Naslov
Systematics of Oikopleurinae (Tunicata, Appendicularia, Oikopleuridae) based on morphological and 18S rDNA data
(Ystematics of Oikopleurinae (Tunicata, Appendicularia, Oikopleuridae) based on morphological and 18S rDNA data)

Autori
Garić, Rade ; Pfannkuchen, Martin ; Batistić, Mirna

Vrsta, podvrsta i kategorija rada
Sažeci sa skupova, sažetak, znanstveni

Izvornik
46th European Marine Biology Symposium – Book of Abstracts / Travizi, Ana ; Iveša, Ljiljana ; Fafanđel, Maja - Rovinj, 2011, 78-78

Skup
46th European Marine Biology Symposium

Mjesto i datum
Rovinj, Hrvatska, 12.09.2011. - 16.09.2011

Vrsta sudjelovanja
Poster

Vrsta recenzije
Nije recenziran

Ključne riječi
Appendicularia; systematics; 18S

Sažetak
Appendicularian systematics has been solely based on a limited number of morphological characters. This, in addition to the presence of many unique characters, makes it very hard to find their appropriate position among tunicates, although a neotenic body plan suggests a basal position. The major morphological characters used in systematics of the subfamily Oikopleurinae (Lohmann, 1896) are: presence/absence of the lower lip, structure and shape of the digestive tract, presence/absence of buccal glands, number, shape and position of subchordal or amphichordal cells, shape of the tail, and width of the tail musculature. Among these, the presence/absence of the lower lip and structure and shape of the digestive tract was given priority in delimiting genera. Here we compared morphological and genetic data based on 18S rDNA sequences of five genera belonging to the subfamily Oikopleurinae: Oikopleura, Mesoikopleura, Folia, Stegosoma, and Megalocercus. Our findings suggest that based on rDNA data genera within the subfamily Oikopleurinae are not monophyletic, with the possible exception of the genus Mesoikopleura for which we only sampled one species, Mesoikopleura haranti. Furthermore, all species could be divided into three major groups: species with buccal glands and subchordal cells, species without buccal glands and subchordal cells, and a third group solely represented by M. haranti, a species without buccal glands and subchordal cells but with amphichordal cells. In addition, 18S rDNA data reveal the existence of multiple cryptic species within the genus Oikopleura.

Izvorni jezik
Engleski

Znanstvena područja
Biologija

POVEZANOST RADA