Delineating species boundaries correctly is crucial to the discovery of life’s diversity because it determines whether or not different individual organisms are members of the same entity. The gap in communication between the different disciplines currently involved in delimiting species is an important and overlooked problem in the so-called ‘taxonomy crisis’. To solve this problem, it is suggested that taxonomy become integrative, and this integration is seen as the real challenge for the future of taxonomy. ‘Integrative taxonomy’ is defined as the science that aims to delimit the units of life’s diversity from multiple and complementary perspectives (phylogeography, comparative morphology, population genetics, ecology, development, behaviour, etc.). Some workers have already collaborated and successfully adopted an integrative approach to taxonomy. However, it is now time for the whole discipline to evolve. A radical change in mentality is needed concerning the creation of names in order to achieve this integration and to prevent the over-abundance of both synonyms and names of doubtful application from worsening. Integrative taxonomy gives priority to species delineation over the creation of new species names. Furthermore, it is emphasized that describing morphological diversity, referred to as ‘morphodiversity’, does not require the naming of any single set of specimens. Seven guidelines are proposed to help integrative taxonomists recognize cases when species are supported by broad biological evidence and therefore are deserving of an official name. © 2005 The Linnean Society of London, Biological Journal of the Linnean Society , 2005, 85 , 407‐415. ADDITIONAL KEYWORDS: biodiversity ‐ character variation ‐ DNA barcoding ‐ ecology ‐ morphodiversity ‐ phylogenetics ‐ phylogeography ‐ population biology ‐ species delineation ‐ systematics.

Towards integrative taxonomy

This Science Plan and Implementation Strategy sets out the research agenda for the second phase of IGBP The document describes the IGBP strategy for producing high quality, unbiased, credible, fundamental scientific research in the area of global change: a strategy centered on ten projects, to be carried out by the several thousand scientists worldwide who are part of the IGBP network Further, the document describes how the organization will communicate the results of this research to different audiences, in order to realize its vision: "to provide scientific knowledge to improve the sustainability of the living Earth"

/pdf/science-plan-and-implementation-strategy-23459qk3dd.pdf

Science Plan and Implementation Strategy

Divergence date estimation and a comprehensive molecular tree of extant cetaceans.

Mead, J. G., and R. E. Fordyce. The Therian Skull: A Lexicon with Emphasis on the Odontocetes. Smithsonian Contributions to Zoology, number 627, 248 pages, frontispiece, 2 diagrams, 32 figures, 9 tables, 2009. — Cetaceans form one of the most unique groups in the evolutionary history of mammals. They have returned to the sea and modified their tail as an efficient means of locomotion. As they adapted to the limited visibility in the aquatic environment, the odontocetes developed a system of echolocation that resulted in extensive modifications to the skull bones. This made descriptive comparisons very difficult and early anatomists unwittingly composed new terms for anatomical structures that had already been named in other taxa. This made anatomical comparisons, based on the literature, extremely tenuous. This lexicon is an attempt to remedy that situation in that it provides headwords and definitions for all the terms that have been used in describing the mammal skull and notes the synonymous terms. The lexicon includes the human nomenclature (Nomina Anatomica), the veterinary nomenclature (Nomina Anatomica Veterinaria) and the nomenclature that is used in descriptive comparative anatomy. The lexicon covers not only extant but extinct mammalian groups and is extensively indexed. Cover: Detail from Frontispiece, illustration of a dolphin skull (cf. Delphinus sp.) presented by

The Therian Skull: A Lexicon with Emphasis on the Odontocetes

The origin of baleen in mysticete whales represents a major transition in the phylogenetic history of Cetacea. This key specialization, a keratinous sieve that enables filter-feeding, permitted exploitation of a new ecological niche and heralded the evolution of modern baleen-bearing whales, the largest animals on Earth. To date, all formally described mysticete fossils conform to two types: toothed species from Oligocene-age rocks ( approximately 24 to 34 million years old) and toothless species that presumably utilized baleen to feed (Recent to approximately 30 million years old). Here, we show that several Oligocene toothed mysticetes have nutrient foramina and associated sulci on the lateral portions of their palates, homologous structures in extant mysticetes house vessels that nourish baleen. The simultaneous occurrence of teeth and nutrient foramina implies that both teeth and baleen were present in these early mysticetes. Phylogenetic analyses of a supermatrix that includes extinct taxa and new data for 11 nuclear genes consistently resolve relationships at the base of Mysticeti. The combined data set of 27,340 characters supports a stepwise transition from a toothed ancestor, to a mosaic intermediate with both teeth and baleen, to modern baleen whales that lack an adult dentition but retain developmental and genetic evidence of their ancestral toothed heritage. Comparative sequence data for ENAM (enamelin) and AMBN (ameloblastin) indicate that enamel-specific loci are present in Mysticeti but have degraded to pseudogenes in this group. The dramatic transformation in mysticete feeding anatomy documents an apparently rare, stepwise mode of evolution in which a composite phenotype bridged the gap between primitive and derived morphologies; a combination of fossil and molecular evidence provides a multifaceted record of this macroevolutionary pattern.

Morphological and Molecular Evidence for a Stepwise Evolutionary Transition from Teeth to Baleen in Mysticete Whales

In the late 1970s eight Balaenoptera specimens of unknown identity were caught in the lower latitudinal Indo-Pacific waters by Japanese research whaling vessels1. The combination of the allozyme patterns and physical maturity of the eight specimens separated them from all acknowledged Balaenoptera species2. In September 1998 we collected a medium-sized baleen whale carcass on a coastal island in the Sea of Japan. This specimen and the previously collected eight specimens resembled Balaenoptera physalus (fin whale) in external appearance but were much smaller. Comparison of external morphology, osteology and mitochondrial DNA data grouped the nine specimens as a single species but separated them from all known baleen whale species. Therefore, here we describe a new species of Balaenoptera, which is characterized by its unique cranial morphology, its small number of baleen plates, and by its distant molecular relationships with all of its congeners. Our analyses also separated Balaenoptera brydei (Bryde's whale)3,4 and Balaenoptera edeni (Eden's whale)5 into two distinct species, raising the number of known living Balaenoptera species to eight.

A newly discovered species of living baleen whale

Balaenoptera omurai is a newly discovered baleen whale that represents an ancient evolutionary lineage

近年、ツノシマクジラBalaenoptera omurai Wada, Oishi et Yamada, 2003 が新たに記載された際 に、いわゆるニタリクジラBalaenoptera edeni Anderson, 1878/9 はカツオクジラB. edeni と狭義 のニタリクジラBalaenoptera brydei Olsen, 1913 に分けられることが指摘された。筆者らによる 台湾やタイなどの調査では、これら 3 種の中型のナガスクジラ科鯨類が多数存在することがわかっ ているが、比較できる標本が増えたことで、頭頂部の形態学的特徴に加えて、翼蝶形骨周辺の脳 頭蓋側面の形態でも 3 種が明瞭に識別できることがわかってきている。和歌山県立自然博物館と 大分県杵築市立図書館には、かつていわゆるニタリクジラB. edeni として報告されたナガスクジ ラ科鯨類標本が保管されているが、カツオクジラB. edeni のホロタイプを含む既報告の標本の頭 頂部と翼蝶形骨の形態の比較により、これらの標本はカツオクジラB. edeni であると判断される。 要 旨

Shiro Wada

Papers

A newly discovered species of living baleen whale

Balaenoptera omurai is a newly discovered baleen whale that represents an ancient evolutionary lineage

Re-examination of balaenopterid whales from Wakayama and Oita prefectures, Japan