Hysterothylacium simile n. sp. and H. aduncum (Rudolphi, 1802) (Nematoda: Raphidascarididae) from marine fishes in the B
- PDF / 1,177,573 Bytes
- 13 Pages / 547.087 x 737.008 pts Page_size
- 43 Downloads / 185 Views
Hysterothylacium simile n. sp. and H. aduncum (Rudolphi, 1802) (Nematoda: Raphidascarididae) from marine fishes in the Bohai and Yellow Sea, China, with comments on the record of H. paralichthydis (Yamaguti, 1941) from Chinese waters Liang Li • Lu-Ping Zhang • Yuan-Yuan Liu Received: 16 July 2012 / Accepted: 24 August 2012 Ó Springer Science+Business Media Dordrecht 2012
Abstract Hysterothylacium simile n. sp., collected from the Japanese seabass Lateolabrax japonicus (Cuvier) (Perciformes: Lateolabracidae) in the Bohai Sea off China, is described using both light and scanning electron microscopy. The new species differs from its congeners in the presence of narrow lateral alae originating a short distance posterior to the base of the ventrolateral lips, a long intestinal caecum (60.4–79.1% of oesophageal length) and a relatively short ventricular appendix (intestinal caecum to ventricular appendix ratio 1:0.58–0.85), long spicules (2.11–2.99 mm, 4.25–7.83% of body length), the number and arrangement of the caudal papillae (32–36 pairs arranged as follows: 27–31 pairs precloacal, 1 pair paracloacal, and 4–5 pairs postcloacal with the second or third pair double) and the presence of a particular midventral precloacal papilla. Specimens originally identified as Contracaecum paralichthydis Yamaguti, 1941 [now H. paralichthydis (Yamaguti, 1941)] by Xu¨ (1957), collected from the yellow striped flounder Pseudopleuronectes herzensteini (Jordan & Snyder) (Pleuronectiformes: Pleuronectidae) in the Yellow Sea off China, were also re-examined. Their morphology clearly revealed they belong to H. aduncum (Rudolphi, 1802), which is also redescribed
L. Li (&) L.-P. Zhang Y.-Y. Liu College of Life Science, Hebei Normal University, Shijiazhuang 050024, Hebei Province, People’s Republic of China e-mail: [email protected]
based on Xu¨’s material. In addition, the morphological variation of caudal papillae in H. aduncum from P. herzensteini was compared, using scanning electron microscopy, with specimens collected from another three fish hosts, Lophius litulon (Jordan) (Lophiiformes: Lophiidae), Scomberomorus niphonius (Cuvier) (Perciformes: Scombridae) and Cleisthenes herzensteini (Schmidt) (Pleuronectiformes: Pleuronectidae), from the Yellow Sea off China.
Introduction Species of Hysterothylacium Ward & Magath, 1917 are common parasites of marine, estuarine and freshwater fishes worldwide, and the genus now includes approximately 70 recognisable species (Bruce et al., 1994; Moravec & Nagasawa, 1998, 2000; Torres et al., 1998; Torres & Soto, 2004; Gopar-Merino et al., 2005; Li et al., 2007a, b, 2012; Raffel & Anderson, 2009; Rossin et al., 2011; Knoff et al., 2012). However, in Chinese waters, reports of Hysterothylacium spp. from the marine fish are still limited. Prior to 2012, only 11 species of Hysterothylacium have been reported from Chinese marine fishes, namely H. amoyense (Hsu¨, 1933), H. fabri (Rudolphi, 1819), H. tasmaniense (Johnston & Mawson, 1945), H. marinum (Linnaeus, 1767), H. zenis (Baylis, 1929), H. sin
Data Loading...
