the primitive streak is seen on
top of the shield, and this appears
smaller in guppies relative to Gambusia
(drawing at the left). At the optic
cup stage (stage 6; Fig. 1E), the eyes
remain unpigmented, blood vessels of
the portal system are visible in the
lower part of the yolk sac, and the
heart becomes perceptible as a pulsating
tube. The early-eyed embryo
(stage 7; Fig. 1F) is pigmented light
brown, first at the dorsoanterior margin
and subsequently throughout the
retina. Melanophores are undetectable
on the head or trunk at this
stage. During the early-eyed period,
pigmentation of the eye, including the
choroid, gradually increases, the pectoral
fin buds emerge, and somitic as
well as nonsomitic muscles differentiate.
the primitive streak is seen on
top of the shield, and this appears
smaller in guppies relative to Gambusia
(drawing at the left). At the optic
cup stage (stage 6; Fig. 1E), the eyes
remain unpigmented, blood vessels of
the portal system are visible in the
lower part of the yolk sac, and the
heart becomes perceptible as a pulsating
tube. The early-eyed embryo
(stage 7; Fig. 1F) is pigmented light
brown, first at the dorsoanterior margin
and subsequently throughout the
retina. Melanophores are undetectable
on the head or trunk at this
stage. During the early-eyed period,
pigmentation of the eye, including the
choroid, gradually increases, the pectoral
fin buds emerge, and somitic as
well as nonsomitic muscles differentiate.
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