珠螺

珠螺（學名：Lunella coronata，臺灣話：tsu-lê），臺灣澎湖當地俗稱大頭仔（臺灣話：tuā-thâu-á）、大頭螺仔（臺灣話：tuā-thâu-lê-á），是鐘螺目蠑螺科珠螺屬的一個腹足綱軟體動物物種^[2]。

珠螺
Five views of a shell of Lunella coronata
科學分類
界：	動物界 Animalia
門：	軟體動物門 Mollusca
綱：	腹足綱 Gastropoda
目：	鐘螺目 Trochida
總科：	鐘螺總科 Trochoidea
科：	蠑螺科 Turbinidae
屬：	珠螺屬 Lunella
種：	珠螺 L. coronata
二名法
Lunella coronata (Gmelin, 1791)
異名[2]
Lunella coreensis Recluz, 1853[1] Lunella coronata coronata (Gmelin, 1791) Turbo (Lunella) coronata (Gmelin, 1791) Turbo coronatus Gmelin, 1791 Turbo creniferus Gmelin, 1791 Turbo hemprichii Troschel, 1849 Turbo modestus Philippi, 1847 Turbo trochoides Reeve, 1848 Turbo viridana Röding, 1798

形態描述

The shell grows to a length of 4 cm, with conspicuous flattened, cup-like scales interspersed by small, regular rows of nodules. The colour of the shell is pale to greenish, flecked with purplish-brown markings (often encrusted with light pink coralline algae). The 螺厴 is smooth to faintly granular with pale green centre. (Richmond, 1997).

The solid, imperforate shell has a depressed-turbinate shape with a diameter greater than the altitude. It is covered with an irregular spiral series of nodules and granules, of which the subsutural series and two on the median portion of the body whorl（英語：body whorl） are more prominent. The spire（英語：Spire (mollusc)） is depressed, dome-shaped with an apex that is frequently eroded and red. The shell contains 4 to 5 whorl（英語：Whorl (mollusc)）s, the last very large. The large 殼口 is round and iridescent within. The wide columella（英語：Columella (gastropod)） is flattened and excavated, deflexed recurved and somewhat channelled at its base, The inside of the 螺厴 is flat, greenish and golden, iridescent, with about 5–6 whorls and a subcentral nucleus. Its outside is convex, greenish, sparsely granulate all over.

The species is subject to a wide variation. The passage from the strongly tuberculate forms into those in which the transverse striae simply cut the lirae into diamonds or granules is made by imperceptible degrees.^[3]

分佈

這個海洋生物分佈於非洲東南部的紅海海岸、馬斯克林群島及整個印度洋-太平洋海域，包括中國大陸^[1]、臺灣^[1]、香港。

棲息地

常棲息在沿海岩礫或岩礁的潮間帶及或潮池，以岩礁上的海藻生物為食^[1]

Closed eye of Lunella coronata; ep = epidermis; vm = vitreous mass