Giuseppe Costanzo

MEDITERRANEAN SPECIES OF THE GENUS PONTONIA LATREILLE, 1829. I. DEVELOPMENTAL STAGES OF PONTONIA PINNOPHYLAX (OTTO, 1821) (DECAPODA, NATANTIA, PONTONIINAE) REARED IN THE LABORATORY

[Description du developpement larvaire de Pontonia pinnophylax. Les stades ont ete obtenus en laboratoire et en presence de Pinna nobilis. Celle-ci a ete collectee dans le detroit de Messine a environ 15 metres de profondeur. Les resultats ont indique huit stades zoe et un stade postlarvaire., Description du developpement larvaire de Pontonia pinnophylax. Les stades ont ete obtenus en laboratoire et en presence de Pinna nobilis. Celle-ci a ete collectee dans le detroit de Messine a environ 15 metres de profondeur. Les resultats ont indique huit stades zoe et un stade postlarvaire.]

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).

Seasonal Fluctuation of Modiolicola Insignis Aurivillius, 1882 (Copepoda: Poecilostomatoida: Sabelliphilidae), Associated with Mytilus Galloprovincialis in Lake Faro (Messina)

ABSTRACT The authors report on the seasonal fluctuation of the poecilostomatoid copepod Modiolicola insignis associated with Mytilus galloprovincialis, living in Lake Faro (Messina). The copepod has four generations a year, seasonally succeeding each other. The cycle that takes place during summer has the highest number of individuals. By examining the sex ratio, we noticed a prevalence of males from May to August and of females from October to April, with the exception of November. It is possible to find ovigerous females as well as males all year. The largest number of females corresponds to that of males, occurring a month earlier than that of copepodids.

Two new species of asterocherid (Copepoda: Siphonostomatoida) associated with a sponge from the Strait of Messina, Italy: taxonomic and ecological traits

Two new species of asterocherid associated with sponges are described from the Mediterranean Sea. They are Psilomyzon laetitiae sp. nov. and Psilomyzon sarcotragusicola sp. nov. The genus Psilomyzon consists of only one known species, P. pauciseta. The two new species can be easily distinguished from the cogener species by reduction of the endopod of leg 4. In P. pauciseta the leg 4 endopod is 3-segmented, with the third segment reduced; in both new species it is 2-segmented, with the second segment carrying an inner projection, possibly homologous to the third segment of the leg 4 endopod of P. pauciseta. In the two new species, the bifid outer process on male leg 4 second endopodal segment seems to be serially homologous to the similar processes on the same segment in legs 1–3, whereas the inner projection may represent a vestigial element of the third endopodal segment of leg 4. http://zoobank.org/urn:lsid:zoobank.org:pub:33BF0653-BBA9-426B-B365-5D8C62DFD44A