Review of the arrowtooth eel genera Dysomma and Dysommina in Taiwan, with the description of a new species (Anguilliformes: Synaphobranchidae: Ilyophinae)
Author
Ho, Hsuan-Ching
Author
Smith, David G.
Author
Tighe, Kenneth A.
text
Zootaxa
2015
4060
1
86
104
journal article
39199
10.11646/zootaxa.4060.1.12
ca0b84ea-10e9-4bc9-9fa7-e80cf743106b
1175-5326
237500
DCE83F63-6CBE-4166-884F-347DF0BEBB62
TABLE 1. Morphometric and meristic data of Dysomma taiwanensis sp. nov., Dysomma anguillare and Dysomma dolichosomatum. | D. taiwanensis sp. nov. | D. anguillare | D. dolichosomatum |
|---|
| Holotype Paratypes | | |
|---|
| Total length (mm) | 496 192–248 (n=3) | 334–477 (n=25) | 166–357 (n=25) |
|---|
| % TL | Mean (range) | Mean (range) | Mean (range) |
|---|
| Head length | 12.8 11.4 (10.5–12.7) | 13.3 (11.0–15.1) | 9.9 (8.3–10.9) |
|---|
| Predorsal length* | 12.1 11.6 (11.3–11.9) | 11.8 (10.7–13.1) | 17.8 (16.5–19.1) [23.4] |
|---|
| Preanal length | 16.7 14.9 (13.3–16.5) | 17.0 (15.2–18.9) | 25.8 (23.3–28.6) |
|---|
| Trunk length | 3.3 3.5 (2.8–3.8) | 3.7 (2.8–5.5) | 16.0 (14.3–17.7) |
|---|
| Tail length | 83.3 84.1 (83.5–85.4) | 82.8 (81.1–84.1) | 74.2 (71.4–76.7) |
|---|
| Depth at gill opening | 4.7 3.6 (3.4–3.7) | 4.5 (3.1–5.8) | 4.2 (2.9–6.5) |
|---|
| Depth at anus | 5.3 3.4(2.5–4.2) | 4.5 (2.4–6.0) | 3.8 (1.1–6.1) |
|---|
| Width at anus | 3.5 2.5 (2.2–2.8) | 3.1 (1.7–4.6) | 2.8 (2.0–5.8) |
|---|
| % HL | | | |
|---|
| Snout length | 22.2 25.3 (24.4–26.7) | 20.2 (17.8–23.5) | 20.1 (17.1–23.9) |
|---|
| Eye diameter | 6.1 6.5 (4.7–7.5) | 6.5 (5.3–9.4) | 8.6 (5.9–14.3) |
|---|
| Interorbital width | 14.8 14.5 (13.9–15.1) | 15.6 (11.5–20.4) | 14.8 (11.0–22.2) |
|---|
| Upper jaw length | 43.1 41.7 (41.1–42.2) | 35.8 (31.9–39.5) | 37.8 (31.0–43.9) |
|---|
| Interbranchial width | 15.3 9.0 (7.1–10.9) | 8.3 (4.4–12.1) | 13.2 (8.8–19.4) |
|---|
| Vertebrae | n=3 | n=20 | n=23 |
|---|
| Predorsal* | 9 9–10 | 7–9 | 15–20 [25] |
|---|
| Preanal | 14 13–17 | 12–16 | 23–31 |
|---|
| Total | 137 137–139 | 119–128 | 146–156 |
|---|
| Lateral-line pores | n=3 | n=16 | n=26 |
|---|
| Preanal | 12 9–12 | 8–12 | Not reaching anus |
|---|
| Total | 45;48 40–45 | 57–75 | 9–11 |
|---|
| Head pores | n=3 | n=16 | n=26 |
|---|
| Supraorbital | 3 3 | 3 | 3 |
|---|
| Infraorbital | 4 4 | 4 or 5 | 4 |
|---|
| Adnasal | 1 1 | 1 | 1 |
|---|
| Mandibular | 6 6 | 6 | 6 (1 with 7) |
|---|
| Preopercular | 0 0 | 0 | 1 |
|---|
| Supratemporal | 0 0 | 0 | 0 |
|---|
| Frontal | 0 0 | 0 | 0 |
|---|
| Vomerine teeth | 4 4 | 4 | 3 |
|---|
| Intermaxillary teeth | 2 2 | 2 | 2 |
|---|