Showing papers in "Zoological Journal of the Linnean Society in 1990"

TL;DR: Four derived pneumatic characters suggest that the Palaeognathae (ratites and tinamous) is monophyletic within Neornithes, and within avian phylogeny, Ornithurae and Neorn ithes are well–supported by pNEumatic synapomorphies.

TL;DR: In those families where the reduction of the medusa can be analysed, it is shown that the reduction occurred after all synapomorphies defining the genera had evolved and usually affected individual species within a genus rather than the original species from which the other species in the genus evolved.

TL;DR: The economically important African catfish genus Heterobranchus has been revised using biometrical and osteological features and four species are recognized as valid: H. isopterus, H. longifilis and H. boulengeri.

TL;DR: Comparison with known choristoderes, based on an analysis of 53 derived character states, suggests that Ctemogenys is the most primitive of known genera, which supports recent analyses which conclude that Champsosaurus and Simoedosaurus are derived from archosauromorph diapsids, not lepidosauromorphics as once thought.

TL;DR: A review of neontological and palaeontological evidence regarding this element in mammals supports the following conclusions: monotremes have a true septomaxilla resembling that known for non-mammalian therapsids and some Mesozoic mammals.

TL;DR: Some features, such as the prominence of the conus of the right ventricle in animals that leap, dig or sprint regularly as part of their defence mechanism and a long, narrow left ventricles in endurance performers may be more closely related to activity than ancestry, and lastly some characteristics may be pleiotropic effects of thoracic morphogenesis.

TL;DR: The kinematics of tongue projection by terrestrial adult California newts, Taricha torosa (Rathke, 1833), are described based upon high-speed cinematography and key anatomical correlates of projection are described, with special emphasis on the mobility of the hyoid arch.

TL;DR: An hypothesis is presented to explain differences in incisor morphology based on the use of the teeth for purposes other than eating and the alternative biological role has implications for theUse of dental characteristics in the determination of the feeding ecology of living and extinct ruminants.

TL;DR: Quantitative and qualitative analyses of filming studies reveal that fundamental differences exist between the gaits of the New Zealand fur seal and the Hooker's sea lion; selection for the behavioural control of terrestrial locomotion has apparently preceded structural modifications.

TL;DR: New well-preserved specimens of Peltopleurus lissocephalus Brough, 1939, a small actinopterygian fish of the Alpine Middle Triassic, are described, showing a highly modified anal fin, with a brush-shaped holdfast device and a gonopodium-like structure, possibly used during mating behaviour.

TL;DR: The conservative nature of a dipteran of such antiquity, assignable to an extant genus which has an association with flowers, has implications for evolutionary theory, and the single specimen puts the origin of the subfamily Limoniinae and the genus well into the Cretaceous Period, and provides data on the southern African Cret Jurassic palaeoenvironment.

TL;DR: A study of the interrelationships of selected hyaenid taxa using numerical cladistic methods finds that Hyaena hyaena and H. brunnea are not sister-groups, and the genus Parahyaena is resurrected for the latter species.

TL;DR: Nineteen species of chromodorid nudibranchs from the Indo-West Pacific are described including 12 new to science and the problematical ‘Hypselodoris’ kulonba Burn, 1966 is shown to belong to the genus Digidentis.

TL;DR: Parallels in other moth groups are cited to support the notion that a plesiomorphic courtship pheromone system could persist in a vestigial state, despite the loss of its adaptive raison detre.

TL;DR: The benthic deep-sea class Sorberacea (Tunicata) is revised, all known species are redescribed and figured and seven new species are added and a comparison with Ascidiacea is given.

TL;DR: It is concluded that gadoids have evolved with the Atlantic continental shelves and their distribution (and bipolarity) is a consequence of the geological processes which have formed the Atlantic Ocean.

TL;DR: A new genus and species of monostiliferoidean enoplan nemertean from Alaska is described and illustrated and was found on the egg mass of a red king crab.

TL;DR: A new family is proposed for Hatnondia superba gen. nov., a shield-shaped harpacticoid collected from washings of sponges from Port Phillip, Australia, and it is suggested that the Rhynchothalestrinae represent an early offshoot in the evolution of the Thalestridae.

TL;DR: The correlation of the shape of the vomer and fine-scale resource partitioning suggests that this structure may be important in the evolutionary success of the group and most structural shape variation in neurocranial morphology is associated with structural variation in buccal jaws.

TL;DR: Three species of blind Amphipoda are recorded from anchihaline cave waters in the Galapagos Islands; one of these, Galapsiellus leleuporum, was previously know from the islands; the male is described for the first time.

TL;DR: The occurrence of villi (outgrowths, projections) on the bases of the basalmost downy barbulcs of breast-feathers is documented with scanning electron microscopy, and the presence of these structures is thought to constitute a synapomorphic character for Passer birds, which once more casts suspicion on the monophylv of Wetmore's order Piciformes.

TL;DR: It is difficult to explain the evolutionary origin of the cornua trabecularum, and comparisons based on isolated sphenethmoids reveal close morphological and developmental similarities only between anurans as a whole and Palaeoherpeton.

TL;DR: Six species now placed in the gastropod family Naticidae are identified based on critical re-examination of original descriptions and original specimens in the Linnean Society of London and the Zoologiska Museet of Uppsala Universitet.

TL;DR: The genus Sige Malmgren, 1865 is revised and the type species S.fusigera Malmgrene is redescribed from syntypes and newly collected topotype material.

TL;DR: Dicranopteron Schmitz is removed from the Metopininae and three new species are described, represented by females only and come from Odontolermes and Macrotermes nests in the Orient.

TL;DR: It was concluded that postcanine tooth size was unrelated to body length or weight, and poorly correlated to skull length or jaw size, although viscerocranial size appears to be independent of body size.

TL;DR: The ultrastructure at ‘the line of weakness’ in the male puparium of Elenchus tenuicornis (Kirby) (Insecta: Strepsiptera) had an undifferentiated epicuticle, an untanned exocuticles and a loose textured endocuticle.