Fig. 4
From: Also looking like Limulus? – retinula axons and visual neuropils of Amblypygi (whip spiders)
Cobalt fills simultaneously via median and lateral eyes in Amblypygi. Phrynus pseudoparvulus; all eight eyes stained; sagittal sections. a-d, Three consecutive sections of the same specimen; c detail of b. Cobalt visible in (I) the first median eye visual neuropil, (II) the tract between first and second median eye neuropil (arrows), (III) the second median eye visual neuropil, (IV) a thin tract between the second median eye and second lateral eye visual neuropil (arrowheads), (V) the second lateral eye neuropil, (VI) the tract between the first and second median eye neuropil (not shown, but available on morph-d-base) and (VII) the first lateral eye neuropil (not shown, but available on morph-d-base). Note U-turn of a few fibres (arrowheads) from the second median eye neuropil to a thin tract connecting the second median and second lateral eye neuropil. Bars 50 μm. e, f, Different specimens showing details of the connection between the second median and second lateral eye neuropil via a thin tract (arrowhead). Bars 50 μm. M1, first median eye visual neuropil; M2, second median eye visual neuropil; L2, second lateral eye neuropil; arrow, tract connecting M1 and M2; a-c subunits of L2; arrowhead thin tract connecting M2 and L2