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A redescription of Trebius shiinoi Nagasawa, Tanaka & Benz, 1998 and descriptions of its developmental stages, nauplius I and II, copepodid I, II (female), III (female), IV (female) and V (male) are presented based on specimens obtained from the Japanese angelshark, Squatina japonica Bleeker, 1858, captured at Seto and Kushimoto, Wakayama Prefecture, Japan, in 1971-1972. The family is the second representative of the Siphonostomatoida known to have nauplii with spatulate balancers, next to Caligidae. However, T. shiinoi also differs significantly from caligids in lacking a chalimus phase in its life cycle. The postnaupliar development of the species involves a single morphological leap, which takes place through a moult from copepodid II to III, and then development proceeds linearly up to the adult. The majority of the copepodids I found appear to have already been grasped by an adult male each (precopulatory mate guarding). Copepodid II exhibits sexual activity by the possession of a spermatophore receptacle in the female. Copepodids after copepodid III are caligiform, having marginal membranes on the cephalothrax, as in the adult. Copulation takes place at least in copepodid III and/or IV, and the spermatozoa discharged are stored in the genital antra to later fertilize the ova in the adult. Judging from the fact that in the adult female a spermatophore receptacle is absent, it is deducible that no copulation is taking place in the adult stage. This reproductive process is unique in the Copepoda. © 2013 Koninklijke Brill NV, Leiden.

Five naupliar stages and the infective copopodid stage of Eudactylina dasiati Izawa, 2011, Dangoka japonica Izawa, 2011, and an unidentified eudactylinid species are described based on free-living larvae reared from eggs detached from ovigerous females, which were recovered from the branchial lamellae of Japanese elasmobranchs, Dasyatis akajei (Müller Henle, 1841) (Dasyatidae), Rhinobatos schlegelii Müller & Henle, 1841 (Rhinobatidae), and Alopias vulpine (Bonnaterre, 1788) (Alopiidae), respectively. These species of Eudactylinidae, along with Gangliopus pyriformis Gerstaecker, 1854 (Pandaridae) are the only Siphonostomatoida known to have five naupliar stages prior to the infective copepodid I. Naupliar morphology and the antennular segmentation in the Siphonostomatoida are discussed. Siphonostomatoid nauplii may possess six caudal elements and limb buds of the maxillae, maxillipeds, and two legs, but not maxillules. In the Siphonostomatoida, the naked first antennular segment of the nauplius may be retained to the adult stage. © 2012 Koninklijke Brill NV, Leiden.

Nine species of Hatschekiidae are (re-)described from Japanese actinopterygian fishes belonging to Ophidiiformes, Beryciformes and Scorpaeniformes. They are Hatschekia anomalis sp. Nov., Hatschekia bifurcata Yamaguti & Yamasu, 1959, H. couardi Nunes-Ruivo, 1954, H. fusiformis Shiino, 1957, H. Hoplobrotulae sp. Nov., H. multibarbatae sp. Nov., H. tenuis (Heller, 1865), Prohatschekia awatati (Yamaguti, 1939), and P. Neobythitesi sp. Nov. The first species is recovered from an unusual site of the host. In H. couardi and P. awatati the males are described for the first time and the possession of the naked first antennular segment is confirmed in both sexes of these species. The Hatschekiidae have paired seminal receptacles in the female and adopt the eudactylinid type of insemination mode, though exhibiting variation of the insemination procedure. It can be concluded that the insemination modes link up with the female genital system in the Siphonostomatoida. © 2015 Koninklijke Brill NV, Leiden.

A series of descriptions of postembryonic developmental stages prior to the adult of Hatschekia multibarbatae Izawa, 2015 is presented based on free-living larvae reared from eggs detached from ovigerous females, as well as on copepodids I-V recovered together with adults from Brotula multibarbata Temminck & Schlegel, 1846 (Pisces, Ophidiiformes, Ophidiidae). The number of naupliar stages preceding the infective copepodid I is three in this species. The postnaupliar development proceeds linearly, up to the adult. © Koninklijke Brill NV, Leiden, 2015.

Free-living stages, comprising two naupliar stages and the infective copepodid I, of the parasitic copepod Lernanthropinus labracoglossae Izawa, 2014 are described. The larvae were reared from eggs detached from an ovigerous female, recovered from the branchial lamellae of the Japanese actinopterygian fish Labracoglossa argentiventris Peter, 1866 (Kyphosidae). The number of naupliar stages prior to copepodopid I in the Lernanthropidae is the same as in the Caligidae, Pseudohatschekidae and Trebiidae. The copepodid I of the species has a frontal filament, as do representatives of the Caligidae, Pandaridae and Trebiidae. However, this is regarded as a vestigial feature in the last two families. Copepodid I of L. labracoglossae has a 6-segmented antennule, including the naked first segment, as do the first copepodids of eudactylinid copepods. © Koninklijke Brill NV, Leiden, 2014.

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