Truncatoflabellum inconstans (von Marenzeller, 1904a)

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

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

publication LSID

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

persistent identifier

http://treatment.plazi.org/id/646E062F-7866-C3E2-D96F-7080EC6C9D50

treatment provided by

ZooKeys by Pensoft

scientific name

Truncatoflabellum inconstans (von Marenzeller, 1904a)
status

 

Truncatoflabellum inconstans (von Marenzeller, 1904a)  

Fig. 12M, N View Figure 12

Flabellum inconstans   von Marenzeller, 1904a: 277-280, pl. 27, figs 11 A-L. - Boshoff 1981: 34.

Flabellum harmeri   . - Boshoff 1981: 35.

Truncatoflabellum inconstans   . - Cairns 1989b: 61. - Cairns and Keller 1993: 220. - Cairns 2016: 34, fig. 9D.

Type locality.

Off St. Francis Bay, South Africa (SS ' Valdivia   ' stn. 100: 34°08'09"S, 24°59'30"E); 100 m (von Marenzeller 1904a).

Type material.

The syntype are deposited at the ZMB (GBIF 2020).

Material examined.

ORI_DIIb2 (1 specimen): Locality data unknown. ORI_ DIIb3 (in part: 1 specimen): Locality data unknown, 27 m.   SAMC-A072990 (1 specimen), SAMC-A072991 (3 specimens): Locality data unknown. SAMC-A090103 (1 specimen): Southern margin, 15 km from Arniston / 21 km from De Mond-Heuningnes Estuary, 34°46'59.99"S, 20°19'00.00"E; 80 m. GoogleMaps   SAM_H1241 (in part: 1 specimen): Southern margin, 2 km from Kei Mouth / 27 km off Groot Berg Estuary, 32°40'33.99"S, 28°22'50.99"E; 66 m. GoogleMaps   SAM_H1381 (1 specimen): Eastern margin, 2 km from Durban / 8 km off Umgeni Estuary, 29°51'59.99"S, 31°00'00.00"E; 101 m. GoogleMaps   SAM_H1382 (2 specimens): Southern margin, 48 km from Cape Padrone / 47 km off Bakens River Estuary, 34°04'59.99"S, 26°05'59.99"E; 37 m. GoogleMaps   SAM_H1386 (1 specimen): Southern margin, 28 km from Gonubie / 27 km off Buffalo Estuary, 33°09'29.99"S, 28°03'06.00"E; 86 m. GoogleMaps   SAM_H1392 (2 specimens): Southern margin, 6 km from Kenton On Sea / 5 km off Boknes Estuary, 33°43'07.59"S, 26°37'37.95"E; 90 m. GoogleMaps   SAM_H1417 (1 specimen): Southern margin, 29 km from Kenton On Sea /off Boesmans Estuary, 33°53'39.99"S, 26°51'00.00"E; 121 m. GoogleMaps   SAM_H1425 (1 specimen): Southern margin, 7 km from East London / 5 km off Buffalo Estuary , 33°02'59.99"S, 27°57'00.00"E; depth unknown. SAM_H1434 (4 specimens): Locality data unknown. SAM_H1435 (1 specimen): Southern margin, 6 km from Kidds Beach / 5 km off Ncera Estuary, 33°11'59.99"S, 27°40'59.99"E; 79 m. GoogleMaps   SAM_H1444 (2 specimens): Southern margin, 14 km from Cape Padrone / 26 km off Boknes Estuary, 33°46'00.00"S, 26°19'00.00"E; 104 m. GoogleMaps   SAM_H1446 (1 specimen): Southern margin, 6 km from Kidds Beach / 5 km off Ncera Estuary, 33°11'59.99"S, 27°40'59.99"E; 79 m. GoogleMaps   SAM_H1470 (2 specimens): Eastern margin, 27 km from Mtunzini / 25 km off Matigulu Estuary, 29°10'36.00"S, 31°51'00.00"E; 115 m. GoogleMaps   SAM_H1511 (2 specimens): Southern margin, 25 km from Port Elizabeth / 23 km off Bakens River Estuary, 33°49'36.36"S, 25°47'42.94"E; 49- 183 m. GoogleMaps   SAM_H3071 (34 specimens): Southern margin, 6 km from Kenton On Sea / 5 km off Boknes Estuary, 33°43'07.59"S, 26°37'37.95"E; 90 m. GoogleMaps   SAM_H3130 (1 specimen): Southern margin, 46 km from Port Alfred / 12 km off Mgwalana Estuary, 33°29'24.00"S, 27°21'11.99"E; 80 m. GoogleMaps   SAM_H3155 (1 specimen): Southern margin, 47 km from Port Alfred / 14 km off Mgwalana Estuary, 33°30'18.00"S, 27°22'05.99"E; 80 m. GoogleMaps   DEFF_NANSEN-INV 19 (2 specimens): Eastern margin, 20 km from Durban / 19 km off Beachwood Mangroves; 29°52'56.39"S, 31°12'15.59"E; 218 m. GoogleMaps  

Imagery data.

BMNH 1939.7.20.816-833 (in part: 1 specimen): Southern margin, 7 km from East London/5 km off Buffalo Estuary, 33°02'59.99"S, 27°57'00.00"E; 62 m. BMNH-1950.1.10.97-102 (in part: 1 specimen): Locality data unknown. DTE 100 (syntype: 1 specimen): Southern margin, 12 km from Jeffreys Bay/21 km off Gamtoos Estuary, 34°08'53.99"S, 24°59'17.99"E; 100 m. Mortensen St 30 (2 specimens): Eastern margin, off Durban; 94 m. Mortensen St 31 (14 specimens): Eastern margin, off Durban; 128 m.

Description.

Corallum (anthocyathus) large, robust, and having a small open base. Calice elliptical to sub-cylindrical (GCD:LCD = 1.47-2.60), with a thin and smooth calicular margin. Basal scar 5.3-6.6 × 3.4-4.0 mm in diameter, with 24 complete septa originating from scar. Largest anthocyathus examined (SAM_H1386) 25.6 × 18.1 mm in CD and 37.4 mm in H. Theca bears fine longitudinal striae, and chevron-shaped growth lines. C1-3 distinct and extend from calicular margin to base. Thecal edge smooth, rounded, or acute. Thecal edge diverges in an angle between 45 and 55°, and thecal faces between 20 and 25°. Corallum white.

Septa hexamerally arranged in six cycles, last being incomplete, according to the formula: S1-3 > S4 > S5 > S6 (102 septa). However, smaller coralla (< 25 mm GCD) display ≤ 78 septa. S1-3 greater in width than S4, and having vertical, slightly sinuous, and thickened axial margins. S4 ~ ½ the width of S1-3, and bear sinuous axial margin, which sometimes appear to be dentate. S51/3 the width of S4, and have dentate axial margin. However, if S6 is absent, S5 rudimentary. S6 rudimentary. Septal faces covered with granules obliquely aligned in rows along septal margin. Fossa deep containing a rudimentary columella formed by S1-3 lower axial margin.

Distribution.

Regional: Southern to eastern margin of South Africa, off Jeffreys Bay extending towards Durban; 29-183 m. Elsewhere: Only known from South Africa.

Remarks.

The South African endemic Truncatoflabellum inconstans   differs from the other South African congeners by lacking thecal spines, in thecal edge and thecal face inclinations, GCD:LCD ratio, H:GCD ratio, number of septa, and distinction of ribbed C1-3 ( Cairns 2016). However, T. inconstans   may be mistaken with T. stabile   (von Marenzeller, 1904a); T. inconstans   differs in having a thecal edge angle inclination range of 40-50° (as opposed to the 60-90° range of T. stabile   ), and a H:GCD between 1.0-1.5 (compare with 0.7-1.1 of T. stabile   ) (key in Cairns 2016: 9).

Kingdom

Animalia

Phylum

Cnidaria

Class

Anthozoa

Order

Scleractinia

Family

Flabellidae

Genus

Truncatoflabellum

Loc

Truncatoflabellum inconstans (von Marenzeller, 1904a)

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

Flabellum harmeri

Gardiner 1929
1929
Loc

Flabellum inconstans

Marenzeller 1904
1904