Gross anatomy of the gluteal and posterior thigh muscles in koalas based on their innervations

There are not many descriptions of the muscle morphology of marsupials, despite the fact that they should show diversity according to the adaptation and dispersal to a variety of environments. Most of the previous studies regarding the gross anatomy of marsupials were conducted in the 1800 - 1900’s, and many issues still remain that need to be reexamined. For instance, the muscle identification had been performed based only on their attachments and thus, muscle descriptions are often inconsistent among the studies. These classic studies often do not include figures or photographs, so the discrepancies in the descriptions of the muscles could only be verified by performing the muscle identification again with a more reliable method. This problem can be solved by performing muscle identification by innervation. This method, which focuses on the ontogenic origin of the muscle as opposed to the attachment site, is prone to individual and interspecies variation and is a common technique in recent anatomical research. This technique is more reliable than previous methods and is suitable for comparison with other taxa (i.e., eutherians). In this study, we first conducted muscle identification based on innervation in the gluteal and posterior thighs of koalas in order to reorganize the anatomical knowledge of marsupials. This is because the gluteus and posterior thighs of koalas are the areas where previous studies have been particularly inconsistent. We dissected five individual koalas and clarified discrepancies in previous studies, as well as investigated the unique muscle morphology and their function in koalas. Specifically, the koala's gluteal muscle group is suitable for abduction, while the posterior thigh muscles are particularly suitable for flexion. In the future, we will update the anatomical findings of marsupials in the same way to clarify the adaptive dissipation process of marsupials, as well as to contribute to the understanding of the evolutionary morphology of mammals.

Uses for Incomplete Ammonite Sutures: Lateral Lobe and Second Saddle as Markers of Sutural Complexity

Ammonoid sutures are geometric patterns formed by the intersection of the septa and the shell wall, and have long been a diagnostic tool for ammonite researchers for such applications as species identification, taxonomic relationships, ontogenetic change, functional and evolutionary morphology, determination of ecological niche, and other aspects of ammonoid paleobiology. Researchers interested in a variety of paleobiological questions related to ammonoids have almost always required access to the entire hemisuture. Without access to specimens in museum or institutional collections, researchers must rely on previously published illustrations and photographs of ammonoid sutures. However, due to the perspective in photographs, distortion of the marginal elements of suture geometry occurs due to shell curvature near the venter and umbilicus when photographed in profile. The revised approach described here, which we refer to as the Lateral Lobe Saddle, or LLS approach, makes use of only the lateral lobe and second saddle S2 (lateral lobe-second saddle pairs, or LLS) which lie in the central, mid-whorl undistorted sector of a suture line as viewed in lateral, profile shell photos and illustrations. The factors by which fractal dimension of LLS data convert to fractal dimension of the standard hemisuture measurements are largely consistent within genera. The LLS method’s non-requirement of a full hemisuture also facilitates comparisons among sutures within an ontogenetic sequence, or sutures from multiple ammonite taxa where ventral and umbilical sutural elements are hidden by whorl overlap or poor preservation.

Lagomorpha as a Model Morphological System

Due to their global distribution, invasive history, and unique characteristics, European rabbits are recognizable almost anywhere on our planet. Although they are members of a much larger group of living and extinct mammals [Mammalia, Lagomorpha (rabbits, hares, and pikas)], the group is often characterized by several well-known genera (e.g., Oryctolagus, Sylvilagus, Lepus, and Ochotona). This representation does not capture the extraordinary diversity of behavior and form found throughout the order. Model organisms are commonly used as exemplars for biological research, but there are a limited number of model clades or lineages that have been used to study evolutionary morphology in a more explicitly comparative way. We present this review paper to show that lagomorphs are a strong system in which to study macro- and micro-scale patterns of morphological change within a clade that offers underappreciated levels of diversity. To this end, we offer a summary of the status of relevant aspects of lagomorph biology.

Evolutionary morphology of the antennal heart in stick and leaf insects (Phasmatodea) and webspinners (Embioptera) (Insecta: Eukinolabia)

The morphology of the antennal hearts in the head of Phasmatodea and Embioptera was investigated with particular reference to phylogenetically relevant key taxa. The antennal circulatory organs of all examined species have the same basic construction: they consist of antennal vessels that are connected to ampullae located in the head near the antenna base. The ampullae are pulsatile due to associated muscles, but the points of attachment differ between the species studied. All examined Phasmatodea species have a Musculus (M.) interampullaris which extends between the two ampullae plus a M. ampulloaorticus that runs from the ampullae to the anterior end of the aorta; upon contraction, all these muscles dilate the lumina of both ampullae at the same time. In Embioptera, only the australembiid Metoligotoma has an M. interampullaris. All other studied webspinners instead have a M. ampullofrontalis which extends between the ampullae and the frontal region of the head capsule; these species do not have M. ampulloaorticus. Outgroup comparison indicates that an antennal heart with a M. interampullaris is the plesiomorphic character state among Embioptera and the likely ground pattern of the taxon Eukinolabia. Antennal hearts with a M. ampullofrontalis represent a derived condition that occurs among insects only in some embiopterans. These findings help to further clarify the controversially discussed internal phylogeny of webspinners by supporting the view that Australembiidae are the sister group of the remaining Embioptera.

A Size-Independent Revision of the Fractal Step Method for Ammonite Sutures

The novel coronavirus has presented specimen-access challenges to geoscientific researchers, including paleobiologists interested in fossil ammonoids. Ammonoid sutures are geometric patterns formed by the intersection of the septa and the shell wall, and have long been a diagnostic tool for ammonite researchers for such applications as species identification, taxonomic relationships, ontogenetic change, functional and evolutionary morphology, and other aspects of ammonoid paleobiology. Without access to specimens in museum and institutional collections, researchers must rely on previously published illustrations and photographs of ammonoid sutures. However, many of these illustrations were published decades ago without an index of scale. Suture tracings lacking a scale bar are not usable by researchers interested in applying the quantitativeness of fractal geometry to the interpretation of septal complexity. Additonally, distortion of the marginal elements of suture geometry occurs due to shell curvature near the venter and umbilicus. The revised approach described here eliminates the problem of missing scale information in fractal analysis of ammonite sutures, making use of just the lateral lobe and adjacent saddle. Our revised method’s non-requirement of a full hemisuture also facilitates comparisons among sutures within an ontogenetic sequence, or sutures from multiple ammonite taxa.

The Making and Development of E. N. Mirzoyan’s Evolutionary Concept (In Commemoration of the 90 th Anniversary of His Birth)

A renowned biologist and historian of science Eduard Nikolaevich Mirzoyan would have turned 90 in April 2021. The author of over 200 publications, including 15 monographs, on the history of evolutionary morphology, evolutionary histology, evolutionary physiology and biochemistry, and evolutionary and global ecology, he was also exploring the problem of how ontogenesis and phylogenesis are related to the theoretical aspects of evolutionary biology. As a result of a long-time creative pursuit, Mirzoyan developed his own outlook on biological evolution, captured mostly in his personal archive. Analyzing the 20 th century evolutionary synthesis strategies, Mirzoyan formulated his own evolutionary concept and put forward an idea that the 21 st century evolutionists must concentrate their efforts on constructing a general theory of the living matter evolution instead of the evolutionary theories that prevailed in the 20 th century and focused on explaining the formation of species. This article is devoted to the analysis of Mizoyan’s evolutionary views.

The Main Lines of Research at the Botanical Garden of M. V. Lomonosov Moscow State University in 1937–1973

The Botanical Garden of M. V. Lomonosov Moscow State University is the oldest scientific botanical institution in Russia. Established in 1706 as a physic garden, it was acquired by Moscow University in 1805. This article reviews the dynamics of the range of research areas pursued by the Garden in 1937–1973 (from its becoming an autonomous institution within MSU to the splitting of Biological and Soil Science Faculty and the Garden becoming part of a recreated Biological Faculty). Based on the analysis of bibliography and materials of the theme plans and reports on the Garden’s research work, deposited at the MSU Archive, this time period may be divided into several stages. Thus, in 1937–1948, the research focused on the development of methods for experimental morphogenesis, designed do obtain new heritable forms (induced polyploidy, X-ray treatment of crop and ornamental plants (L. P. Breslavets-Krestovnikova); development of scientific foundation for horticulture (“green construction”) to expand the diversity of herbaceous ornamental plants (M. P. Nagibina); studies on plant development rhythms and factors (A. V. Kozhevnikov, I. G. Serebryakov). In 1948–1951, after the August VASKhNIL Session, the problems of vegetative hybridization prevailed while, in 1952–1957, the researchers’ attention was focused on the development of scientific basis for the construction of a new botanical garden as a component of natural science cluster of MSU on Leninskie (Vorobyovy) Gory (N. A. Bazilevskaya). In 1958–1964, the focus was shifted towards complex studies of the domestic flora. In 1967–1973, the garden’s main lines of research were evolutionary morphology, plant taxonomy, floristics, and botanical geography (A. K. Skvortsov, V. N. Tikhomirov); plant protection and agrochemistry; and breeding and genetics of ornamental plants and fruit and berry crops. Therefore, at different stages, the emphasis was placed on both the fundamental and applied research whose focus changed depending on the sociopolitical context of the epoch.

Vadym Topachevsky, an outstanding zoologist and manager of science (to the re-searcher’s 90th anniversary)

The life of Vadym Oleksandrovych Topachevsky and his contribution to the development of science is considered. V. O. Topachevsky was the most famous palaeomammalogist of Eastern Europe, long-term head of the palaeontological department of the now National Museum of Natural History of the National Academy of Sciences of Ukraine, director of Schmalhausen Institute of Zoology of the Ukrainian SSR, founder and editor-in-chief of a number of important Ukrainian zoological publications, and academician of the National Academy of Sciences of Ukraine. Vadym Oleksandrovych was at the origins of systematic palaeontological expeditions to key sites of the Quaternary period, participated in the development of serial collections of small mammals and of the research techniques of faunal complexes based on the analysis of samples characterising the micromammal fauna of a particular section. Research by V. O. Topachevsky is devoted to such fundamental branches of zoology as taxonomy, phylogenetics, historical faunistics, evolutionary morphology, and zoogeography. The scientist paid much attention to biostratigraphy and palaeogeography. He solved complex issues of taxonomy and parataxonomy in relation to extinct and modern representatives of fauna, justified the establishing of a number of new to science taxa of extinct mammals. Among the outstanding achievements of Vadym Topachevsky of great importance is the creation of a comprehensive association scheme of development of communities, which explains the changes in the fauna of small mammals of the late Pliocene, Eopleistocene and Pleistocene of the Northern Black Sea Region, as well as the development and justification of the biozonal stratigraphic scheme of the late Miocene and Pliocene of the Eastern Paratethys. He is the author of 8 monographs and supervisor of 11 candidate and 2 doctoral dissertations. Vadym Oleksandrovych formed a powerful scientific department and prepared a worthy scientific change, the works of which are well known to specialists. His achievements were awarded the Order of the Badge of Honor, the titles of Academician of the NAS of Ukraine, Honoured Worker of Science and Technology of Ukraine, and he won the I. I. Schmalhausen Prize of the NAS of Ukraine. The palaeontological exhibition of the National Museum of Natural History NAS of Ukraine was named after the scientist in 2005. The list of Vadym Topachevsky’s main scientific works is given as well.