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Heterocyatbus aequicostatus MILNE EDWARDS and HAIME, 1848
HereTocyatbus aequicostotus
beterocostatus
oblongatus
parasiticu!
phi/ippinensis
pulcbelJus
UJood-masoni
(Plate 36, Fig. 9)
1848, MILNE EDWARDS & HAIME. 324 ; pI. 10/ 8 (Type locality : unknown),
1904 •. GARDINER. lOS: pI. )/1 - 43 (synonymy).
1905 , BOURNE. 193 and 213: figs. 2. 3: pis. 3/ 12- 18: 4/19-21.
1906. v. MAR ENZELLER. 90.
1909. HARRISON & POOLE. 898. pI. 8S / la- f.
1927. FAUSTINO. 83: pI. 8/ 1-7.
1974. SCHEER & PI LLAI. 6 I; pI. 28/ 3. 4 (synonymy).
1938. GARDINER & WAUGH. 187.
1892. REHBERG. 9: pI. 21 1. 2.
1872, SEMPER. 255 ; pl. 20/ 17a- c.
1872, SEMPER. 254 ; pI. 20/ 12- 14.
1892, REHBERG, 8; pI. I l7a, b.
1893, ALCOCK, 141 ; pI. 5/4, 4a.
Solitary, enclosing a gastropod shell. Basal part laterally with some small openings of the commensal
sipunculid (for details see FEUSTEL, 1966). Height up to 10 mm. Diameter of the calyx up to 12 mm.
Calices circular or oval, shallow (J to 2 mm). Septa in five cycles. Primaries and secondaries subequal, or
t he primaries may be more thickened and forming a six-rayed srar. All septa exsert, primaries the maximum.
Edges of larger septa entire, those of higher cycles serrated. Three cycles of septa reach the columella,
others unite with the lower cycles. Pali present before the first four cycles of septa, those of the primaries
are the largest and bi- or trilobed. Costae correspond to septa, those of the primary and secondary septa
prominent. Edges of costae granular.
The present samples are all small (2 to 9 mm in diameter), some are only attached to gastropods and
the latter are not enclosed at the base of the coral. The same is reported by GARDINER & WAUGH (1938)
of their H beterocostatus from southern Red Sea (depth 375 m, Stat. 207), which we consider as synonymous
with H aequicostatus.
Mat e rial :
Gulf of Aqaba: T. Aviv NS 13 55 , 5409 , 5415 , 5423 (Eilat), (each o. comprehends several
specimens).
Dis t rib uti 0 n : Red Sea; East Africa; Persian Gulf; Maldives ; Gulf of Mannar along the Indian
coast ; Ceylon; Andamans; Nicobars ; Mergui Archipelago; China Sea; Philippines; Japan; Eastern Pacific.
Rem ark s : The type of H wood-masoni ALCOCK is No. 5958/9 in the Indian Museum Calcutta.
The distinguishing feature of this is the prominence of the primary septa, forming a six-rayed star. SCHEER
& PILLAI (1974) had many specimens from the Nicobars (near the type locality of H wood-masoni), in
some of them this feature is very conspicuous (see pI. 28, fig. 3 of SCHEER & PILLAI). We feel that this
is only a skeletal variation, and H wood-masoni has no separate status.
Subfamily Oesmophyllinae VAUGHAN and WELLS, 1943
Genus Dactylotrocbus WELLS, 1954
T Y pes pee i e s : Tridacopbyllia cervicornis MOSELEY , 1881.
G e n e ric c h a rae t e r s : Solitary. Columella absent. Wall with two or more fingerlike prolongations.
Dactylotrocbus cervicornis (MOSELEY), 1881
(Fig. 3; PI. 40. Fig. 4, centre=)
Tridacopbyllill cervicornis 1881 , MOSELEY, 183 ; pI. 10/ 2, 2a- c, 3, h (Type! locality unknown).
Dactylotrocbus ceruicornis 1954 , WELLS, 470; pI. 178/ 1-3.
Tridacopbyllia primordialis 1899, GARDINER. 168 ; pI. 19/7.