New records, external and internal anatomy, and systematic position of Hansen's y-larvae (Crustacea: Maxillopoda: Facetotecta)

@article{Grygier1987NewRE,
  title={New records, external and internal anatomy, and systematic position of Hansen's y-larvae (Crustacea: Maxillopoda: Facetotecta)},
  author={Mark J. Grygier},
  journal={Sarsia},
  year={1987},
  volume={72},
  pages={261-278}
}
Abstract Y-larvae comprise the crustacean taxon Facetotecta. A new kind of ‘nauplius y’, designated Type VI, is described from plankton in Disko Bay. West Greenland. The internal anatomy and some external features of ‘cypris y’ are described from a 2 μm-sectioned specimen collected in Oresund and from a whole-mounted specimen from Disko Bay. Newly discovered or reinterpreted features of ‘cypris y’ include: sessile compound eyes with tripartite crystalline cones; two pairs of eye-associated… 
Title Description and Complete Larval Development of a New Species of Baccalaureus ( Crustacea : Ascothoracida ) Parasitic in a Zoanthid from Tanabe Bay , Honshu
TLDR
The morphology of the adult females, nauplii, and ascothoracid larva is described based upon a detailed study combining light microscopy and SEM and much variability is recognized in the antennule, thoracopods, penis, and abdominal ornamentation.
Description and complete larval development of a new species of Baccalaureus (Crustacea: Ascothoracida) parasitic in a zoanthid from Tanabe Bay, Honshu, Japan.
TLDR
The present paper reports the first successful study of a generalized larval history in an Five adult females and one possible male of the new new species were collected from a single colony of Zoanthus sp, which is the first record of this zoanthid genus serving as the host of an ascothoracidan and the second species of Baccalaureus from Japan.
Tantulocarida (Crustacea : Maxillopoda) : a new taxon from the temporary meiobenthos
TLDR
It is suggested that Tantulocarida might be common representatives of the temporary meiobenthos and that their present species number represents only the tip of the iceberg.
Identification of Bifurcate Paraocular Process and Postocular Filamentary Tuft of Facetotectan Cyprids (Crustacea : Maxillopoda)
The ultrastructure of the bifurcate paraocular process and postocular filamentary tuft in an undescribed form of facetotectan cyprid from the North Pacific was examined using TEM. The bifurcate
Lattice organs and newly characterized submarginal pore-plates and pore-fields of the carapace in Ascothoracida (Crustacea: Thecostraca)
TLDR
Lattice organs on the dorsal part of the carapace were examined by scanning electron microscopy in females, males, and/or cypridiform ascothoracid-larva I stage, for the first time ever, and limits the potential utility of Ascothoracida as an out-group for polarizing lattice organ character-state variation in Cirripedia.
Naupliar Development of Hansenocaris furcifera Ito (Crustacea : Maxillopoda : Facetotecta) from Tanabe Bay, Japan
Five naupliar stages of Hansenocarisfurcifera Ito, 1989, the first of which is Nauplius y Type IX sensu Ito, are described in detail, based upon specimens originally collected in Tanabe Bay on the
Cypris morphology in the barnacles Ibla and Paralepas (Crustacea: Cirripedia Thoracica) implications for cirripede evolution
TLDR
In cypris morphology, Ibla and Paralepas show several synapomorphies with the clade comprising Rhizocephala and Thoracica and there are no specific apomorphicies with either the Acrothoracica, the RhizoCEphala or any particular subgroup within the ThorACica.
Parasitic Arthropods: A comparative zoological-palaeontological study
TLDR
A possible case of a giant larva from the Upper Jurassic Solnhofen Lithographic limestones (150 million years old, southern Germany), most likely representing an immature cirripede crustacean (barnacles and their relatives) is reported and possible ecological and physiological mechanisms leading to the appearance of giant larvae in other lineages are discussed.
Scanning electron microscopy of acrothoracican cypris larvae (Crustacea, Thecostraca, Cirripedia, Acrothoracica, Lithoglyptidae)
TLDR
Scanning electron microscopy was used to provide a full morphological description of cypris morphology in the acrothoracican species Lithoglyptes milis and L. habei and these synapomorphies support a monophyletic taxon Cirripedia comprising the Acrothoricica, Thoracica, and Rhizocephala but excluding the Ascothoracida.
...
...

References

SHOWING 1-10 OF 26 REFERENCES
Some observations on the internal morphology of Hansen's nauplius y (Crustacea)
TLDR
The morphological facts presented in this investigation indicate that the nauplius y, as knowledge stands today, is close to the Cirripedia, and a new dorsocaudal organ of doubtful function is described.
Nauplii, Antennular Ontogeny, and the Position of the Ascothoracida within the Maxillopoda
TLDR
The external anatomy of over 25 species of ascothoracid nauplii, and the later ontogeny of their antennules, are reviewed and compared to other maxillopodan subclasses to contradict a spermatology-based phylogeny of the Maxillopoda, but do not wholly resolve the AscothoracidaCirripedia relationship.
On the Anatomy of the Misophirioid Copepods, with Special Reference to Benthomisophria palliata Sars
TLDR
The misophrioids are a small but phylogenetically important order of copepods, comprising only three species, which exhibit a mosaic of characters drawn from both gymnoplean and podoplean lineages, which makes assessment of their affinities difficult.
Sperm morphology in Ascothoracida (Crustacea: Maxillopoda): confirmation of generalized nature and phylogenetic importance
TLDR
A comparative spermatological survey of ascothoracid crustaceans is presented, finding that several species of Dendrogaster have flagellate sperm with short heads and midpieces; their sperm may be secondarily shortened, and therefore less generalized than previously thought.
Isidascus bassindalei gen.nov., sp.nov. (Ascothoracida: Crustacea) from north-east Atlantic with a note on the origin of barnacles
  • J. Moyse
  • Biology
    Journal of the Marine Biological Association of the United Kingdom
  • 1983
TLDR
A case is made for interpretting the species as a protandrous sequential hermaphrodite, which forms permanent galls on the branches of Acanella arbuscula, a gorgonian of the Family Isidae (Octocorallia, Coelenterata).
Gorgonolaureus muzikae sp. nov. (Crustacea: Ascothoracida) parasitic on a Hawaiian gorgonian, with special reference to its protandric hermaphroditism
TLDR
A new ascothoracid parasite, Gorgonolaureus muzikae was found within cortical galls on specimens of a bathyal Hawaiian gorgonian, Placogorgia sp.
SPERM OF THE ASCOTHORACICAN PARASITE DENDROGASTER, THE MOST PRIMITIVE FOUND IN CRUSTACEA
TLDR
The hypothesis for the neotenic derivation of the Maxillopoda (Copepoda, Cirripedia and Ascothoracica, Mystacocarida, and Branchiura) from a eumalacostracan form is examined, and is found wanting.
Revision of Synagoga (Crustacea: Maxillopoda: Ascothoracida)
TLDR
This paper is a revision of the most primitive genus of the Ascothoracida, Synagoga Norman, and proposes a new genus, Waginella gen. nov, which is larger than S, mira and its appendages differ in minor respects.
14. Cypris y, a later developmental stage of nauplius y Hansen
TLDR
Although the larvae from the Bahamas show similarities to the preimaginal stages of Cirripedia and Ascothoracida, different features seem to be specific for the larvae in question.
Two New Deep-Sea Cirripedia (Ascothoracica and Acrothoracica) From the Atlantic
  • W. Newman
  • Biology
    Journal of the Marine Biological Association of the United Kingdom
  • 1974
TLDR
Two new deep-sea barnacles (Cirripedia) are described, one of which is remarkable in inhabiting a friable, clayey substrate and the other which is closely related to W. hessleri known from 1000 m off Bermuda and the two are unique in being the only true deep water members of the order.
...
...