The Scolicia burrows are interpreted as being inhabited by spatangoid
echinoids (Scolicia; Fig.
Like most spatangoid
urchins, adaptations that allow Brisaster fragilis to move unidirectionally within the sediments include test shape (i.e., bilateral body plan, low test profile) and the morphology and distribution of their spines (e.g., division of labour with functionally and structurally distinct areas of spines and tubercles ).
Larval growth and perimetamorphosis in the echinoid Echinocardiwv cordalum (Echinoder-mata): the spatangoid
way to become a sea urchin.
latifrons was similar to descriptions by MacBride (1914), Fenaux (1961, 1969, 1972), and Rees (1953) for other, obligate-feeding spatangoid
larvae, and by Runnstrom (1929) for larvae of B.
To do this, we will reconstruct the phylogenetic pattern of relationships for the spatangoid
sea urchin Echinocardium, and explore, through shape analysis, the evolutionary processes involved in the differentiation of the species within the genus.
Numerous gregarines indeed parasitize holothuroids and spatangoid
echinoids, with 22 known species, including D.
sp., a sexually dimorphic amphiurid brittle star (Echinodermata: Ophiuroidea), epizoic on a spatangoid
Thus, glycine-rich repeat structure remains a common trait of the bindin of the Echinoida, although, as the data from the spatangoid
Moira indicate, it is not a characteristic limited to this order or even to a closely aligned clade.
jacobyi lowers the center of mass, presumably facilitating upright orientation (Pennington and Strathmann, 1990; Young, 1995), but this is a feature also found in shallow-water spatangoid
larvae (Mortensen, 1921).
The aims of the article are to give (1) an overview of the true direct development of this brood-protecting spatangoid
that is endemic to the Kerguelen Islands (South Indian Ocean, 70 [degrees] 12 [minutes] E, 49 [degrees] 21 [minutes] S) and (2) preliminary evidence for a new mode of gastrulation.
Ultrastructure of the penicillate podia of the spatangoid
echinoid Echinocardium cordatum (Echinodermata) with special emphasis on the epidermal sensory-secretory complexes.
, feeding larvae possess an unpaired posterior process that resembles an arm (see, e.g., Emlet et al., 2002).