Obliquogobius fluvostriatus Chen &amp; Jaafar &amp; Shao 2012, n. sp.
Creators: name: Chen, I-Shiung
name: Jaafar, Zeehan
name: Shao, Kwang-Tsao
Publisher: name: Zenodo
Year: 2012
Subjects: Biodiversity
Taxonomy
Animalia
Chordata
Actinopterygii
Perciformes
Gobiidae
Obliquogobius
Obliquogobius fluvostriatus

description: <i>Obliquogobius fluvostriatus</i> n. sp. (Figs. 1, 2) <b>Material examined.</b> Holotype, NSMT-P102090, 24.3 mm SL, male, Dredge Station No. 79; Kumejima, Ryukyu Islands, Japan, 26°14.686ʹN, 126°49.623ʹE, 141–165 m depth, Tabata (triangular dredge); 11 Nov. 2009; coll. Y.C. Liao <i>et al</i>. <b>Diagnosis.</b> <i>Obliquogobius fluvostriatus</i> <b>n. sp.</b> is distinguished from other congeners by the following combination of features: D2 rays I/9; A rays I/10; P rays 21; VC 26; LR 22; TR 7; belly scaled; isthmus, P base, cheek, predorsal region and operculum naked; gill opening very wide, extending forward of the vertical through rear margin of pupil; and specific life colouration as head with vertically infraorbital yellow band; one wide longitudinal yellow band from operculum terminating at posterior end of caudal fin, band increasingly wider, such that posterior half of body completely yellow. <b>Description.</b> Body proportions listed in Table 1. Body elongate, compressed. Head large (30.1% SL), compressed; snout profile slightly pointed and blunt, snout rather short. Eyes large, dorsal margin prominent; bony interorbital width narrow. Mouth oblique, forms a 45–50° angle to the horizontal, lower jaw terminates at a vertical of through anterior margin of the pupil. Lower jaw prominent; upper and lower jaws with 3–4 rows of conical teeth; outermost row of teeth irregularly arranged; 11–12 teeth on each side of upper jaw approximately four times larger than the rest; vomerine teeth absent; tongue truncate, weakly notched mid-tongue. Anterior naris a short tube, posterior naris as large hole. Gill opening very wide, extends anteroventrally through the rear margin of eye. VC 10 + 16 = 26. Dorsal pterygiophore formula 3/221101/9. Fins. D1 rays VI; D2 rays I/9; A rays I/10; P rays 21(left); V rays I/5+I/5; C segmented rays 17; C branched rays 13. D1 rays reaching D2 origin when adpressed; D2 rays shorter, not reaching segmented C rays when adpressed. P elliptical and long, rear tip extending posterior to vertical of A origin; A origin inserted into vertical of second element of D2; V rounded and moderately long, reaching genital papillae when adpressed, frenum absent, two sides of V joined together by concave, low connecting membrane, all soft rays of V splits into three branches twice. C asymmetrical with upper half of rays more protruded than those of lower half. Scales. LS 22; TR 7; PreD 0. Scales on body ctenoid posteriorly and cycloid anteriorly. Belly scaled; isthmus, pectoral fin base, cheek and operculum naked. Middle extension of predorsal region entirely naked. Anterolateral extension of scales on head to above terminal pore ρ of anterior oculoscapular canal, anterodorsal portion of nape partially abraded. Head lateral-line system. Canals: Oculoscapular canal present: anterior terminal paired pores σ, single interorbital pore λ, single pore κ, paired pores ω, paired postorbital pore α and lateral terminal pore ρ; preopercular canal with three pores as γ, δ and &amp;epsi;. Sensory papillae: Infraorbital papillae pattern longitudinal: row <i>a</i> short and not reaching vertical midline of eye; row <i>b</i> very short, along the lower margin of orbit, row <i>c</i> extending beyond vertical midline of orbit, row <i>d</i> with densely set papillae, row <i>cp</i> as single papilla, row <i>f</i> as paired papillae. Colouration in fresh preservative and markings. The following description is based on a photograph taken of a fresh specimen prior to preservation (Fig. 1). Ground colour beige to light gray; infraorbital yellow band about a half of pupil diameter in width, band originating below eye and coursing ventrally and terminates at rear margin of lower jaw, band does not persist in preservative; inverted-triangular grayish black mark obscured under yellow band when live; when preserved, only an inverted-triangular gray mark remains, the broad end originates below eye and the apex terminates at the posterior end of the lower jaw; mark made up of closely-set melanophores; region of snout anterior to aforementioned black mark beige and devoid of melanophores; anterior tips of upper and lower lips light pink; one wide longitudinal yellow band originating at the posterior end of the operculum and courses along mid-flank, terminating at posterior end of caudal fin, band about one pupil width, band increasingly widens such that posterior half of body is uniformly yellow; band immediately decreases in width at the origin of caudal fin, covering only lower two-thirds of C region; upper third of C dusky, due to random small black spots on fin membrane; yellow longitudinal band does not persist in preservative; lower two-third of C hyaline in preservative; D1 slightly damaged but some melanophores observed distally; D2 hyaline with thin longitudinal yellow stripe at base, stripe does not persist in long preservative; P, V and A hyaline. <b>Distribution.</b> This species is only known from Kumejima, Ryukyu Islands, Japan. <b>Etymology.</b> The specific name, <i>fulvostriatus</i>, is derived from the longitudinal yellow band (in Latin: “ <i>fulvo</i> + <i>striata</i> ”) on the trunk, a conspicuous character in the fresh specimen. <b>Remarks.</b> <i>Obliquogobius fulvostriatus</i> <b>n. sp.</b> and <i>O</i>. <i>megalops</i> Shibukawa &amp; Aonuma, 2007, have wide gill openings and a low connecting membrane between the pelvic fins versus narrower gill openings and the pelvic fins completely united in congeners. However, <i>O. fulvostriatus</i> <b>n. sp.</b> can be differentiated from <i>O. megalops</i> by these characters: D2 rays I/9, A rays I/10, P rays 21 (vs. D2 rays I/8, A rays I/9, P rays 23); black T-shaped mark absent from C base (vs. present); and dark markings absent from the body in the preserved specimen (vs. 5 narrow vertical black bars in preserved specimens).
description: Published as part of <i>Chen, I-Shiung, Jaafar, Zeehan &amp; Shao, Kwang-Tsao, 2012, A new Obliquogobius (Teleostei: Gobiidae) from Kumejima, Ryukyu Islands, Japan, pp. 269-273 in Zootaxa 3367 (1)</i> on pages 270-272, DOI: 10.11646/zootaxa.3367.1.25, http://zenodo.org/record/5252180
description: {"references": ["Shibukawa, K. &amp; Aonuma, Y. (2007) Three new species of the deep-dwelling goby genus Obliqougobius (Teleostei: Gobiidae: Gobiinae) from Japan, with comments on the limits of the genus. Bulletin National Museum Natural Sciences, ser. A, Supplement 1, 137 - 142."]}