Owstonia grammodon

description

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 1 st haemal spine 3 (4). Oblique body scale rows in midlateral series 40 ‒ 45; nape scaly and cheek scale rows 5 ‒ 6 (Fig. 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, re

Hidden diversity in deep-water bandfishes: review of Owstonia with descriptions of twenty-one new species (Teleostei: Cepolidae: Owstoniinae)

diagnosis

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.

Hidden diversity in deep-water bandfishes: review of Owstonia with descriptions of twenty-one new species (Teleostei: Cepolidae: Owstoniinae)

discussion

Remarks. Fowler's (1934 a) 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 1 st 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.

Hidden diversity in deep-water bandfishes: review of Owstonia with descriptions of twenty-one new species (Teleostei: Cepolidae: Owstoniinae)

distribution

Distribution. (Fig. 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.

Hidden diversity in deep-water bandfishes: review of Owstonia with descriptions of twenty-one new species (Teleostei: Cepolidae: Owstoniinae)