Molgula dione ( Savigny, 1816 ), Savigny, 1816

Monniot, Françoise, 2012, Some ascidians from the southern coast of Madagascar collected during the “ AtimoVatae ” survey, Zootaxa 3197, pp. 1-42: 39-41

publication ID

http://doi.org/ 10.5281/zenodo.246182

DOI

http://doi.org/10.5281/zenodo.4893833

persistent identifier

http://treatment.plazi.org/id/3055E11F-FFB6-FFB9-71A5-CB21FC076AF1

treatment provided by

Plazi

scientific name

Molgula dione ( Savigny, 1816 )
status

 

Molgula dione ( Savigny, 1816)  

( Figure 35 View FIGURE 35 )

Molgula dione Savigny, 1816: 93   153 Pl. 7 fig. 1. Monniot C. 2002: 115 View Cited Treatment fig 38 and synonymy, Yemen, Socotra Station. TA 56 ( MNN S 3 MOL.A 394)

The single specimen 5mm in diameter is spherical, covered with sand; the siphons are not visible at the surface. Removed from the tunic the edge of the siphons is cut into numerous thread-like lobes. The body wall is thin. The longitudinal muscular fibres issued from each siphon do not extend on the whole body length ( Fig. 35 View FIGURE 35 A). The transverse muscles are very thin. A velum is present in both siphons. The oral tentacles are large but poorly branched. The dorsal tubercle opens in a vertical slit; it is located in a deep V of the peripharyngeal band. The dorsal lamina is short. The branchial sac ( Fig. 35 View FIGURE 35 B) has 7 folds with the formula: right-E 3-6 - 5-6 - 6 - 5 - 2 -DL- 3-4 - 5 - 5 - 5 - 4 - 3 E left. The first dorsal fold on each side is very short. The double spirals are obvious at the top of the folds. Parastigmatic vessels are present. The gut is a long closed loop. The hepatic gland in a single lobe has round papillae. There is one gonad on each side ( Fig. 35 View FIGURE 35 A); the testis is against the proximal end of the ovary. The ovary is globular with a short oviduct. The sperm duct ends in a short tube protruding on the internal side of the ovary. The renal sac is oval and small.

All characters well correspond to previously collected specimens, the smallest number of branchial folds is attributed to a smaller size of the Madagascar specimens.

The species was previously recorded from the Red Sea and Yemen.

MNN

Musee National du Niger

Kingdom

Animalia

Phylum

Chordata

Class

Ascidiacea

Order

Pleurogona

Family

Molgulidae

Genus

Molgula

Loc

Molgula dione ( Savigny, 1816 )

Monniot, Françoise 2012
2012
Loc

Molgula dione

Monniot 2002: 115
Savigny 1816: 93
1816