Difference between revisions of "Formosania immaculata"
m (Imported from ZooKeys) |
m (1 revision imported) |
(No difference)
| |
Latest revision as of 13:09, 16 October 2023
| Notice: | This page is derived from the original publication listed below, whose author(s) should always be credited. Further contributors may edit and improve the content of this page and, consequently, need to be credited as well (see page history). Any assessment of factual correctness requires a careful review of the original article as well as of subsequent contributions.
If you are uncertain whether your planned contribution is correct or not, we suggest that you use the associated discussion page instead of editing the page directly. This page should be cited as follows (rationale):
Citation formats to copy and paste
BibTeX: @article{Sun2023ZooKeys1182, RIS/ Endnote: TY - JOUR Wikipedia/ Citizendium: <ref name="Sun2023ZooKeys1182">{{Citation See also the citation download page at the journal. |
Ordo: Cypriniformes
Familia: Gastromyzontidae
Genus: Formosania
Name
Formosania immaculata Sun, Zhou & Yang sp. nov. – Wikispecies link – ZooBank link – Pensoft Profile
Type material
Holotype. SHOU2021060325, 87.9 mm total length (TL), 77.4 mm standard length (SL), adult collected by Jia-Jun Zhou and Wei Sun on June 28, 2021, in Wuyi County, Jinhua City, Zhejiang Province, China (28.7179°N, 119.4939°E; c. 882 m a.s.l.).
Paratypes. Twelve specimens from the same locality as the holotype, SHOU2021060326-060337, 43.2–68.7 mm SL, were collected by Wei Sun and Jia-Jun Zhou on June 28, 2021.
Description
Morphometric measurements for the specimens examined are given in Table 2. See Fig. 1A–C for lateral, dorsal, and ventral views of the body and Fig. 2A for its mouthpart structures.
| Characters | F. immaculata sp.nov. (N=13) | F. davidi (N=15) | F. fasciolata (N=8) | F. galericula (N=11) | |||||
|---|---|---|---|---|---|---|---|---|---|
| Holotype | Holotype+paratypes | ||||||||
| Range | Mean+SD | Range | Mean+SD | Range | Mean+SD | Range | Mean+SD | ||
| Standard length (mm) | 77.4 | 43.2–77.4 | 61.7±7.80 | 58.5–75.4 | 67.8±6.08 | 50.4–73.4 | 58.9±7.85 | 50.5–67.3 | 59.0±4.63 |
| % of standard length (SL) | |||||||||
| Body depth | 17.9 | 16.1–21.1 | 17.6±1.29 | 17.3–19.2 | 18.4±0.59 | 16.2–17.4 | 16.8±0.41 | 13.5–18.4 | 15.5±1.37 |
| Head length | 22.9 | 22.5–25.9 | 23.6±1.05 | 21.1–24.5 | 23.1±0.99 | 22.7–27.0 | 24.2±1.48 | 22.7–26.3 | 24.5±1.00 |
| Head depth | 12.6 | 11.5–13.9 | 12.7±0.72 | 11.5–13.4 | 12.5±0.55 | 12.5–13.4 | 13.0±0.29 | 11.8–13.3 | 12.5±0.48 |
| Head width | 18.7 | 17.4–19.7 | 18.3±0.61 | 16.0–19.5 | 17.8±1.07 | 18.1–19.8 | 19.0±0.61 | 13.5–20.0 | 18.0±1.99 |
| Length of caudal peduncle | 12.2 | 12.2–14.3 | 13.2±0.65 | 10.5–13.9 | 11.8±1.01 | 10.2–12.8 | 11.1±0.82 | 10.4–13.0 | 11.8±0.83 |
| Depth of caudal peduncle | 12.4 | 12.4–14.3 | 12.9±0.59 | 11.3–13.2 | 12.2±0.58 | 12.2–13.8 | 13.1±0.56 | 10.2–12.7 | 11.3±0.65 |
| Dorsal-fin length | 20.7 | 19.6–22.4 | 20.9±0.90 | 20.2–23.1 | 21.4±0.96 | 20.2–23.2 | 21.8±1.03 | 19.6–22.4 | 21.2±0.84 |
| Pectoral-fin length | 23.5 | 22.0–25.0 | 23.7±0.92 | 22.3–24.2 | 23.3±0.53 | 22.8–27.4 | 24.5±1.47 | 22.4–26.7 | 25.0±1.31 |
| Pelvic-fin length | 20.3 | 19.0–21.2 | 19.9±0.65 | 19.2–21.6 | 20.2±0.80 | 19.8–22.2 | 21.0±0.90 | 19.1–21.8 | 20.8±0.87 |
| Anal-fin length | 19.1 | 16.8–19.1 | 18.1±0.74 | 17.7–20.5 | 19.3±1.04 | 18.1–22.1 | 19.6±1.18 | 17.1–19.8 | 18.4±0.99 |
| Dorsal-fin base length | 12.6 | 12.3–13.8 | 12.8±0.46 | 11.3–14.1 | 12.8±0.85 | 12.6–15.3 | 13.7±0.91 | 10.5–13.6 | 12.4±0.83 |
| Pectoral-fin base length | 7.5 | 6.6–8.4 | 7.3±0.58 | 6.2–8.0 | 6.8±0.57 | 6.3–8.1 | 7.4±0.61 | 6.4–8.5 | 7.3±0.58 |
| Pelvic-fin base length | 5.1 | 4.6–5.4 | 5.1±0.26 | 4.3–5.3 | 4.7±0.32 | 4.4–5.7 | 5.2±0.44 | 4.6–5.5 | 5.2±0.29 |
| Anal-fin base length | 7.4 | 6.4–8.1 | 7.1±0.51 | 6.3–8.0 | 7.3±0.59 | 5.9–8.6 | 7.2±1.03 | 6.0–7.7 | 6.9±0.49 |
| Predorsal length | 47.5 | 45.4–50.5 | 48.2±1.45 | 47.3–49.9 | 49.0±0.96 | 46.7–51.2 | 48.8±1.37 | 47.6–49.8 | 49.1±0.72 |
| Prepectoral length | 18.2 | 18.1–20.9 | 19.5±0.96 | 17.2–20.8 | 19.3±1.00 | 20.2–22.2 | 21.0±0.69 | 17.8–23.1 | 20.7±1.36 |
| Prepelvic length | 52.1 | 50.8–54.5 | 52.8±1.07 | 51.7–55.0 | 53.4±0.94 | 52.2–54.9 | 53.8±0.95 | 52.0–55.8 | 54.2±1.42 |
| Preanal length | 79.3 | 78.1–80.4 | 79.4±0.74 | 77.2–82.8 | 79.9±1.91 | 78.4–83.3 | 80.6±1.71 | 75.9–82.2 | 79.8±1.94 |
| % of head length (HL) | |||||||||
| Snout length | 47.8 | 44.6–48.2 | 46.0±0.93 | 40.7–44.8 | 43.2±1.35 | 42.2–43.8 | 43.2±0.49 | 39.9–45.9 | 43.1±1.96 |
| Head depth | 55.0 | 48.7–60.6 | 53.9±3.44 | 50.1–56.9 | 53.8±2.17 | 49.5–58.8 | 53.8±3.08 | 47.6–53.9 | 51.0±1.99 |
| Eye diameter | 13.9 | 13.7–16.8 | 15.1±1.07 | 13.1–15.8 | 14.3±0.90 | 14.8–17.7 | 16.3±0.92 | 15.1–17.3 | 15.9±0.81 |
| Interorbital width | 43.4 | 35.1–43.4 | 39.2±2.53 | 32.1–42.5 | 38.8±2.73 | 32.6–41.9 | 37.9±2.90 | 33.3–39.1 | 36.4±1.88 |
| % of caudal peduncle length | |||||||||
| Depth of caudal peduncle | 101.7 | 91.0–101.9 | 97.8±3.74 | 86.0–109.3 | 103.4±7.34 | 107.9–130.6 | 118.8±7.85 | 86.2–106.2 | 96.5±6.01 |
| % of eye diameter | |||||||||
| the outermost pair of rostral barbels length | 124.2 | 112.9–140.0 | 122.2±8.61 | 128.3–175.4 | 159.0±15.63 | 119.8–167.5 | 145.6±14.01 | 105.6–138.8 | 113.5±9.09 |
| Maxillary barbels length | 113.7 | 94.2–123.9 | 105.1±9.00 | 94.3–150.4 | 126.9±17.61 | 94.0–142.0 | 120.1±14.25 | 83.5–107.0 | 95.0±7.01 |
| Lower lip papillae length | 23.2 | 19.9–24.4 | 22.8±1.59 | 47.0–61.9 | 53.0±5.36 | 40.3–51.0 | 47.0±3.25 | 16.3–25.4 | 21.0±3.02 |
| % of the postorbital length | |||||||||
| Snout length | 124.3 | 114.5–125.0 | 119.6±3.62 | 97.7–102.7 | 100.6±1.46 | 99.6–103.5 | 101.6±1.43 | 96.4–102.4 | 99.3±1.78 |
| Meristic counts | |||||||||
| Dorsal-fin rays | iii,8 | iii,8 | iii,8 | iii,8 | iii,8 | ||||
| Pectoral-fin rays | i,14 | i,13–14 | i,14–15 | i,14 | i,13–14 | ||||
| Pelvic-fin rays | i,8 | i,8 | i,8 | i,8 | i,8 | ||||
| Anal-fin rays | ii,5 | ii,5 | ii,5 | ii,5 | ii,5 | ||||
| Lateral-line scales | 92 | 92–98 | 89–100 | 90–96 | 89–95 | ||||
Dorsal fin had three unbranched and eight branched rays; origin slightly in front of pelvic-fin insertion, situated slightly ahead to the midpoint between snout tip and caudal-fin base. Pectoral fin developed, with one unbranched and 13–14 branched rays. Pelvic fins long with one unbranched and eight branched rays, tips of depressed pelvic fins reaching anus when pelvic-fin rays extended backward. Anus in middle of pelvic-fin insertion and anal-fin insertion; anal fin with two unbranched and five branched rays, with the tip of anal fin closing or reaching to caudal-fin base. Caudal fin slightly forked; lower lobe slightly longer than upper lobe.
Coloration. In life, body slightly brown; fins and rostral barbels slightly red; with inconspicuous black blotches on back of head (Fig. 5). In 10% formalin-fixed specimens, dorsal and flank of head and body grayish-brown; ventral surface of head and abdomen white to yellowish with many black spots after pectoral fins; all fins hyaline and light gray, without obvious blotches (Fig. 1).
Diagnosis
Formosania immaculata sp. nov. resembles the Formosania davidi species group (F. davidi, F. galericula and F. fasciolata) in having 13 well-developed rostral barbels arranged in one irregular row (Fig. 2A), while other congeners arranged in 2 rows (Fig. 2B). It is distinguished from the three species in the Formosania davidi species group by having no obvious blotches or stripes (vs. having blotches or stripes) on the body and snout length longer than (vs. equal to) postorbital length (see Fig. 3 and Table 3). The new species differs from F. davidi in having shorter rostral barbels [outermost pair 112.9%–140.0% (average 122.2) vs. 128.3%–175.4% (average 159.0%) of eye diameter], shorter lower lip papillae [19.9%–24.4% (average 22.8) vs. 47.0%–61.9% (average 53.0%) of eye diameter] and narrower abdominal scaleless area (extending to middle of pectoral-fin base vs. extending slightly behind pectoral-fin axil) (see Table 3); from F. fasciolata in having shorter rostral barbels [outermost pair 112.9%–140.0% (average 122.2) vs. 119.8%–167.5% (average 145.6%)] of eye diameter, shorter lower lip papillae [19.9%–24.4% (average 22.8) vs. 40.3%–51.0% (average 47.0%) of eye diameter] and shorter depth of caudal peduncle [91.0%–101.9% (average 97.8%) vs. 107.9%–130.6% (average 118.8%) of caudal peduncle length]; and from F. galericula in having narrower abdominal scaleless area (extending to middle of pectoral-fin base vs. extending slightly behind pectoral-fin axil).
| F. immaculata sp. nov. | F. davidi | F. fasciolata | F. galericula | |
|---|---|---|---|---|
| Distribution | Ou-jiang | Min-jiang | Feiyun-jiang | Ou-jiang |
| Blotches on the back | Absent | 7–9 black blotches | 7–9 light-colored blotches | 7–13 black blotches |
| Blotches on the flank | Absent | Irregular blotches | 18–22 anomalistic stripes | Filled with irregular blotches |
| Pectoral-fin rays | i,13–14 | i,14–15 | i,14 | i,13–14 |
| Outermost pair of rostral barbels length (% of eye diameter) | 112.9–140.0 (122.2±8.61) | 128.3–175.4 (159.0±15.63) | 119.8–167.5 (145.6±14.01) | 105.6–138.8 (113.5±9.09) |
| Lower lip papillae length (% of eye diameter) | 19.9–24.4 (22.8±1.59) | 47.0–61.9 (53.0±5.36) | 40.3–51.0 (47.0±3.25) | 16.3–25.4 (21.0±3.02) |
| Depth of caudal peduncle (% of caudal peduncle length) | 91.0–101.9 (97.8±3.74) | 86.0–109.3 (103.4±7.34) | 107.9–130.6 (118.8±7.85) | 86.2–106.2 (96.5±6.01) |
| Abdominal scaleless area | Extending to the middle of the pectoral-fin base | Extending slightly behind the pectoral-fin axil | Extending to the middle of the pectoral-fin base | Extending slightly behind the pectoral-fin axil |
| Snout length (% of the postorbital length) | 114.5–125.0 (119.6±3.62) | 97.7–102.7 (100.6±1.46) | 99.6–103.5 (101.6±1.43) | 96.4–102.4 (99.3±1.78) |
Etymology
The specific epithet is the Latin form of the word immaculate here referring to the unique body of no blotches or stripes. We propose the Chinese common name Wú Bān Yīng Kǒu Qiū (无斑缨口鳅).
Distribution and habitat
The new species is known only from the upper reaches of the Xuanping-Xi, a stream tributary to the Ou-Jiang River, in Wuyi County, Zhejiang Province, China (Fig. 4). It inhabits fast-flowing streams with gravelly and pebbly substrates (Fig. 5).
Original Description
- Sun, W; Zhou, J; Yang, J; 2023: Formosania immaculata, a new species of hillstream loach (Teleostei, Cypriniformes, Gastromyzontidae) from the Ou-Jiang River, Southeast China ZooKeys, 1182: 207-221. doi
Images
|
