Leucetta chagosensis Dendy, 1913

Van, Rob W. M. & De, Nicole J., 2018, Calcareous sponges of the Western Indian Ocean and Red Sea, Zootaxa 4426 (1), pp. 1-160: 76-77

publication ID

https://doi.org/10.11646/zootaxa.4426.1.1

publication LSID

lsid:zoobank.org:pub:18929E20-5296-4458-8A8A-4F5316A290FD

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http://treatment.plazi.org/id/386CC616-DC39-A57D-FF67-8C37FCE3F844

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Plazi

scientific name

Leucetta chagosensis Dendy, 1913
status

 

Leucetta chagosensis Dendy, 1913 

Figs 43a–f View Figure , 44a–g View Figure

Leucetta chagosensis Dendy, 1913: 10  , pl. 1 fig. 6, pl. 4 fig. 2; Van Soest & De Voogd 2015: 51, figs 37a–f, 38a–d, with further synonyms.

Ascoleucetta sagittata Cavalcanti et al., 2013: 308  , figs 21–22; Van Soest & De Voogd 2015: 49, figs 36a–f.

Material examined. RMNHAbout RMNH Por. 9171, Saudi Arabia, Al Laith, Quita al Qursh (Shark Reef), 20.1327°N 40.0994°E, depth 7.8–9.1 m, scuba, coll. Diaa Youssef, field nr. KSA-51, 14 May 2013; RMNHAbout RMNH Por. 9621, Saudi Arabia, Jeddah, near Thuwal, Al Asoul, 22.265361°N 39.002139°E, coll. N.J. de Voogd, scuba, field nr. THU07/ JED116, 9 November 2014; RMNHAbout RMNH Por. 9637, Saudi Arabia, Jeddah, near Thuwal, Um Alsawi, 22.239306°N 38.985139°E, coll. N.J. de Voogd, scuba, field nr. THU08/JED137, 11 November 2014; RMNHAbout RMNH Por. 9638, Saudi Arabia, Jeddah, near Thuwal, Um Alsawi, 22.239306°N 38.985139°E, coll. N.J. de Voogd, scuba, field nr. JED138, 11 November 2014; RMNHAbout RMNH Por. 9676, Saudi Arabia, Jeddah, near Thuwal, Fsar, 22.229611°N 39.029028°E, scuba, coll. N.J. de Voogd, field nr. THU12/JED181, 13 November 2014; RMNHAbout RMNH Por. 10073, Maldives, Faafu Atoll, Wallino, 3.087472°N 72.9567°E, depth 15 m, scuba, coll. N.J. de Voogd, field nr. MADAbout MAD 02/MAS023, 16 February 2015; RMNHAbout RMNH Por. 10114, Maldives, Faafu Atoll, Route 66, 3.07825°N 72.976306°E, depth 20 m, scuba, coll. N.J. de Voogd, field nr. MADAbout MAD 09/MAS069, 20 February 2015; RMNHAbout RMNH Por. 10141, Maldives, Faafu Atoll, Sunny Reef, 3.144639°N 73.012667°E, depth 7 m, scuba, coll. N.J. de Voogd, field nr. MADAbout MAD 08/MAS099, 18 February 2015; RMNHAbout RMNH Por. 10144, Maldives, Faafu Atoll, Route 66, 3.07825°N 72.976306°E, depth 20 m, scuba, coll. N.J. de Voogd, field nr. MADAbout MAD 09/MAS105, 20 February 2015; RMNHAbout RMNH Por. 11601, Mauritius, Rodrigues, La Rampe, 19.65015°S 63,41323333°E, depth 18 m, scuba, coll. N.J. de Voogd, field nr. ROG001, 15 October 2016; RMNHAbout RMNH Por. 11656, Mauritius, Rodrigues, Mourouk Ebony, Castel Rock, 19.76203°S 63.46273°E, depth 10 m, scuba, coll. N.J. de Voogd, field nr. ROG060, 17 October 2016; RMNHAbout RMNH Por. 11657, Mauritius, Rodrigues, Mourouk Ebony, Castel Rock, 19.76203°S 63.46273°E, depth 10 m, scuba, coll. N.J. de Voogd, field nr. ROG061, 17 October 2016; RMNHAbout RMNH Por. 11658, Mauritius, Rodrigues, Mourouk Ebony, Castel Rock, 19.76203°S 63.46273°E, depth 10 m, scuba, coll. N.J. de Voogd, field nr. ROG062, 17 October 2016; ZMAAbout ZMA Por. 13480, Israel, Gulf of Aqaba, Coral Garden, in cave at 1.5 m depth, scuba, coll. M. Wunsch field nr. AQ139, 15 July 1998; ZMAAbout ZMA Por. 13624, Israel, Gulf of Aqaba, Shark Observatory, depth 15 m, scuba, coll. M. Wunsch field nr. RM201, 22 July 1998; ZMAAbout ZMA Por. 21468, Saudi Arabia, Abu Madai Reef, 22.0609°N 38.7679°E, depth 19 m, scuba, coll. J. On On Lee, field nr. 4–8, 14 April 2009; ZMAAbout ZMA Por. 12071, Seychelles, Amirantes, Alphonse Atoll, SE part of lagoon, 7.0333°S 52.7333°E, depth 6–8 m, scuba, coll. R.W.M. van Soest, field nr. NIOP-E stat. 788/08, 4 January 1993; ZMAAbout ZMA Por. 12442, Seychelles, Amirantes, Platte Island Atoll, lagoon, 5.8333°S 55.35°E, scuba, coll. R.W.M. van Soest, field nr. NIOP-E stat. 797, 7 January 1993; ZMAAbout ZMA Por. 16369, Madagascar, Nosy Bé, Ambariobé, N of Nosy Komba, reef, depth 6–8 m, scuba, coll. J.H. Stock, 28 December 1963; ZMAAbout ZMA Por. 16372, Madagascar, Nosy Bé, S of Nosy Tanga, reef, depth 7–9 m, scuba, coll. J.H. Stock, 1 January 1964; ZMAAbout ZMA Por. 19251, India, Lakshadweep, Minicoy, depth 20 m, scuba, coll. A. George IERSE, field nr. 91, 5 December 2004; ZMAAbout ZMA Por. 19279, India, Lakshadweep, Kavaratti, depth 22 m, scuba, coll. A. George IERSE, field nr. 20, 19 February 2005.

Description. Because we recently provided an extensive description of Indonesian specimens of this species (cf. Van Soest & De Voogd 2015), we treat it here in summary format. Habitus in situ ( Figs 43a–f View Figure ) is lobate, ovoid or irregularly massive, usually bright yellow in color (dull beige in preservation), with one or several prominent oscules with short rim. The oscule leads to a slit-like or more expanded atrial cavity. Surface optically smooth. Size of specimens up to 11 x 6 x 4 cm, often smaller. Consistency firm to hard.

Aquiferous system. Leuconoid.

Skeleton. ( Figs 44a–b View Figure ) The skeleton is formed by a dense mass of spicules surrounding the choanocyte chambers of the leuconoid aquiferous system. At the surface there are giant triactines in tangential position, numbers variable among individuals. The oscular rims are provided with smaller somewhat sagittal triactines, often with undulate paired actines. The atrial surface contains numerous tetractines, with their apical actines protruding into the atrial cavity.

Spicules. ( Figs 44c–g View Figure ) Giant triactines, smaller triactines, tetractines.

Giant triactines ( Fig. 44c View Figure ) with rather thin, sharply pointed actines, quite variable among the individuals, 480– 789 –1380 x 36 – 61.8 –114 µm.

Small triactines ( Fig. 44d View Figure ), similarly sharply pointed, 78– 153 –258 x 6 – 13.3 –23 µm. Sagittal triactines ( Fig. 44e View Figure ) of the oscular rim: 105– 123 –144 µm x 6 – 11.1 –17 µm.

Tetractines, with size and shape comparable to the small triactines, basal actines 121– 141 –180 x 8 – 11.3 –16 µm; apical actines, frequently with curved endings, 32– 87 –170 x 3 – 7.4 –12 µm.

Distribution and ecology. Seychelles, Red Sea, India, Maldives, Madagascar, Rodrigues; elsewhere throughout Indo-West Pacific tropical waters (see Wörheide et al. 2008; Van Soest & De Voogd 2015); common on reefs down to 25 m.

Remarks. The actines of the giant triactines in the Western Indian Ocean on average are larger and thicker than those reported for Indonesian specimens (compare with Van Soest & De Voogd’s 2015 measurements). However, the smaller spicules are similar in size, so a conclusion that there is a distinct regional difference is not (yet) warranted. We obtained several partial 28S sequences, both from Indonesian and from Rodrigues specimens.

We also obtained a sequence of the Indonesian holotype of Ascoleucetta sagittata Cavalcanti et al., 2013  . In our phylogenetic tree of Fig. 2C View Figure the latter ended up in a larger clade of Leucetta chagosensis  , closest to Indonesian specimens of that species. In a separate inspection of a trimmed alignment of 396 sites, the sequence of Ascoleucetta sagittata  was found to be identical to three Indonesian specimens (one additional Indonesian specimen had one site different). The three Indonesian sequences and the Ascoleucetta sagittata  sequence together differed in 2 sites from Western Indian Ocean specimens obtained from Rodrigues, and in 3 sites from the Maldives sequence of L. chagosensis  . These results confirm the already suggested synonymy (cf. Van Soest & De Voogd 2015) of L. chagosensis  and Ascoleucetta sagittata  .

The differences between sequences from the Western Indian Ocean (excepting the Maldives) and Red Sea sequences obtained from Oliver Voigt showed a consistent single size difference, Indonesian and Red Sea differences amounted to 2 sites.

A sequence of the Australian Leucetta villosa Wörheide & Hooper, 1999  downloaded from GenBank was also found to be included in the larger clade of L. chagosensis  (cf. Fig. 2C View Figure ). In the separate inspection mentioned above, the sequence of L. villosa  differed in five/four sites from Indonesian and Western Indian Ocean L. chagosensis  sequences. Because of the habitus differences (villous surface) this is interpreted as evidence of specific difference, indicating a possible species complex in L. chagosensis  s.l.

RMNH

National Museum of Natural History, Naturalis

MAD

Madras Museum

ZMA

Universiteit van Amsterdam, Zoologisch Museum

Kingdom

Animalia

Phylum

Porifera

Class

Calcarea

Order

Clathrinida

Family

Clathrinidae

Genus

Leucetta

Loc

Leucetta chagosensis Dendy, 1913

Van, Rob W. M. & De, Nicole J. 2018

2018
Loc

Ascoleucetta sagittata Cavalcanti et al., 2013 : 308

: 308