Nunzio Crescenti

Postembryonic Development of Pseudocyclops Umbraticus Giesbrecht, 1893 (copepoda, Calanoida) from Coastal Waters of Sicily

The authors describe the six naupliar and five copepodid stages of Pseudocyclops umbraticus raised in the laboratory. These are the first data on the ontogenetic stages of a species of the genus Pseudocyclops. On the basis of these results and the adult morphology (Giesbrecht, 1893), the authors place P. umbraticus in an intermediate position between the lepidotus-kulai and crassiremismagnus groups of Ohtsuka et al. (1999).

Developmental stages of Antarctomysis ohlinii Hansen, 1908 (Mysidacea) in Terra Nova Bay, Ross Sea, Antarctica

ABSTRACT Detailed descriptions of 2 intramarsupial stages, the juvenile stages, and male and female immature stages are given. Stage II shows an abundant yolk mass, 2 pairs of rudimentary antennae, and poorly developed mandibles. In stage III the yolk is absorbed and all the thoracic and abdominal appendages project freely. The juvenile stage starts when the larva leaves the marsupium. The antennulae, the antennae, and the mandibles assume the typical aspect of those of the adults. A statolith inside the statocyst appears in the endopod of the uropods. A morphological peculiarity of its immature stages (both in males and females) is described and referred to as sexual dimorphism.

MEDITERRANEAN SPECIES OF THE GENUS PONTONIA LATREILLE, 1829. II. DEVELOPMENTAL STAGES OF PONTONIA FLAVOMACULATA HELLER, 1864 (DEC APOD A, NATANTIA, PONTONIINAE) REARED IN THE LABORATORY

The paper describes the main differences between larval and post-larval Pontonia pinnophylax and P. flavomaculata, the type-species and the other Mediterranean member of the genus Pontonia, respectively.

Copepodid Development of Pseudanthessius Gracilis Claus, 1889 (Copepoda, Poecilostomatoida, Pseudanthessiidae), a Copepod Associated With Hydroides Elegans (Haswell, 1883) (Annelida, Polychaeta) of Lake Faro (Messina, Italy) as Obtained in the Laboratory

The five copepodids of Pseudanthessius gracilis, a poecilostomatoid copepod (family Pseudanthessiidae) reared in the laboratory, are described. Sexual dimorphism occurs first in copepodid V, in which the maxilliped of the male, unlike that of the female, has an extra row of spinules. With regard to the true host our study has identified the polychaete Hydroides elegans.

Copepodid stages of Lichomolgus forficula Thorell 1859 (Copepoda, Poecilostomatoida, Lichomolgidae), a copepod associated with Phallusia mammillata (Cuvier, 1815)

The five copepodids of Lichomolgus forficula, a poecilostomatoid copepod (family Lichomolgidae), are described. Sexual dimorphism first occurs in copepodid V in which the male maxilliped, unlike that of female, shows a row of spinules on its second segment. Changes of leg armatures during copepodid development are discussed.

Copepodid Stages of Paranthessius Anemoniae Claus, 1889 (Copepoda, Poecilostomatoida, Sabelliphilidae), a Copepod Associated With Aiptasia Diaphana (Rapp, 1829) of Lake Faro (Messina) Reared in the Laboratory

The five copepodids of Paranthessius anemoniae, a poecilostomatoid copepod (family Sabelliphilidae) reared in the laboratory, are described. Sexual dimorphism first occurs in copepodid V, in which the male and female maxilliped and endopodite of P1 are differently formed. With regard to the ethological characters of P. anemoniae, our observations agree with those of Bocquet & Stock ( 1959).