. Bonner zoologische Beiträge : Herausgeber: Zoologisches Forschungsinstitut und Museum Alexander Koenig, Bonn. Biology; Zoology. 256 Käthe R. Jensen: Biogeography of Sacoglossa onymizations, with a few controversial exceptions, will not be discussed. Only synonymies that have been pub- lished and not subsequently contested are used. Thus species that have only been mentioned once in the liter- ature are, with few exceptions mentioned in the text, con- sidered valid. ofinclusion= IOO(a/Nmin) (Golikov 1989). These indices differ in the weight placed on shared species (a) compared to total numbe
. Bonner zoologische Beiträge : Herausgeber: Zoologisches Forschungsinstitut und Museum Alexander Koenig, Bonn. Biology; Zoology. 256 Käthe R. Jensen: Biogeography of Sacoglossa onymizations, with a few controversial exceptions, will not be discussed. Only synonymies that have been pub- lished and not subsequently contested are used. Thus species that have only been mentioned once in the liter- ature are, with few exceptions mentioned in the text, con- sidered valid. ofinclusion= IOO(a/Nmin) (Golikov 1989). These indices differ in the weight placed on shared species (a) compared to total number of species in the compared regions (Nl. N2), and species found exclusively in one or the other of the compared regions (b, c). Biogeographic regions and provinces were taken from BrKjGS (1995) (Fig. I), and sacoglossan distributions among these provinces were recorded. Although it must be assumed that a species occurs continuously between the extreme points of distribution, species were only scored as occurring in a region or province if at least one published record existed. The number of endemic species was determined for each province. As some regions were clearly underrepresented with regards to faunistic studies on opisthobranchs, a few regions have been merged or deleted from the analyses. Similarity between biogeo- graphic regions or provinces was analyzed using three in- dices: CJ= Jaccard's coefficient= IOO(a/(NI+N2-a)) (Valentine 1966), SD= Dice coefficient 100(2a/(2a+b+c)) (Lfal & Bouchet 1991), and l=index 3. RESULTS Fossil history After the description of live specimens of bivalved sacoglossan gastropods (Kawaguti & Baba 1959), sev- eral papers on fossil species of these sacoglossans ap- peared. The first reviews of fossil sacoglossans were those of BoETTGER (1963) and Kay (1968). There have been ex- tensive discussions about the identity of the Recent Tamauovcilva, Edenttellina and Midorigai and the Mid- dle Eocene genus Bertheliiiia ( Edmunds
Size: 1914px × 1305px
Photo credit: © Library Book Collection / Alamy / Afripics
License: Licensed
Model Released: No
Keywords: ., bookcentury1900, bookcoll, booksubjectbiology, booksubjectzoology
