Dysomma goslinei Robins & Robins, 1976
publication ID |
https://doi.org/ 10.11646/zootaxa.4060.1.12 |
publication LSID |
lsid:zoobank.org:pub:DCE83F63-6CBE-4166-884F-347DF0BEBB62 |
DOI |
https://doi.org/10.5281/zenodo.5295843 |
persistent identifier |
https://treatment.plazi.org/id/2503879E-FFD3-7F1C-FF05-FACFE02ED9C8 |
treatment provided by |
Plazi |
scientific name |
Dysomma goslinei Robins & Robins, 1976 |
status |
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Dysomma goslinei Robins & Robins, 1976
Table 2 View TABLE 2
Dysomma goslinei Robins & Robins, 1976:261 (type locality: Indian Ocean, 14°52'N, 96°39'W). Robins & Robins, 1989:249. Smith, 1999:1661. Chen & Mok, 2001:79.
Diagnosis. Pectoral fin present; dorsal-fin origin before pectoral-fin base, predorsal length 10.7% TL; anus anterior, just below pectoral fin, preanal length 16.2% TL; trunk very short, trunk length 4.0% TL; no intermaxillary teeth; multiple rows of teeth on upper jaw; 4 compound teeth on vomer; teeth on lower jaw multiserial, those on inner row slightly enlarged; lateral line short; and MVF 10-15-123. [Data adapted from Chen & Mok, 2001].
Remarks. No specimen from Taiwan is available for this study. Mok in Shen et al. (1993) first recorded the present species from Taiwan, but no voucher was mentioned. One specimen (NSYSU 2607, 207 mm TL) examined by Chen & Mok (2001) has only 123 total vertebrae, less than 130–131 provided by Robins & Robins (1989). However, we could not locate this specimen. More investigations are needed of the population in Taiwan.
Dysomma longirostrum Chen & Mok, 2001:79 (type locality: Nan-fang-ao, NE Taiwan). Ho & Shao, 2011:22 View Cited Treatment .
Specimens examined. Holotype: NSYU 2732 (196), Nan-fang-ao fish market, NE Taiwan, bottom trawl, 100–150 m, 12 Sep. 1992, coll. Y.- Y. Chen.
Other locality. MNHN 2003-1515 (1, 285), R/V Alis, stn. CP8, 24°54'S, 168°21'E, Norfolk Ridge, New Caledonia, Coral Sea, 540 m, 11 Aug. 1999.
Diagnosis. Pectoral fin present; origin of dorsal fin above tip of pectoral fin, predorsal length 17.9–18.6% TL; no intermaxillary teeth; snout very long, its length 25.7–32.1% HL; jaw long and slender, upper jaw length 42.0– 52.1% HL; anus posterior, far behind pectoral fin, preanal length 24.0–24.3% TL; trunk moderately long, trunk length 9.7–10.3% TL; multiple rows of teeth on upper jaw; 5 compound teeth on vomer; multiple rows of small teeth on lower jaw, those on inner row larger than the rest; head pores: SO 5, IO 8 (2 between nostrils, 2 below eye, 4 behind eye), M 7, POP 2, AD 1, ST 0, F 1; lateral-line pores: predorsal 11, prepectoral 3–6, preanal 20, total ca. 77 or ca. 96, the last at 2/3 HL before caudal fin; MVF 14-24-130 (holotype only). Body uniformly brown when preserved. [Data adapted from Chen & Mok, 2001 and based on present study].
Remarks. One additional specimen was found in the MNHN collection that represents the second record of the species, in New Caledonia.
Dysomma longirostrum is the only member with four head pores behind the eye and two POP pores among all congeners. There is one frontal pore in the holotype whereas the MNHN specimen has none. The count of total lateral-line pores is not accurate because the posterior portion of the lateral line (behind anus) is broken into small canals, each canal connects two pores. These canals are not evenly spaced and sometimes have additional pores in the space between two canals. However, this may be used as a diagnostic character because the other congeners examined in the present work all have a continuous lateral line.
TABLE 2. Morphometric and meristic data of Dysomma goslinei, Dysomma longirostrum and Dysomma melanurum. Data of D. goslinei and morphometric data of D. longirostrum are adapted from Chen & Mok (2001).
D. goslinei | D. longirostrum | D. melanorum |
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Holotype Non-type | ||
Total length (mm) 197 | 196 283 | 206–297 (n=13) |
% TL | Mean (range) | |
Head length 12.2 | 14.3 14.1 | 12.2 (11.0–13.4) |
Predorsal length 10.7 | 17.9 18.6 | 13.8 (11.5–15.0) |
Preanal length 16.2 | 24.0 24.3 | 16.2 (15.4–17.3) |
Trunk length 4 | 9.7 10.3 | 4.0 (3.0–5.3) |
Tail length 83.8 | 76 75.7 | 83.8 (82.7–84.6) |
Depth at gill opening – | – 6 | 2.8 (2.2–3.2) |
Depth at anus 4.6 | 5.1 6.5 | 3.0 (2.4–4.0) |
Width at anus – | – 3.5 | 1.8 (1.0–2.6) |
%HL | ||
Snout length 20.8 | 32.1 25.7 | 16.6 (13.8–19.2) |
Eye diameter 4.2 | 7.1 8.8 | 6.7 (5.4–9.1) |
Interorbital width – | – 15.8 | 5.9 (3.9–7.5) |
Upper jaw length 41.7 | 57.7 42.0 | 41.1 (36.2–45.3) |
Interbranchial width – | – 16.6 | 4.6 (2.4–6.1) |
Vertebrae | n=12 | |
Predorsal 10 | 14 – | 12–13 |
Preanal 15 | 24 – | 13–15 |
Total 123 | 130 – | 131–138 |
Lateral-line pores – | n=13 | |
Preanal – | 20 20 | 11–17 |
Total – | ca.96 ca.77 | 107–117 |
Head pores – | n=13 | |
Supraorbital 3 | 5 5 | 3 |
Infraorbital 5 | 8 8 | 4 |
Adnasal? | 1 1 | 1 |
Mandibular 6 | 7 7 | 7 (1 with 8) |
Preopercular – | 2 2 | 0 |
Supratemporal – | 0 0 | 0 |
Frontal – | 1 1 | 0 |
Vomerine teeth 4 | 5 5 | 5 or 6 |
Intermaxillary teeth 0 | 0 0 | 0 |
Dysomma longirostrum Chen & Mok, 2001 Fig. 5; Table 2 |
No known copyright restrictions apply. See Agosti, D., Egloff, W., 2009. Taxonomic information exchange and copyright: the Plazi approach. BMC Research Notes 2009, 2:53 for further explanation.
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Dysomma goslinei Robins & Robins, 1976
Ho, Hsuan-Ching, Smith, David G. & Tighe, Kenneth A. 2015 |
Dysomma goslinei
Chen 2001: 79 |
Smith 1999: 1661 |
Robins 1989: 249 |
Robins 1976: 261 |