Cerithidea moerchii

Habitat and ecology. On firm or sandy mud and stones of tidal flats, in the open or under mangroves; often at river mouths and in tidal creeks; among salt-tolerant grasses and Phragmites reeds behind mud flats; sometimes on trunks of mangroves including Kandelia and Rhizophora.

Sumber: The genus Cerithidea Swainson, 1840 (Gastropoda: Potamididae) in the Indo-West Pacific region

(Figures 2 E, 14 B, 15 J – AA)

Sumber: The genus Cerithidea Swainson, 1840 (Gastropoda: Potamididae) in the Indo-West Pacific region

Shell (Fig. 15 J – AA): H = 16.1 – 46.6 mm. Shape elongated conical (H / B = 2.08 – 2.94; SH = 3.0 – 4.04); decollate, 5 – 8 (13) whorls remaining; spire whorls moderately to well rounded, suture distinct; spire profile straight; 0 – 6 thick pale varices on spire; periphery rounded; moderate thickness. Adult lip slightly thickened and flared; apertural margin sinuous in side view; weak anterior projection adjacent to canal. Sculpture on spire of straight to slightly opisthocline axial ribs, becoming slightly curved (opisthocyrt) on last whorl, ribs rounded, interspaces 1 – 1.5 times width of ribs, 14 – 23 (34) ribs on penultimate whorl; axial ribs usually weak or absent after ventrolateral varix, but rarely up to 8 are present; spiral sculpture of 5 primary cords on spire whorls, of which anterior cords usually divide on later whorls to give 6 – 9 cords on penultimate whorl and up to 10 above periphery on final whorl, posterior cord adjacent to suture strongest and bearing small nodules (corresponding with, or up to twice as numerous, as axial ribs); intersection of axial ribs and spiral cords often giving cancellate effect; base with 8 – 10 ridges, merging with cords above rounded periphery. Ventrolateral varix a wide rib at 170 – 230 (150 – 330) °; 0 – 6 wide varices on spire. Surface with fine spiral microstriae on periostracum; surface dull when worn. Colour: white, fawn or pale brown, usually with dark brown spiral lines and bands; often a dark band at shoulder and on base, or single broad band from shoulder to periphery, or only spiral grooves dark brown, varices white; bands show through in aperture. Animal (Fig. 2 E): Head pale brown with cream spots; snout brown to black with cream spots, darker towards tip; tentacles fawn with dark rings, black at base, pinkish around eye; sides of foot grey to blackish brown with cream spots; sole of foot grey; mantle cream (ethanol-preserved specimens similar). Range (Fig. 14 B): S Japan to Vietnam. Records: Japan: Matsushima Bay, Miyagi Pref. (ANSP 241064); Yokohama (ANSP 49910); Yoshida R., Oiehama, Kasaoka city, Hiroshima Pref. (NHMUK 20130265); Imaizumi, Kagoshima Pref. (USNM 363689); Jigyo, Chuo-ku, Fukuoka Pref. (ANSP 418823); Ura, Tatsugou-cho, Amami city, Kagoshima Pref. (NHMUK 20130271); Waku-gawa, Gabui, Nakijin-son, Okinawa (NHMUK); Funaura Bay, Iriomote I. (NHMUK 20130270). S Korea: Suncheon Bay (Hong, Choi & Tsutsumi 2010); Jeju I. (Noseworthy et al. 2007). China: “ throughout Chinese coasts ” (Ma 2004: 37); Tolo Harbour, Hong Kong (NHMUK 20130263); Hainan (ZMSP). Taiwan: Tamshui R., Bali (NHMUK 20070387); Kenting National Park (Lee & Chao 2004). Vietnam: Tuan Chau I., Ha Long Bay (NHMUK); Lo R., Nha Trang (NHMUK); Long Hai (Thach 2005). An old record from Hakodate, in the south of Hokkaido (USNM unregistered) is unconfirmed. The localities Borneo and Labuan [Sabah] on specimens in NHMUK are considered to be incorrect.

Sumber: The genus Cerithidea Swainson, 1840 (Gastropoda: Potamididae) in the Indo-West Pacific region

Measurements. Up to 46.6 mm (Reid 2014). Ecological notes. Development with planktotrophic stage of 12 to 20 days (Reid 2014). Lives on firm or sandy mud and stones of tidal flats, in the open or under mangroves; often at river mouths and in tidal creeks; among salt-tolerant grasses and Phragmites reeds behind mud flats; sometimes on trunks of mangroves including Kandelia and Rhizophora (Reid 2014). In studied sites it was found on sediment surface between mangrove trees as well as on sand banks of streams. Relation to mangroves. Predominantly mangrove-associated.

Sumber: Cheсklist of gastropod molluscs in mangroves of Khanh Hoa province, Vietnam

Distribution in Vietnam. Northern-east coast, central coast (Reid 2014). General distribution. From south Japan to Vietnam (Reid 2014).

Sumber: Cheсklist of gastropod molluscs in mangroves of Khanh Hoa province, Vietnam