On tû-tû

The goal in this short paper is to argue that so-called intermediary concepts play an essential role in organizing and generating legal knowledge. The point of departure is a reconstruction and a critique of Alf Ross’s analysis of such concepts. His goal was to argue that there exist concepts in the law which have no semantic reference, yet it is reasonable to use them as they perform some useful function regarding the presentation of legal rules. The author believes that Ross is wrong on both counts: his argument to the effect that intermediary concepts have no reference is flawed, and his characterization of the functions such concepts play in the law is too limiting

Comparative analysis and systematic mapping of the labial sensilla in the nepomorpha (Heteroptera: Insecta)

The present study provides new data concerning the morphology and distribution of the labial sensilla of 55 species of 12 nepomorphan families (Heteroptera: Nepomorpha) using the scanning electron microscope. On the labial tip, three morphologically distinct types of chemosensilla have been identified: two types of papillae sensilla and one type of peg-in-pit sensilla. Twenty-one morphologically distinct types of the mechanosensilla as well as two types of the trichoid sensilla (contact-chemoreceptive sensillum) have been identified on all labial segments in representatives of subfamilies. In Nepomorpha, morphological ground plan of the labial sensory structures is represented by an apical sensory field with 10-13 pairs of papillae sensilla and the peg-in-pit ones placed more laterally; numerous trichoid sensilla are placed on the IV segment; the chaetica sensilla are present and placed in groups or rows distributed along the labium near the labial groove on the dorsal side, and also several chaetica sensilla are unevenly scattered on the surface of that segment; the cupola and peg sensilla are numerous and evenly scattered on the fourth labial segment; the prioprerecptive sensilla, one pair is positioned on the dorsal side and on the fourth segment of the labium. The new apomorphical characters have been established for the labial sensilla in the Nepomorpha

Sobre tû-tû

El propósito en este breve artículo es argumentar que los llamados conceptos intermediarios juegan un rol esencial en la organización y generación del conocimiento jurídico. El punto de partida es una reconstrucción y crítica del análisis de Alf Ross sobre dichos conceptos. Su objetivo era argumentar que existen conceptos en el derecho que no tienen referencia semántica, pero que aun así es razonable usarlos dado que cumplen con algunas funciones útiles relacionadas con la presentación de las reglas jurídicas. El autor de este artículo afirma que Ross está equivocado en ambos casos: su argumento al efecto de que los conceptos intermediarios no tienen referencia es defectuoso, y su caracterización de las funciones que dichos conceptos cumplen en el derecho es muy limitante.The goal of this short paper is to argue that so-called intermediary concepts play an essential role in organizing and generating legal knowledge. The point of departure is a reconstruction and a critique of Alf Ross’s analysis of such concepts. His goal was to argue that there exist concepts in the law which have no semantic reference, yet it is reasonable to use them as they perform some useful function regarding the presentation of legal rules. The author believes that Ross is wrong on both counts: his argument to the effect that intermediary concepts have no reference is flawed, and his characterization of the functions such concepts play in the law is too limiting

Deliberations on the external morphology and modification of the labial segments in the nepomorpha (heteroptera: Insecta) with notes on the phylogenetic characteristics

The present study provides new data concerning the external morphology of the labial segments of 46 species from nine Nepomorpha families using the scanning electron microscope. The labial segments are described in detail and images of their structures are presented for the systematic groups. Subsequent segments of the labium (I, II, III, and IV) are shaped similarly in all investigated taxa but carry individual characters in some (sub-)families. Five morphologically distinct forms of the apical plate and five intercalary sclerites have been identified. Additionally, three types of the articulation on the dorsal side between the third and second segments are interpreted as the new characters. The presence of the midventral condyle on the distal edge of the first segment and the third segment has been reanalyzed. New position of the midventral condyle on the proximal edge of the fourth labial segment has been distinguished in several groups. The new set of characters has been estimated from the plesiomorphic taxa of the Nepoidea (Nepidae and Belostomatidae) and subsequently through the more advanced taxa in the relation to the outgroup (Gerromorpha). The evaluation of these characters has revealed twenty-seven new apomorphies for the labium in the Nepomorph

The phylogenetic information carried by a new set of morphological characters in planthoppers : the internal mouthpart structures and test in the Cixiidae model (Hemiptera: Fulgoromorpha)

Internal morphological structures of Cixiidae mouthparts are described and compared in various representatives of the Cixiidae and several other representatives of hemipterans. The morphological study shows that the mouthpart structures have not evolved uniformly and reveals the great disparity of these structures. Particularly, the connecting system of the mouthparts, localisation of salivary canal and shape of the mandibular and maxillar stylets provide together a new set of 17 new characters. A parsimonious analysis to evaluate the phylogenetic interest carried by these 17 selected characters shows that mouthpart structures have not evolved anarchically, but that they indeed carry some phylogenetic information that will be useful to be included in further morphological phylogenetic analysis