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NUMBER 557 45<br />
spaces, and in having clavate, not triangular, septal teeth.<br />
ETYMOLOGY.—The species name frustum (Latin frustum,<br />
meaning "a bit," or "part"), refers to the corallum shape. In<br />
geometry, a frustum is the solid figure formed when the top of<br />
a cone is cut off by a plane parallel to the base, which is the<br />
shape of the corallum of this species.<br />
MATERIAL EXAMINED (Types).—Holotype: TM (KT9202,<br />
OS2), USNM 92668 (Plate \9a,b). Paratypes: TM (KT9202,<br />
OS2), 4, USNM 92669 (Plate \Sg-i), 1, ORI. Type Locality:<br />
3O°59TM, 13O°32"E (Osumi Strait, southern Kyushu),<br />
237-241 m.<br />
DISTRIBUTION.—Known only from the type locality.<br />
Suborder CARYOPHYLLIINA<br />
Superfamily CARYOPHYLLIOIDEA<br />
DIAGNOSIS.—See Part 1.<br />
Family CARYOPHYLLIIDAE<br />
Caryophyllia Lamarck, 1816<br />
Subgenus Caryophyllia (Caryophyllia) Lamarck, 1816<br />
DIAGNOSIS.—See Part 1.<br />
Caryophyllia (C.) japonica Marenzeller, 1888<br />
PLATES 4/, 19c-/<br />
Caryophyllia (C. japonica Marenzeller, 1888b: 16.—Yabe and Eguchi,<br />
1941b:102; 1942b:119, pi. 10: figs. 1-3.—Eguchi, 1965:285, 2 figs.;<br />
1968:C31-32, pi. Cl 1: figs. 4-6, 10-29; pi. C23: figs. 7-9; pi. C25: figs. 5,<br />
6; pi. C29: figs. 6, 7.—?Kikuchi, 1968:8, pi. 5: fig. 8.—Eguchi and<br />
Miyawaki, 1975:56.—Song, 1982:134, pi. 2: figs. 3-5; 1988:27, pi. 3: figs.<br />
9-11; 1991:132-133.<br />
Caryophyllia ephyala.—Yabe and Eguchi, 1932a:388, 389.<br />
Caryophyllia arcuata.—Yabe and Eguchi, 1936:167.—Eguchi, 1938, table 2.<br />
Caryophyllia alaskensis.—Keller, 1981a:21 [in part: Vifyaz-2078, 3353, 5592,<br />
5640], pi. 2: fig. 1.<br />
Caryophyllia ambrosia.—Keller, 198la: 15 [in part: V/ryaz-5638].<br />
DESCRIPTION.—Corallum robust, ceratoid to trochoid, and<br />
firmly attached by a relatively slender pedicel: PD:GCD =<br />
0.25-0.39. Calice circular to elliptical. Largest corallum<br />
examined (Alb-4982) 17.8 x 16.0 mm in calicular diameter and<br />
18.4 mm in height, with a pedicel diameter of only 6.7 mm.<br />
Theca thick. Cl-3 sometimes slightly ridged near calice;<br />
otherwise, costae are flat with low, rounded granules or<br />
porcellaneous in texture. Corallum white.<br />
Septa hexamerally arranged in 4 complete cycles according<br />
to the formula: S1_2>S3>S4. S^ moderately exsert (1.5-2.1<br />
mm) and have straight, vertical inner edges that merge with the<br />
columella low in fossa. S3 70%-75% width of Su2, less exsert<br />
(about 1 mm), and have sinuous inner edges. S4 less exsert and<br />
slightly less wide than S3. A crown of 12 slender, lamellar but<br />
sinuous pali occurs before the S3, each palus 1.5-2.0 mm in<br />
width.<br />
Fossa of moderate depth. Columella well developed,<br />
composed of a large elliptical field of 10-20 fused, twisted<br />
elements. The previous description was based primarily on<br />
specimens from Alb-4982 and the two syntypes.<br />
DISCUSSION.—Three species—Caryophillia japonica, C.<br />
alaskensis and C. arnoldi—form a closely related group that<br />
might well be considered as geographic subspecies of one<br />
species: C. japonica, known from Japan to the Commander<br />
Islands; C. alaskensis, from the Commander Islands (at<br />
shallower depths) to British Columbia; and C. arnoldi, from<br />
Prince William Sound, Alaska to the California Channel<br />
Islands. Caryophyllia japonica differs from the geographically<br />
adjacent C. alaskensis in much the same ways that C. arnoldi<br />
differs from C. alaskensis. Caryophyllia japonica has a more<br />
robust corallum; consistently 48, more highly exsert septa; and<br />
S4 that are only slightly less wide than the S3. Caryophyllia<br />
japonica is almost indistinguishable from its trans-Pacific<br />
cognate, C. arnoldi, differing only in having a narrower<br />
pedicel.<br />
MATERIAL EXAMINED.—New Records: Alb-4982, 13,<br />
USNM 82158, 2, ORI; Alb-5088, 1, USNM 92676; Alb-5093,<br />
1, USNM 92677; Academik Keldish-23\2, 4, IOM. Previous<br />
Records: 2 syntypes of C. japonica; specimens reported as C.<br />
alaskensis by Keller (1981a) from: Vityaz-2QH% (IOM), 3353<br />
(USNM 92678, Plate 19c,/), and 5640 (IOM); specimen<br />
reported as C. ambrosia by Keller (1981a) from V/fyaz-5638,<br />
IOM (Plate 40.<br />
TYPES.—Two syntypes (Plate \9d,g,i) of C. japonica are<br />
deposited at the NMW (8168). Type Locality: "Enosima,"<br />
Japan, depth unknown. Although there are several Enosima's<br />
(= Enoshima) listed in a Japanese gazetteer, the most likely is<br />
the one in Sagami Bay.<br />
DISTRIBUTION.—Throughout Japanese waters from Ishikari<br />
Bay, Hokkaido to southern Kyushu, including both Pacific and<br />
Sea of Japan coasts; off Cheju Island, Korea Strait and Sea of<br />
Japan off South Korea; Pacific coast of Kurile Islands;<br />
Commander Islands, Bering Sea; 77-1680 m, with a tendency<br />
to occur deeper in the northern range.<br />
Caryophyllia (C.) alaskensis Vaughan, 1941<br />
ACCOUNT.—See Part 1.<br />
Caryophyllia (C.) sp. cf. C. scobinosa Alcock, 1902<br />
PLATES 19/-/, 20a.*<br />
Caryophyllia scobinosa Alcock, 1902a:90; 19O2c:8, pi. 1: figs. 2. 2a.—Yabe<br />
and Eguchi. 1942b:119-120 [in part; not pi. 10: fig. 5].—Utinomi, 1965:<br />
254.—Eguchi, 1965:285. fig.—Cairns and Keller, 1993:235 [synonymy].<br />
Caryophyllia cf. scobinosa.—Utinomi, 1956:42.<br />
DESCRIPTION OF SPECIMENS FROM TM (KT7911, OT4).—<br />
Corallum ceratoid, free, and curved about 45. Corallum 10.4<br />
mm in calicular diameter, 17.9 mm in height, and 1.7 mm in<br />
pedicel diameter. Costae flat and granular, separated by narrow<br />
intercostal striae. Corallum white. Septa hexamerally arranged