Larval development of Chthamalus malayensis (Cirripedia : Thoracica) reared in the laboratory

Larvae of Chthamalus malayensis (Cirripedia: Thoracica) from Hong Kong were cultured in the laboratory. Larval development includes six naupliar stage s and a non-feeding cypris stage. Larvae reached the cypris stage in 20 d a t similar to 21 degreesC. Morphological features including the cephalic shi eld, frontal horns, labrum, abdominal process, antennules, antennae and man dibles in all nauplius and cypris stages were described and illustrated usi ng a combination of light microscopy and scanning electron microscopy. Atte mpts were made to compare morphological differences between the nauplii and cyprid of C. malayensis with those of other Chthamalus species including C . stellatus, C. montagui, C. dentatus, C. fragilis, C. dalli, C. antennatus , C. fissus and C. challengri. The present description of the nauplii of C. malayensis is not in agreement with the previous description of this speci es.