The phylogenetic position of two putative new species of the collembolan genus Orchesella was investigated by comparison with four other Italian species of the genus using a fragment of the mitochondrial gene encoding for subunit I of cytochrome c oxidase (COI). The gene showed the well-known A + T bias, typical of insect mitochondrial DNA, although A + T content was not as high as that observed in species belonging to more derived insect orders. The large number of variable sites in 3rd codon positions (85.2% variable) suggested that these sites contain significant homoplasy due to multiple hits. Despite the lack of morphological differentiation, the COI portion examined shows remarkable levels of genetic divergence between the putative species and their closest relatives. Phylogenetic analysis suggests that one of the putative new species is related to O. villosa, whereas the other is included in a clade with O. cincta and O. ranzii. The species O. chiantica appears to be related to O. villosa, agreeing with previous allozyme data

Frati, F., Dell'Ampio, E., Casasanta, S., Carapelli, A., Fanciulli, P.P. (2000). Large amounts of genetic divergence among Italian species of the genus Orchesella (Insecta, Collembola) and the relationships of two new species. MOLECULAR PHYLOGENETICS AND EVOLUTION, 17(3), 456-461 [10.1006/mpev.2000.0854].

Large amounts of genetic divergence among Italian species of the genus Orchesella (Insecta, Collembola) and the relationships of two new species

FRATI F.;CARAPELLI A.;FANCIULLI P. P.
2000-01-01

Abstract

The phylogenetic position of two putative new species of the collembolan genus Orchesella was investigated by comparison with four other Italian species of the genus using a fragment of the mitochondrial gene encoding for subunit I of cytochrome c oxidase (COI). The gene showed the well-known A + T bias, typical of insect mitochondrial DNA, although A + T content was not as high as that observed in species belonging to more derived insect orders. The large number of variable sites in 3rd codon positions (85.2% variable) suggested that these sites contain significant homoplasy due to multiple hits. Despite the lack of morphological differentiation, the COI portion examined shows remarkable levels of genetic divergence between the putative species and their closest relatives. Phylogenetic analysis suggests that one of the putative new species is related to O. villosa, whereas the other is included in a clade with O. cincta and O. ranzii. The species O. chiantica appears to be related to O. villosa, agreeing with previous allozyme data
2000
Frati, F., Dell'Ampio, E., Casasanta, S., Carapelli, A., Fanciulli, P.P. (2000). Large amounts of genetic divergence among Italian species of the genus Orchesella (Insecta, Collembola) and the relationships of two new species. MOLECULAR PHYLOGENETICS AND EVOLUTION, 17(3), 456-461 [10.1006/mpev.2000.0854].
File in questo prodotto:
File Dimensione Formato  
frati mpe 2000.pdf

non disponibili

Tipologia: Post-print
Licenza: NON PUBBLICO - Accesso privato/ristretto
Dimensione 74.98 kB
Formato Adobe PDF
74.98 kB Adobe PDF   Visualizza/Apri   Richiedi una copia

I documenti in IRIS sono protetti da copyright e tutti i diritti sono riservati, salvo diversa indicazione.

Utilizza questo identificativo per citare o creare un link a questo documento: https://hdl.handle.net/11365/31936
 Attenzione

Attenzione! I dati visualizzati non sono stati sottoposti a validazione da parte dell'ateneo