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Figure 6 | Frontiers in Zoology

Figure 6

From: Myogenesis of Malacostraca – the “egg-nauplius” concept revisited

Figure 6

Muscle ontogeny in the caudal papilla, posterior pleon- and telson anlage of all four species. a-f extended optical sections, g-q maximum intensity projections. a-h, n-q dorsal view, i ventral view, j-l lateral view, m dorsolateral view. Anterior is oriented to the top in all images, a-c, e-g, n and o show only the right body half. a Gf II . lmp-post, mesoteloblast rMT2 and reconstructed mesodermal cells are shown. b Gf III . lmp-post is enlarged, mesoteloblasts and mesodermal cells are visible. c Gf IV . Broad shape of lmp-post. Mesoteloblasts and mesodermal cells are no longer visible. d Gf V . Telson is delineated (bracket). tf inserts in the anterior dorsal region of telson. e Nh II . lmp-post, mesoteloblasts and mesodermal cells are visible. Telson is delineated. f Nh II slightly later in development (specimen not shown in Figure 3). lmp-post, has enlarged, only one mesodermal cell row can be identified. Telson is delineated. g Nh III . Broad shape of lmp-post, striation is visible. Mesoteloblasts and mesodermal cells are no longer visible. lmp-d is visible in P4. Telson is delineated. h Nh IV . tf show the adult tripartite pattern and insert anterodorsally in the telson. i Ni II . Telson and uropods are delineated. Mesoteloblasts and mesodermal cells are no longer visible. lmp shows a-p gradient of differentiation and reaches P6. j Ni III Posterior part of lmp (tf) extends into telson. k Ni IV . tf is enlarged and separated from lmp. k Ni IV. Slightly later in development (specimen not shown in Figure 4). l Ni IV. Yet later in development: tf show tripartite structure. m Ni V. tf show adult morphology and insert anterodorsally in the Telson. n Ph III . Telson and uropods are delineated. Mesoteloblasts and mesodermal cells are no longer visible. lmp shows a-p gradient of differentiation and reaches P1. lmp-d reaches P3. o Ph IV . lmp and lmp-d are enlarged and show metameric subdivision. Both reach P6. p Ph IV. Slightly later in development (specimen not shown in Figure 5). Individual segmental muscle units are enlarged and gut muscle becomes apparent. q Ph V. lmp and lmp-d are differentiated in P6, but telson remains free of musculature. The muscle precursors marked upm lie within the uropods, ventrally of the telson. Abbreviations: P proctodeum, rMT2 second mesoteloblast cell of left body half, tf telson flexor muscles, T telson anlage, UP uropod anlagen, upm uropod muscle precursors, P1-P6 pleon segments 1–6, gm gut muscle primordia. Scalebars are 50 μm in all panels.

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