Larval Stages of European Nemopterinae, with Systematic Considerations on the Family Nemopteridae (Insecta, Neuroptera)

1996 ◽  
Vol 43 (1) ◽  
pp. 99-121 ◽  
Author(s):  
V. J. Monserrat
Keyword(s):  
Larval Stages ◽  
The Family

Larval development of Metapenaeopsis barbata (de Haan, 1844) (Crustacea: Decapoda: Penaeidae)

1997 ◽  
Vol 48 (5) ◽  
pp. 401 ◽  
Author(s):  
Jesse D. Ronquillo ◽  
Toshio Saisho
Keyword(s):  
Morphological Characteristics ◽  
Larval Feeding ◽  
Feeding Apparatus ◽  
Filter Feeder ◽  
Closely Related Species ◽  
Larval Stages ◽  
Chaetoceros Gracilis ◽  
The Family ◽  
Gravid Females ◽  
Natural Means

Gravid females of Metapenaeopsis barbata spawned in the laboratory by natural means and the larvae were reared from hatching to postlarval stage at 27·0–29·8˚C and 33·5–34·5 g kg -1 salinity. The larvae metamorphosed into first postlarvae, with a survival rate of up to 98·4%, after about 10 days following hatching and subsistence on only an algal diet of Tetraselmis tetrathele and Chaetoceros gracilis. Six naupliar stages, three protozoeal stages, three mysis stages and the first postlarval stage are described and illustrated. On the basis of morphological characteristics, larval stages of M. barbata can be distinguished from similar stages of closely related species in the family Penaeidae. As inferred from the morphology of the larval feeding apparatus, M. barbata is still a filter-feeder even at the first postlarval stage.

The complete description of larval stages of the lobster shrimpLeonardsaxius amurensis(Kobjakova, 1937) (Decapoda: Axiidea: Axiidae) identified by DNA barcoding

2017 ◽  
Vol 98 (6) ◽  
pp. 1435-1453 ◽  
Author(s):  
Elena S. Kornienko ◽  
Darya D. Golubinskaya ◽  
Olga M. Korn ◽  
Svetlana N. Sharina
Keyword(s):  
Larval Development ◽  
Sequence Data ◽  
Molecular Genetic ◽  
Sympatric Species ◽  
Molecular Genetic Analysis ◽  
Mitochondrial Coi ◽  
Larval Stages ◽  
The Family ◽  
Rdna Sequence Data ◽  
First Time

The complete larval development of the lobster shrimpLeonardsaxius amurensis(Kobjakova, 1937) (Decapoda: Axiidea: Axiidae) is described and illustrated for the first time. The first zoeae of this species were collected from the plankton samples and reared in the laboratory before moulting to the megalopa. A molecular genetic analysis based on comparison of partial mitochondrial COI, 12S rDNA and 16S rDNA sequence data confirmed the identity of axiid larvae found in the plankton andL. amurensisadults collected in the same area. The larval development ofL. amurensisincludes five zoeal stages and a single megalopa. Zoeae I ofL. amurensisare characterized by the presence of one short posterodorsal spine on the fifth pleonite in contrast to the larvae of related sympatric speciesBoasaxius princepshaving four posterodorsal spines on the pleonites 2–5.Leonardsaxius amurensisoccupies an intermediate position between lobster shrimps with abbreviated pelagic development (2–3 zoeal stages) and species with long development (up to eight zoeal stages). Thus, the number of zoeal stages in the family Axiidae varies widely, similarly to that in the families Callianassidae and Upogebiidae.

Atypical reproduction in a syllid worm: the stolon of Syllis rosea (Annelida, Syllidae) takes care of its offspring

2020 ◽  
Vol 100 (2) ◽  
pp. 221-227
Author(s):  
Joachim Langeneck ◽  
Michela Del Pasqua ◽  
Margherita Licciano ◽  
Adriana Giangrande ◽  
Luigi Musco
Keyword(s):  
Parental Care ◽  
Sexual Reproduction ◽  
Reproductive Strategy ◽  
Reproductive Strategies ◽  
Congeneric Species ◽  
Reproduction Mode ◽  
Laboratory Rearing ◽  
Larval Stages ◽  
The Family ◽  
Reproductive Cycles

AbstractThe family Syllidae, aside from representing the most species-rich family in Annelida, is characterized by a number of sexual and asexual reproductive strategies. With the exception of a few viviparous species, the subfamily Syllinae is characterized by schizogamous reproduction with pelagic larval stages and without parental care. Laboratory rearing of ripe specimens of Syllis rosea showed a different reproductive strategy, hitherto unknown in this subfamily. While male stolons rapidly degenerated after fertilization, female ones released large eggs in a gelatinous cluster attached to the middle-posterior chaetigers. The gel mass progressively compacted as a cocoon wrapped by the stolon body; 7 days after the deposition the larvae hatched out from the cocoon at the metatrochophore stage and the female stolon died after a few days. After hatching the larvae remained associated to the stolon, and young specimens of S. rosea survived up to the 3-chaetiger stage. Until now cocoon brooding by the stolon has only been reported for some Autolytinae. The production of gelatinous egg masses and parental care are known in basally branching clades within Syllidae, suggesting that this reproduction mode might retain some ancestral features. The scarce knowledge about reproductive cycles in Syllinae does not allow clarification whether this strategy is unique for S. rosea, or it occurs in other congeneric species. Further research is needed to understand possible relationships between sexual reproduction and phylogeny, stolon morphology and its adaptation to parental care, and ultimately between reproductive strategies and ecology.

The life cycle of Parvatrema homoeotecnum sp.nov.(Trematoda: Digenea) and a review of the family Gymnophallidae Morozov, 1955

Parasitology ◽  
1964 ◽  
Vol 54 (1) ◽  
pp. 1-41 ◽  
Author(s):  
B. L. James
Keyword(s):  
Life Cycle ◽  
Intermediate Host ◽  
Technical Assistance ◽  
Littorina Saxatilis ◽  
Free Living ◽  
Diagnostic Features ◽  
Late Professor ◽  
Larval Stages ◽  
The Family ◽  
Haematopus Ostralegus

1. Parvatrema homoeotecnum sp.nov. from the oystercatcher, Haematopus ostralegus occidentalis Neumann at Aberystwyth is described and compared with other species of the genus.2. The life cycle of this species is unique. The larval stages occur in the gastropod, Littorina saxatilis (Olivi) subsp. tenebrosa (Montagu) and include germinal sacs which have a structure and development similar to an adult digenean. There are no free-living stages and only one intermediate host.3. The significance of this unique life cycle is discussed.4. The family Gymnophallidae Morozov, 1955, is reviewed. Emended definitions are given for the family, subfamilies and genera. Keys, diagnostic features and brief notes of the species are included.I am very grateful to Dr Gwendolen Rees, who suggested the investigation which led to the discovery of this species, for her advice and indispensable assistance throughout the work and the preparation of this paper. I am also grateful to the late Professor T. A. Stephenson for his interest and for the provision of working facilities; to Mr W. A. Ballantine, Mr A. H. Clarke, Jr., Mr C. Curtis, Miss G. P. F. Evans, Dr V. Fretter, Professor L. A. Harvey, Mr D. H. Jones and Dr J. Lewis who sent me specimens of Littorina saxatilis; to Professor R. M. Cable and Emerit. Professor G. R. La Rue for helpful suggestions; to Mr J. R. Hirst and Mr D. Hemingway Jones for photographic and technical assistance and to the Department of Scientific and Industrial Research for a grant which made the work possible.

An oribatid mite, Hydrozetes lemnae (Hydrozetidae) on farmed eels Anguilla australis and A. dieffenbachii (Anguillidae)

2019 ◽  
Vol 24 (10) ◽  
pp. 1809-1813
Author(s):  
Qing-Hai Fan ◽  
Philip Heath
Keyword(s):  
New Zealand ◽  
Oribatid Mite ◽  
Mite Species ◽  
Potential Significance ◽  
Larval Stages ◽  
Anguilla Australis ◽  
The Family ◽  
Oribatid Mite Species

An oribatid mite species found infesting the farmed eels Anguilla australis and A. dieffenbachii (Anguillidae) in New Zealand was identified as Hydrozetes lemnae in the family Hydrozetidae (Acari: Sacoptiformes). All post larval stages have been detected and identified. The potential significance of the mites to the farmed eels is discussed.

scholarly journals The Larval Stages of Balcis alba and B. devians

1935 ◽  
Vol 20 (1) ◽  
pp. 65-69 ◽  
Author(s):  
Marie V. Lebour
Keyword(s):  
Larval Stages ◽  
The Family

The young stages of the members of the family Eulimidæ are little known, the only reference to any species apparently being that of Loven (1844) who briefly notes and figures a veliger which he attributes to Eulima distorta (=Balcis devians). This has a very oblique shell and was probably a week or two old. A comparison of this figure with the apex of Balcis devians from Plymouth and its larvæ in the plankton makes one rather uncertain of its identity but shows that even in those early times it was known that a Eulima could remain some time in the plankton as a veliger.

Additions and Revisions to the Genera of North American Caddisflies of the Family Brachycentridae With Special Reference to the Larval Stages (Trichoptera)

1965 ◽  
Vol 97 (10) ◽  
pp. 1089-1106 ◽  
Author(s):  
Glenn B. Wiggins
Keyword(s):  
New Species ◽  
North American ◽  
Larval Stage ◽  
New Genus ◽  
New Genera ◽  
Larval Morphology ◽  
Larval Stages ◽  
The North ◽  
The Family ◽  
A New Species

AbstractLarval characterizations for the genera of North American Brachycentridae are revised and two new genera created, bringing to five the total number now recognized on this continent. Previous concepts of larval morphology inMicrasemaare emended. Discovery of the larval stage ofBrachycentrus(Amiocentrus)aspilusRoss necessitates elevation of this subgenus to generic status. Association of larvae with the two North American species placed inOligoplectrumnecessitates removal of one,O.dimicki(Milne), toMicrasema. Discovery of all stages of a new species on Mount Hood, Oregon, necessitates creation of a new genus. A provisional larval key to the genera of the North American Brachycentridae is proposed and the phylogenetic relationships of the genera are discussed. Validity of the Asian genusOligoplectrodesis questioned.

scholarly journals The larval sensilla on the antennae and mouthparts of five species of Cossidae (Lepidoptera)

2017 ◽  
Vol 95 (9) ◽  
pp. 611-622 ◽  
Author(s):  
Lili Xu ◽  
Jiahe Pei ◽  
Tao Wang ◽  
Lili Ren ◽  
Shixiang Zong
Keyword(s):  
Maxillary Palp ◽  
Forest Pests ◽  
Sensilla Basiconica ◽  
Larval Stages ◽  
Sensilla Styloconica ◽  
The Family ◽  
Sensillum Styloconicum ◽  
New Hosts ◽  
Wood Boring ◽  
Maxillary Palps

Most species in the family Cossidae can migrate from one host to a new one in later larval instars, which is different from other bark- and wood-boring insects. In this study, we selected Eogystia hippophaecolus (Hua, Chou, Fang and Chen, 1990), Deserticossus artemisiae (Chou and Hua, 1986), Deserticossus arenicola (Staudinger, 1879), Yakudza vicarius (Walker, 1865), and Streltzoviella insularis (Staudinger, 1892) to understand how these species locate new hosts in their larval stages. Scanning electron microscopy (SEM) was used to determine the typology, morphology, number, and distribution of sensilla on the antennae, maxillary palps, galeas, and labial palps of these five species. There were no differences in typology, morphology, and number of sensilla between the five species. We observed antenna with three to four short sensilla basiconica, two sensilla chaetica, four sensilla basiconica, and one sensillum styloconicum. The maxillary palp had seven short sensilla basiconica, one sensillum digitiformium, and two sensilla placodea. The maxillary galea had three short sensilla basiconica, two sensilla styloconica, and one sensillum chaeticum. The labial palp had one short sensillum basiconicum and one sensillum styloconicum. Our results will provide a basis for further studies on the feeding, host-transfer behaviors, and electrophysiology of this group of forest pests.

scholarly journals Notes on the early stages of the commensal polynoid Acholoë Astericola (Delle Chiaje)

1954 ◽  
Vol 33 (1) ◽  
pp. 123-127 ◽  
Author(s):  
Demorest Davenport
Keyword(s):  
New England ◽  
Life Histories ◽  
Puget Sound ◽  
Personal Communication ◽  
Larval Stages ◽  
Early Stages ◽  
The Family ◽  
Made In

Little is known about the development of polynoids. A large number of unidentifiable polynoid trochophores and nectochaetes have been described by Nolte (1936) and others. As Thorson (1946) states, Nolte has done little to clear up the confusion that prevails in this group and his 'numerous figures, all more or less incorrect, and accordingly difficult to recognize, merely serve to further obscure our picture'.A search of the literature with the aid of Hartman (1951) has so farrevealed only one clearly identifiable member of the family whose early larval stages have been described. Sars (1845a, b), making some of the earliest observations on polychaete life histories, described under the name Polynoe cirrata Fab. the early stages of Harmothoe imbricata (L.). Further studies in some detail on this or a closely allied species were made in turn by Miiller (1851), Mclntosh (1900) and Izuka (1912). The certainty of identification of the parent in this case stemmed from the fact that the early stages, with the exception of those studied by Miiller, were not taken in the plankton but were observed attached to the brooding parent after release from it. In this polynoid the eggs are carried in large masses beneath the elytra, and larvae leave the parent as actively swimming trochophores. This method of carrying the young has also been observed in H. imbricata by Saemundsson (1918) in Greenland and by M. Pettibone (personal communication) in Puget Sound. Desor (1857) quotes the observations of Sars on the brooding habit, and describes the release of trochophores by Polynoe squamata (= Lepidonotus squamatus L. ?) on the New England coast.

Parasitic Helminths and Arthropods from Pinnipedia of the Canadian Pacific Coast

1956 ◽  
Vol 13 (4) ◽  
pp. 489-505 ◽  
Author(s):  
Leo Margolis
Keyword(s):  
Pacific Coast ◽  
Host Record ◽  
Phoca Vitulina ◽  
New Combination ◽  
New Host ◽  
Parasitic Helminths ◽  
Larval Stages ◽  
New Host Record ◽  
The Family ◽  
Contracaecum Osculatum

From Phoca vitulina richardi the following parasites are recorded: Corynosoma strumosum (Acanthocephala); Terranova decipiens and Contracaecum osculatum (Nematoda); Halarachne sp. (Acarina); Echinophthirius horridus (Anoplura). From Eumetopias jubata are recorded Diphyllobothrium pacificum, Diplogonoporus tetrapterus and Abothrium gadi (Cestoda); T. decipiens, C. osculatum and Parafilaroides sp. (Nematoda); Corynosoma villosum (Acanthocephala); Orthohalarachne diminuata (Acarina): Antarctophthirus microchir (Anoplura). E. jubata is probably not a true host of A. gadi, the parasite apparently being introduced by ingestion of infected fishes of the family Gadidae, the normal definitive hosts. Notes on host and geographical distribution, nomenclature and morphology of the parasites are included. Diphyllobothrium pacificum is a new combination for Adenocephalus pacificus. E. jubata is a new host record for D. pacificum, D. tetrapterus and O. diminuata. Several new geographical records are reported. The occurrence of larval stages of T. decipiens and C. strumosum in fishes is noted.

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