摘要:

Three monogenetic and 23 digenetic trematodes of amphibians and reptiles are reported from Taiwan, 14 for the first time. One new family and genus and five new species of Digenea are described: Omphalometridae,Leurosoma taiwanensesp.n. fromBufo bufo bankorensis;Dicrocoeliidae,Paradistomum taiwanensesp.n. fromNatrix stolata;Ocadiatrematidae,Ocadiatrema taiwanensefam. gen. et sp.n. fromOcadia sinensis;Lecithodendriidae,Prosthodendrium (Paralecithodendrium)taiwanensesp.n. fromOcadia sinensis;Pleurogenidae,Nenimandijea taiwanensesp.n. fromRana plancyi fukienensis.

ISSN:0300-3256    

DOI:10.1111/j.1463-6409.1981.tb00493.x

出版商:Blackwell Publishing Ltd    

年代:1981

数据来源: WILEY

摘要:

The following body parts of the fish nematodeThynnascaris aduncawere studied by using SEM and TEM: anterior and posterior ends, digestive tract, particularly the oesophagus and its glandular tissue, male and female reproductive organs, excretory and nervous systems, and body wall. The ova in the uterus of a female studied by SEM were found to contain II‐stage larvae: this is at variance with previous reports. Contrary to accepted views, each body wall muscle was found to have more than one process (“arm”) reaching the dorsal/ventral

ISSN:0300-3256    

DOI:10.1111/j.1463-6409.1981.tb00494.x

出版商:Blackwell Publishing Ltd    

年代:1981

数据来源: WILEY

摘要:

The path taken by the faecal groove, following two right angle bends, appears inefficient in Sabellidae. It fits well with the thoracic folds of serpulids and follows a gentle spiral in caobangiids, but only in spirorbids is it of obvious adaptive value, being suited to life in a coiled tube. The associated setal inversion is not necessary for locomotion, which does not depend wholly on setal leverage, except in the smaller Fabriciinae where long‐shafted uncini also thrust actively against the elastic tube wall. The collar setae of spirorbids and some serpulids thrust anteriorly, giving some backward movement, but such motion is mainly by body contraction. Short uncini are virtually passive, engaged by opposing setae acting as distance pieces. Some broad bladed setae have a hollow structure around a central core. Pick‐axe setae of Sabellinae may have developed to counteract the thrust of respiratory peristalsis. This is not seen in spirorbids and serpulids, the thoracic folds of which are a sufficient respiratory supplement to the tentacles. — Numbers of thoracic segments in Sabellidae range from 1 to 16, and the abdomen becomes vestigial in some Fabriciinae. Abdominal inversion is important to spirorbids but not to sabellids, which are more varied. It seems that the former are archaic and the latter had a coiled ancestry. Sabellariids also show abdominal inversion suggesting a distant relationship with Sabe

ISSN:0300-3256    

DOI:10.1111/j.1463-6409.1981.tb00495.x

出版商:Blackwell Publishing Ltd    

年代:1981

数据来源: WILEY

摘要:

FiveHalacarusspecies were found in deep sea collections of the Woods Hole Oceanographic Institution, Woods Hole, Massachusetts. The five species, viz.Halacarus atlanticussp.n.H. longiorsp.n.H. obtusussp.n.H. peregrinussp.n. andH. triunguissp.n. are described, and discussed in terms of related species.

ISSN:0300-3256    

DOI:10.1111/j.1463-6409.1981.tb00496.x

出版商:Blackwell Publishing Ltd    

年代:1981

数据来源: WILEY

摘要:

The microscopic anatomy of the extraocular eye muscles of the sharkScyliorhinus caniculais described. In contrast to swimming muscles, the fibres are not differentiated into distinct fibre type groups. The sarcoplasmic reticulum has narrow terminal cisternae in the Z band region, longitudinal tubules and a fenestrated cisterna in the H band region. Triads or dyads are mostly located at the Z discs. A number of variations from this general pattern is described, with main emphasis on triad location, orientation and structure. Since triads in vertebrates usually are located either at the Z disc or at the A‐I junction, and with a fixed structure, these variations in shark muscles are of phylogenetic interest, as they may provide basis for an explanation of development to the two different triad location

ISSN:0300-3256    

DOI:10.1111/j.1463-6409.1981.tb00497.x

出版商:Blackwell Publishing Ltd    

年代:1981

数据来源: WILEY

摘要:

The structure of the intestine and its adnexa in the Australian lungfishNeoceratodus forsteri(Krefft), is described from four adult specimens and compared with that of other lungfish. In all lungfish genera the intestine is thick and straight and contains a complicated spiral valve; a pyloric fold separates the foregut from the midgut. InNeoceratodusthe coiling of the intestinal lumen begins in the prepyloric or gastric region, unlike in other vertebrates with a spiral valve, where it begins behind the pylorus. The spiral valve ofNeoceratodusbegins as a deep groove on the right side of the foregut, just behind the glottis. Such a prepyloric groove is present but poorly developed also in the lungfishesProtopterusandLepidosirenand contains a prepyloric spleen in all genera. A separate postpyloric spleen is situated in the free margin of the spiral valve, i.e. in the axis of the intestine. The spleen has a heavily pigmented cortex containing large amounts of iron. The pancreas, buried in the spiral valve in front of the pylorus inNeoceratodus, contains numerous islets of Langerhans, similar to those of tetrapods. This is unexpected because the islets ofProtopterus, described by Gabe in 1969, are more like the large, encapsulated “Brockmann bodies” of teleo

ISSN:0300-3256    

DOI:10.1111/j.1463-6409.1981.tb00498.x

出版商:Blackwell Publishing Ltd    

年代:1981

数据来源: WILEY