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NUMBER 557 73
Flabellum (F.) politum Cairns, 1989
PLATE yia-c
Flabellum pavoninum paripavoninum.—Yabe and Eguchi, 1942a:91-93 [in
part: Soyo Afarn-419, pi. 5: fig. 8a-c]; 1942b: 129-130 [in part: pi. 11: fig.
9a-c].
Flabellum politum Cairns, 1989a:53-54, pi. 28: figs, a-f [synonymy].
DISCUSSION.—The 10 specimens reported herein are either
juvenile or poorly preserved coralla collected when dead. Aside
from the distributional records they contribute nothing to our
knowledge of this species. The reader is referred to Cairns
(1989a) for a complete description and illustration of F.
politum. It is distinguished from other Japanese species in the
subgenus by having highly sinuous septa; a smooth, lustrous
theca; and a very tall corallum, invariably taller than wide.
MATERIAL EXAMINED.—New Records: Alb-4903, 1,
USNM 40735; Alb4935, 1, USNM 40790; Alb-4936, 2,
USNM 40736; TM (KT9015, CB1-2), 4, ORI; TM (KT9015,
HK2), 1, USNM 92816; TM(KT9015, HK5), 1, USNM 92817.
Previous Records: Types of F. politum, USNM.
TYPES.—All types of F. politum are deposited at the USNM.
Type Locality: Alb-5391: 12° 13' 15"N, 124°05'03"E (Philippines),
216 m.
DISTRIBUTION.—Japan: Eastern Channel of Korea Strait off
southwestern Honshu; East China Sea off southern and
southwestern Kyushu, including off Fukue Island and Osumi
Retto; 70-402 m. Elsewhere: South China Sea, Philippines,
Banda Sea; 40-717 m.
Subgenus Flabellum (Ulocyathus) Sars, 1851
DIAGNOSIS.—Flabellum having a serrate (jagged) calicular
edge.
TYPE SPECIES.—Ulocyathus arcticus Sars, 1851 (= Flabellum
macandrewi Gray, 1849), by monotypy.
Flabellum (U.) deludens Marenzeller, 1904
PLATE 32d,e
Flabellum japonicum.— Marenzeller, 1888a:45-46.
Flabellum deludens Marenzeller, 19O4a:269-272, pi. 17: figs. 10, 10a.—Yabe
and Eguchi, 1932a:387; 1942a:101-103, pi. 5: figs. 9a,c, 10a,c, lla,c;
1942b: 135-136, pi. 12: fig. la-c—Eguchi, 1938: table 2; 1965:292. 2 figs;
1968:C44~45, pi. C22: figs. 4, 5; pi. C25: figs. 3. 4.—Utinomi, 1965:
256.—Eguchi and Miyawaki, 1975:58.—Cairns, I989a:55-56, pi. 29: figs.
a-f [synonymy].
?Flabellum cf. apertum.—Yabe and Eguchi, 1942a:89. pi. 5: fig. 12a,c;
1942b:136, pi. 12: fig. 3a-c.
DESCRIPTION.—Corallum highly compressed, with virtually
planar thecal faces joined at sharp, carinate thecal edges. Thecal
edge crests up to 2 mm in height and usually extend from
pedicel to calice. Angle of thecal edges, 115°-150°; inclination
of lateral faces, 44°-80°. GCDrLCD = 1.3-1.5. Largest
Japanese specimen examined (Alb-4915) 47.9 x 37.7 mm in
calicular diameter, however, Cairns (1989a) reported a larger
specimen from the Philippines of 53 mm GCD. Thecal faces
flat (unridged) and bear a uniform coarse granulation in
addition to chevron-shaped growth lines looped between all
costae but the C5. Calicular edge deeply lacerate, a tall (up to 6
mm), rectangular thecal extension corresponding to each Sy_2
and adjacent pair of S4 (S5 rarely developed adjacent to S^_2).
A smaller, triangular calicular apex up to 1.7 mm in height
corresponds to each S3. Theca and septa fragile. Base color
white, with reddish brown stripes corresponding to the C^_2
and occasionally the C3; septal faces of S1 _2 also reddish brown
near theca.
Septa hexamerally arranged in 5 cycles, the fifth cycle never
complete even in large specimens. Medium-sized specimens
(about 35 mm GCD) often have only 4 cycles of septa; larger
specimens have pairs of S5 that form adjacent to S3 up to a total
of 72 total septa. S5 rarely form adjacent to S^. S-i_2 equal in
size and have vertical, sinuous inner edges that define a deep,
narrow fossa. S3 about three-quarters width of an S1 and also
have sinuous inner edges. S4 half to three-quarters width of an
S3 and have free inner edges, not fused to adjacent S3 or the
columella. When present, S5 rudimentary. Lower, inner edges
of S^ form an elongate columella; inner edges of S3 barely
attain the columella.
DISCUSSION.—Flabellum deludens is compared to F.japonicus
in the account of the latter species. A more complete
synonymy and description of this species is found in Cairns
(1989a).
MATERIAL EXAMINED.—New Records: Alb-4933, 1,
USNM 40701; Alb-5091, 1, USNM 92832; Alb-5092, 3,
USNM 40760; Alb-5094, 2, CAS 16310 and 74992; YO69-3,
1, ORI; YO69-37-39, 1, USNM 92833; Tsuchida-197, 1,
USNM 92834; TM (KT7802, Z4), 1, USNM 92835; TM
(KT7811, OT1), 1, USNM 92836; TM (KT9015, BS2), 3,
USNM 92837; TM (KT9202, OS3), 1, USNM 92838. Previous
Records: Syntypes of F. deludens, ZMB; Soyo Maru-421,1,
TIUS 43443 (F. cf. apertum of Yabe and Eguchi, 1942a,b);
Philippine specimens (Cairns, 1989a), USNM.
TYPES.—Two syntypes of F. deludens are deposited at the
ZMB (#5086, 7086). Type Locality: Valdivia stations 185,
203: west of Sumatra, 614-660 m.
DISTRIBUTION.—Quite common off Pacific coast of Honshu
(from 36°16'N southward), Shikoku, and Kyushu; East China
Sea off southwestern Kyushu; Eastern Channel, Korea Strait;
Sea of Japan off southwestern Honshu; 115-783 m. Elsewhere:
Philippines, eastern Indian Ocean; 106-1035 m.
Flabellum (U.) japonicum Moseley, 1881
PLATE 32g,h
Flabellum japonicum Moseley, 1881:168-169. pi. 7: figs. 4, 4a: pi. 16: fig.
12.—Faustino, 1927:47-48, pi. 2: figs. 5, 6.—Yabe and Eguchi, 1942a:101.
pi. 7: fig. lla.c; I942b:136, pi. 12: fig. 2a-c.—Eguchi, 1968:C45, pi. C28: