Oriengobio, Sun & Tang & Zhao, 2025
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publication ID |
https://doi.org/10.3897/zse.101.160106 |
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publication LSID |
lsid:zoobank.org:pub:8EA19722-8036-4468-BDE1-DFF41BE9CE7A |
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DOI |
https://doi.org/10.5281/zenodo.17371563 |
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persistent identifier |
https://treatment.plazi.org/id/C5CE45A8-E8EF-504B-98F6-A25DE867FFF2 |
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treatment provided by |
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scientific name |
Oriengobio |
| status |
gen. nov. |
Oriengobio gen. nov.
Fig. 11 View Figure 11
Type species.
Pseudogobio fukiensis Nichols, 1926 .
Diagnosis.
The new genus can be distinguished from all other genera within the Pseudogobionini by the combination of the following characters: (1) mouth horseshoe-shaped and inferior; (2) central portion of the anterior papillae usually larger than the lateral portion of the anterior papillae on upper lip, in one row; (3) lower lip forming two lateral lobes and a medial pad, without anterior fold; (4) lateral lobes on lower lip not in contact with each other posteriorly from medial pad; (5) medial pad bisected, heart-shaped, smooth; (6) upper jaw narrow, the horny margin width less than half mouth width; (7) lower jaw exposed from medial pad; (8) barbel in one pair; (9) midventral region of body usually scaleless before pectoral-fin base end; (10) pharyngeal teeth in one row; (11) anterior chamber of the air bladder enclosed in fibrous capsule; (12) posterior chamber relatively small, length smaller than half eye diameter, thin.
Description.
Body elongated, abdomen rounded; caudal peduncle short, compressed laterally. Mouth horseshoe-shaped and inferior; barbel one pair; lips thick, with developed papillae; central portion of the anterior papillae usually larger than lateral portion of anterior papillae on upper lip, in one row, lateral portion of anterior papillae in several rows; lower lip forming two lateral lobes and one medial pad, without anterior fold; two lateral lobes on lower lip not in contact with each other posteriorly from medial pad, laterally connected with upper lip anterior papillae around mouth corners; medial pad on lower lip bisected, heart-shaped, smooth. Jaws with horny sheathed edge; upper jaw narrow, horny margin width less than half mouth width; lower jaw exposed from medial pad (Fig. 3 D View Figure 3 ). Body covered with moderately large cycloid scales. Thoracic region scaleless, mid-ventral region usually covered with scales. Anus positioned in anterior one-third of pelvic-fin insertion and anal-fin base. Lateral line complete, almost straight. Lateral-line scales usually 34–39; scales above lateral line 3.5–4.5 (usually 3.5); scales below lateral line usually 1–2; predorsal scales 8–10; circumpeduncular scales 10–12 (usually 12). Distal margin of expanded dorsal fin steep sloped, usually slightly concave, with three unbranched and seven branched rays, pectoral fin with one unbranched and 9–13 branched rays, pelvic fin usually with one unbranched and six or seven branched rays, anal fin with three unbranched and five or six branched rays; caudal fin forked, with one simple ray and nine branched rays on upper lobe and eight branched rays and one simple ray on lower lobe, lobes pointed. Pharyngeal teeth “ 5–5 ” in one row. Air bladder small, possessing two chambers; anterior chamber rounded, enclosed in a thick fibrous capsule; posterior chamber small, length shorter than anterior chamber length, less than half eye diameter, thin. Intestine relatively long.
Distribution.
This genus is mainly distributed in southern China and northern Vietnam. The northernmost boundary of the distribution is the Qinling-Dabie Mountains, the southernmost boundary is the upper Xijiang River (the longest tributary of the Pearl River) in northern Vietnam, and the westernmost boundary is the Chengdu Plain in the upper Yangtze River Basin (Fig. 5 G View Figure 5 ).
Etymology.
The prefix “ orien- ” was derived from the Latin for eastern, referring to the Oriental realm in the faunal region. The majority of the species in this genus is distributed in the Oriental realm, which is different from the widespread genus Microphysogobio . The suggested Chinese name for this genus is “ 东洋鮈 ” 属, and the Chinese Pinyin name is “ Dōng Yáng Jū ” Shǔ.
Species included.
Oriengobio fukiensis (Nichols, 1926) , comb. nov. (type species).
Oriengobio tungtingensis (Nichols, 1926) , comb. nov.
Oriengobio kiatingensis (Wu, 1930) , comb. nov.
Oriengobio obtusirostris (Wu & Wang, 1931) , comb. nov.
Oriengobio vietnamica (Mai, 1978) , comb. nov.
Oriengobio microstomus (Yue, 1995) , comb. nov.
Oriengobio pseudoelongatus (Zhang & Zhao, 2001) , comb. nov.
Oriengobio zhangi (Huang, Zhao, Chen & Shao, 2017) , comb. nov.
Oriengobio wangcangensis (Chen, Yang & Guo, 2020) , comb. nov.
Remarks.
The new genus Oriengobio can be distinguished from the genus Biwia by having barbels (vs. no barbels), a reduced air bladder (vs. enlarged), and well-developed lip papillae (vs. thin and simple). It can be distinguished from the genus Platysmacheilus by having a one-row central portion of the anterior papillae (vs. several rows). It can also be distinguished from the genus Huigobio by having a one-row central portion of the anterior papillae (vs. two or more rows) and lateral lobes on the lower lip not in contact behind the medial pad (vs. in contact). It can be distinguished from the new genus Crossocheilogobio by having a thin rostral cap not semi-covering the central portion of the anterior papillae (vs. thick, semi-covering) and a heart-shaped medial pad (vs. a narrow and elongated medial pad). It is similar to the genus Microphysogobio in general morphology. Both genera possess tiny posterior chambers of the air bladder and similar lower lip patterns. However, Oriengobio can be distinguished from Microphysogobio by having a narrow upper jaw horny margin, less than half of the mouth width (vs. wide, larger than half of the mouth width).
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