Jassa cadetta sp. n. (Amphipoda: Ischyroceridae) is described from the Venice Lagoon, northern Adriatic Sea, and a key to Mediterranean members of the genus Jassa Leach is provided. The new species is separated from J. marmorata Holmes primarily by cytogenetics, differing in chromosome number (2n=10 in J. cadetta vs. 2n=12 in J. marmorata), karyotype morphology (FN=20 vs. FN=22), and chromosome location of 18S-5.8S-28S ribosomal cistrons. Cytogenetic analysis of Ischyrocerus anguipes Krøyer (2n=10, FN=18) gives a first insight into karyological diversity among Ischyroceridae. Analysis of random amplified polymorphic DNA markers confirms the distinction between J. cadetta sp. n. and J. marmorata.
A cytogenetical study of Ischyroceridae (Amphipoda) allows the identification of a new species, Jassa cadetta sp. n., in the Lagoon of Venice
Libertini A
2008
Abstract
Jassa cadetta sp. n. (Amphipoda: Ischyroceridae) is described from the Venice Lagoon, northern Adriatic Sea, and a key to Mediterranean members of the genus Jassa Leach is provided. The new species is separated from J. marmorata Holmes primarily by cytogenetics, differing in chromosome number (2n=10 in J. cadetta vs. 2n=12 in J. marmorata), karyotype morphology (FN=20 vs. FN=22), and chromosome location of 18S-5.8S-28S ribosomal cistrons. Cytogenetic analysis of Ischyrocerus anguipes Krøyer (2n=10, FN=18) gives a first insight into karyological diversity among Ischyroceridae. Analysis of random amplified polymorphic DNA markers confirms the distinction between J. cadetta sp. n. and J. marmorata.I documenti in IRIS sono protetti da copyright e tutti i diritti sono riservati, salvo diversa indicazione.
