Owstonia nigromarginata (Fourmanoir)

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 : 71-72

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.5245008

persistent identifier

https://treatment.plazi.org/id/B9494D69-BE73-AB36-0ACB-70DEFD9AFD38

treatment provided by

Plazi

scientific name

Owstonia nigromarginata (Fourmanoir)
status

 

Owstonia nigromarginata (Fourmanoir)

( Figure 60 View FIGURE 60 )

Sphenanthias nigromarginatus Fourmanoir, 1985:40 View in CoL , fig. 4 (original description; Philippines, 14°0.1'N, 120°17.1'E, 184‒186 m, MUSORSTOM II, sta. 2). GoogleMaps

Material examined. 2 specimens 65–68 mm SL as follows: MNHN 1982‒1251 About MNHN (68), holotype, Philippines, 14°0.1'N, 120°17.1'E, 184‒186 m, MUSORSTOM II, sta. 2, 20 Nov. 1980 GoogleMaps ; MNHN 1982‒1252 About MNHN (1, 65), paratype, same data as holotype GoogleMaps .

Diagnosis. A species of Owstonia with LL pattern type 1; unique in having a black stripe anteriorly on dorsal fin that tapers posteriorly and extends from distal third of 1st spine to the tip of 4th soft ray.

Description. (When counts vary, those of the paratypes are given in parentheses.) A species of Owstonia with LL pattern type 1, consisting 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 ray 16. Dorsal fin III, 21; anal fin I, 13; pectoral 19‒20; gill rakers 16 + 28 = 44 (14 + 26 = 40). Vertebrae: precaudal 11, caudal 17, total 28; anal-fin pterygiophores anterior to 1st haemal spine 2. Oblique body scale rows in mid-lateral series about 35–37; nape scaly and cheek scale rows 3. Lower limb margin of preopercle with about 8–10 small spines. Papillae in slight depression behind tip of premaxillary ascending processes 4, all papillae nearly equally sized with lateral pairs more closely spaced together, except the paratype with one anterior papilla missing on one side. Teeth in outer row of each premaxilla 15/18 (17/18); 1 or 2 inner teeth anteriorly. Teeth in lateral row of each dentary 9; symphyseal teeth 3–4, spike-like, and with 1–2 inner teeth anteriorly. Pelvic fin probably sexually dimorphic, extending posteriorly to anal-fin soft ray 8 in unsexed holotype (between rays 3–4 in slightly smaller, but unsexed paratype). Caudal fin lanceolate. Caudal fin 1.8‒(broken) times in SL; head 3.4‒3.6 times in SL; body depth at anal-fin origin 3.7‒4.4 times in SL.

Color pattern in alcohol: Anterior part of dorsal fin with narrow, black, distal stripe extending from spine 1 to soft ray 4; membrane connecting maxilla and premaxilla with prominent black stripe extending to near anterior end of premaxilla, and nner membrane covering posterior part of dentary also black. Fourmanoir (1985) recorded the dominant color of O. nigromarginata as pink, including the dorsal fin.

Proportions of 68 mm SL holotype are given first, followed by those of the 65 mm specimen (in parentheses) as percentages of SL: predorsal length 26.7(--); preanal length 59.9 (55.9); dorsal-fin base 63.5 (62.0); anal-fin base 31.8 (30.5); pelvic-fin length 53.7 (41.2); caudal-fin length 55.4 (broken off); body depth at anal-fin origin 21.8 (22.8); head length 27.9 (29.2); upper jaw length 15.3 (15.5); upper jaw depth 7.8 (6.7); orbit diameter 12.6 (11.9). As percentages of head length: upper jaw length 54.7 (53.2); orbit diameter 45.3 (40.8).

Comparisons. Other species with LL pattern type 1 and black pigment on the dorsal fin anteriorly differ in having melanophores extending to base of fin. The holotype of Owstonia doryptera possibly has dorsal-fin pigmentation similar to that of O. nigromarginata but differs in having LL pattern type 3 and a short pelvic fin extending only to anal-fin origin (vs. pelvic fin extending to anal-fin soft ray 8 in holotype and between rays 3‒4 in paratype).

Etymology. A combination of the Latin nigro (black) and marginatus (margin) in reference to the black stripe anteriorly on the distal margin of the dorsal fin.

Distribution. ( Fig. 23 View FIGURE 23 ) Known only from the Philippine type locality where trawled in 184‒ 186 m.

Remarks. Fourmanoir (1985) listed only two specimens of Sphenanthias nigromarginatus , which he recorded as 67 and 68 mm SL, and designated the larger specimen as the holotype. He recorded the number of anal-fin rays as I, 14 but examination of a radiograph of the holotype and our count of the paratype reveals that both specimens actually have only I, 13 anal-fin rays.

MNHN

Museum National d'Histoire Naturelle

Kingdom

Animalia

Phylum

Chordata

Class

Actinopterygii

Order

Perciformes

Family

Cepolidae

Genus

Owstonia

Loc

Owstonia nigromarginata (Fourmanoir)

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

Sphenanthias nigromarginatus

Fourmanoir 1985: 40
1985
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