with the original description of C. amphibius ( Das, 1950) showed that the shape of the proboscis with the extension of the anterior part, the proboscis armament (more than 30 longitudinal rows of hooks vs 26–30 in C. amphibius ), and the number of large hooks with developed roots in longitudinal rows (9 vs 5 in C. amphibius ) do not correspond to C. amphibius . At the same time, the morphology of the specimen is fully consistent with the description of C. spinosus .

The species was described from the birds of prey in North America. It is recorded from the birds of the genera Strix , Circus , Elanoides , Herodias in Europe, Asia and North. America. It is found in Ukraine in black-crownedon Nycticorax nycticorax 2, glossy ibis Plegadis falcinellus 2, common buzzard Buteo buteo 2, western marsh harrier Circus aeruginosus 2, common kestrel Falco tinnunculus 2 in Volyn Region (West Polissya), Odesa Region (Vylkove), Kyiv Region (Zazimye), Kherson Region (area Black Sea Reserve and Sofiyivka) ( Khohlova, 1986 2; Lisitsyna, 1993, 2008; Kornyushin et al., 2004).

Figures

Fig. 4.Centrorhynchus spinosus from Falco tinnunculus: A — proboscis, {; B — hooks of a longitudinal row, {; C — egg; D — hooks of a longitudinal row, {.