590 Tiere (Zoologie)
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ZOOLOGISCHER JAHRESBERICHT 1881: Verf. untersuchten einen im Zoologischen Garten in Antwerpen gestorbenen erwachsenen africanischen Elefanten , dessen Haut und Skelet an das Brüsseler Museum kam. Auge. Die knorplige Stütze der Nickhaut verlängert sich stielförmig nach hinten an der inneren Seite des Bulbus. Die Nickhaut wird durch zwei selbständig am hinteren Ende des Stiels entspringende Muskeln bewegt, welche sich vorn oben uud unten in den orbicularis palpebrarum ansetzen. Ein rectus posterior (s. choauoideus, s. retractor) fehlt. Statt der fehlenden Thränendrüse ist die, dem Stielende der Nickhaut anliegende Hardersche Drüse sehr entwickelt. Das Auge ist nicht größer als das des Pferdes, die Orbita aber viel weiter, die Muskeln viel dicker. — Das Herz ist breit , die Umrisse fast viereckig (in der schematischen Lage des menschlichen Herzens) , die breit abgerundeten unteren Enden der Ventrikel durch eine tiefe Furche getrennt (an injicirten Präparaten, ähnlich wie bei den Sirenien. Die Vorkammern sind sehr geräumig; Herzohren fehlen , statt ihrer finden sich rechts und links gewundene , stark gefurchte, solide Anhänge. Die großen Gefäße entspringen wie beim indischen Elefanten in zwei Stämmen , einem truncus anonymus für rechte Subclavia und beide Carotiden und der linken Subclavia. Während ersterer und die Aorta bis zum Abgang der Gefäße sehr kurz ist , ist die pulmonalis merkwürdig lang bis zu ihrer Theilung, was beim indischen Tapir noch auffallender ist. Es sind zwei obere Hohlvenen und eine untere vorhanden. Im Ganzen ist das Herz des africanischen Elefanten kleiner als das des indischen. — Die Milz ist platt zungenförmig, an beiden Enden verschmälert. Ihre Länge ist enorm, 1,31m, ihre größte Breite 0,28m. — In Bezug auf die Zunge sei auch nur auf das von früheren Angaben Abweichende hingewiesen. Der Wharton sehe Gang mündet auf einem 15 mm langen frei flottireuden Faden, beinahe wie beim Pferde. Papulae foliatae (Mayer'sches Organ) sind rechts 19, links 18 vorhanden (33 Forbes , 15 Mojsisovics) . Den Pharyngealsack fanden Verf. so, wie ihn Watson vom indischen Elefanten beschreibt. — Am Kehlkopf sind die oberen Stimmbänder vorhanden ; 1. Morphologie, a) Anatomie. B. Monographien einz. Abth. 9 die gegentheiligen Angaben früherer Beobachter sind wahrscheinlich darauf zurückzuführen, daß sie junge Individuen untersucht haben. — Der Magen scheint im Verhältnis größer zu sein als beim indischen Elefanten. — Die Niereu boten auf der einen Seite eine pathologische Vergrößerung , auf der anderen vielleicht eine beginnende Atrophie dar. Verf. äußern die Ansicht, daß die Lappenbildung wohl mit dem Alter verschwinde. — Die Hoden des untersuchten Thieres waren viermal größer als die von Moj sisovics gemessenen. Das veru montanum sprang stark vor, nach vorn leistenartig verlängert. Die Öffnung des Uterus war V2cni weit, der Uterus 2cm tief. Jederseits fanden sich drei Prostatagänge. Die Urethralöffnung an der Spitze des Penis war nicht Y-förmig, sondern einfach senkrecht elliptisch.
Lepidoptera phylogeny and systematics : the state of inventorying moth and butterfly diversity
(2007)
The currently recognized robust support for the monophyly of the Lepidoptera (and the superorder Amphiesmenoptera comprising Lepidoptera + Trichoptera) is outlined, and the phylogeny of the principal lineages within the order is reviewed succinctly. The state of the taxonomic inventory of Lepidoptera is discussed separately for ‘micro-moths’, ‘macro-moths’ and butterflies, three assemblages on which work has followed historically somewhat different paths. While currently there are about 160,000 described species of Lepidoptera, the total number of extant species is estimated to be around half a million. On average, just over one thousand new species of Lepidoptera have been described annually in recent years. Allowing for the new synonyms simultaneously established, the net increase in species numbers still exceeds 800/year. Most of the additions are foreseeable in the micro-moth grade, but even for butterflies ca 100 species are added annually. Examples of particularly interesting new high-rank taxa that have been described (or whose significance has become realized) since the middle of the 20th century include the non-glossatan lineages represented by Agathiphaga and Heterobathmia and the heteroneuran families Andesianidae, Palaephatidae, Hedylidae and Micronoctuidae. Some thoughts on how present and future systematic lepidopterology might be prioritised are presented.
The morphology of green and blue feathers of the Rose-faced Lovebird (Agapomis roseicollis) is described from light-, fluorescence-, and electron microscopical findings and discussed in relation to earlier works. The description is intended to provide a basis for future comparative studies. Special attention is given to the colour-producing elements (pigments and the short-wave reflecting spongy structure ('Blaustruktur', 'cloudy medium') of specialized medullary barb cells (spongy cells, box cells)), and the findings are correlated with macro- and microspectrophotometric measurements. Green barbs differ from those of blue ba rbs in having their cortex yellow pigmented, but are further distinguished by their spongy structure which is denser (wider keratin rods and correspondingly narrower air-filled channels) than that of blue barbs. This difference corresponds to the wave-length of maximum reflectance being shifted c. 30 nm towards longer wave-lengths compared to that of blue barbs. Thus green barbs are not the same as blue barbs only with a yellow pigmented instead of an unpigmented cortex, as usually stated. Dark green hack feathers reflect approximately half as much light throughout the visible spectrum as do green belly feathers. This difference is due to variations in yellow and black pigmentation of the barbules. These variations are described quantitatively and the importance of barbules for the resulting feather colour is stressed. Variation in size and shape of barbs and barbules are discussed, principally in relation to their optical efIects and the presumed functions of the colours. The colour produced by the spongy structure cannot be explained by Tyndall (Rayleigh) scattering as is usually done. This follows from the shapes of the barb reflectance spectra which are not in agreement with the Rayleigh equation (scattering inversely proportional to lambda4). A new model for colour production is forwarded. It is based on a model of the spongy structure in which this is considered to consist of short hollow keratin cylinders (diameter 0.3-0.35 ft) with air-filled cores. Backscattering from these cylinders is considered responsible for colour production and good agreement is obtained between values of lambda max calculated from the model and those measured spectrophotometrically. The backscattering from the Individual cylinders can be regarded as an Interference phenomenon. The colour of the spongy structure thus is an interference colour. That it appears diffuse and not iridescent, as is generally the case for interference colours in feathers, is due to the presence of many hollow cylinders oriented in all directions in the spongy structure.
On the occurence of bats (Chiroptera) in South Tyrol (2): Vespertilionidae Since 1988 the author has been collecting and recording bat observations in South Tyrol. From 1990 to 1991 and from 1995 to 1997, in two different studies, he carried on a survey on the presence, the frequency and the horizontal and vertical dispersal of the various species of bats. The first task was on one hand to search the attics and steeples of about 700 churches and chapels; and, on the other hand, to answer the numerous calls telling of the presence of bats in private houses, to capture bats for a check-up and to inform people about European bats beeing harmless for humans, animals and houses. There is good evidence of 23 species of bats in South Tyrol since 1988 and of the reproduction of 18 of them, as well as there are single discoveries of three further species, and finally summer colonies of two species. As there is no certified evidence of the presence of Pipistrellus pygmaeus and of Plecotus alpinus they have not been included in this record. The data-base already provides a good idea of the presence and frequency of bat-species. Species which are frequent in Central Europe have been found almost everywhere in South Tyrol (e.g. Pipistrellus pipistrellus, Plecotus sp.), some of them in several colonies with a considerable number of individuals. The Etsch/ Adige Valley as far up as Meran/Merano - due to its mild climate - makes home for a few Mediterrean species. The few possibilities we got from scientific pubblications to make a comparison with former times let suppose that the bat occurences have diminued only in a few species. The reasons are to search mainly in the diminued offer of food.
The factors responsible for determining the host-plants and feeding sites of aphids, and the various probing activities (the role of the labium, stylet insertion, surface saliva deposition, the behaviour of the aphid, virus transmission) are examined. There is a brief review of stylet structure and movement and the possible sensory nature of these organs, followed by a detailed review of the characteristics of aphid stylet paths in plant tissues. The penetration of epidermis and vascular tissues is treated separately while that within the intermediate tissues is covered in relation to leaves and stems, roots, trees, galls and excised tissue as well as in separate sections on Aphis fabae Scopoli and Myzus persicae (Sulzer). Stylet destinations and behaviour in the sieve tubes are discussed together with general features such as rate and depth of penetration, guidance to the feeding site, effects of tissue hardness and stylet withdrawal. The ingestion rate of plant sap is reviewed and its constitution and importance examined together with the significance of artificial diets. The salivary secretions including sheaths and tracks, their functions and their role in the transference of material between aphid and host are dealt with. The nature of the physical and internal damage resulting from aphid feeding is briefly covered, and also some plant-insect interrelations. The aphid species whose stylets have been examined in plant tissue are listed.