Observations on a cucullanid nematode of marine fishes from Taiwan Strait, Dichelyne (Cucullanellus) jialaris n. sp.
During a helminthological examination of marine fishes from south of the Minnan-Taiwan Bank Fishing Ground, Taiwan Strait, Fujian, China, a new cucullanid nematode, Dichelyne (Cucullanellus) jialaris n. sp., was removed from the intestine of the red seabream, Pagrus major (Temminck & Schlegel, 1834). The new species differs from its congeners mainly in the following characters: body size medium but with relative long spicules of 1.01 mm (0.97-1.06) in length or 20.0% (18.21-21.8%) of the body length; proximal end of spicules somewhat expanded and distal end rounded; gubernaculum I-shaped, slightly narrow in the middle part, both ends rounded; both anterior and posterior cloaca lips round or oval, prominent and unequal in size. The anterior cloaca lip is at least 2 times larger than the posterior one. There is a conspicuous papilliform structure within the central of anterior and posterior cloacal lip. Vulva of female is not prominent, slightly postequatorial; distance from vulva to anterior end of body is 4.3 (3.0-5.5) mm or 58.0% (54.0-62.0%) of the body length. Considering the result of comparing the structure of so-called unpaired median papilla with the 10 pairs of caudal petiolated papillae in the body of the same individual. the papilliform structures are just a backstop for the cloacal lips, this new species represents the first record of a nematode of the Dichelyne, subgenus Cucullanellus in marine fishes of China Sea.
School of Life Sciences, Xiamen University, Xiamen, Fujian 361005, People's Republic of China. dmluo@jingxian.xmu.edu.cn
Damin
D
Luo
Shulin
S
Guo
Wenzhen
W
Fang
Heqin
H
Huang
D000818:Animals; D005260:Female; D005393:Fish Diseases / Q000469:parasitology*; D008297:Male; D009348:Nematoda / Q000033:anatomy & histology / Q000145:classification*; D009349:Nematode Infections / Q000469:parasitology / Q000662:veterinary*; D021541:Sea Bream / Q000469:parasitology*; D012623:Seawater; D013624:Taiwan