Scarus dimidiatus Bleeker 1859

Males recognized by the blue snout and band behind eye. Eastern form has blue cheek and western form has yellow cheek. Females grey to yellow with dusky saddle over back (Ref. 48636). Closely resembles S. oviceps and S. scaber. In S. oviceps, the initial phase has fewer, less vertical diagonal dark bars on the back and the terminal phase lacks the light-centered bar between the eye and the pectoral fin base, is darker and less brilliant blue on the upper head and back, and is usually larger.

Oviparous, distinct pairing during breeding (Ref. 205).

Dorsal spines (total): 9; Dorsal soft rays (total): 10; Analspines: 3; Analsoft rays: 9

Occurs inshore (Ref. 75154). Feeds by scraping algae from the substrate (Ref. 26993).

Inhabits coral-rich areas of clear, protected reefs (Ref. 9710). Found in lagoon and seaward reefs (Ref. 90102). Feeds mainly on algae (Ref. 26993).

fisheries: commercial; aquarium: commercial

Scarus dimidiatus Bleeker

Scarus dimidiatus Bleeker, 1859, p. 17.—Schultz, 1958, p. 74, pl. 14A, B.

Characterized by having 5 or 6 median predorsal scales; 3 rows of scales on cheek, with 2 to 4 scales in ventral row; ii,12 pectoral rays, and lips not covering white teeth. Coloration consists of a conspicious arch-shaped light (green when alive) band from below corner of mouth to just under orbit, thence toward pectoral fin base; this band is bordered above behind eye by a broad dark brown band that curves downward to upper pectoral base; anterior half of body pale, posteriorly abruptly darker, beginning below, dorsal spines VI or VII; middorsal part of snout in front of eyes with a large squarish dark blotch; upper lip with a broad pale band; distal four-fifths of anal fins green when alive and basal one-fourth red; distal edge of dorsal fin dark, then submarginally a pale streak, the basal three-fourths darker.

Synonymy unchanged from Schultz (1958, p. 74).

Specimens: USNM 202518, Te Vega Expedition, Sta. 216, Darval Bay, Borneo, 2 February 1965, 3 spec., 116–137 mm.

RANGE.—Central and western Pacific Ocean.

Scarus globiceps Cuvier and Valenciennes

Scarus globiceps Cuvier and Valenciennes, 1839, p. 242.—Schultz, 1958, p. 75, pl. 14C; 1960, p. 247.—Kamohara, 1963, p. 13 [Japan].—Woodland and Slack-Smith, 1963, p. 45 [Heron Island].

Pseudoscarus spilonotus Kner, 1868, p. 352, pl. 9: fig. 26.—Ladiges, 1958, p. 169 [location of type].

Scarus pronus Fowler, 1899, p. 490, pl. 18: lower fig. 3.

Callyodon globiceps.—Smith, 1956, p. 14, pl. 44L; 1959, p. 279, pl. 44L.—Marshall, 1965, p. 323.

Characterized by having 5 or 6 median predorsal scales, 3 rows on cheek with 2 or 3 scales in ventral row; ii,12 pectoral rays; lips almost covering white teeth, green in large adults; coloration of body of adults generally bluish green, center of scales green on posteroventral sides of body, anterodorsally scales with few to several small green spots; lower half of head below eye green; pale streak from middle of snout to eye separates green streak above from the green snout below pale streak; base of pectoral purplish black; black ocellate spot near bases of dorsal spines III or IV, in the drab color phase may be absent in large adults; outer third of anal fin dusky (green when alive), center pale (red when alive) and base with dusky (green) spots between rays, dorsal fin of similar coloration.

RANGE.—Central and western Pacific Ocean and Indian Ocean.

分布於西太平洋區，由印尼到美屬薩摩亞，北至琉球群島，南至大堡礁。台灣發現於南部、綠島及蘭嶼等。

主要捕獲的漁法是延繩釣、一支釣、流刺網及籠具等，而本種魚亦是潛水鏢魚的對象以及水族館展示魚種。

體延長而略側扁。頭部輪廓呈平滑的弧型。後鼻孔並不明顯的大於前鼻孔。齒板之外表面平滑，上齒板幾被上唇所覆蓋；齒板上無犬齒；每一上咽骨具1列臼齒狀之咽頭齒。背鰭前中線鱗約4；頰鱗3列，上列為6鱗；中列為5鱗；下列為1-2鱗。胸鰭具14軟條；尾鰭圓形或截形。初期階段(IP, Initial phase)的雌魚體色為黃褐色，於腹部漸趨於白色，體側上部有3-4條鮮麗的深灰褐色橫紋，體側下部有3條白色縱紋，由鰓蓋後緣延伸至臀鰭前緣；下吻部到腹鰭基部之區域為粉紅色。終期階段(TP, Terminal phase)的雄魚體色，頭部後上方至背鰭第VII硬棘之基部，以及前吻部之位置，均有一片三角形之鮮藍綠色色區，於此之後則為藍綠色；另具一條藍綠色之條紋，由眼區斜向胸鰭基部，並有一條粉紅色條紋與其聯結，其下方為鮮麗的藍綠色。

主要棲息於珊瑚礁繁盛的清澈區域或有遮蔽的礁區。主要以藻類為食。

Scarus dimidiatus, also known as the yellowbarred parrotfish, is a marine ray-finned fish, a parrotfish from the family Scaridae. It is found in the western Pacific Ocean from Indonesia east to Samoa as far north as the Ryukyu Islands and as far south as the Great Barrier Reef.