Gynacantha rosenbergi KAUP

Theischinger, G., 2007, The final instar larvae of Gynacantha rosenbergi KAUP and Antipodogomphus proselythus (MARTIN) (Odonata, Aeshnidae & Gomphidae), Linzer biologische Beiträge 39 (2), pp. 1233-1237 : 1233-1234

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Gynacantha rosenbergi KAUP


Gynacantha rosenbergi KAUP ( Figs 1, 2)

FRASER (1963) pointed out that the larva TILLYARD (1916) had described as G.

rosenbergi belonged to G. dobsoni FRASER , a statement agreed to by THEISCHINGER

(2002). The following, therefore, is the first description of the larva of G. rosenbergi .

M a t e r i a l: 1 final instar male exuvia and 1 final instar female exuvia from larvae collected in a pond nr Deep Forest Lodge, Cape Tribulation, Queensland, Australia, 28.12.2006, S. Butler / adults emerged in Sydney, Grays Point, 28./ 29.3.2007, G. & C. Theischinger.

Total length 38.5-39.0 mm; width of head including eyes 8.0 mm; length of metafemur 5.9-6.2 mm; length of abdomen 26.8-27.2 mm. Prementum: length 6.1-6.2 mm; width at distal end 4.4-4.5 mm, at base 1.7-1.8 mm.

D i a g n o s i s Prementum moderately slender, slightly petiolate, length/width ratio 1.38-1.40; ligula margins curved, a tiny tooth each side of, and very close to, median cleft. Labial palps with row of 6-7 long palpal setae and 2-3 short palpal setae; a few additional short setae irregularly spaced next to the short setae at the basis of the row.


Approximately right angle between angular prothoracic processes, the anterior process slightly forward directed and somewhat narrower than the posterior; notal lobes small, angulated. Distinct lateral spines on abdominal segments 6-9, a tiny indication of a spine on 5. Epiproct almost as long as paraprocts. Male cerci more than 95 %, basal projection less than 40 % length of epiproct. Female gonapophyses reaching to 2/3 length of segment 10; female cerci about 90 % length of paraprocts.

R e m a r k s: Apparently G. rosenbergi is the sister species of G. dobsoni FRASER. Accordingly the larva of G. rosenbergi is very similar to G. dobsoni . Even though the prementum of G. rosenbergi was found stouter (length/width ratio 1.38-1.40) and the number of long palpal setae was found greater (6-7) than is known of G. dobsoni (length/width ratio of prementum>1.50; 5 long palpal setae) it appears that more material is needed to establish if these differences are consistent.