Leptoclinides dubius ( Sluiter, 1909 )

Monniot, Françoise & Monniot, Claude, 2001, Ascidians from the tropical western Pacific, Zoosystema 23 (2), pp. 201-383 : 287-288

publication ID

https://doi.org/ 10.5281/zenodo.5391440

persistent identifier

https://treatment.plazi.org/id/F57D87A3-FF89-316C-EBA7-FE2AFC7E1740

treatment provided by

Marcus

scientific name

Leptoclinides dubius ( Sluiter, 1909 )
status

 

Leptoclinides dubius ( Sluiter, 1909) View in CoL

Polysyncraton dubium Sluiter, 1909: 69 View in CoL . Type locality: Indonesia.

Leptoclinides dubius View in CoL – Monniot F. & Monniot C. 1996: 176, pl 3H, western Pacific.

MATERIAL EXAMINED. — Papua New Guinea. Louisiades, Calvados Island, Brooker Channel, 11°03.09’S, 152°28.62’E, 12 m (Sample: CRRF).

Leptoclinides madara Tokioka, 1953 View in CoL ( Figs 69 View FIG ; 70 View FIG ; 123B View FIG )

Leptoclinides madara Tokioka, 1953: 200 View in CoL , pl. 1, fig. 2; pl. 23, figs 1-6. Type locality: Sagami Bay . — Nishikawa 1990: 116, Japan sea .

MATERIAL EXAMINED. — Palau. Babeldaob, Ibobang, 7°30.58’N, 134°29.66’E, 10 m, 11. VI.1996 ( MNHN A2 LEP 73).

Papua New Guinea. New Ireland, S Coast, outside Kalili Harbour, 3°26.62’S, 151°56.00’E, 15 m, 11.IV.1993 ( MNHN A2 LEP 72). — Milne Bay Province, China Straits, 10°34.50’S, 150°40.73’E, 93 m, 10. VI.1998 (Sample: CRRF).

Philippines. Bohol Sea, Balicasag Island SW of Bohol, 9°31.26’N, 123°41.05’E, 13 m, 16.IV.1997 ( MNHN A2 LEP 74). — Bohol Sea, Balicasag Island SW of Bohol, 9°31.23’N, 123°40.98’E, 22.IV.1997 ( MNHN A2 LEP 76).

DESCRIPTION

The colonies are hard crusts, 5-10 mm thick, irregular in outline and variably pigmented. They have large white and orange patches and irregular black-green specks ( Fig. 123B View FIG ). The proportions of these colours are highly variable. The pigments are restricted to the surface layer of the colonies. The zooids are perpendicular to the colony surface.

Both siphons are long, with strong sphincters and without lobes at their rim ( Fig. 69A View FIG ). The thoracic musculature is longitudinal with eight to 10 well-spaced bundles. The branchial sac has numerous long stigmata, about 16 in the two first half rows and 15 in the two last half rows. There is no retractor muscle. The lateral thoracic organs are large, in cups at the level of the third transverse vessel. The abdomen is not folded under the thorax ( Fig. 69A View FIG ). It has an elongate shape; the oesophagus is long, and the mid-intestine is horizontal in contrast to the vertical foregut and hindgut. The testis follicles ( Fig. 69B View FIG ) are arranged in a rosette of three to six follicles with an average of four. They are covered by five to six turns of the sperm duct.

Larvae were present only in a colony from Papua New Guinea. They measure 0.75 mm for the trunk ( Fig. 69C View FIG ). They have three anterior adhesive papillae, two pairs of ampullae between them, and one dorsal and one ventral ampulla. On the left side only is an odd anterior protrusion at the base of the ampullae.

The spicules are large and stellate. The rays have chisel-like points; the spicules measure 75 µm for the largest ( Fig. 70 View FIG ).

REMARKS

The specimens correspond well to previous descriptions of the species’ colour and the anatomical characters. All Leptoclinides species are so similar in their zooids’ characters that it is difficult to decide if the present specimens belong to Tokioka’s species, but the colour pattern seems characteristic.

L. madara is widely distributed in the western tropical Pacific Ocean.

VI

Mykotektet, National Veterinary Institute

MNHN

Museum National d'Histoire Naturelle

LEP

All-Russian Research Institute of Plant Protection

Kingdom

Animalia

Phylum

Chordata

Class

Ascidiacea

Order

Aplousobranchia

Family

Didemnidae

Genus

Leptoclinides

Loc

Leptoclinides dubius ( Sluiter, 1909 )

Monniot, Françoise & Monniot, Claude 2001
2001
Loc

Leptoclinides madara

NISHIKAWA T. 1990: 116
TOKIOKA T. 1953: 200
1953
Loc

Polysyncraton dubium

SLUITER C. P. 1909: 69
1909
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