@article {Nokkala2003,
	title = {The origin of the achiasmatic XY sex chromosome system in Cacopsylla peregrina (Frst.) (Psylloidea, Homoptera)},
	journal = {Genetica},
	volume = {119},
	number = {3},
	year = {2003},
	pages = {327{\textendash}332},
	abstract = {The status of an extra univalent, if it is a B chromosome or an achiasmatic Y chromosome, associating with the X chromosome in male meiosis of Cacopsylla peregrina (Frst.) (Homoptera, Psylloidea) was analysed. One extra univalent was present in all males collected from three geographically well separated populations, it was mitotically stable, and showed precise segregation from the X chromosome. These findings led us to propose that the univalent represents in fact a Y chromosome. The behaviour of the X and Y chromosomes during meiotic prophase suggested that their regular segregation was based on an achiasmatic segregation mechanism characterised by a {\textquoteright}touch and go{\textquoteright} pairing of segregating chromosomes at metaphase I. To explain the formation of the achiasmatic Y within an insect group with X0 sex chromosome system, it was suggested that the Y chromosome has evolved from a mitotically stable B chromosome that was first integrated into an achiasmatic segregation system with the X chromosome, and has later become fixed in the karyotype as a Y chromosome.},
	keywords = {Achiasmatic segregation, B chromosome, Bulgaria, homoptera, Psylloidea, Y chromosome},
	isbn = {0016-6707},
	issn = {00166707},
	doi = {10.1023/B:GENE.0000003757.27521.4d},
	author = {Nokkala, S. and Grozeva, S. and Kuznetsova, V. G. and Marya{\~n}ska-Nadachowska, A.}
}
@article {Burckhardt1989,
	title = {Systematics and biology of the Rhinocolinae (Homoptera: Psylloidea)},
	journal = {Journal of Natural History},
	volume = {23},
	number = {3},
	year = {1989},
	month = {jun},
	pages = {643{\textendash}712},
	publisher = {Taylor \& Francis Group},
	abstract = {Based on a cladistic analysis, the subfamily Rhinocolinae is redefined to comprise 13 genera and 39 species, of which two genera and eight species remain unnamed. Four new genera and 14 new species are described; one subfamily and one genus are synonymized, and two species are recombined; one lectotype is designated. The subfamily is divided into two groups, one with a Gondwanan distribution comprising four genera in Australia, New Zealand, South America and Africa, and another with Laurasian distribution in the Palaeotropics, the Western Palaerctic and North America comprising nine genera. Twenty-one species develop on host plants in the Rutales, three on Asteraceae, three on Cistaceae and one on Zygophyllaceae. The genus Pistacia (Anacardiaceae) in particular hosts six species whose biology is discussed.},
	keywords = {biogeography, Biology, Bulgaria, homoptera, host plants, Pistacia, Psylloidea, Rhinocolinae, Rutales, taxonomy},
	issn = {0022-2933},
	doi = {10.1080/00222938900770371},
	url = {http://www.tandfonline.com/doi/abs/10.1080/00222938900770371\#.V_P-tbQ0p90.mendeley},
	author = {Burckhardt, D. and Lauterer, P.}
}
