Owstonia tosaensis Kamohara

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 : 89-91

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.5245032

persistent identifier

https://treatment.plazi.org/id/B9494D69-BE6D-AB2B-0ACB-70F7FDCDFDAC

treatment provided by

Plazi

scientific name

Owstonia tosaensis Kamohara
status

 

Owstonia tosaensis Kamohara View in CoL

( Figures 79 View FIGURE 79 , 80 View FIGURE 80 )

Owstonia tosaensis Kamohara, 1934:301 View in CoL , fig. (original description; off Kochi Prefecture, Japan); Kamohara, 1935:134, fig. 3 (redescription and illustration); Shiino, 1972:116 (common name Yellowfin jawfish); Machida in Masuda et al., 1984:201, pl. 192-G (brief description, color photograph); Shin et al, 1993:436, pl. 137‒5 (brief description, color photograph); Nakabo, 2002:914 (diagnosis, in pictorial key); Endo et al., 2016: 37(comparative material 12 specimens, 112–192 mm SL, listed from Japan and Taiwan).

Material examined. 12 specimens, 99‒228 mm SL: Japan CAS 133930 About CAS (1, 133) and CAS 133934 About CAS (1, 149) , Kochi Pref., Kochi, T. Kamohara; NSMT-P 54428 (1, 228), Shikoku , Kochi Pref., Kochi, Mimase Market. Taiwan ANSP 153169 About ANSP (2, 100 C&S‒127), Tung-Kang , fish market, 22°23'N, 120°25'E, E. Chen, 1 Dec. 1983 GoogleMaps ; ASIZP 66433 View Materials (1, 126), Nanfangao , Yilan, 24.5818°N, 121.8668°E, 2 Aug. 2005, Po-Feng Lee GoogleMaps ; ASIZP 60461 View Materials (1, 173), Hengchun , Pingtung, 22°N, 120.74°E, 6 Mar. 1992, K.T. Shao . Philippines MNHN 1984‒653 About MNHN (1, 111), MUSORSTOM 2, P. Fourmanoir, no other data . Western Australia CSIRO H6431‒02 (1, 148) , CSIRO H6431‒03 (2, 155‒190) and USNM 427947 About USNM (1, 99), N. of Monte Bello Islands , 19°47'S, 115°18'E, 209 m, 17 May 2006 GoogleMaps .

Diagnosis. A species of Owstonia with LL pattern type 2 that converges toward toward mid-line of nape but rarely unites to form a complete loop across nape; oblique body scale rows in mid-lateral series 44‒54; lower limb of preopercle with large, widely spaced spines ( Fig. 8 View FIGURE 8 K); dorsal- anal- and caudal-fins without wide white distal margins.

Description. A species of Owstonia with LL pattern type 2, consisting of a lateral line that originates from posttemporal sensory canal near anterodorsal margin of gill opening, extends upward and forms a "T" connection with horizontal section of lateral line ( Fig. 6 View FIGURE 6 B) that extends posteriorly just below dorsal-fin base to last ray and with the anterior section extending beyond dorsal fin and converging toward mid-line of nape but usually not united across nape ( Fig. 6 View FIGURE 6 F) but rarely forming a complete loop across nape (complete loop in only 1 of 10 specimens). Dorsal fin III, 23–24 (usually 23); anal fin I, 15–16; pectoral fin 19–21; gill rakers 15–19 + 28–33 = 45–51. Vertebrae: precaudal 12–13, caudal 17–18; total 29–30; anal-fin pterygiophores anterior to 1st haemal spine 4–5 ( Fig. 7 View FIGURE 7 C). Oblique body scale rows in mid-lateral series about 44–54; nape scaly and cheek scale rows 4–5. Lower limb margin of preopercle with 5–7 widely spaced, strong spines ( Fig. 8 View FIGURE 8 K). Papillae in slight depression behind tip of premaxillary ascending processes 4, arranged in 2 almost equally spaced pairs, with anterior pair the most obvious. Teeth in outer row of each premaxilla 20‒28; 0 (usually) or 1 inner tooth anteriorly. Teeth in lateral row of each dentary 10‒18, including 2−5 at anterior end that continue behind symphyseal teeth; symphyseal teeth 3‒6, short and peg-like, and with 1‒2 smaller inner teeth anteriorly. Pelvic fin probably sexually dimorphic, depressed fin extending to anal-fin soft rays 1‒5. Caudal fin lanceolate. Caudal fin 1.9‒2.2 times in SL; head 3.5‒4.7 times in SL; body depth at anal-fin origin 3.6‒4.5 times in SL.

Color pattern in alcohol: Adults with anterior part of dorsal fin uniformly pale; membrane connecting maxilla and premaxilla with prominent black stripe extending to near anterior end of premaxilla, and inner membrane covering posterior part of dentary also black. Kamohara (1934) described the life color of Owstonia tosaensis as "reddish, pale below. Anal yellowish, with two longitudinal red bands. Dorsal yellowish, with a longitudinal red band along the base. Upper half of caudal reddish, lower half yellowish." See also Fig. 79 View FIGURE 79 .

Proportions of 10 specimens 99–228 mm SL, as percentages of SL: predorsal length 20.7–27.1; preanal length 48.6–56.2; dorsal-fin base 60.0–71.4; anal-fin base 35.5–38.8; pelvic-fin length 28.9–41.6; caudal-fin length 45.8– 64.7; body depth at anal-fin origin 22.2–28.0; head length 21.5–28.1; upper jaw length 10.9–13.9; upper jaw depth 4.5–7.0; orbit diameter 8.4–12.2. As percentages of head length: upper jaw length 48.2–54.2; orbit diameter 34.4– 44.3.

Comparisons. Owstonia sarmiento , the only other species with LL pattern type 2, differs (characters of O. tosaensis in parentheses) in having in having fewer oblique body scale rows in mid-lateral series 27–30 (vs. 44–54) and cheek scale rows 2–3 (vs. 4–5), a different number of anal-fin rays II, 14 (vs. I, 15–16), and the anterior extension of lateral line forming a complete loop across nape (vs. typically not forming a complete loop). Excluding O. sarmiento , most species of Owstonia with III dorsal-fin spines also have fewer dorsal-fin soft rays, 19–22 (vs. 23–24).

Etymology. A combination of Tosa (former province of Japan, now Kochi Prefecture) and the Latin suffix ensis (meaning belonging to).

Distribution. ( Fig. 25 View FIGURE 25 ) Known from Japan, Taiwan, Philippines, and off Western Australia, in at least 209 m.

Remarks. Kamohara (1935) redescribed and illustrated Owstonia tosaensis based on a 350 mm specimen from Mimase, Japan. This specimen (BSKU 4230) was designated as a "neotype" by Kamohara (1961:8) but Eschmeyer et al (2016) consider the designation to be invalid.

Large adults of Owstonia tosaensis are distinctive in having dorsal fins with very elongate anterior soft rays, some exceeding the head length ( Fig. 80 View FIGURE 80 ).

CAS

California Academy of Sciences

ANSP

Academy of Natural Sciences of Philadelphia

ASIZP

Academia Sinica Institute of Zoology, Ichthyology Collection

MNHN

Museum National d'Histoire Naturelle

CSIRO

Australian National Fish Collection

USNM

Smithsonian Institution, National Museum of Natural History

Kingdom

Animalia

Phylum

Chordata

Class

Actinopterygii

Order

Perciformes

Family

Cepolidae

Genus

Owstonia

Loc

Owstonia tosaensis Kamohara

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

Owstonia tosaensis

Nakabo 2002: 914
Shin 1993: 436
Masuda 1984: 201
Shiino 1972: 116
Kamohara 1935: 134
Kamohara 1934: 301
1934
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