taxonID	type	description	language	source
6521F426FFEF747BFECFF9202DE7B8CA.taxon	materials_examined	Holotype. NSMT-Pl 6291 fixed in APG. Paratypes. Three specimens stained in Heidenhain’s iron hematoxylin (NSMT-Pl 6292) and six specimens fixed in APG (NSMT-Pl 6293).	en	Nitta, Masato, Nagasawa, Kazuya (2017): Dactylogyrus oryziasi n. sp. (Monogenea: Dactylogyridae) from Oryzias latipes (Beloniformes: Adrianichthyidae) in Japan. Species Diversity 22 (1): 1-5, DOI: 10.12782/sd.22_1, URL: http://dx.doi.org/10.12782/sd.22_1
6521F426FFEF747BFECFF9202DE7B8CA.taxon	description	Description. Body (Fig. 2 A) including haptor length 459 ± 99.0 (290 – 628; n = 9), width at mid-body 95 ± 12.9 (75 – 113; n = 9). Three pairs of head organs. Two pairs of eye-spots with some dissociated eyes. Alimentary systems consisting of spherical pharynx: diameter 44 ± 5.3 (33 – 50; n = 9), esophagus and bifurcated intestine confluent just posterior to testis. Testis ovate to pyriform, postero-dorsal to ovary. Vas deferens arising from anterior part of testis, looping around left intestinal caeca onto ventral, extending seminal vesicle located dorsal to copulatory organ (Fig. 2 N), entering base of copulatory organ. Two prostatic reservoirs saccate (Fig. 2 N). Male copulatory organ (Fig. 2 M, N) consisting of penis and accessory piece. Penis length 185 ± 24.0 (155 – 226; n = 7), clockwise coiling two and half and counterclockwise coiling one and half toward point; its tip passing through tube of accessory piece; its base touching base of sigmoid rod. Sclerotized accessory piece, length 23 ± 1.6 (21 – 26; n = 10), consisting of bended funnel-shaped tube and sigmoid rod connected to middle of tube. Ovary in mid-body, elongate. Oviduct arising anterior part of ovary, continuing as oötype surrounded by Mehlis’ gland. Vagina (Fig. 2 O) thin sclerotized tube, length 75 ± 15.3 (56 – 94; n = 5), arising from right side of oviduct; vaginal pore located at mid-body on right ventral body surface. Vitellaria co-extensive with intestinal caeca. Haptor length 48 ± 7.2 (34 – 55; n = 8), width 90 ± 5.2 (85 – 98; n = 8). Haptoral glands developed at base of haptor. Anchor (Fig. 2 B) total length 23 ± 0.9 (22 – 25; n = 10), length to notch 19 ± 0.7 (18 – 20; n = 10), outer root length 3 ± 0.5 (2 – 3; n = 10), inner root length 8 ± 0.9 (7 – 10; n = 10), point length 7 ± 0.7 (6 – 8; n = 10). Dorsal bar (Fig. 2 C) broad U-shape, total length 25 ± 0.8 (24 – 26; n = 10), total width 9 ± 0.8 (8 – 10; n = 10), median width 3 ± 0.7 (2 – 4; n = 10). Ventral bar (Fig. 2 D) broad V-shape, total length 26 ± 2.1 (24 – 31; n = 10), total width 5 ± 0.4 (4 – 5; n = 10), median width 3 ± 0.5 (2 – 3; n = 10). Marginal hooks in 7 pairs; hook length: pair I (Fig. 2 E) 16 ± 0.5 (16 – 17; n = 9); pair II (Fig. 2 F) 16 ± 0.4 (16 – 17; n = 9); pair III (Fig. 2 G) 17 ± 0.7 (16 – 18; n = 8); pair IV (Fig. 2 H) 17 ± 0.7 (16 – 18; n = 9); pair V (Fig. 2 I) 17 ± 0.4 (16 – 17; n = 9), pair VI (Fig. 2 J) 17 ± 0.5 (16 – 17; n = 9); pair VII (Fig. 2 K) 17 ± 0.5 (16 – 17; n = 9). Pair of needles (Fig. 2 L), length 8 ± 0.7 (7 – 9; n = 9), located near top of second hooks.	en	Nitta, Masato, Nagasawa, Kazuya (2017): Dactylogyrus oryziasi n. sp. (Monogenea: Dactylogyridae) from Oryzias latipes (Beloniformes: Adrianichthyidae) in Japan. Species Diversity 22 (1): 1-5, DOI: 10.12782/sd.22_1, URL: http://dx.doi.org/10.12782/sd.22_1
6521F426FFEF747BFECFF9202DE7B8CA.taxon	biology_ecology	Host. Oryzias latipes (Beloniformes: Adrianichthyidae). Site of infection. Gill filaments. Prevalence and intensity range (mean). Seven (35 %) of 20 fish examined were infected by 1 – 4 (mean: 1.6) worms. Sequence data. The partial 28 S rDNA (696 bp) sequence was submitted to DDBJ (accession no. LC 190737). A BLAST search of the sequence did not have any identical hit. The closest hits for this sequence are Dactylogyrus inexpectatus Isjumova in Gussev, 1955 (AJ 969945, 88 % similarity with 93 % coverage), D. petruschewskyi Gussev, 1955 (AY 548927, 87 % similarity with 83 % coverage), D. extensus Mueller and Van Cleave, 1932 (AY 553629, 84 % similarity with 93 % coverage), D. hemiamphibothrium Ergens, 1956 (AJ 969946, 84 % similarity with 97 % coverage) and D. lamellatus Achmerow, 1952 (AY 307019, 84 % similarity with 93 % coverage).	en	Nitta, Masato, Nagasawa, Kazuya (2017): Dactylogyrus oryziasi n. sp. (Monogenea: Dactylogyridae) from Oryzias latipes (Beloniformes: Adrianichthyidae) in Japan. Species Diversity 22 (1): 1-5, DOI: 10.12782/sd.22_1, URL: http://dx.doi.org/10.12782/sd.22_1
6521F426FFEF747BFECFF9202DE7B8CA.taxon	discussion	Remarks. This new species corresponds to the diagnostic characteristics of the genus Dactylogyrus Diesing, 1850 (Beverley-Burton 1984; Gussev et al. 2010), and the BLAST searches support the generic position of the species. Dactylogyrus oryziasi n. sp. resembles Dactylogyrus rysavyi Ergens, 1970 in a coiled penis passing through a tube of an accessory piece associated with a sigmoid rod, and the shape of the anchor (Ergens 1970). The new species, however, differs from D. rysavyi which has the penis making right-hand one and half turns and left-hand one and half turns toward the point and the rod of the accessory piece connecting to the end of its tube (Ergens 1970; Gussev et al. 2010).	en	Nitta, Masato, Nagasawa, Kazuya (2017): Dactylogyrus oryziasi n. sp. (Monogenea: Dactylogyridae) from Oryzias latipes (Beloniformes: Adrianichthyidae) in Japan. Species Diversity 22 (1): 1-5, DOI: 10.12782/sd.22_1, URL: http://dx.doi.org/10.12782/sd.22_1
6521F426FFEF747BFECFF9202DE7B8CA.taxon	etymology	Etymology. The new specific name is delivered from the generic name of the type host. Japanese name. The new Japanese name is a combination of “ medaka ” and “ yubigata-mushi ”, which are the Japanese name of Oryzias and Dactylogyrus (as “ yubigatamushi-zoku ”), respectively.	en	Nitta, Masato, Nagasawa, Kazuya (2017): Dactylogyrus oryziasi n. sp. (Monogenea: Dactylogyridae) from Oryzias latipes (Beloniformes: Adrianichthyidae) in Japan. Species Diversity 22 (1): 1-5, DOI: 10.12782/sd.22_1, URL: http://dx.doi.org/10.12782/sd.22_1
