Skip to main content
Fig. 1 | Zoological Letters

Fig. 1

From: First description of epimorphic development in Antarctic Pallenopsidae (Arthropoda, Pycnogonida) with insights into the evolution of the four-articled sea spider cheliphore

Fig. 1

Embryonic stages of Pallenopsis villosa. Stereomicroscope images of Sytox-stained embryos. Arrows mark the anterior pole of the germ band. a Late germ disc and early germ band stages. Note the distinctly higher density of nuclei in the most advanced stage in the lower right corner. b Most advanced embryonic stage in the material studied. Ventral view. The primordia of the cheliphore are visible as small protrusions in the anterior half of the germ band. c Higher magnification of the embryo shown in b. Ventro-lateral view. The stippled circle highlights the area of the invaginating stomodeum. The palpal and ovigeral segment anlagen (pa? and ov?, respectively) are likely to be defined at this stage, but distinct limb primordia are still absent. Abbreviations: ch – cheliphore; ov? – ovigeral segment anlage?; pa? – palpal segment anlage?

Back to article page

Zoological Letters

ISSN: 2056-306X

Contact us