black smooth brittle star with ridges on disk
black brittle star with granules on disk, prominent arm spines
BIG BLACK BRITTLE STARS! Ophiomaza (feather star associate) and Ophiocoma! Both sizeable animals maybe 2 to 3 inches in diameter! The ridged one from central Pacific tropics, the other from Eastern tropics! #echinoday #ophiuroidea
Une nouvelle #ophiure d'Europe peu connue ramène sa fiche sur les pages DORIS des #Echinodermes : c'est l'ophiure molle !
DUCARME Frédéric, ANDRÉ Frédéric in: #DORIS, 14/07/2025 :
Ophiomyxa pentagona (Lamarck, 1816), doris.ffessm.fr/ref/specie/6...
#biodiversite #Ophiuroidea #Echinodermata #FFESSM
Fig. 1Mature ovaries and spawned eggs. (A) Ovaries in the planktotrophic developer, Ophiocoma scolopendrina, packed with small (100 µm diam.) red eggs (arrows). (B) Dissected gonads from Ophiarthrum elegans showing large (ca. 380 µm diam) green eggs of this lecithotrophic developer. (C, D) Fertilized eggs of Breviturma dentata (C) and Ophiocoma scolopendrina (D) with smooth and ornate fertilization envelopes (arrows), respectively. (E, F) Histology sections of the ovaries of Breviturma dentata (E) and Ophiomastix endeani (F). The magenta stain indicates presence of yolk (see methods), which dominates the eggs of B. dentata. (G, H) Plastic sections of the eggs of these species showing the dominance of yolk granules (Y) in the eggs of B. dentata (G) and lipid droplets (L) in the eggs of O. endeani (H). N, nucleus. Scale bars: A, B = 500 µm, C, D, F = 100 µm, E = 50 µm, G, H = 10 µm.
Invited-Celebrating the legacy of John Pearse
organized by Kit Karen Yu Chan, Maria Byrne, &
James McClintock
including
#Evolution of Maternal Provisioning and Development in the #Ophiuroidea: Egg Size, #Larval Form, and Parental Care
Byrne et al
doi.org/10.1093/icb/...
Pondering representations of #BrittleStars and #StarFish this weekend using some of the #BeadWeaving techniques I’ve learned.
#Ophiuroidea #Asteroidea
#Deuterostomia: #Stachelhäuter ( #Echinodermata), #Schlangensterne ( #Ophiuroidea), #Seeigel ( #Echinoidea), #Manteltiere ( #Tunicata, #Urochordata)
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