This paper deals with two new species of the genus Dactylogyrus from marine fishes of Gobiidae. A new subjective synonym that is also a new record in China is concerned.1. Dactylogyrus qinzhouensis sp.nov. (Fig.1, a-b...This paper deals with two new species of the genus Dactylogyrus from marine fishes of Gobiidae. A new subjective synonym that is also a new record in China is concerned.1. Dactylogyrus qinzhouensis sp.nov. (Fig.1, a-b)Type-host: Glossogobius giuri Site: gills Type-locality and date: Qinzhou, Guangxi; May 7,1995 Type-specimens: Holotype no.GXqz1995050701; paratypes no.GXqz1995050702-3 About ten species of Dactylogyrus have been reported from fishes of Bobiidae in the world. This new species is similar to Dactylogyrus soni Gussev, 1995 (gobii Tripathi, renamed) which has the same species of host , but differs from the latter in the shape and size of hamuli, connective bar and copulatory organ. This species has a shorter hamuli (0.050-0.065 mm) and a longer point (0.020-0.022 mm), while the known species with a longer hamuli (0.095-0.102 mm) and a short point. The two laterals of the connective bar of this species are warped and with undulated wave, and the laterals of the connective bar of the known species become thickened and wide. The copulatory organ of the new species has a coiled tube of length 0.115-0.134 mm , the supporting apparatus which has a curve at the end is divided into two lobes at the base, while the length of copulatory tube of the old species is only 0.030 mm, and the supporting apparatus of the known species is also different. So, we regard this species as a new species in science and name it after its locality.2. Dactylogyrus microgobius sp.nov. (Fig. 2,a-b)Type-host: Microgobius gulosus, Microgobius sp.Site: gills Type-locality and date: Qisha, Guangxi; Sep.5,1995 Type-specimens: Holotype no.GXqsha1995090501; paratypes no.GXqsh1995090502; HNhk1998040301 This species is similar to Dactylogyrus gudaoensis Chen, 1982, but distinguishs from the latter in the shape and dimensions of hamuli, connective bar and copulatory organ. The length of the hamuli of this species is distinct smaller than the latter’s. The connective bar of the known species has two tubercules in the middle, while the bar is short and strong without tubercule in this species. The copulatory tube is nearly "S" shaped and the supporting apparatus "Y" shaped in known species and both the copulatory tube and the supporting apparatus are curved as "C" and with a deep fovea near the terminal in this speices. Therefore we regard this species as new and name it after its host. 3. Dactylogyrus bialatus Wu, Wang&Jiang, 1988 has been reported which has the characteristic of being well developed inner root, embryonic type hooklets, being two small knob-like projections in the middle of the connective bar ,and being a slight curved copulatory tube and divided, hook-shaped distal ends of the supporting apparatus etc.. All these important features along with the dimensions of this species (table 1) are nearly the same as that of Pseudodactylogyrus haze Ogawa, 1984. According to the 1961 ICZN, we think that Dactylogyrus bialatus is a subjective synonym of Pseudodactylogyrus haze Ogawa, 1984. Pseudodactylogyrus haze ( syn. D. bialatus) is first recorded in China and Synechogobius ommaturus is a new host of this species.展开更多
文摘This paper deals with two new species of the genus Dactylogyrus from marine fishes of Gobiidae. A new subjective synonym that is also a new record in China is concerned.1. Dactylogyrus qinzhouensis sp.nov. (Fig.1, a-b)Type-host: Glossogobius giuri Site: gills Type-locality and date: Qinzhou, Guangxi; May 7,1995 Type-specimens: Holotype no.GXqz1995050701; paratypes no.GXqz1995050702-3 About ten species of Dactylogyrus have been reported from fishes of Bobiidae in the world. This new species is similar to Dactylogyrus soni Gussev, 1995 (gobii Tripathi, renamed) which has the same species of host , but differs from the latter in the shape and size of hamuli, connective bar and copulatory organ. This species has a shorter hamuli (0.050-0.065 mm) and a longer point (0.020-0.022 mm), while the known species with a longer hamuli (0.095-0.102 mm) and a short point. The two laterals of the connective bar of this species are warped and with undulated wave, and the laterals of the connective bar of the known species become thickened and wide. The copulatory organ of the new species has a coiled tube of length 0.115-0.134 mm , the supporting apparatus which has a curve at the end is divided into two lobes at the base, while the length of copulatory tube of the old species is only 0.030 mm, and the supporting apparatus of the known species is also different. So, we regard this species as a new species in science and name it after its locality.2. Dactylogyrus microgobius sp.nov. (Fig. 2,a-b)Type-host: Microgobius gulosus, Microgobius sp.Site: gills Type-locality and date: Qisha, Guangxi; Sep.5,1995 Type-specimens: Holotype no.GXqsha1995090501; paratypes no.GXqsh1995090502; HNhk1998040301 This species is similar to Dactylogyrus gudaoensis Chen, 1982, but distinguishs from the latter in the shape and dimensions of hamuli, connective bar and copulatory organ. The length of the hamuli of this species is distinct smaller than the latter’s. The connective bar of the known species has two tubercules in the middle, while the bar is short and strong without tubercule in this species. The copulatory tube is nearly "S" shaped and the supporting apparatus "Y" shaped in known species and both the copulatory tube and the supporting apparatus are curved as "C" and with a deep fovea near the terminal in this speices. Therefore we regard this species as new and name it after its host. 3. Dactylogyrus bialatus Wu, Wang&Jiang, 1988 has been reported which has the characteristic of being well developed inner root, embryonic type hooklets, being two small knob-like projections in the middle of the connective bar ,and being a slight curved copulatory tube and divided, hook-shaped distal ends of the supporting apparatus etc.. All these important features along with the dimensions of this species (table 1) are nearly the same as that of Pseudodactylogyrus haze Ogawa, 1984. According to the 1961 ICZN, we think that Dactylogyrus bialatus is a subjective synonym of Pseudodactylogyrus haze Ogawa, 1984. Pseudodactylogyrus haze ( syn. D. bialatus) is first recorded in China and Synechogobius ommaturus is a new host of this species.
