INTRODUCTION

More than 285 species have been assigned to genus Echinolampas (Roman, 1965). Due to the very large numbers of species, several attempts have been made to subdivide this genus into subgenera or sections. Lambert and Thiery (1921) divided this genus into eight sections, distinguished on variable characters, as evidenced by the fact that different specimens of one species have been assigned to more than one section (Kier 1957). Smith (2013) divided Echinolampas into four subgenera, using reliable characters.

A sea urchin was collected from Gapado Island which is nearby Moseulpo in Jejudo Island, Korea at 140 m deep with fishing nets on 30 June 2010. The collected specimen was preserved in 95% ethanol and was deposited in the Marine Echinoderm Resource Bank of Korea (MEBRK), Sahmyook University, Seoul, Korea. The morphological features were photographed using a stereo microscope (Nikon SMZ1000, Nikon Co., Tokyo, Japan) and digital camera (Nikon D7000). This specimen was classified as Echinolampas koreana H.L. Clark 1925 belonging to family Echinolampadidae of order Echinolampadoida based on its morphological characteristics, and was re-described with illustrations. A morphological identification of Echinolampas specimen collected was performed in this study.

SYSTEMATIC ACCOUNTS

Class Echinoidea Leske, 1778

Subclass Euechinoidea Bronn, 1860

Infraclass Irregularia Latreille, 1825

Order Echinolapadoida Kroh and Smith, 2010

만두등성게목 (신칭)

Family Echinolampadidae Gray, 1851

만두등성게과 (신칭)

Test circular to ovate with flattened ventral side. Ambulacra petaloid aborally, ambulacral plates beyond petals with single pores. Phyllodes widened adorally, with an inner and outer series of pores. Buccal pores present, opening at edge of peristome.

Genus Echinolampas Gray, 1825 만두등성게속 (신칭)

Test medium size, domed with relatively flat dorsal side. Petals straight or bowed and open distally. Two columns of pore-pairs in each petal of unequal lengths. Phyllodes short but developed, with two or three series in each half ambulacrum. Peristome subcentral. Periproct transverse.

Type species. Echinanthus ovatus Leske, 1778.

Echinolampas koreanaH.L. Clark, 1925 한국만두등성게 (신칭) (Fig. 1A-F)

Echinolampas koreanaHL Clark, 1925: 183, pl. 10, figs. 4, 5; Mortensen, 1948: 281, pl. 4, fig. 9; Kier and Lawson, 1978: 78; Kroh, 2015: 513238.

Material examined: 1 specimen, Gapado, Jejudo Island, 30 June 2010, at 140 m deep with fishing net.

Description: Abactinal system only 17 mm from anterior margin of test, closely tuberculated, with four large genital pores. Petals I and V with outer poriferous area about 21 mm. long, with 35 or more pore-pairs, and inner only about 12 mm with 24 or more pore-pairs. Petals II and IV with posterior poriferous area about 18 mm with 36 or more porepairs and the anterior about 11 mm with 23 or more porepairs. Petal III has left-hand poriferous area about 17 mm with some 30 pore-pairs, and right-hand area a little shorter, but with about same number of porepairs. Tuberculation rather fine, about 50 primary tubercles of 25 mm. Perifroct somewhat sunken, below ambitus, and overhung by test on its upper margin. Peristome very small, only 3.5 mm, wide, very deeply sunken. Ophiocephallous and tridentate pedicellariae present.

Size: Test length 76 mm, width 66 mm and height 33 mm. Color: Body color was light purple in alcohol.

Distribution: Korea (Jejudo Island), Japan (Korea Strait, eastern channel between South Korea and southwest Japan). Deposition: These specimens were deposited in the Marine Echinoderm Resource Bank of Korea (MEBRK), Sahmyook University, Seoul, Korea.

Remarks: This species was firstly collected only one specimen in adjacent water of Ojika Island (33°14′N, 128°53′E) in Japan side of Korea Strait by H.L. Clark (1925). Nevertheless it was denominated as Echinolampas koreana. And only one specimen was collected with fishing net at 140 m deep of Gapado which is a southern island near Moseulpo of Jejudo Island in June 2010. This order and lower categories such as family and genus are newly recorded from Korea, and this species is newly reported in marine fauna of Korea.