R. Kado et Mh. Kim, LARVAL DEVELOPMENT OF OCTOMERIS-SULCATA NILSSON-CANTELL (CIRRIPEDIA, THORACICA, CHTHAMALIDAE) FROM JAPAN AND KOREA, Hydrobiologia, 325(1), 1996, pp. 65-76
Embryos obtained from gravid adults of the chthamalid barnacle Octomer
is sulcata Nilsson-Cantell from Japan and Korea were cultured through
six naupliar stages to the cyprid and juvenile barnacle stage in labor
atory conditions, fed either the diatom Skeletonema costatum (Grev.) C
leve or the dinoflagellate Prorocentrum minimum (Pavillard) Schiller.
The nauplii were planktotrophic and, depending on diet, reached the cy
prid stage 9 or 17 days after hatching in individual cultures at 22 de
grees C with 24 h illumination. The survival rate was higher and the d
uration of the naupliar stages was shorter when fed P. minimum rather
than S. costatum. This is probably due to the presence of feathered se
tae on the antennae. Feathered or plumose setae in nauplii of differen
t cirripede taxa are apparently linked to the type of phytoplankton in
the seas when these taxa first evolved. The larval stages of O. sulca
ta are described, and morphological differences between larvae reared
from Japanese and Korean adults are compared. The polygonal cephalic s
hield and unilobed labrum, a pair of posterior shield spines after nau
pliar stage IV, feathered setae and a hispid seta on the coxa of the a
ntenna, a cuspidate seta on the mandible, and the gnathobase of the an
tenna are important in distinguishing the nauplii of this species from
other species, including Chthamalidae.