Owstonia grammodon (Fowler)

Smith-Vaniz, William F. & Johnson, David, 2016, Hidden diversity in deep-water bandfishes: review of Owstonia with descriptions of twenty-one new species (Teleostei: Cepolidae: Owstoniinae), Zootaxa 4187 (1), pp. 1-103 : 50-51

publication ID

https://doi.org/ 10.11646/zootaxa.4187.1.1

publication LSID

lsid:zoobank.org:pub:4F14F9CF-6D55-4ECF-B034-C446B7A1AAC0

DOI

https://doi.org/10.5281/zenodo.5244977

persistent identifier

https://treatment.plazi.org/id/B9494D69-BE04-AB43-0ACB-738CFD3DFB78

treatment provided by

Plazi

scientific name

Owstonia grammodon (Fowler)
status

 

Owstonia grammodon (Fowler) View in CoL

( Figure 38 View FIGURE 38 )

Opsipseudochromis grammodon Fowler, 1934a:357 View in CoL , fig. 107 (original description; type locality erroneously given as "between Gillolo and Kayoa islands", but see Remarks).

Owstonia grammodon View in CoL (non Fowler). Okada and Suzuki, 1956:185, fig. 1 (osteology; based on misidentification of O. japonica View in CoL ); Endo et al., 2015:[7] and 2016:37 (comparative material two specimens, 102‒116 mm SL from Taiwan).

Material examined. 5 specimens, 51‒127 mm SL. Sulawesi : USNM 93167 View Materials (67), holotype of Opispseudochromis grammodon , Sulawesi, Doworra Islands , 0°50'S, 128°12'E, 375 m, R/ V Albatross sta. D.5629, 2 Dec. 1909 GoogleMaps ; USNM 149321 View Materials (1, 127) and USNM 151389 View Materials (1, 51), same data as holotype. Taiwan GoogleMaps : ASIZP 59004 View Materials (1, 102) Nanfang-ao Yilan, 24.5818°N, 121.8668°E, B.H. Gao, 1 Jul. 1993 GoogleMaps ; ASIZP 64630 View Materials (1,115.6), Da-xi , Yilan, 24.94°N, 121.9°E, fish market, K.- T. Shao, 27 Jun. 2004 GoogleMaps .

Diagnosis. A species of Owstonia with LL pattern type 1; lower limb margin of preopercle without spines; dorsal fin III, 2 0–22; anal fin I, 13; dorsal fin without black blotch anteriorly in adults; black premaxillary stripe; adults with 33–39 teeth in outer row of each premaxilla.

Description. A species of Owstonia with LL pattern type 1, conisting of a simple lateral line that originates from posttemporal sensory canal near anterodorsal margin of gill opening, curves upward and backward then continues posteriorly just below dorsal-fin base to soft rays 19‒22. Dorsal fin III, 20–22; anal fin I, 13; pectoral fin 19; gill rakers 11+25 (in 67 SL holotype), 13/14+26/27 = 40 (in largest 127 SL specimen) and 13+22–23 = 35‒36 (in 102–116 SL Taiwan specimens). Vertebrae (values for Taiwan specimens in parentheses): precaudal 11 (12), caudal 17 (16), total 28; anal-fin pterygiophores anterior to 1st haemal spine 3 (4). Oblique body scale rows in midlateral series 40‒45; nape scaly and cheek scale rows 5‒6 ( Fig. 12 View FIGURE 12 D). Lower limb margin of preopercle without spines. Papillae in slight depression behind tip of premaxillary ascending processes 4, arranged in 2 almost equallyspaced pairs. Teeth in outer row of each premaxilla of holotype ca. 38 (33‒39); 1 or 2 inner teeth anteriorly. Teeth in lateral row of each dentary in holotype ca. 17 (15‒18), the mid-lateral teeth relatively large and slightly hooked backward; symphyseal teeth 3 or 4, relatively large and conical ( Fig. 10 View FIGURE 10 C), and with 2 (2‒4) inner teeth anteriorly. Depressed pelvic fin extending to anal-fin origin in largest (unsexed) Philippine specimen and in Taiwan specimens. Caudal fin lanceolate.

Color pattern in alcohol: Dorsal fin uniformly pale; membrane connecting maxilla and premaxilla with evidence of dark stripe extending to near anterior end of premaxilla, and inner membrane covering posterior part of dentary pigmented.

Proportions of 67 mm SL holotype are given first, followed (in parentheses) by those of the 127 mm SL specimen and then the 102–116 mm SL Taiwan specimens, as percentages of SL: predorsal length 29.4‒(26.5, 27.3, 29.6); preanal length 55.6‒(57.4, 55.4, 53.8); dorsal-fin base 59.6‒(59.2, 61.9, 64.0); anal-fin base 32.9‒(32.9, 31.6, 32.5); pelvic-fin length [tip broken off] –(23.8, 25.5, 26.5); caudal-fin length 38.7‒(31.0, 46.1, 56.5); body depth at anal-fin origin 29.2‒(26.5, 21.3, 24.0); head length 32.3‒(28.2, 26.1, 28.5); upper jaw length 17.0‒(16.0, 14.5, 14.9); upper jaw depth 7.9‒(7.0, 6.8, 6.9); orbit diameter 16.0‒(12.9, 11.2, 11.7). As percentages of head length: upper jaw length 52.8‒(56.6, 55.5, 52.2); orbit diameter 49.4‒(45.7, 42.7, 41.2). Life coloration unknown.

Comparisons. Owstonia hawaiiensis and O. ignota , the only other species with most of the diagnostic characters of O. grammodon , differ in lacking a premaxillary stripe (vs. prominent black stripe in O. grammodon ). These two species, together with Owstonia grammodon , also differ from most congeners with LL pattern 1 in having relatively small and numerous teeth (33‒39) in outer row of each premaxilla (see Table 3 View TABLE 3 ).

Etymology. A combination of the Greek gramme (line, or row) and odon (tooth), presumably in reference to the mostly single rows of teeth in the jaws.

Distribution. ( Fig. 23 View FIGURE 23 ) Known from the type locality in Sulawesi, Indonesia based on three specimens, all in relatively poor condition, taken together in the same trawl haul in 375 m, and two fish market specimens from Taiwan.

Remarks. Fowler's (1934a) original description of this species was based on a single Albatross specimen but we found two others with identical collection data. The type locality given in the original description "between Gillolo and Kayoa Islands" is erroneous for Albatross station D.5629 but correct as recorded for the holotype USNM 93167 in material examined. See Smith and Williams (1999) for history of the Albatross Philippine Expedition and its fishes. Fowler's counts of anal-fin rays and gill rakers (I, 17 and 8 + 21 respectively) for the holotype are also inaccurate; our counts for the same elements are I, 13 and 11 + 24. The largest Sulawesi specimen has the highest gill raker counts.

The Sulawesi specimens differ from the two Taiwan specimens in having 11 + 17 (vs. 12 + 16) vertebrae and anal-fin pterygiophores anterior to 1st haemal spine 3 (vs. 4), but are otherwise very similar, especially in having relative high numbers of teeth in the outer row of each premaxilla (33–34 in Taiwan specimens vs. 36−39 in those from Sulawesi). When more specimens from both localities become available, the taxonomic status of fish from Taiwan should be re-evaluated.

Records of O. grammodon from Japan by various Japanese authors are probably all based on misidentifications of O. japonica (see synonymy for that species), because they did not list that species in their accounts and reported I, 14 anal-fin rays (versus our count of I, 13 for O. grammodon , see Table 4). In addition to having a different number of anal-fin soft rays, Owstonia japonica has fewer teeth in the outer row of each premaxilla (14−23, vs. 33−39), more total gill rakers (41−46, vs. 35−40, see Table 7 View TABLE 7 ), and lower limb margin of preopercle with spines (vs. preopercular spines absent in O. grammodon ).

USNM

Smithsonian Institution, National Museum of Natural History

ASIZP

Academia Sinica Institute of Zoology, Ichthyology Collection

Kingdom

Animalia

Phylum

Chordata

Class

Actinopterygii

Order

Perciformes

Family

Cepolidae

Genus

Owstonia

Loc

Owstonia grammodon (Fowler)

Smith-Vaniz, William F. & Johnson, David 2016
2016
Loc

Opsipseudochromis grammodon

Fowler 1934: 357
1934
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