Fig. 4

Histological sections of Sepiola atlantica. a Cross-section of a hatchling at 24 days age on 10× magnification showing the rest of inner yolk sac; note the lateral lobe (ll) as two round structures embedded in the digestive gland (dg) and the transversal structure lying between them, on top of the ink sac (is), which is the middle part of the anterior lobe (al); b The same section at 60× magnification detailing the lateral lobe embedded admedially in the diverticula of the digestive gland, the middle part of anterior lobe is visible; c Frontal (horizontal) section of a hatchling 3 h old at 4× magnification. The dotted line indicates where the sections showed in figures (a) and (b) were made. Scale bars: 50 μm (a), 100 μm (b), 0.5 mm (c) sg stellate ganglion; fp fin pouch