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II. Bifacial.
4 . Fronds up to 10 mm thick, very broad , non-crispate. Ambulacra flat. Carinae mayor may not
be developed .. . .... . . ... .... ........... . . . ....... . . . . ... . ........ P. decussata
5. Fronds up to 5 mm thick, edges crispate, curled. Septo-costae low, larger and smaller ones
mayor may not alternate. Carinae not conspicuous . . .. .. . ...... .. .. .. .. ... . P. cactus
D. Corallum columnar.
6 . Corallites projecting at lower part of the corallum, mostly rounded .... ... .. P. maldivensis
E. Corallum branching.
7. Branches stout, keeled, angular. Carinae acute ........... .... . ........... P. divaricata
AgariciD
LophoYris
PO lJonu.
Pavona
Pavona explanlliata (LMAARCK), 1816
(Plate: 11 . Figs. 10. 11)
expla1/U/otQ 1816. LAMARCK. 244 (Type locality : Indian Ocean).
explanuJalQ 1860, MILNE EDWARDS (& HAIME), 69: pI. 011/2a. b.
explanu/otQ 1879. KLUNZINGER 1, 74 ; pI. 9/8.
explanu/atQ 1922, Y. d. HORST. 418; pI. 31 /9.
1971 . LOVA & SLOBODKIN . 123.
1976. PILLAI & SCHEER, 39 ; pI. 16/ 3 (synonymy).
1980. HEAD. 149. 449.
cf expkmu/otQ 1980, VERON & PICHON, 17: figs. 26-34 ; 732.733 above.
gardinen' ? 1922, v. d. HORST, 420; pI. 31/5,6.
1971. LOVA & SLOBODKIN. 123 .
KLUNZINGER (1879) recorded this species from Red Sea , later on LOVA & SLOBODKI (197 1) and
HEAD (1980) have collected it. We could study three specimens from the Maldives but only one from the
Red Sea , found at the Sanganeb Reef in a depth of seven meters.
After LAMARCK'S description (1816) P. explanulata is expanded and partly encrusting. But KLUN·
ZI GER (1879) states that the colonies are flat, encrusting or elevated in gibbosities, and his fig. 8, pI. 9,
shows such a hillocky growthform. This specimen comes very near to P. maldivensis, whose skeletal
variations are discussed in detail by GARD INER (1905). It needs further work to prove if these two species
are identical.
P. gardineri HORST (1922) is not far from P. explanulata and might turn out to be one and the same.
The calicular characters of P. explanulata and P. clavus DANA are very similar, particularly in the alternating
broad and narrow septa, but the two species differ in growthform.
M a terial:
Central R. 5.: P. Sud . Sa 99 (Sa nganeb R.J.
Distribution : Red Sea ; Aldabra; Madagascar (P ICHON, 1964); Mascarenes (FAURE, 1977);
Maldives; Ceylon; Andamans (PI LLAI, 1972); Cocos-Keeling Isis.; Funafuti (Ellice Isis.).
Pavona varians VER RILL, 1864
(Pl ate: 12, Figs. 1, 2)
Pavonia
PavonQ
Pavonia
Lopboseris
Pavonia
1864, VERRILL. 5S (Type locality: Hawaii).
lJ4Mons 1922. y . d. HORST. 419, pI. 31 / 3.4.
1952. CROSSLAND. 162 , pis. 13/ 1. 2,14/4.
1964. SCHEER. 428.
1971 . LOVA & SLOBODKIN. 123.
1974. SCHEER & PI LLAI , 29 (synonymy).
19 76. PILLAI & SCHEER. 40.
1980. VERON & PICHON . 26; figs. 47- 54; 735.
t 980. HEAD. 149.448.
percarinata 1883. RIDLEY. 2SB .
repens IB78. BRUEGGEMANN. 39S ; pI. 7/ 1.
repens 1879. KLUNZINGER 3. 7S; pI. 9/3.
1905. GARDINER, 946; pI. 90/9 - 11.