Published September 5, 2024
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TABLE 1 in Redescription of the eel Ilyophis arx Robins, 1976 (Anguilliformes: Synaphobranchidae: Ilyophinae) with a description of a new species of Ilyophis, and a taxonomic synopsis of the Ilyophinae
Authors/Creators
- 1. Department of Vertebrate Zoology, National Museum of Natural History, Smithsonian Institution, Washington, D. C., U. S. A.
- 2. Smithsonian Institution, Museum Support Center, Suitland, MD, U. S. A.
- 3. Muttlebury's Mead, Chard Street, Thorncombe, Chard, TA 20 4 NB, U. K.
- 4. Ichthyology Section, Department of Marine Zoology, Senckenberg Research Institute and Museum of Nature, Senckenberg Society of Nature Research, Frankfurt am Main, Germany.
Description
TABLE 1. Morphometric, meristic and morphological data of Ilyophis arx Robins, 1976 and Ilyophis maclainei sp. nov. For bilateral pore counts, the counts are recorded left/right.
| Ilyophis arx | Ilyophis arx | Ilyophis maclainei | |||
|---|---|---|---|---|---|
| (reexamination of type series) | |||||
| Holotype | Paratypes | This study | Holotype | Paratype | |
| Total length (mm) | 439 | 353–401 (n=3) | 215–610 (n=21) | 242 | 263 |
| Proportions (% TL) | Mean (range) | Mean (range) | |||
| Predorsal length | 17.0 | 17.0 (16.0–17.7) | 16.1 (14.1–18.1) | 15.6 | 15.1 |
| Preanal length | 36.9 | 34.8 (32.9–37.2) | 36.5 (33.4–43.1) | 32.2 | 30.0 |
| Head length | 12.0 | 12.5 (12.0–13.0) | 12.4 (9.9–14.2) | 12.6 | 11.9 |
| Trunk length | 24.9 | 22.3 (20.9–24.2) | 24.1 (20.9–28.8) | 19.0 | 18.2 |
| Tail length | 63.1 | 65.2 (62.8–65.7) | 63.5 (56.9–66.6) | 67.8 | 70.0 |
| Body depth at anus | 6.4 | 5.2 (4.6–6.1) | 6.0 (4.4–7.4) | 4.1 | 4.8 |
| Proportions (% HL) | Mean (range) | Mean (range) | |||
| Snout length | 33.9 | 33.9 (30.7–35.0) | 30.9 (25.3–35.7) | 38.6 | 32.8 |
| Eye diameter | 11.0 | 11.7 (10.1–12.8) | 11.4 (9.4–13.7) | 10.8 | 13.7 |
| Postorbital distance | 57.9 | 56.8 (52.9–59.8) | 57.3 (54.5–62.6) | 56.8 | 54.0 |
| Upper-jaw length | 48.4 | 44.9 (42.8–47.0) | 46.9 (39.9–63.2) | 46.7 | 47.8 |
| Interorbital width | 24.8 | 24.8 (14.3–21.0) | 22.5 (14.2–31.4) | 21.6 | 21.0 |
| Gill-opening (GO) | 12.4 | 10.3 (9.1–11.6) | 11.4 (8.2–16.5) | 9.2 | 11.5 |
| Interbranchial width | 20.5 | 19.8 (17.2–24.9) | 19.6 (13.3–27.8) | 12.4 | 12.7 |
| Pectoral-fin length | 26.9 | 22.7 (19.0–22.9) | 19.0 (10.3–26.6) | 25.5 | 26.1 |
| Meristics | |||||
| SO pores | 3/3 | 3/3 | 3–4 | 3/3 | 3/3 |
| IO (including AD) pores | 5/5 | 5/5 | 5 | 6/6 | 6/6 |
| POM pores | 8/8 | 8/8 | 7–10 | 8/8 | 8/8 |
| PrePectoral LL pores | 3/4 | 3–6 | 2–6 | 4/5 | 5/4 |
| PreDorsal LL pores | 9/11 | 9–11 | 8–14 | 7/8 | 10/9 |
| PreAnus LL pores | 32/36 | 33–38 | 31–37 | 28/30 | 29/31 |
| PreAnalFin LL pores | 34/38 | 31–37 | 31–39 | 30/32 | 31/33 |
| Total LL pores | 39/39 | 38–54 | 31–47 | 89/88 | 94/93 |
| Dorsal rays | 322 | 309–315 | 281–347 | 359 | 339 |
| Anal rays | 257 | 235–261 | 219–251 | 288 | 291 |
| DR-AF origin | 75 | 67–80 | 70–95 | 66 | 67 |
| PreDorsal Vertebrae | 10 | 11–12 | 10–13 | 10 | 8 |
| PreAnus Vertebrae | 37 | 35–38 | 34–40 | 31 | 31 |
| PreAnalFin Vertebrae | 39 | 37–40 | 37–42 | 33 | 34 |
| PreCaudal Vertebrae | 58 | 57–58 | 54–62 | 53 | 54 |
| Total Vertebrae | 131 | 131–135 | 128–137 | 132 | 134 |
| Morphology | |||||
| Scales | No | No | No | Yes | Yes |
| Number of snout plicae | 4 | 4 | 4 | 6 | 6 |
| Lower jaw plicae | 4 | 4–5 | 4–6 | 4 | 4 |
Notes
Published as part of Tighe, Kenneth A., Smith, David G., Merrett, Nigel R., Frable, Benjamin W. & Zajonz, Uwe, 2024, Redescription of the eel Ilyophis arx Robins, 1976 (Anguilliformes: Synaphobranchidae: Ilyophinae) with a description of a new species of Ilyophis, and a taxonomic synopsis of the Ilyophinae, pp. 38 in Zootaxa 5506 (1) on page 38, DOI: 10.11646/zootaxa.5506.1.2, http://zenodo.org/record/13746099
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Additional details
Identifiers
References
- Robins, C. H. & Robins, C. R. (1976) New genera and species of dysommine and synaphobranchine eels (Synaphobranchidae) with an analysis of the Dysomminae. Proceedings of the Academy of Natural Sciences of Philadelphia, 122, 293 - 335.