Following previous descriptions and knowing that echinoids
(sea urchins) are gonochoric, we argue that existence of ovotestis in Loxechinus albus corresponds to an isolated phenomenon that perhaps depicts a sequential hermaphroditism detected on this occasion first as male, then female.
Parallel evolution of nonfeeding larvae in echinoids
The mean of gonads weight of 9.9 g (SD = 6.8 g), totaling 500 g for 50 echinoids
Reproductive periodicity of the echinoids
Diadema and Echinometra on the two coasts of Panama.
Local or random movement has been observed in previous movement studies of echinoids
(Dumont et al.
Diademasetosum (Leske, 1778) (Echinometra: Echinoidea: Diadematidae) also known as long-spined black sea urchin, is one of the most common echinoids
that widely distributed in the Indo-West Pacific Ocean especially in coral ecosystems,and have profound biological, ecological and aquacultural significance (Lessios et al., 2001; Rahman et al., 2012a).
Sample analysis: Carbon and nitrogen were measured from the muscle of the Aristotle's lantern (echinoids
), and from bulk tissues (algae).
Kanazawa, "Adaptation of test shape for burrowing and locomotion in spatangoid echinoids
," Palaeontology, vol.
Seshadri, "Porous gold structures through templating by echinoid
skeletal plates," Chemical Communications, no.
The differential effects of seasonal stress and predation on the stability of reef-flat echinoid
(2) Department of Geology, University of lbadan, lbadan E-mail: email@example.com Table 1: Summary table of components of ibese limestone Plate Depth Fossil Intraclast Ooid (M) 1 23.0 Sponge Spicules v X 2 24.5 Sponge Spicules v v 3 34.0 Echinoid
X X Sponge Spicules Bivalves 4 37.5 Pelecypod X X 5 38.5 Pelecypod v v 6 40.0 Sponge Spicules X X 7 47.5 v X 8 48.5 Globorotalia v X Cerroazulensis Plate Depth Pellet Support Sparry (M) Calcite 1 23.0 v MUD/GRAIN v 2 24.5 v MUD v 3 34.0 X MUD X 4 37.5 X GRAIN v 5 38.5 v MUD/GRAIN v 6 40.0 v MUD X 7 47.5 v GRAIN v 8 48.5 v MUD v
The sand dollar echinoid
Periarchus lyelli (Conrad) is a distinctive and well-known element of the fauna of Upper Eocene (Jackson) marls and limestones across the eastern Gulf of Mexico and lower Atlantic coastal plain.