摘要:

Arenonemertes arenicolussp.n. is described from the Gullmar Fjord, Sweden. It differs fromA. micropsFriedrich, 1933 in: (1) lacking cephalic glands, (2) having an undivided caecum on the midgut, whereas the caecum is divided into three lobes inA. microps, and (3) the position of the nephridial ducts in relation to the lateral nerves (dorsal instead of ventral). Arenonemertes microps is still considered a valid species, but it is poorly described and the type material has been lost.

ISSN:0300-3256    

DOI:10.1111/j.1463-6409.1991.tb00270.x

出版商:Blackwell Publishing Ltd    

年代:1991

数据来源: WILEY

摘要:

Tunqua tiara(von Linstow, 1879) Blanchard, 1904 from the stomach of the Nile monitor lizard (Varunus niloticus) in Nigeria is redescribed in detail using both light and scanning electron microscopy. Its mode of attachment and host pathology are described and discussed. A list of hosts and localities from whichT. tiarahas been recovered is included.

ISSN:0300-3256    

DOI:10.1111/j.1463-6409.1991.tb00271.x

出版商:Blackwell Publishing Ltd    

年代:1991

数据来源: WILEY

摘要:

The three species of the genusElaphostrongylusoccurring in Norway. namely,E. cervi, E. rangiferiandE. alcesfromCervus elaphus, Rangijer tarandusandAlces alcesrespectively are redescribed and figured using light and scanning electron microscopical techniques. The taxonomic status of the three species is reviewed and their validity confirmed.

ISSN:0300-3256    

DOI:10.1111/j.1463-6409.1991.tb00272.x

出版商:Blackwell Publishing Ltd    

年代:1991

数据来源: WILEY

摘要:

The anatomy of the hydrothermal vent gastropod Provanna is described. It is shown to be a primitive neotaenioglossan with mainly plesiomorphic features in all systems, including open pallial gonoducts, epiathroid nervous system with accessory pedal ganglia and a circulatory system where a considerable portion of the venous blood from the coelomic spaces enters the pallial skirt. Apomorphic features include the possession of an anterior notch, or short canal in the shell (and mantle edge), an annulated sensory pallial tentacle, paraspermatozoa modificd as nurse cells. multiple seminal receptacles, a posterior bursa copulatrix, and a renal oviduct with three distinct regions. the middle one expanded. Comparisons are madc with Abyssochrysos, a genus assumed to be a relict member of the Loxonematoidea, which appears to be the closest known relative. A new family. Provannidae fam.n., is created and tentatively included in the Loxonematoidea. The following new specics are described: Provanna segonzaci sp.n. (from hydrothermal vents at the Fiji Back Arc), P. laevis sp.n. (from hydrothermal seeps in the Gulf of California), P. sculpta sp.n. and P. admetoides sp.n. (from hydrocarbon seeps in the Gulf of Mexico). New records are added for previously described species of Provanna.

ISSN:0300-3256    

DOI:10.1111/j.1463-6409.1991.tb00273.x

出版商:Blackwell Publishing Ltd    

年代:1991

数据来源: WILEY

摘要:

The spiny lobsterPanulirus argushas a life cycle consisting of a long‐term (∼9‐12 months) planktonic larval period with 11 larval stages (the phyllosoma), a short (<1 month?) planktonic‐to‐benthic transitional postlarval stage (the puerulus), and benthic juvenile and adult phases. The mouthparts and foregut during these stages were examined and described by means of scanning electron microscopy (SEM) in an investigation of the species' developmental morphology, diet, and ecology. The phyllosoma mouthparts close to the esophagus are the labrum, mandibles, paragnaths, and first maxillae. The second maxillae and first and second maxillipeds are increasingly distant from the esophagus as the larva develops. The pair of asymmetrical mandibles bear many teeth and spines, and the molar processes form what appears to be an intricate toothed shear. The mandibles remain similar throughout the phyllosoma stages. During the molt into the puerulus, the mouthparts are greatly changed, and the second maxilla and the three maxillipeds join the other mouthparts near the esophagus. However, the transformation appears incomplete, and many of the mouthparts are not fully formed until the molt to juvenile completes their development. The phyllosoma foregut lacks a gastric mill and has but one chamber. In addition, the first two stages lack a gland filter. During the molt to puerulus, the foregut is greatly changed and subsequently is similar to typical decapod foreguts in having an anterior cardiac and posterior pyloric chamber. Only rudimentary internal armature is present. Following the molt to juvenile, the foregut is quite similar to that of the adult, which exhibits a substantial gastric mill. The 11 phyllosoma stages were separated into two groups (group A = stages 1‐5, group B = stages 6‐11) on the basis of changes in both mouthpart and foregut morphology. The puerulus has never been observed to feed. Nothing was observed in our investigations that would prevent feeding, though both mouthpart and foregut development appeared incomplete. The mouthpart and foregut structures of larval, postlarval and juvenileP. argusdiffer widely, possibly reflecting the extreme modifications for different habitats found among thes

ISSN:0300-3256    

DOI:10.1111/j.1463-6409.1991.tb00274.x

出版商:Blackwell Publishing Ltd    

年代:1991

数据来源: WILEY

摘要:

Keys are given to distinguish the Neotropical Diaphorininae (Katacephala Crawford, NotophorinaBurckhardt andAllophorina gen.n.). Description and keys are given to the species ofKatacephalaandAllophorina. KatacephalaCrawford comprises six species,grandicepsCrawford (the type species),tenuipennisTuthill,arcuataCrawford,psidii(Tuthill) comb.n.,cinctatasp.n. andanomalasp.n.JenseniellaTuthill is synonymized withKatacephala. Katacephala fasciataJensen is synonymised with K.arcuataCrawford. Known host‐plants are all Myrtaceae.Allophorinacomprises two species,lobatasp.n. (the type species) andunasp.n. Its host‐plant relationships are unkn

ISSN:0300-3256    

DOI:10.1111/j.1463-6409.1991.tb00275.x

出版商:Blackwell Publishing Ltd    

年代:1991

数据来源: WILEY