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Table 1 The presence of muscles in larvae of two phoronid species and the fate of these muscles during metamorphosis

From: Development, organization, and remodeling of phoronid muscles from embryo to metamorphosis (Lophotrochozoa: Phoronida)

Muscle Found in larva / Fate in metamorphosis
Phoronopsis harmeri(this paper) Phoronis pallida[[10, 11]]
1. Annular muscle of the hood + but lost in the first minutes + and then lost
2. Radial and circular muscles of the hood + but lost in the first minutes + and then lost
3. Hood depressors +, retained for 15 minutes, and then lost + (referred to as “hood elevators”) and then lost
4. Hood elevators + and then lost + (are not shown) and then lost
5. Esophageal musculature + and then incorporated in the juvenile body + / ?
6. Transverse muscles of collar + and then lost + and then lost
7. Collar ring muscle + but lost in 10 minutes + and then lost
8. Tentacle elevators + and then incorporated in the juvenile body + and then lost
9. Tentacle depressors + and then lost + and then lost
10. Trunk body musculature including muscles of the blood vessels + and then incorporated in the juvenile body + (dorsal blood vessel of larva referred to as “dorsal retractor”) and then lost
11. Trunk retractors + , retained for 15 minutes, and then lost ___
12. Telotroch flexors + and then lost + and then lost
13. Telotroch constrictor +, retained for 9 days, and then lost ___
14. Metasomal sack musculature + and then gives rise to the musculature of the juvenile trunk body wall ? / ?
  1. "+" stands for presence of muscles in larva;
  2. "-" stands for absence of muscles in larva;
  3. "?" is used if information absence.