Table 2 Muscle systems in larvae of 9 bivalve species
From: Developmental dynamics of myogenesis in the shipworm Lyrodus pedicellatus (Mollusca: Bivalvia)
Speciesfamily | Foot musculature: no. of pairs, except protractor (unpaired) | Mantle musculature: no. of pairs | Adductor unpaired | Velum retractor no. of pairs, except accessory retractor (unpaired) | Oral velum musculature unpaired | Velum ring musculature | Ventral larval retractor no. of pairs | ||||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
Foot retractor | Access. foot retractor | Protractor | U-shaped | Finger-shaped | Lateral | Dorsal | Anterior | Posterior | Other | Dorsal | Ventral | Accessory | Total number described | ||||
Ostrea edulis Ostreidae | 1 | 1 | ? | ? | ? | ? | ? | 1 | 1 | ? | 1 | 1 | ? | 3 | ? | ? | ? |
Pecten maximus Pectinidae | ? | 1 | ? | ? | ? | ? | ? | 1 | 1 | ? | ? | ? | ? | 4 | ? | - | 3 |
Mytilus trossulus Mytilidae | ? | ? | ? | 1 | ? | ? | ? | 1 | 1 | ? | ? | ? | ? | 3 | ? | 1 | 3 |
Anodonta cellensis Unionidae | 1 | 1 | ? | ? | ? | ? | ? | 1 | 1 | 1 (larval) | - | - | - | - | ? | - | - |
Lasaea adansonii Galeommatidae | 1 | 1 | 1 | 1 | ? | ? | ? | 1 | 1 | ? | ? | ? | ? | 3 | ? | ? | ? |
Pandora inaequivalvis Pandoridae | 1 | 1 | ? | ? | ? | ? | ? | 1 | 1 | ? | 1 | 1 | ? | 3 | ? | ? | ? |
Dreissena polymorpha Dreissenidae | 1 | ? | ? | ? | ? | ? | ? | 1 | 1 | ? | 1 | 1 | - | 2 | ? | ? | 1 |
Teredo sp. Teredinidae | ? | 1 | ? | ? | ? | ? | ? | ? | ? | ? | 1 | 1 | - | 2 | ? | ? | - |
Lyrodus pedicellatus Teredinidae | 1 | 1 | - | 1 | 1 | 1 | 1 | 1 | 1 | 1 (accessory) | 1 | 1 | 1 | 3 | + | + | 1 |