Ultrastructural survey of tunic morphogenesis in the larval and young adult ascidian Ascidiella aspersa (Tunicata, Ascidiacea)
Lübbering, B.; Goffinet, G. (1991). Ultrastructural survey of tunic morphogenesis in the larval and young adult ascidian Ascidiella aspersa (Tunicata, Ascidiacea). Belg. J. Zool. 121(1): 39-53
In: Belgian Journal of Zoology. Koninklijke Belgische Vereniging voor Dierkunde = Société royale zoologique de Belgique: Gent. ISSN 0777-6276; e-ISSN 2295-0451, more
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| Keywords |
Ascidiacea [WoRMS]; Ascidiella Roule, 1884 [WoRMS]
Marine/Coastal |
| Author keywords |
ASCIDIAN; ASCIDIELLA; TUNIC |
| Authors | | Top |
- Lübbering, B.
- Goffinet, G., more
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| Abstract |
In Ascidiella aspersa, tunic development begins during the tail-bud stage. In the trunk, the larval cuticle and three tunic layers arise consecutively. In the tail, just the larval cuticle and one tunic layer are formed. Shortly before metamorphosis, a new very thin layer arises limiting the tail tunic interiorly. The tunic is composed of granular and fibrillar material embedded in an electron-transparent ground substance. In the course of metamorphosis, the tail is retracted. The larval cuticle and the first tunic layer are discharged. The young ascidian is just surrounded by a cuticle and one tunic layer. |
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