Dendrophyllia dilatata van der Horst, 1927

Filander, Zoleka N., Kitahara, Marcelo V., Cairns, Stephen D., Sink, Kerry J. & Lombard, Amanda T., 2021, Azooxanthellate Scleractinia (Cnidaria, Anthozoa) from South Africa, ZooKeys 1066, pp. 1-198 : 1

Dendrophyllia dilatata van der Horst, 1927

Fig. 8M, N

Dendrophyllia dilatata van der Horst, 1927: 2-3, figs 2-4. - Zibrowius and Gili 1990: 44. - Cairns and Keller 1993: 278-279. -Cairns 1994: 89. - Cairns 2001: 34.

Type locality.

Off Richards Bay, South Africa (RV 'Pieter Faure’ stn. 12103: ca. 28°47'00.0"S, 32°20'00.0"E); 97 m ( van der Horst 1927).

Type material.

The holotype is deposited at the ZMA ( Creuwels 2020).

Material examined.

SAMC_A073016 (2 specimens): Eastern margin, 31 km from Richards Bay / 46 km Mlalazi Estuary, 29°00'54.00"S, 32°15'35.99"E; 500 m. SAMC_A073068 (1 specimen): Eastern margin, 47 km from Cape Vidal / 28 km off Mgobezeleni Estuary, 27°43'11.99"S, 32°40'36.11"E; 100 m.

Description.

Colony unattached and arborescent, with sympodial branching formed by extra-tentacular budding. Corallum ceratoid to sub-cylindrical, straight to slightly curved. Largest specimen examined (SAMC_A073016) 105.5 mm in H, with ≤ 30 corallites. Calice elliptical (GCD:LCD = 0.9-1.2), with serrated calicular margin. Epitheca absent. Costae well developed at upper corallum, rounded, granular, non-perforate, and separated by thin, porous, intercostal striae. Corallum white.

Septa hexamerally arranged in four complete cycles according to the formula: S1-2 > S4 > S3 (48 septa). S1-2 both independent, reaching the columella with straight axial margins, which may also be finely serrated. S1 most exsert, followed by S2. S3 ~ 1/3 the width of S2. S4 slightly wider than flanked S3, arranged in Pourtalès plan: in each half-system a pair of S4 fuses before S3 with jaggedly dentate axial margins. Fossa deep, containing a large, and slightly raised spongy columella.

Distribution.

Regional: Eastern margin of South Africa, off Richards Bay towards Cape Vidal; 97-500 m. Elsewhere: Mozambique ( Cairns and Keller 1993); 97-132 m.

Remarks.

Dendrophyllia dilatata resembles Dendrophyllia sp. 1 in its growth form: i.e., large, dendroid colonies with fairly regular sympodial arranged corallites (Cairns 1994). However, it can be distinguished by having four cycles of septa as compared with three ( Dendrophyllia sp. 1), a well-developed Pourtalès plan development (poorly developed in Dendrophyllia sp. 1), lacking P2 which is present in Dendrophyllia sp. 1, and a larger columella (smaller in Dendrophyllia sp. 1).

Figures

Figure 8. A, B Balanophyllia (Balanophyllia) diffusa A (USNM 91782, off Port St. Johns, 138 m) calicular view B (USNM 91780, off Kosi Bay Estuary, 74 m) calicular view C, D Balanophyllia (Balanophyllia Balanophyllia) sp. cf. Balanophyllia Balanophyllia malouinensis C (SAM _ H 3069, off East London, 146 - 238 m) calicular view D (SAM _ H 3068, off Mazeppa Bay, 174 m) lateral view E, F Balanophyllia (Eupsammia) stimpsonii (SAM _ H 3831, off Cape Point, 97 - 99 m) E calicular view F lateral view G, H Dendrophyllia arbuscula (SAMC _ A 073119, off Cape Vidal, 65 - 70 m) G calicular view H lateral view I, J Dendrophyllia cladonia I (SAM _ H 1445, off Plettenberg Bay, 146 m) calicular view J (SAM _ H 2833, off Gonubie, 155 m) lateral view K, L Dendrophyllia cornigera K (USNM 91827, off Durban, 232 m) calicular view L (SAM _ H 3841, off Pringle Bay, depth unknown) lateral view M, N Dendrophyllia dilatata (SAMC _ A 073016, off Richards Bay, 500 m) M calicular view N lateral view O, P Dendrophyllia ijimai O (USNM 91844, off Shaka's Rock, 68 - 70 m) calicular view P (SAMC _ A 090121, off Port Dunford, 85 m) lateral view. Scale bars: 10 mm (A - I, K, M, O); 100 mm (J, L, N, P).