Riethia, Kieffer, 1917

Cranston, Peter S., 2019, Riethia (Kieffer 1917) (Diptera: Chironomidae) revised for the Austro-Pacific region, Zootaxa 4646 (3), pp. 461-500: 495

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Riethia   larva ‘B’

( Fig. 5H View FIGURE 5 )

Material examined, larval head capsules only, AUSTRALIA, 2L., Queensland, nr Mareeba, Davies Ck., 17°01'S 145°35'E, 3.ix.2005 ( MV FNQ 7_6 (3i), MV FNQ7_8 (4i); 2L, Cloudy Ck., 18°59.50'S 146°12.30'E (Krosch) ( MV FNQCCR 3, 2).

New South Wales, 2L (1 3i, 1 4i, Clyde R., Brooman, 16.ii.2009; 2L, Currowan S.F., Cabbage Tree Ck., 35°34'S 150°02'E, 3.i.2009 ( MV AU09 CTCR14, 15). GoogleMaps  

Four larvae form a clade based on molecular data, supported by ordinations of mensural data versus CO1 genetic data (N. Herold unpubl. obs.). Morphologically these resemble larvae of R. cinctipes   in the characteristically thinned cuticle on one side of antennal segment 3, beside, and perhaps associated with, the Lauterborn organs ( Fig. 5H View FIGURE 5 ). The major distinction is in antennal segment 4 being subequal to slightly shorter than the 2 nd (80–100%), whereas in cinctipes   it is significantly and consistently shorter than the 2 nd (by c. 60%) ( Table 2 View TABLE 2 ).

Larva type B is unreared, and cannot be associated due to sympatry with others.

Both molecular vouchers from Davies Ck. ( FNQ 7–6, FNQ7–8) are from Cranston et al. (2011) for Riethia   species 3 and 4, separated morphologically due to earlier failure to recognize presence of 3 rd and 4 th instars of the same species.


University of Montana Museum