Sphenotrochus (Sphenotrochus) imbricaticostatus Cairns in Cairns & Keller, 1993

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

publication ID

https://dx.doi.org/10.3897/zookeys.1066.69697

publication LSID

lsid:zoobank.org:pub:133CE040-A5AF-44F1-BC9A-558C2F06A8AA

persistent identifier

https://treatment.plazi.org/id/B1521CC3-BDCB-575D-2A1B-D2E2CB52E4E8

treatment provided by

ZooKeys by Pensoft

scientific name

Sphenotrochus (Sphenotrochus) imbricaticostatus Cairns in Cairns & Keller, 1993
status

 

Sphenotrochus (Sphenotrochus) imbricaticostatus Cairns in Cairns & Keller, 1993  

Fig. 15M, N View Figure 15

Sphenotrochus aurantiacus   . - Boshoff 1981: 38-39 (in part).

Sphenotrochus (Sphenotrochus) imbricaticostatus   Cairns in Cairns & Keller, 1993: 258-259, fig. 9A-H.

Type locality.

Off Kosi Bay, South Africa (RV 'Meiring Naude’ stn. ZB27: 27°03'00"S 32°53'00"E); 44 m ( Cairns and Keller 1993).

Type material.

The holotype and eight paratypes are deposited at the NMNH, whilst one paratype is deposited at the SAM ( Cairns and Keller 1993).

Material examined.

SAMC_A090084 (1 specimen): Southern margin, 22 km from Cape Point / 4 km off Elsies Estuary, 34°09'59.99"S, 18°27'29.99"E; 24 m. GoogleMaps   SAMC_A090085 (in part: 12 specimen): Locality data unknown; 43 m. SAM_H3203 (in part: 2 specimens): Southern margin, 48 km from Kidds Beach / 14 km off Bira Estuary, 33°29'24.00"S, 27°22'59.99"E; 80 m. GoogleMaps   SAM_H4586 (2 paratypes): Eastern margin, 31 km south of Ponta Do Ouro / 32 km off Kosi-Kumpungwini (Sifungwe) Estuary, 24°48'00"S, 34°59.00"E; 42 m.   USNM-91715 (holotype): Eastern margin, 23 km south of Ponta Do Ouro / 15 km off Kosi-Kumpungwini (Sifungwe) Estuary, 27°03'32.40"S, 32°52'59.99"E; 44 m. GoogleMaps   USNM-91717 (2 paratypes): Eastern margin, 38 km from Shaka’s Rock / 16 km off Zinkwasi Estuary, 29°21'00.00"S, 31°34'59.99"E; 57 m. GoogleMaps  

Description.

Corallum cuneiform, with highly compressed faces in lower corallum. Upper corallum highly flared, producing a rectangular-like side view. Base slightly rounded. Calice elliptical (GCD:LCD = 1.4-2.8). Largest specimen examined (USNM-91717) 3.7 × 2.5 in CD, and 6.7 mm in H. Costae smooth, flat, unequally in width, and ridged. In some specimens 12-14 costae overreach base and meet counterparts from opposite side. Pairs of C4 occur in each half-system adjacent to two S1 (32 costae), but S4 does not correspond to C4. Intercostal striae narrow, being slightly wider than costae. Corallum light brown.

Septa hexamerally arranged in three cycles according to the formula: S1-2 > S3 (24 septa). S1-2 moderately exsert, equal in width, and extending 4/5 distance to columella with thickened and vertical axial margins. S3 equally exsert, but ¾ the width of S1-2. S3 axial margin narrow, straight to sinuous. Columella composed of a sharp-edged lamella that rises as high as septa. Columella and all septal faces covered by slender spines, giving them a rough appearance.

Distribution.

Regional: Southern and Eastern margin of South Africa, off Cape Point extending towards Kosi-Kumpungwini (Sifungwe) Estuary (23 km south of Ponta Do Ouro: Mozambique); 24-80 m. Elsewhere: south-eastern Mozambique ( Cairns and Keller 1993); 37-347 m.

Remarks.

Sphenotrochus (S.) imbricaticostatus   differs from the two other South African species in the subgenus ( S. evexicostatus   and S. aurantiacus   ) by its compressed rectangular cuneiform corallum and wide, flat, imbricate costae, which alternates in width and imbricate with edges of adjacent costae ( Cairns and Keller 1993).

Kingdom

Animalia

Phylum

Cnidaria

Class

Anthozoa

Order

Scleractinia

Family

Turbinoliidae

Genus

Sphenotrochus

Loc

Sphenotrochus (Sphenotrochus) imbricaticostatus Cairns in Cairns & Keller, 1993

Filander, Zoleka N., Kitahara, Marcelo V., Cairns, Stephen D., Sink, Kerry J. & Lombard, Amanda T. 2021
2021
Loc

Sphenotrochus (Sphenotrochus) imbricaticostatus

Cairns in Cairns & Keller 1993
1993
Loc

Sphenotrochus aurantiacus

von Marenzeller 1904
1904