Stichasteridae (Mah & Foltz, 2011)

Figure 9. Wall skeleton arrangement along the arms of forcipulatids. A, Pycnopodia helianthoides (modified from: Fisher, 1928: pl. 79); B, Coronaster pauciporis (MNHN-IE-2014–80); C, Urasterias linckii (YPM No 87685); D, Brisingaster robillardi (MNHN-IE-2009–7198) E, Asterias forbesi (UniFR-PL-2019-002); F, Stichaster striatus (MNHN-IE-2013–12864). Proximal direction to the right, actinal to the bottom. Coloured areas indicate ossicle homology. In green: carinals; in pink: primary abactinals; in light pink: secondary abactinals; in blue: superomarginals; in orange: intermarginals; in yellow: inferomarginals; in brown: actinals. In lighter colour (green, blue and yellow) are differentiated plates of the carinals, superomarginals and inferomarginals. They are morphologically differentiated and generally do not bear spines. Note that no carinal series can be recognized in Brisingaster robillardi, and the light green plates represent the plate that are on top of the arm in the expected position for carinals. Actinal to the bottom. See Table 2 for abbreviations. Scale bars: 5 mm.

Figure 9. Wall skeleton arrangement along the arms of forcipulatids. A, Pycnopodia helianthoides (modified from: Fisher, 1928: pl. 79); B, Coronaster pauciporis (MNHN-IE-2014–80); C, Urasterias linckii (YPM No 87685); D, Brisingaster robillardi (MNHN-IE-2009–7198) E, Asterias forbesi (UniFR-PL-2019-002); F, Stichaster striatus (MNHN-IE-2013–12864). Proximal direction to the right, actinal to the bottom. Coloured areas indicate ossicle homology. In green: carinals; in pink: primary abactinals; in light pink: secondary abactinals; in blue: superomarginals; in orange: intermarginals; in yellow: inferomarginals; in brown: actinals. In lighter colour (green, blue and yellow) are differentiated plates of the carinals, superomarginals and inferomarginals. They are morphologically differentiated and generally do not bear spines. Note that no carinal series can be recognized in Brisingaster robillardi, and the light green plates represent the plate that are on top of the arm in the expected position for carinals. Actinal to the bottom. See Table 2 for abbreviations. Scale bars: 5 mm.