Nonetheless, the scenario proposed by Bauer (1986) about the origin of this structure no longer seemed plausible after males with prehensile third pereopods were documented in the gonochoric
species T dobkini and T.
The majority of gonochoric
molluscs with known gender-determining systems, including some bivalves (Allen et al.
irus is a strictly gonochoric
species, like other tellinid clams (Brousseau 1987).
testudinalis is gonochoric
(dioecious), and males and females were sorted on the basis of ventral foot coloration.
One way of classifying the sexual modes of colonial animals (Wasson and Newberry, 1997) is to designate each of the three organizational levels as gonochoric
(G), sequentially hermaphroditic (s), or simultaneously hermaphroditic (H).
ABSTRACT Through histological analyses, this investigation reveals an unusual high incidence of hermaphroditism in Megapitaria squalida, a gonochoric
Pseudoplexaura porosa is a gonochoric
broadcast spawner with a 1:1 sex ratio; it spawns in highly predictable events that occur shortly after sunset after the summer full moons (Lasker et al., 1996; Ross and Lasker, unpubl.
Although most species are gonochoric
, three of the six holothurian orders have hermaphroditic representatives (Smiley et al., 1991).
Microscopic inspection of the histologic sections of all specimens showed the species to be gonochoric
with 85 of the specimens being males and 74 females (Table 1).
kuna is a gonochoric
, broadcast spawner that releases its eggs during 4-6 day spawning events that occur four days after the full moon during the months of June-September or May-August depending on the timing of the full moon (Brazeau and Lasker, 1989).
For example, Placopecten magellanicus is considered to be a gonochoric
species (Parsons et al.
The aim was to establish the timing and duration of the reproductive season, whether the species is gonochoric
(separate sexes) or a simultaneous hermaphrodite, whether it broods its embryos or sheds gametes to the water, what kind of embryos develop in this species, and what type of cells give rise to the gametes.