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12 results for “Asteriidae”
Figure 1. a, b in A new fissiparous micro-asteriid from southern Australia (Echinodermata: Asteroidea: Asteriidae)
Figure 1. a, b. Allostichaster palmula Benavides-Serrato and O'Loughlin sp. nov. (NMV F113585, holotype): a, abactinal view showing blunt arms, post-fissiparous form, paddle-like inferomarginal spines; b, actinal view showing evidence of 6 arms (2 large, 2 small, 2 detached not shown). c, d. Allostichaster polyplax (Müller and Troschel) (F73988): c, abactinal view of regenerating arm showing clavate marginal spines; d, actinal view showing post-fissiparity form and typical 8 arms. e, f. Allostichaster palmula (NMV F113566, paratype): e abactinal view showing post-fissiparous form, carinal series, papular spaces, and paddle-like inferomarginal spines; f, actinal view showing 3 normal blunt arms and 2 detached not present.
Figure 2. a in A new fissiparous micro-asteriid from southern Australia (Echinodermata: Asteroidea: Asteriidae)
Figure 2. a. Allostichaster palmula sp. nov. (NMV F113585): abactinal view showing 2 typical inferomarginal spines (centre) with distinct stem, broad flat blade with vertical and radiating ribs, and coarsely serrate distal edge. b. Allostichaster polyplax (F73988): abactinal view showing clavate inferomarginal spines. c. Allostichaster palmula (NMV F113566): abactinal view of disc showing distally widened, coarsely spinous, spinelets, and small crossed pedicellaria (top). d. Allostichaster polyplax (F73988): abactinal view of proximal arm showing finely spinous globose and subcolumnar spinelets, and small crossed pedicellaria (top). e. Allostichaster palmula (NMV F113566): abactinal view of arm showing carinal series, papular spaces, and typical paddle-shaped inferomarginal spines (top). f. diagram showing typical skeletal plates of an arm of Allostichaster palmula: a, adambulacral; i, inferomarginal; s, superomarginal; p, papular space (shaded); c, carinal (proximal ray at top).
Figure 4 in A new fissiparous micro-asteriid from southern Australia (Echinodermata: Asteroidea: Asteriidae)
Figure 4.Livespecimenof Allostichaster palmula sp. nov. from 10–12 m at Popes Eye in Port Phillip Bay (NMV F132700; R = 1.2 mm; 5 equal rays at this smallest size; photo by Trevor McMurrich).
FIGURE 13 in A new sea star of the genus Leptasterias (Asteroidea: Asteriidae) from the Aleutian Islands
FIGURE 13. Map of Aleutian Islands, showing known geographic distributions of Leptasterias tatei sp. nov. (●) and Leptasterias stolacantha Fisher, 1930 (▲).
FIGURES 7–10 in A new sea star of the genus Leptasterias (Asteroidea: Asteriidae) from the Aleutian Islands
FIGURES 7–10. Leptasterias tatei sp. nov., Holotype, 2011-158.001.Fig. 7, cleaned adambulacral region (actinal [AC] & adambulacral [AD] spines), Bar = 3.0 mm. Fig. 8, uncleaned adambulacral region, showing wreaths of straight & crossed pedicellariae. Fig. 9, Live, in situ Adak Island, Thumb Bay, 13 m (leg. R.N. Clark, 20 July, 2011), Bar = 8.0 cm. Fig. 10, Paratype, 2011-159.001. Oral side, Bar = 4 cm.
FIGURES 1–6 in A new sea star of the genus Leptasterias (Asteroidea: Asteriidae) from the Aleutian Islands
FIGURES 1–6. Leptasterias tatei sp. nov., Holotype, 2011-158.001. Fig. 1, whole animal, aboral, Bar = 3.0 cm. Fig. 2, aboral surface, Bar = 3.0 mm. Fig. 3, aboral spines & pedicellariae, Bar = 1.0 mm. Fig. 4, aboral surface cleaned of tissue, showing carinal [C] and dorsolateral [DL] ossicles & spines, Bar = 3.0 mm. Fig. 5, aboral spine with pedicellariae, Bar = 1.0 mm. Fig. 6, marginal area of ray, cleaned of tissue, showing arrangement of ossicles (superomarginal [SM], inferomarginal [IM], actinal [AC], and adambulacral [AD]), Bar = 3.0 mm.
FIGURE 5 in A new genus and species of Goniasteridae, Peedeeaster sandersoni, and the first occurrence of Sclerasterias (Asteriidae) from the Cretaceous Peedee Formation of North Carolina
FIGURE 5. Comparison of Peedeeaster sandersoni n. gen., n. sp. with enlarged pre-terminal superomarginals in fossil taxa. A. USNM PAL 618275 abactinal. Scale Bar=5.0 mm. B. Closeup showing enlarged superomarginal plates. Scale Bar=3.0 mm. C. USNM PAL 772335, Metopaster parkinsoni, abactinal. Scale Bar=3.0 mm. D. same. armtip. Scale Bar=3.0 mm.
FIGURE 4 in A new genus and species of Goniasteridae, Peedeeaster sandersoni, and the first occurrence of Sclerasterias (Asteriidae) from the Cretaceous Peedee Formation of North Carolina
FIGURE 4. Comparison of Peedeeaster sandersoni n. gen., n. sp. with enlarged pre-terminal superomarginals in living taxa. A. Abactinal, USNM PAL 618276. Scale Bar=10.0 mm. B. Closeup of enlarged pre-terminal superomarginals. Scale Bar=5.0 mm. C. Plinthaster lenaigae Mah 2018, Holotype IE-2013-7003. Scale Bar=5.0 mm. D. Armtip showing enlarged preterminal superomarginal plates. Scale bar=5.0 mm. E. Sphaeriodiscus mirabilis A.M. Clark 1976, USNM 1116242, Abactinal surface. Scale Bar=5.0 mm. F. Closeup of pre-terminal superomarginal plates. Scale Bar=5.0 mm.
FIGURE 1 in A new genus and species of Goniasteridae, Peedeeaster sandersoni, and the first occurrence of Sclerasterias (Asteriidae) from the Cretaceous Peedee Formation of North Carolina
FIGURE 1. Sclerasterias sp. USNM PAL 618279. Fossil material figured unless otherwise noted. A. Armtip fragment showing transverse ribs and carinal series. Scale bar=2.0 mm. B. Sclerasterias contorta, USNM E12922 Armtip. Abactinal view showing transverse ribs along carinal series. Scale bar=1.0 mm. C. Abactinal view of arm fragment showing carinal and transverse ribs. D. Sclerasterias contorta USNM E12922 Abactinal view of arm fragment showing carinal and transverse ribs. E. Sclerasterias contorta USNM E34058 showing superomarginal and inferomarginal plates. F. Superomarginal, inferomarginal and adambulacral plates. Abbreviations: Ad= Adambulacral plate, CAR=Carinal plate, CAR-SP=Carinal spine, Pap=papular space, Trv=Transverse rib, SM=Superomarginal plate. IM sp.=Inferomarginal spine, SM sp.=Superomarginal spine.
FIGURE 3. Peedeeaster sandersoni n. gen, n in A new genus and species of Goniasteridae, Peedeeaster sandersoni, and the first occurrence of Sclerasterias (Asteriidae) from the Cretaceous Peedee Formation of North Carolina
FIGURE 3. Peedeeaster sandersoni n. gen, n. sp. A. USNM PAL 618274 holotype. Abactinal surface. Scale Bar=5.0 mm. B. Closeup abactinal surface, pre-terminal superomarginal plates. Scale Bar=2.5 mm. C. Columnar-hourglass abactinal plates from USNM 618274. Top-side view (right) scale=1.0 mm and USNM 618275 side view, abactinal, top side (left) scale=0.5 mm. D. Superomarginal plates from interradius showing granular cover. Scale= 2.5 mm. E. Lateral view, inferomarginal plates. Scale Bar=3.0 mm. F. Furrow spines, actinal details. Scale Bar=5.0 mm. G. USNM PAL 618275, paratype. Closeup of actinal surface showing adambulacral plates and other details. Scale Bar=2.0 mm. H. Actual surface. Scale Bar= 3.0 mm.
FIGURE 2 in A new genus and species of Goniasteridae, Peedeeaster sandersoni, and the first occurrence of Sclerasterias (Asteriidae) from the Cretaceous Peedee Formation of North Carolina
FIGURE 2. Sclerasterias sp. USNM PAL 618279. Fossil material figured unless otherwise noted. Scale bar=2.0 mm. A. Superomarginal and inferomarginal spines, adambulacral plates. B. Sclerasterias contorta, USNM E 34058 showing tube foot groove, ambulacral plates,, adambulacral plates, inferomarginals and superomarginals. C. Actinal view showing adambulacral plates, inferomarginal spines and adjacent plates. D. Cross section showing ambulacrals, marginals and adambulacrals. Arrow pointing to the right in the lower right corner indicating abactinal direction. Abbreviations: Admb= Adambulacral plates, Ad sp=Adambulacral spines, Fur=furrow spine, IM plate=Inferomarginal plate, IM sp=Inferomarginal spine, TF groove=tube foot groove, Trv=Transverse rib.
Figure 3 in A new fissiparous micro-asteriid from southern Australia (Echinodermata: Asteroidea: Asteriidae)
Figure 3. Asteriid species of the rocky shallows of the coast of Victoria. a, b. Coscinasterias muricata Verrill (NMV F73314): a, abactinal view showing unequal arm lengths (fissiparous when juvenile), alternating spiniferous and non-spiniferous small carinal plates, and digitiform thin marginal spines; b, actinal view showing 10 arms (2 very small regenerating) of a typically 11 arm species. c, d. Uniophora granifera (Lamarck) (NMV F113567): c, abactinal view showing typical 5 equal rays, globose abactinal spinelets, and globose marginal spines; d, actinal view showing globose spines with distinct stem. e, f. Smilasterias multipara O'Loughlin and O'Hara (NMV F121895): e, abactinal view showing typical 5 equal rays, digitiform thin marginal spines; f, actinal view.
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International Brain Laboratory public data
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OpenNeuro
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