Allogenarchopsis Gen. Nov. (Digenea, Derogenidae, Halipeginae) Parasitic in the Intestine of Freshwater Fishes: a Molecular
Total Page:16
File Type:pdf, Size:1020Kb
Bull. Natl. Mus. Nat. Sci., Ser. A, 39(3), pp. 119–130, August 22, 2013 Allogenarchopsis gen. nov. (Digenea, Derogenidae, Halipeginae) Parasitic in the Intestine of Freshwater Fishes: a Molecular and Morphological Study of Adult and Cercarial Forms Misako Urabe1 and Takeshi Shimazu2 1 Department of Ecosystem Studies, School of Environmental Sciences, The University of Shiga Prefecture, 2500 Hassaka, Hikone, Shiga 522–8533, Japan E-mail: [email protected] 2 10486–2 Hotaka-Ariake, Azumino, Nagano 399–8301, Japan (Received 8 March 2013; accepted 26 June 2013) Abstract Adults of Genarchopsis yaritanago Shimazu et al., 2011 (Digenea, Derogenidae, Hali- peginae) were found in the intestine of Tanakia lanceolata (Temminck and Schlegel, 1846) (type host), Tanakia limbata (Temminck and Schlegel, 1846) (new host record), Rhodeus ocellatus ocellatus (Kner, 1866) (new host record) and Acheilognathus rhombeus (Temminck and Schlegel, 1846) (new host record) (Cyprinidae, Acheilognathinae) from the Lake Biwa basin in Shiga Prefecture, central Japan. Daughter rediae and cercariae of Cercaria problematica Faust, 1924 were found in Semisulcospira reiniana (Brot, 1874) (Gastropoda, Sorbeoconcha, Pleuroceridae) from the same basin. The cytochrome c oxidase subunit I gene (COI) of the mitochondrial DNA of the adult and cercaria was partially sequenced. Morphological and molecular studies showed that G. yaritanago and C. problematica are the same species, that the original description by Shimazu et al. (2011) includes some errors of taxonomic importance at the generic level, and that G. yaritanago should be removed to another genus. Allogenarchopsis gen. nov. (Halipeginae) is proposed. The type species is Allogenarchopsis yaritanago (Shimazu et al., 2011) comb. nov. The species name of the taxon is changed from A. yaritanago to Allogenarchopsis problematica (Faust, 1924) comb. nov. (syn. C. problematica, Cercaria manei Ito, 1960, G. yaritanago, A. yaritanago). The adult, daughter redia and cercaria are described and figured. Key words : Allogenarchopsis problematica (Faust, 1924) comb. nov., Cercaria problematica, Genarchopsis yaritanago, COI sequences, morphology. caria was partially sequenced, and the COI Introduction sequences were phylogenetically analyzed. Shimazu et al. (2011) described a new species, Results suggested that G. yaritanago and C. Genarchopsis yaritanago (Digenea, Derogeni- problematica are the same species; and G. yari- dae, Halipeginae), on the basis of the type series tanago does not belong to Genarchopsis Ozaki, found in the intestine of Tanakia lanceolata 1925 whose type species is Genarchopsis goppo (Temminck and Schlegel, 1846) (Cyprinidae, Ozaki, 1925. Subsequent morphological studies Acheilognathinae) from the Lake Biwa basin in of the type and newly collected adults of G. yari- Shiga Prefecture, central Japan. Later, additional tanago and cercariae of C. problematica proved adult specimens of G. yaritanago and daughter that the original description of G. yaritanago by rediae and cercariae of Cercaria problematica Shimazu et al. (2011) includes some errors of Faust, 1924 were obtained from the same basin. taxonomic importance at the generic level and The cytochrome c oxidase subunit I gene (COI) supported the suggestion made above. In this of the mitochondrial DNA of the adult and cer- paper, we present results of the morphological 120 Misako Urabe and Takeshi Shimazu and molecular studies of the cercaria C. problem- canal, Kominami, 26 April 2010, 28 April 2012. atica and the adult G. yaritanago, propose a new (7) Cercariae (NSMT-Pl 5857), serially sectioned halipegine derogenid genus with G. yaritanago or whole-mounted, ex midgut gland of S. reini- as the type species, and discuss the species name ana, irrigation canal, Kominami, 26 April 2010, of the taxon. 26 June 2010. Methods. Newly collected adult specimens were mostly flattened slightly, fixed with AFA, Materials and Methods stained with Heidenhain’s iron hematoxylin and Morphological study mounted in Canada balsam. Some were fixed in Material examined. (1) Type series of hot 10% formalin, serially sectioned (sagittal, Genarchopsis yaritanago, ex intestine of Tanakia 5 μm thick) and stained with hematoxylin and lanceolata (type host): holotype (LBM eosin. The type series of G. yaritanago was bor- 1340000079), adult, whole-mounted, irrigation rowed from the Lake Biwa Museum (LBM), canal (type locality) closely connected to Yogo Kusatsu, Shiga Prefecture. River, Nishiyama, [now in Kinomoto-cho, Naga- Cercariae were observed alive for the excre- hama City], Shiga Prefecture, 27 November tory system. Some daughter rediae and cercariae 2007; and 1 paratype (LBM 1340000080), adult, were fixed with AFA, stained with Heidenhain’s whole-mounted, irrigation canal, Miyake-cho, iron hematoxylin and mounted in Canada bal- Moriyama City, Shiga Prefecture, 27 October sam. Some others were fixed in 10% formalin, 2000 (Shimazu et al., 2011). (2) 1 adult specimen serially sectioned (5 μm thick) and stained with (NSMT-Pl 5854), slightly flattened, whole- hematoxylin and eosin. mounted, ex intestine of T. lanceolata, irrigation Drawings were made with the aid of a camera canal, Nishiyama, 27 May 2009. (3) 1 adult spec- lucida. Measurements (length by width) are imen (NSMT-Pl 5855), slightly flattened, whole- given in millimeters unless otherwise stated. The mounted, ex intestine of Tanakia limbata (Tem- newly collected specimens have been deposited minck and Schlegel, 1846) (Acheilognathinae) in the National Museum of Nature and Science (new host record), irrigation canal, Nishiyama, (NMNS, collection name code NSMT-Pl), Tsu- 29 July 2012. (4) Many immature and adult spec- kuba, Ibaraki Prefecture; and in M. Urabe’s per- imens (NSMT-Pl 5851 and 5853 and Urabe’s per- sonal collection. sonal collection), slightly flattened, whole- mounted, ex intestine of Rhodeus ocellatus Molecular study ocellatus (Kner, 1866) (Acheilognathinae) (new Samples sequenced. An adult worm found in host record), agricultural irrigation canal (new Rhodeus ocellatus ocellatus on 11 December locality record) connected to Hino River, Komi- 2010 and two daughter rediae found in the mid- nami, Yasu City, Shiga Prefecture, 2 May 2011, gut gland of Semisulcospira reiniana on 6 April 28 October 2011, 11 September 2012. (5) Several 2010 both from the agricultural irrigation canal immature and adult specimens (NSMT-Pl 5852), at Kominami were sequenced. The whole bodies hot formalin-fixed, serially sectioned or whole- were rinsed twice with TAE buffer (40 mM Tris, mounted, ex intestine of Acheilognathus 20 mM acetic acid, 1 mM EDTA; pH 8.0) and rhombeus (Temminck and Schlegel, 1846) preserved at –30°C until the DNA extraction. (Acheilognathinae) (new host record), irrigation Genomic DNA was extracted using a Wizard® canal, Kominami, 11 September 2012. (6) SV Genomic DNA Purification System (Pro- Daughter rediae (NSMT-Pl 5856–5857), serially mega, Madison, WI, USA). sectioned or whole-mounted, ex midgut gland of Sequencing. A partial region (627 bp) of the Semisulcospira reiniana (Brot, 1874) (Gastrop- COI was amplified. The primer set JB3 oda, Sorbeoconcha, Pleuroceridae), irrigation (5′-TTTTTTGGGCATCCTGAGGTTTAT-3′) Allogenarchopsis gen. nov. Parasitic in the Intestine of Freshwater Fishes 121 and COI R-Trema (5′-CAACAAATCATGATG- et al., 1985). This model was applied for the phy- CAAAAGG-3′) (Miura et al., 2005) was used for logenetic analysis with a default gamma parame- PCR amplification. PCR amplification was per- ter of 5. formed in 20 μL of reaction mixture containing 0.5 U ExTaq (TaKaRa Bio Inc., Otsu, Shiga, Results Japan), 10×ExTaq Buffer (TaKaRa), dNTPs (0.2 mM each), 0.5 μL template, and 0.5 μM for- Allogenarchopsis gen. nov. ward and reverse primers, using a MycyclerTM thermal cycler (Bio-Rad Laboratories, Hercules, Diagnosis. Digenea, Derogenidae, Halipegi- CA, USA). Thermocycling profiles were as fol- nae. Body spindle-shaped, small; tegument lows: 40 cycles of 10 s at 98°C, 30 s at 50°C, and smooth. Oral and ventral suckers well developed; 60 s at 72°C. The PCR products were separated ventral sucker a little posterior to middle of body. on electrophoresis gels and sequenced directly Prepharynx absent. Pharynx well developed. (DNA sequencing services provided by FASMAC Esophagus inverted Y-shaped, small, with ventral Co., Ltd., Atsugi, Kanagawa, Japan). The ana- pouch. Drüsenmagen present. Intestines forming lyzed sequences have been deposited in DDBJ cyclocoel near posterior extremity of body. Tes- (http://ddbj.sakura.ne.jp/). tes two, entire, almost symmetrical, lateral, Phylogenetic analyses. Molecular phyloge- between ventral sucker and ovary. Seminal vesi- netic trees were constructed together with the cle coiled, small. Pars prostatica vesicular; pros- COI sequences of Genarchopsis goppo Ozaki, tatic cells well developed. Ejaculatory duct short, 1925 (West and Central Japan Groups), Genar- uniting with metraterm to form short hermaphro- chopsis gigi Yamaguti, 1939, Genarchopsis felli- ditic duct running in sinus organ and opening on cola Shimazu, 1995 and Cercaria longicerca Ito, its apex. Sinus sac membranous, enclosing semi- 1953 in DDBJ (Urabe et al., 2012; accession nos. nal vesicle, prostatic complex, ejaculatory duct AB703662–AB703674). The COI sequences of and distal part of metraterm. Sinus organ perma- Fasciola hepatica Linnaeus, 1758 (Fasciolidae) nent, conical, small. Genital atrium tubular. Gen- (Le et al., 2000; accession no. AF216697) and ital pore median, slightly posterior or ventral to