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@aqmhd2026.bsky.socialOct 9, 2026, 9:38 PM

#Zebrafish #Gar #Killifish #Medaka #Stickleback #Xiphophorus #Lamprey #Xenopus #Cephalopod #Squid #Hydra #Aplysia #Nematostella #Tunicate #SeaUrchin #Planarian #Ctenophore #Ciona #Echinoderm #Aiptasia #Coral #ComparativeBiology

@sicbjournals.bsky.socialOct 9, 2026, 12:25 PM

Meet IOB author R.L. Turner

Of his 66 publications, 50 appear in refereed journals and books, and he is coauthor of the textbook Introduction to Marine #Biology, now in its fourth edition. 

www.fit.edu/faculty-prof... nbsp; nbsp;

& read
The Tagmatized #Echinoderm
doi.org/10.1093/iob/...

Fig. 7 Specialized tagmata in euryalid ophiuroids. (A) The basketstar Gorgonocephalus eucnemis, with basal arm branches strengthening the disc. Asterisks (*) show approximate locations of the axillary ossicles (branch point as in crinoids); dashed lines indicate the junctions between the fixed-arm tagma and free-arm tagma. Scale bar 1 cm. (B) Asteroporpa annulata, strongly curled arm tip with hooked arm spines (sp), which differ from pedicellarial valves (pv) and fully grown arm spines (inset). Scale bars 100 µm. (C) Asteroschema tenue, a snakestar with gonads that extend into the coelom of basal arm segments. Scale bar 5 mm. https://www.fit.edu/faculty-profiles/emeritus/turner-richard/
@sicbjournals.bsky.socialOct 8, 2026, 11:23 AM

IOB
"The argument is advanced here that examples of #tagmosis are not hard to find among echinoderms, a fourth major group of metameric animals; but the degree of tagmosis is weak in most cases. "
The Tagmatized #Echinoderm
R L Turner
doi.org/10.1093/iob/...

#science #biology

Fig. 3 Comactinia meridionalis and pinnules. (A) Whole preserved specimen with most of its 10 arms visible and with examples of oral (orp), genital (gep), and distal pinnules (dip) indicated by pointers. Scale bar 5 mm. (B) An oral pinnule in foreground, with others in background. Scale bar 2 mm. (C) Five genital pinnules of a non-gravid specimen. Scale bar 2 mm. (D) A distal section of arm with numerous distal (feeding) pinnules. Scale bar 2 mm.
@sicbjournals.bsky.socialOct 7, 2026, 11:44 AM

IOB

Fig. 2 Comactinia meridionalis tagmata. (see image description)

The Tagmatized #Echinoderm

R L Turner

doi.org/10.1093/iob/...
#science #biology

IOB Fig. 2 Comactinia meridionalis tagmata. The dorsal-most part of the body of this 10-armed featherstar consists of a tight cluster of ossicles: a #centrodorsal (cd, mostly hidden by cirri), to which are attached a circlet of cirri (ci) and a ring of five basals (hidden). Five arm bases arise from a second ring of five radials, one partly showing between the asterisks (*). Radials give rise to the first tagma of the axial skeleton: one brachial (br) and an axillary (ax). Two branches, free arms, arise from the axillary, each branch a long series of brachials that form a second (distal) tagma. Scale bar 2 mm. from The Tagmatized #Echinoderm R L Turner https://doi.org/10.1093/iob/obag040 #science #biology
@sicbjournals.bsky.socialOct 5, 2026, 11:25 AM

IOB

The Tagmatized #Echinoderm

R L Turner

doi.org/10.1093/iob/...

Tagmosis is a derived condition of metamerism in annelids, #arthropods, and chordates in which groups of adjacent segments are modified to perform specific functions.

#science #biology

Examples are the clitellum of #earthworms, the carapace of #lobsters, and the sacrum of #tetrapods, to mention a few. The argument is advanced here that examples of tagmosis are not hard to find among echinoderms, a fourth major group of metameric animals; but the degree of tagmosis is weak in most cases. The first few segments of the axial skeleton are often conjoined as a perioral tagma (e.g., the jaws and other parts of the oral frame of asteroids and ophiuroids and the lantern supports of echinoids). Several segments beyond the oral frame unite the disc with the base of the arm in #ophiuroids. Crinoid pinnules occur in groups along the arms as oral, genital, and feeding pinnules. Porcellanasterid seastars have cribriform organs along the marginal ossicles on the base of the arm for generation of respiratory currents. Well-developed podial pores and podia are restricted to basal segments of the ophiuroid genus #Ophiomusium. Ambulacral plates of most post-Paleozoic #echinoids occur in clusters that result in arcs of variable numbers of pore pairs and spine tubercles, giving rise to several non-cidaroid tagmatized patterns. The strongest degree of tagmosis occurs in the bilaterally symmetrical echinoids, with petals, phyllodes, plastrons, and frontal ambulacra; and tagmosis differs among the axes. Tagmosis is absent in extant holothuroids, bodies of which are almost entirely composed of extra-axial elements. Tagmosis occurs in the oral regions of many extinct echinoderm classes, and the ambulacra are tagmatized in some, particularly in blastozoan classes and those with branched ambulacra.
@zeesm.bsky.socialSep 27, 2026, 4:36 AM

A few feather stars, aka crinoids. The name crinoid is derived from Greek roots meaning "lily-like", which, um, sure...🦑 #oceanlife #echinoderm #scuba #diving #fiji

A gold and black feather star with its numerous arms curled into a loose ball on coral.a black feather star sitting in the middle of a patch of pale coral.A white and a black feather star sitting side by side on a coral mount.
@lincoln-shoemaker.bsky.socialSep 25, 2026, 7:13 PM

Always a pain to prepare, but somewhat showy - Zeacrinites from the Bangor Formation of Alabama.

#crinoid #echinoderm #fossil #carboniferous

@aqmhd2026.bsky.socialSep 25, 2026, 2:15 PM

Last day to register!!!
#Zebrafish #Gar #Killifish #Medaka #Stickleback #Xiphophorus #Lamprey #Xenopus #Cephalopod #Squid #Hydra #Aplysia #Nematostella #Tunicate #SeaUrchin #Planarian #Ctenophore #Ciona #Echinoderm #Aiptasia #Coral #ComparativeBiology

@xtremo-devo-lab.bsky.socialSep 23, 2026, 2:15 PM

Only 2 days left to join us in MBL!
#Zebrafish #Gar #Killifish #Medaka #Stickleback #Xiphophorus #Lamprey #Xenopus #Cephalopod #Squid #Hydra #Aplysia #Nematostella #Tunicate #SeaUrchin #Planarian #Ctenophore #Ciona #Echinoderm #Aiptasia #Coral #ComparativeBiology