WoRMS taxon details
Didemnum dicolla Monniot F. & Monniot C., 1997
212516 (urn:lsid:marinespecies.org:taxname:212516)
accepted
Species
marine, fresh, terrestrial
Monniot, F.; Monniot, C. (1997). Ascidians Collected in Tanzania. <em>Journal of East African Natural History.</em> 86(1), 1-35., available online at https://doi.org/10.2982/0012-8317(1997)86[1:acit]2.0.co;2
page(s): 6, figs. 3D, 5; pl. 1B [details] Available for editors
[request]
page(s): 6, figs. 3D, 5; pl. 1B [details] Available for editors
[request]
Holotype MNHN A2 DIC.C 396, geounit Menai Strait and...
, Note Stations: Tanzania, south of Zanzibar, Menai...
Type: MNHN A2 Did C 396. Djibouti, Mescha Island, 0 to 20 m (Monniot coll.) MNHN A2 Did C 397-401 (Monniot & Monniot, 1997). [details]
Holotype MNHN A2 DIC.C 396, geounit Menai Strait and Conwy Bay [details]
From editor or global species database
Type locality Stations: Tanzania, south of Zanzibar, Menai Bay, 6°24.48'S-039°24.64'E 1.5 m on sea grass bed (CRRF coll.)Type: MNHN A2 Did C 396. Djibouti, Mescha Island, 0 to 20 m (Monniot coll.) MNHN A2 Did C 397-401 (Monniot & Monniot, 1997). [details]
Description The red, orange, or rusty colonies form tough crusts on different kinds of substrates such as sea grass blades, shells, or...
Description The red, orange, or rusty colonies form tough crusts on different kinds of substrates such as sea grass blades, shells, or corals (pl. 1B). The common cloacal apertures appear as darker spots at the top of small swellings. The colony is of slight thickness, no more than 2 mm deep. The density of spicules makes the colony brittle. Pigments are limited to the colony surface. The common cloacal cavity is quite thin, restricted to the thoracic layer, making it difficult to delaminate the colony's upper surface. The zooids themselves have no special characteristics. The oral siphon is short with six triangular lobes (fig. 5A). The cloacal opening is not wide and no languet arises from its margin. There are six to eight branchial stigmata in a row. The vertically elongated lateral thoracic organs protrude from the rim of the cloacal aperture beside the third row of stigmata (fig. 5A). The retractor muscle is linked to the oesophageal peduncle (fig. 5A); its free length does not exceed the length of the thorax. The abdomen is folded on itself (fig. 5B, C). The gut loop bends at the level of the poststomach and rectum. The testis vesicle lies on the gut loop, covered by four to five turns of the sperm duct (fig. 5C). In colonies containing an ovary and larvae, the testis has disappeared (fig. 5B). Numerous larvae are incubated in the basal layer of the colonies. The larval trunks measure 330 um to 350 um long. The ocellus, otolith, and three rows of stigmata are developed. There are two adhesive papillae, and on each side sometimes five but more often seven pairs of elongated ampullae of unequal length (fig. 5D, E). The larvae are not gemmiparous. The spicules (fig. 3D) are stellate, the largest about 50 um across. The size of the spicules is, on an average, smaller in Tanzania than in Djibouti. The rays are very regularly placed on pentagonal bases. Their tips are either sharp or neatly truncated.
[details]
[details]
Shenkar, N.; Gittenberger, A.; Lambert, G.; Rius, M.; Moreira da Rocha, R.; Swalla, B.J.; Turon, X. (2024). Ascidiacea World Database. Didemnum dicolla Monniot F. & Monniot C., 1997. Accessed through: World Register of Marine Species at: https://www.marinespecies.org/aphia.php?p=taxdetails&id=212516 on 2024-04-20
Date
action
by
2000-08-31 08:09:39Z
created
Vermaercke, Sigrid
The webpage text is licensed under a Creative Commons Attribution 4.0 License
original description
Monniot, F.; Monniot, C. (1997). Ascidians Collected in Tanzania. <em>Journal of East African Natural History.</em> 86(1), 1-35., available online at https://doi.org/10.2982/0012-8317(1997)86[1:acit]2.0.co;2
page(s): 6, figs. 3D, 5; pl. 1B [details] Available for editors [request]
additional source van der Land, J. (ed). (2008). UNESCO-IOC Register of Marine Organisms (URMO). , available online at http://www.marinespecies.org/urmo/ [details]
page(s): 6, figs. 3D, 5; pl. 1B [details] Available for editors
[request] additional source van der Land, J. (ed). (2008). UNESCO-IOC Register of Marine Organisms (URMO). , available online at http://www.marinespecies.org/urmo/ [details]
Present Present in aphia/obis/gbif/idigbio Inaccurate Introduced: alien Containing type locality
Holotype MNHN A2 DIC.C 396, geounit Menai Strait and Conwy Bay [details]
Unknown type MNHN A2 DIC.C 397, geounit Djibouti [details]
Unknown type MNHN A2 DIC.C 398, geounit Djibouti [details]
Unknown type MNHN A2 DIC.C 399, geounit Djibouti [details]
Unknown type MNHN A2 DIC.C 400, geounit Djibouti [details]
Unknown type MNHN A2 DIC.C 401, geounit Djibouti [details]
From editor or global species database
Description The red, orange, or rusty colonies form tough crusts on different kinds of substrates such as sea grass blades, shells, or corals (pl. 1B). The common cloacal apertures appear as darker spots at the top of small swellings. The colony is of slight thickness, no more than 2 mm deep. The density of spicules makes the colony brittle. Pigments are limited to the colony surface. The common cloacal cavity is quite thin, restricted to the thoracic layer, making it difficult to delaminate the colony's upper surface. The zooids themselves have no special characteristics. The oral siphon is short with six triangular lobes (fig. 5A). The cloacal opening is not wide and no languet arises from its margin. There are six to eight branchial stigmata in a row. The vertically elongated lateral thoracic organs protrude from the rim of the cloacal aperture beside the third row of stigmata (fig. 5A). The retractor muscle is linked to the oesophageal peduncle (fig. 5A); its free length does not exceed the length of the thorax. The abdomen is folded on itself (fig. 5B, C). The gut loop bends at the level of the poststomach and rectum. The testis vesicle lies on the gut loop, covered by four to five turns of the sperm duct (fig. 5C). In colonies containing an ovary and larvae, the testis has disappeared (fig. 5B). Numerous larvae are incubated in the basal layer of the colonies. The larval trunks measure 330 um to 350 um long. The ocellus, otolith, and three rows of stigmata are developed. There are two adhesive papillae, and on each side sometimes five but more often seven pairs of elongated ampullae of unequal length (fig. 5D, E). The larvae are not gemmiparous. The spicules (fig. 3D) are stellate, the largest about 50 um across. The size of the spicules is, on an average, smaller in Tanzania than in Djibouti. The rays are very regularly placed on pentagonal bases. Their tips are either sharp or neatly truncated.[details]
Genetic nomenclature abbreviation Didico [details]
Remark This species has the same colour as Didemnum yolky Monniot & Monnoit 1997, described from Bahrain and also present in Tanzania and Mozambique, but the surface of this new species is smooth. The species' zooids larvae, and spicules also are different. D. dicolla has a larva very similar to that of D.pitipiri Monniot & Monniot 1987 from Polynesia, but the zooids and spicules are different. [details]
Type locality Stations: Tanzania, south of Zanzibar, Menai Bay, 6°24.48'S-039°24.64'E 1.5 m on sea grass bed (CRRF coll.)
Type: MNHN A2 Did C 396. Djibouti, Mescha Island, 0 to 20 m (Monniot coll.) MNHN A2 Did C 397-401 (Monniot & Monniot, 1997). [details]
