Comparative morphology
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Mandibles of representatives of the Holarctic crayfish families Astacidae, Cambaridae, and Cambaroididae were examined using SEM, and the results were analyzed in a phylogenetic framework. The intraspecific variability of the incisor process was found to be higher than its interspecific variability, mainly due to extensive abrasion of its ridge during intermolt periods. The plesiomorphic state of the crayfish mandibles highlights the dentate-crenate type of the incisor process and the extensive ribbed molar field with a multicuspidate caudal part, typical of the two parastacid crayfish examined for comparison. For Holarctic crayfish, the initial evolutionary type of the incisor is also the dentate-crenate one, but the molar field has a bowl-shaped caudal part and reduced cephalic part, both of which have been shown, for example, for Cambaroides. Similar mandibles are also widely present in American cambarids, which further evolved a blade-like incisor process (some Faxonius spp.) or a tricuspidate or double-bladed caudal molar field (some Procambarus spp.). The molar field in Astacidae crayfish is subdivided and rugose. The results of the present study indicate that little phylogenetic information is conveyed by the mandible shape at the species or genus level. Evolutionary changes are indicated mainly on the level of the main crayfish families. RESEARCH HIGHLIGHTS: Mandible shape can be an additional characteristic to distinguish crayfish families and selected genera. Obvious differences exist in the molar process rather than in the incisor ridge.
- MeSH
- anatomie srovnávací * MeSH
- biologická evoluce * MeSH
- druhová specificita MeSH
- fylogeneze MeSH
- mandibula anatomie a histologie diagnostické zobrazování MeSH
- řezáky diagnostické zobrazování MeSH
- severní raci anatomie a histologie MeSH
- shazování tělního pokryvu MeSH
- zvířata MeSH
- Check Tag
- zvířata MeSH
- Publikační typ
- časopisecké články MeSH
- práce podpořená grantem MeSH
- srovnávací studie MeSH
... Fredrickson -- Comparative Aspects of Hematopoietic Neoplasms of Rodents -- Thelma B. ... ... Snell -- Morphology of Cavian Leukemia -- Stanley R. ... ... Fraumeni, Jr 221 -- PART II -- Topics in Comparative Oncology and Comparative Hematopathology -- Non-neoplastic ... ... Dunn 285 -- Comparative Aspects of the Mastocytoses -- Carolyn H. ... ... Lingeman 289 -- Burkitts Lymphoma—A Comparative Study -- Robert A. ...
National Cancer Institute monograph ; no. 32
365 s. : il.
- Konspekt
- Patologie. Klinická medicína
- NLK Obory
- patologie
- hematologie a transfuzní lékařství
- onkologie
- MeSH
- BCG vakcína farmakologie MeSH
- Publikační typ
- srovnávací studie MeSH
- Geografické názvy
- Československo MeSH
- Dánsko MeSH
21, 426 s. : il.
- MeSH
- anatomie srovnávací MeSH
- cévy anatomie a histologie růst a vývoj MeSH
- embryologie MeSH
- finanční podpora výzkumu jako téma MeSH
- savci MeSH
- zvířata MeSH
- Check Tag
- zvířata MeSH
- Publikační typ
- přehledy MeSH
