Neobythites monocellatus Nielsen, 1999
publication ID |
https://doi.org/ 10.11646/zootaxa.5336.2.2 |
publication LSID |
lsid:zoobank.org:pub:7BD6357E-BB67-44E9-B028-4CA7A2769660 |
DOI |
https://doi.org/10.5281/zenodo.8272461 |
persistent identifier |
https://treatment.plazi.org/id/039287FE-FC33-FF94-76BA-EDF7FD5F97E4 |
treatment provided by |
Plazi |
scientific name |
Neobythites monocellatus Nielsen, 1999 |
status |
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Neobythites monocellatus Nielsen, 1999 View in CoL
Figure 6 View FIGURE 6 ; Tables 1 View TABLE 1 , 5 View TABLE 5
Neobythites monocellatus Nielsen, 1999: 351 View in CoL , figs. 8–9 (off Venezuela, 09°53′N, 59°53′W, 229 m; holotype: USNM 309234 About USNM ).
Diagnosis. Spine on hind margin of preopercle absent or thin and flat; dorsal-fin rays 93–99; anal-fin rays 78–83; pectoral-fin rays 24–27; precaudal vertebrae 12–13; total vertebrae 54–58; pseudobranchial filaments 4–6; long rakers on anterior gill arch 13–15; head length 21–24% SL; pelvic-fin length 17–23% SL, fins not extending beyond anus; orbit length 4.9–7.0% SL and 22–30% HL; longest gill filament 1.4–2.0% SL and 6.2–9.0% HL; dorsal fin with central ocellus with black spot placed well behind vertical line through anus, the ocellus spot distance being 41–51% SL and the spot covering 6–7 dorsal-fin rays, not extending ventrally to body; no vertical bars on body; otolith length 5.0–5.8% SL, sulcus length 4.0–4.7% SL, and ostium height 18–22% sulcus length and 28–34% ostium length.
Distribution and size. Found in the tropical W and SW Atlantic from off Honduras and along the north coast of South America to French Guiana and off Bahia, E Brazil, on the continental shelf and upper slope (117–439 m). Max. size 154 mm SL.
Comparisons. Neobythites pako n. sp. differs clearly from all other steatiticus species in having a very short but distinct single preopercular spine vs. none or only a very weakly formed, flat, or indistinct spine, and in the combination of several colour, meristic, morphometric, and otolith characters ( Table 5 View TABLE 5 ). It is most similar to N. malayanus and N. stefanovi . From N. malayanus , it differs in longer upper jaw relative to head length in combination with slightly deeper body, shorter pelvic fins and postorbital distance ( Fig. 7 View FIGURE 7 ), and it differs in several otolith characters including shorter and shallower otolith, and shallower ostium relative to SL, sulcus, and ostium length ( Table 5 View TABLE 5 ; Fig. 3E, F View FIGURE 3 ). It differs from the Indonesian population (type locality) of N. malayanus in having more anal-fin rays, fewer pseudobranchial filaments, and shorter preanal distance, from the Vanuatu population in having in longer gill-filaments and from the Philippine population (which is most similar) in having fewer pseudobranchial filaments ( Table 6 View TABLE 6 ). It differs from N. stefanovi in its absence of dark dorsal-fin margin, higher number of precaudal vertebrae, vertebrae number below dorsal-fin origin, smaller ocellus spot, and shallower otolith ostium ( Table 5 View TABLE 5 ).
For further comparisons among all other steatiticus group members except for the W Atlantic N. monocellatus , see Uiblein & Nielsen (2018). Neobythites monocellatus differs from N. pako n. sp. in lack of dark stripe along anal fin, more dorsal-, anal- and pectoral fin rays, more pseudobranchial filaments, more developed gill rakers, and longer pelvic fins; N. monocellatus is most similar to six steaticus group species, N. gloriae , N. lombokensis , N. malayanus , N. meteori , N. steatiticus and N. stefanovi , from which it differs in having a combination of relatively high number of dorsal- and anal-fin rays and gill rakers, relatively longer pelvic fins, shorter postorbital distance, and smaller-sized ocellus spot; from the remaining species, N. malhaensis , it differs in fewer pectoral-fin rays, more pseudobranchial filaments, longer pelvic fins, and smaller ocellus spot.
Remarks. One Neobythites malayanus specimen (length 171+ mm) from off Lombok could not be studied in detail due to missing its tail ( Table 6 View TABLE 6 ). Like N. unimaculatus , N. malayanus should be studied in more detail regarding geographic differentiation ( Table 6 View TABLE 6 , Fig. 7 View FIGURE 7 ).
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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Neobythites monocellatus Nielsen, 1999
Uiblein, Franz & Nielsen, Jørgen G. 2023 |
Neobythites monocellatus
Nielsen, J. G. 1999: 351 |