Ovabunda biseriata (Verseveldt & Cohen, 1971)

Halasz, Anna, McFadden, Catherine S., Aharonovich, Dafna, Toonen, Robert & Benayahu, Yehuda, 2014, A revision of the octocoral genus Ovabunda Alderslade, 2001 (Anthozoa, Octocorallia, Xeniidae), ZooKeys 373, pp. 1-41: 14-17

publication ID

http://dx.doi.org/10.3897/zookeys.373.6511

persistent identifier

http://treatment.plazi.org/id/3B637D25-768B-D51D-09E1-7F98151502DC

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ZooKeys by Pensoft

scientific name

Ovabunda biseriata (Verseveldt & Cohen, 1971)
status

 

Ovabunda biseriata (Verseveldt & Cohen, 1971)   Figs 8 View Figure 8 ,9 View Figure 9

Xenia biseriata   Verseveldt & Cohen, 1971: 60, table 1; Benayahu 1990 table 1 listed only; Reinicke 1997: 33, plate 20.

Xenia obscuronata   Verseveldt & Cohen, 1971: 60, table 1, fig 10; Benayahu 1990 table 1 listed only; Reinicke 1997: 33, 35, plates 2, 4, 7, 21.

Ovabunda biseriata   ; Alderslade 2001: 51; Aharonovich and Benayahu 2011.

Ovabunda obscuronata   ; Alderslade 2001: 5, syn. n.

Material.

Holotype and five paratypes: HUJ I Co. 72, northern Red Sea, Gulf of Aqaba, Marsa Murach (29°25'34.44"N, 34°50'10.46"E), 1-4 m, 15 September 1969, coll. Y. Cohen; holotype of Ovabunda obscuronata   HUJ I Co. 120, northern Red Sea, Gulf of Aqaba, Ras el Muqebla (29°24'1.20"N, 34°48'41.99"E), 12 m, 16 August 1971, coll. Y. Cohen; holotype of Xenia ternatana   SMF 43, Indonesia, Ternate island, 1894, coll. Kükenthal.

Description.

The holotype is 28 mm high, stalk is 15 mm long, 11 mm wide at its base and 10 mm wide at the uppermost part; it is attached to the skeleton of a stony coral. Polyp’s body reaches up to 8-10 mm, and the tentacles 6-7 mm, bearing pinnules up to 1 mm long and 0.24 mm wide, separated by less than a pinnule-width. Two rows of pinnules are aligned along each of the tentacles margins, with 13-15 pinnules in the outermost row. There are numerous sclerites, abundant in all parts of the colony except for the mid-line of the oral side of the tentacles, where they are scarce. The sclerites are Ovabunda   -type ( Fig. 8 View Figure 8 ), measuring 0.013-0.029 × 0.018-0.039 mm in diameter (n = 100 sclerites). Rarely, two sclerites are fused, reaching a maximum diameter of 0.048 mm and occasionally 0.060 mm. The paratypes are of similar size to the holotype, featuring tentacles with two rows of pinnules and 13-16 pinnules in the outermost row. The stalk of the smallest paratype is divided into two branches; the paratype tentacles bear two rows of pinnules with 10-12 pinnules in the outermost row. The sclerites of all paratype colonies are Ovabunda   -type, ranging 0.018-0.025 × 0.023-0.039 mm in diameter. The original description of the species indicated non-pulsating polyps in live colonies. The preserved colonies are yellowish-light beige in colour.

Remarks.

In general the original description of the species corresponds to the current findings. SEM micrographs of the holotype sclerites ( Fig. 8 View Figure 8 ) indicate that they are indeed Ovabunda   -type, and therefore further confirm the previous assignment to that genus ( Alderslade 2001; Aharonovich and Benayahu 2011). The number of rows of pinnules, the number of pinnules in the outermost row, and the dimensions of the holotype colony of Ovabunda obscuronata   (HUJ I Co. 120) correspond to the original description by Verseveldt and Cohen (1971). The sclerites are oval spheroids, Ovabunda   -type, ranging 0.012-0.026 × 0.018-0.041 mm in diameter ( Fig. 9 View Figure 9 , n = 61 sclerites). Rarely, two sclerites are fused, reaching a maximal diameter of 0.060 mm. The original description indicated a maximum diameter of 0.045 mm for the stalk sclerites, 0.060 mm for those of the anthocodiae and "irregular spicules" in the tentacles ( Verseveldt and Cohen 1971: 60). The latter probably referred to fused sclerites, which were not identifiable under light microscopy. The original description of Ovabunda obscuronata   indicated non-pulsating polyps in live colonies, similar to Ovabunda biseriata   . The ethanol-preserved holotype is light brown in colour.

Reinicke (1997) noted under the description of Xenia obscuronata   (p. 33): "nec Xenia ternatana   ; Kükenthal 1913: 8 (in part)". The type of Xenia ternatana   was examined during the present study and its features do not agree with those of Ovabunda obscuronata   . Xenia ternatana   features platelets composed of dendritic rods, measuring up to 0.022 mm in maximal diameter. It should be noted that the description of Xenia ternatana   by Kükenthal also does not correspond to the features of Ovabunda obscuronata   .

Conclusions.

Examination of the holotype of Ovabunda biseriata   and Ovabunda obscuronata   revealed certain similarities, as already noted in the original description ( Verseveldt and Cohen 1971): two rows of pinnules, with 12-15 vs. 14-16 pinnules, respectively, in the outermost row. The original description noted differences in the size of sclerites; 0.018-0.035 mm in Ovabunda biseriata   vs. 0.045 mm in the stalk and anthocodiae and 0.060 mm in the tentacles of Ovabunda obscuronata   . The current examination revealed a similar size range in the two species (0.013-0.029 × 0.018-0.039 vs. 0.012-0.026 × 0.018-0.041, respectively). Therefore, it is concluded that Ovabunda biseriata   and Ovabunda obscuronata   are in fact synonyms, giving alphabetical priority to the former.

Similar species.

Ovabunda biseriata   is most similar to Ovabunda impulsatilla   and Ovabunda faraunensis   . Although they all have two rows of pinnules and non-pulsating polyps in living colonies, the number of pinnules in the outermost row ranges from 13-16 in Ovabunda biseriata   compared to 8-11 in Ovabunda impulsatilla   and 17-24 in Ovabunda faraunensis   .

Distribution.

Red Sea: Gulf of Aqaba, Gulf of Suez, Sudan.

Kingdom

Animalia

Phylum

Cnidaria

Class

Anthozoa

Order

Alcyonacea

Family

Xeniidae

Genus

Ovabunda

Loc

Ovabunda biseriata (Verseveldt & Cohen, 1971)

Halasz, Anna, McFadden, Catherine S., Aharonovich, Dafna, Toonen, Robert & Benayahu, Yehuda 2014
2014
Loc

Xenia biseriata

Verseveldt & Cohen 1971
1971
Loc

Xenia obscuronata

Verseveldt & Cohen 1971
1971