Heteragrion calendulum Williamson, 1919

Bota-Sierra, Cornelio Andrés & Novelo-Gutiérrez, Rodolfo, 2017, The genus Heteragrion (Odonata: Zygoptera) in Northwestern Colombia, with the description of Heteragrion tatama sp. nov., Zootaxa 4347 (3), pp. 553-571: 559-562

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Heteragrion calendulum Williamson, 1919


Heteragrion calendulum Williamson, 1919 

Heteragrion atrolineatum Donnelly, 1992  . (Holotype ♂, Allotype ♀ in USNM). Syn. nov.

Material Examined. COLOMBIA: 1♂ Holotype, Department of Antioquia, Municipality of Puerto Berrio, La Cristalina Township , 17 February 1917, J.H. and E.B. Williamson  . 1♂ and 1♀: Department Risaralda, Municipality of Pueblo Rico, Santa Cecilia Township, Alto Amurrupá Reserve , Ranas de Cristal stream, 5.32033°N 76.17357°W 620m a.s.l., 15 February 2017, J. Sandoval and C. Bota legGoogleMaps  . 6♂♂ and 2 ♀♀: PANAMA, Darién, Perresénico River, Estación Rancho Frío , 8.01982°N 77.73257°W 80m a.s.l., 17 November 2014, D. Delgado, A. Ramírez and R. Novelo leg.GoogleMaps 

Remarks. This species was described based on a single male collected at La Cristalina stream (Puerto Berrio- Antioquia) on February 17 of 1917, by Jesse Williamson and Edward B. Williamson, who were impressed by its beauty and rarity and tried, unsuccessfully, to catch some more specimens ( Williamson 1919). Exactly one century after this first collection, a second collection was made on February 15 of 2017 at the Ranas de Cristal stream (Santa Cecilia-Risaralda) by Juliana Sandoval and Cornelio Bota-Sierra who, as the Williamsons tried in vain to get more specimens, luckily caught a pair in tandem. The male specimen matched Williamson’s description exactly ( Figs 3i, kView FIGURE 3; 4b; 6a, i –j). Examination of female genital valves showed several rows of denticles ( Fig. 9dView FIGURE 9) which places it in Lencioni ´s group A. Williamson (1919) classified this species within the group B based on the small elongated finger-like paraprocts of male ( Fig. 6jView FIGURE 6), which make this species an intermediate between groups A and B. Further analysis will be needed to determine the monophyly of these groups and where to place H. calendulum  .

Specimens deposited in IEXA, collected in Panama and formerly identified as H. atrolineatum  using Donnelly ´s (1992) taxonomic key and diagnosis, were reexamined and compared to Williamson ´s description of H. calendulum  , as well as to the Colombian specimens. Also, Dr. Garrison compared the paratypes of H. atrolineatum  in his collection to our pictures and description of the new Colombian specimens. After a thorough examination of these specimens, we conclude that H. atrolineatum  is a junior synonym of H. calendulum  ( Figs 3i –kView FIGURE 3; 4 b –c, h –i; 5b; 6a –b, i –j; 8d). Donnelly (1992) followed Williamson’s (1919) criteria grouping H. atrolineatum  with H. chrysops  , H. alienum  and H. tricellulare  because of their pale coloration on dorsum of abdominal segments. Donnelly (1992) recognized a variation in color pattern with the Panamanian males having slightly darker color than Costa Rican males. Mark O ´Brien, collection manager of the University of Michigan, Museum of Zoology, photographed the holotype of H. calendulum  and Dr. Garrison photographed a Costa Rican paratype of H. atrolineatum  , based on this evidence we concluded that the only difference between these specimens is the darker coloration pattern on the holotype of H. calendulum  , which probably led Donnelly to confuse them using Williamson ´s key. Therefore, we consider that H. atrolineatum  is a junior subjective synonym of H. calendulum  .

Bota-Sierra et al. (2016) erroneously recorded a second locality for H. calendulum in Amalfí-Antioquia. They  were led astray by the similar coloration pattern of the face of H. aequatoriale  with that of H. calendulum  ( Fig. 3g, iView FIGURE 3). After the rediscovery of H. calendulum  and the comparison with diverse populations of H. aequatoriale  , it becomes clear that the Amalfí population is a morph of H. aequatoriale  , with a variation in face coloration close to H. calendulum  .














Heteragrion calendulum Williamson, 1919

Bota-Sierra, Cornelio Andrés & Novelo-Gutiérrez, Rodolfo 2017

Heteragrion atrolineatum

Donnelly 1992