Aetea anguina ( Linnaeus, 1758 )

Lee, Sue Yeon, Yoo, Jung Sun & Kim, Seung Tae, 2017, Three species of Genus Aetea (Bryozoa: Cheilostomata: Aeteidae) from Korea, Journal of Species Research 6, pp. 125-128 : 126-127

1. Aetea anguina ( Linnaeus, 1758) ( Fig. 1)

ḣşffinjḍNj

Sertularia anguina Linnaues, 1758: 816 .

Aetea anguina : Mawatari, 1952: 262; Ryland and Hayward, 1977: 44, fig. 13; Rho and Song, 1980: 149, pl. 1, figs. 1-3; Rho and Seo, 1990: 147; Seo, 1992: 143; 2005: 298, pl. 20; 2010: 11-12, fig. 1; Seo and Min, 2009: 19; Chae et al., 2016: 553 .

Material examined. Daegueulbido Island (Tongyeong), 25 June 2013 by SCUBA diving; Gukdo Island ( Tongyeong ), 25 June 2013 by SCUBA diving; Haengwon (JeJu), 4 June 2015 by SCUBA diving from 20- 25 m ; Gapado Island (JeJu), 5 June 2015 by SCUBA diving from 20-25 m ; Marado Island (JeJu), 5 Jul. 2015 by SCUBA diving from 20-25 m ; Baekdo Island ( Yeosu ), 27 Jul. 2016 by SCUBA diving from 10-20 m ; Yeoseodo Island ( Wando ), 29 Jul. 2016 by SCUBA diving from 10-20 m ; Gageodo Island ( Heuksan ), 12 Oct. 2016 by SCUBA diving .

Description. Colony white to light brown, mostly whitish, encrusting stone, rope, other bryozoans, creeping, formed with erect zooid from creeping stolon ( Fig. 1A). Erect portion of zooid in branching uniserial, 0.6-0.8 mm long, arising from each dilatation, with long stem ( Fig. 1B). Stem part thinly tubular, fragile, distinctly annulate. Distal region spoon-shaped, occupying 1/2 to 1/3 length, with frontal membrane facing downwards, punctate, porous dorsally, like a desk lamp, not annulated ( Fig. 1B, C).

Remarks. This species had been widely reported in shallow waters, and all materials observed in this study were collected at a depth of 25 m or less.

Distribution. Cosmopolitan, including Korea.

* 2. Aetea ligulata Busk, 1852 ( Fig. 2A, B) ƦḣşffinjḍNj (ṵḓ)

Aetea ligulata Busk, 1852: 31 , pl. 42; Prenant and Bobin, 1966: 89, fig. 21, IV, VI (cum syn.); Gordon, 1984: 39, pl. 8, E, F; Tilbrook et al.: 2001: 37, fig. 2A.

Material examined. NIBRIV0000811606, 30 July 2016, 27 m, southeast of Wando Island (Wando).

Description. Colony white, encrusting stone, creeping, delicate, formed with erect zooid from creeping stolon. Erect portion of zooid in branching uniserial, 0.6-1.4 mm long. Stem part cylindrical middle portion finely punctate, not annulate, but rather with smoothly round- ed, transverse corrugations ( Fig. 2A, B). Distal region comprising one-third length of erect portion, cylindrical, straight, not flexed ( Fig. 2A).

Remarks. This species is reported from Korea for the first time. Aetea ligulata is easily distinguished from A. anguina having annulate stem and spoon-shaped distal region.

Distribution. Widespread, including Korea.

* 3. Aetea truncata ( Landsborough, 1852) ( Fig. 2C, D) ÜƦḣşffinjḍNj (ṵḓ)

Anguinaria truncata Landsborough, 1852: 288 .

Aetea truncata : Hincks, 1880: 8, pl. 1, figs. 8-10, pl. 2, fig. 3; Prenant and Bobin, 1966: 86; Ryland and Hayward, 1977: 48, fig. 15; Hayward and Ryland, 1998: 104, fig. 18.

Material examined. NIBRIV0000811607, Eoyudo Island (Tongyeong), 23 July 2013 by SCUBA diving from 35 m in depth .

Description. Colony white, delicate, encrusting seaweed, formed with erect zooid from creeping stolon. Erect portion pointing straight upwards, extremity truncate, 0.6-0.8 mm long ( Fig. 2C). Stem part closely punctate, not striated or annulate ( Fig. 2D). Distal region occupying 1/2 to 1/3 length of erect portion ( Fig. 2C).

Remarks. This species is reported from Korea for the first time. Aetea truncata is differentiated from A. anguina and A. ligulata by the absence of annulations in the stem part.

Distribution. Cosmopolitan, including Korea.