Muzón, Javier, Pessacq, Pablo & Lozano, Federico, 2014, The Odonata (Insecta) of Patagonia: A synopsis of their current status with illustrated keys for their identification, Zootaxa 3784 (4), pp. 346-388: 381-385

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Austropetaliidae  ( Figs. 55View FIGURE 55, 56View FIGURE 56 a)

This small family of four genera and 10 species ( Garrison et al. 2006) is represented also in Australia and Tasmania. In Patagonia it is represented by the genera Hypopetalia  (monotypic: H. pestilens  ) and Phyllopetalia  , with five species: P. apicalis  , P. apollo  , P. excrescens  , P. pudu  and P. stictica  . All the species are present in southern Chile, but only H. pestilens  , P. apollo  and P. pudu  have also been recorded in southwestern Argentina (von Ellenrieder 2005; Pessacq & Brand 2009).

Phyllopetalia altarensis  has been recorded from central Chile (von Ellenrieder 2005), and it is included here since its known distribution area is close to the northern limit of Patagonia.

The genus Phyllopetalia  was revised by von Ellenrieder (2005), who synonymized four genera, four species, and one subspecies, provided keys for adults (herein reproduced) and distributional and taxonomic information. The larval knowledge of the family is still poor, with only the larvae of H. pestilens  and P. apollo  known ( Schmidt 1941; Pessacq & Brand 2009) with certainty. The larva of P. stictica  was described by supposition ( Schmidt 1941), and some characters of P. pudu  were provided by Pessacq & Brand (2009), also associated by supposition.

Austropetalids mainly inhabit shaded forests with small streams and rivulets. Carle (1996) mentions a semiterrestrial habitat for Phyllopetalia, Baird (2013)  observed a larva that he tentatively identified as a Phyllopetalia  sp. under a log next to a water-filled micro-depression, and Pessacq & Brand (2009 and pers. obs.) found larvae of Hypopetalia pestilens  , Phyllopetalia apollo  and Phyllopetalia  sp. in small streams (1–2 m wide) within Nothofagus  forest and on non-native Douglas-fir ( Pseudotsuga menziesii  ) plantations. Larvae were found in crevices of small falls, clinging under logs or between pebbles and debris. The characteristic lateral lobes of the abdominal segments having a serrated aspect possibly mimicks Nothofagus  leaves. Exuviae of Phyllopetalia apollo  have been found at the top of a pine tree ( Pinus contorta  ) cut at a height of about 2 m ( Pessacq & Brand 2009).

Females of Phyllopetalia apollo  have been seen flying close to the water's surface and ovipositing in the moist surface of logs protruding from water; adults of Hypopetalia pestilens  have been seen flying close to the water's surface, but also at tree-top level, at heights of more than 10 m (Pessacq pers. obs.). On several occasions males and females have been captured with malaise traps placed across small shaded streams ( Muzón & Spinelli 1995).

Neopetaliidae  ( Fig. 52View FIGURE 52 b)

This monotypic family was established by Carle & Louton (1994) for Neopetalia punctata  . This remarkable species has a restricted distribution from 33 º S in central Chile to 43 º S, being recorded in the Nothofagus  forest of Argentina approximately between 40 º S and 43 º S and from sea level to 1,700 m.a.s.l. ( Carle & Louton 1994; Muzón 1997 a).

Larvae are shallow burrowers and were found in small muddy streams and seepages ( Carle & Louton 1994); in Argentina this species has been found in small shaded streams with riparian bamboo patches within Nothofagus  forests. Adult behavior has been described by Carle & Louton (1994).

Libellulidae  ( Figs. 56View FIGURE 56 b, 57)

This cosmopolitan family is represented in Patagonia by seven species in three genera: Dasythemis mincki  , Erythrodiplax atroterminata  , E. connata  , E. corallina  , E. nigricans  , E. ochracea  , and Sympetrum villosum  .

The biogeographical aspects of these species differ considerably. For example, D. mincki  is recorded in Patagonia only from the Valcheta stream headings in Somuncura volcanic plateau, where it is locally abundant. The presence of this neotropical species in northern Patagonia, disjunct some 1,000 km southeast of the nearest population (Uspallata river, Mendoza province), could be explained by the thermal nature of the stream headings on this plateau ( Muzón 1997 a; Spinelli & Muzón 2000; Muzón et al. 2005). On the other hand, the cosmopolitan genus Sympetrum  is represented only by the endemic S. villosum  , which is a common inhabitant of ponds of the Nothofagus  forest area between 41 ° S and 46 ° S (Muzón & von Ellenrieder 1997). Finally, the species of the neotropical genus Erythodiplax present in Patagonia have large distribution areas within Argentina, except for E. connata  , a true Patagonian species, which extends slightly north to the southern portion of Mendoza province (del Palacio & Muzón 2012); all the species of Erythrodiplax  are represented in Patagonia by their southernmost populations.

Most of the non-strict Patagonian Erythrodiplax  are inhabitants of ponds and marshes, being rare in the northern steppe area (north to 42 º S), except for E. corallina  which is recorded both in the forest area of Chile and in the steppe areas of Argentina. Erythrodiplax connata  is a common and locally abundant species north to 44 º S.

In the northern steppe, only three libellulids have been recorded in sympatry: Dasythemis mincki  , Erythrodiplax atroterminata  , and E. connata  ( Muzón et al. 2005; Muzón et al. 2010). There are two other libellulids recorded in the steppe, Erythrodiplax corallina  and E. nigricans  , but only from isolated records; however, it is likely that all five will be found in sympatry.

All the larvae of Patagonian libellulids have been described ( Carvalho et al. 1991; von Ellenrieder & Muzón 2000; von Ellenrieder 2007; Garré et al. 2008; Lozano et al. 2011). Those of Sympetrum  and Dasythemis  are easily recognized by labial palp features. Larvae of Erythrodiplax  are harder to identify at the specific level, except for that of E. connata  , the only one without lateral abdominal spines.

Corduliidae  ( Fig. 58View FIGURE 58)

Dijkstra et al. (2013) proposed a restricted Corduliidae  , excluding the genus Gomphomacromia  which is left as incertae sedis within Libelluloidea. For practical purposes we include this genus in Corduliidae  . Corduliidae  is a cosmopolitan family represented by only two genera and three species in Patagonia: Gomphomacromia chilensis  , G. paradoxa  , and Rialla villosa  . The genus Rialla  is monotypic and endemic.

The genus Gomphomacromia  was revised by von Ellenrieder & Garrison (2005), who synonymized G. mexicana Needham, 1933  , with G. chilensis  , and G. etcheverry Fraser, 1957  , with G. paradoxa  . Gomphomacromia chilensis  is a poorly known species endemic to central Chile, reaching Patagonia at its northern border, approximately 35 º S; locality data are few. Gomphomacromia paradoxa  occurs all along the Andean range approximately from 32 º to 51 º S.

The larvae of Gomphomacromia paradoxa  and Rialla villosa  have been described ( Needham & Bullock 1943; Theischinger & Watson 1984); that of G. chilensis  remains unknown.

Gomphomacromia paradoxa  inhabits mountain streams, seepages and bogs, and it can be found in large numbers; males defend their territory and tandems land by the side of the streams (von Ellenrieder & Garrison 2005). Larvae of this species seem to be semi-terrestrial (von Ellenrieder & Garrison 2005).

Rialla villosa  inhabits lakes and ponds in the Nothofagus  forest. Adults fly straight close to the water; copulation takes place during flight; tandems perch on trees ( Jurzitza 1975), adults perch occasionally on grass and bushes, usually in vertical position ( Jurzitza 1989 a). Larvae were collected in oligotrophic lakes with the aid of dredges from 20 m depth (Muzón 1995).