Progomphus lepidus Ris 1911
Creators: name: Molineri, Carlos
name: Rodríguez, José Sebastián
name: Leiva, Marta
name: Márquez, Javier Andrés
Publisher: name: Zenodo
Year: 2023
Subjects: Biodiversity
Taxonomy
Animalia
Arthropoda
Insecta
Odonata
Gomphidae
Progomphus
Progomphus lepidus

description: Progomphus lepidus Ris, 1911 (Figs. 10–11)
Reared material. ARGENTINA:1 last instar larva (pharate female, not emerged) from Misiones, arroyo Uruzú, 25.85805° S, 54.16945° W, 322 m, 7/Dec/1999, C. Molineri leg.
Measurements (in mm, n=1): Total length excluding caudal appendages, 19.0; abdomen without caudal appendages (ventral), 10.5; maximum width of head, 4.1; hind femur (lateral), 2.7; lateral spine on S8 (ventral, on inner margin), 0.25; epiprocts (dorsal), 1.0; paraprocts (dorsal) 1.0; cerci (dorsal), 0.5.
Larval diagnosis. The larva of P. lepidus can be distinguished from all other congeners by the following combination of characters: fourth antennomere reduced and knob-like (Fig. 11b); mandibular formula: L 1 2 3 4 0 a (m 1,2,3,4) b; R 1 2 3 4 y ab (Figs. 10a–c); galeolacinia with 4 ventral teeth, the first one (basal) 1/2 length of the second (Fig. 10e), palp stout, with very thin marginal setae on basal 2/3 of outer margin, and stiff setae on apical 1/3 (Fig. 10d); prementum subquadrate (Fig. 10g), lateral margins with a row of minute spines, dorsal surface with a subbasal group of 3–4 stout spine like setae; ligula not projected, with 14 tubercles and two rows of flat setae (the ventral row formed by short blunt ones, the dorsal row by slender and acute ones, Fig. 10f); palp with tongue-like distal projection 1/2 length of movable hook, inner margin crenulated; movable hook stout, slightly shorter than outer palpal margin; claws normal (long and acutely pointed, flattened), not cheliform (Fig. 10g), hind claw with a subapical seta; thorax and legs with whitish setae; pro- and mesotibia with distal spurs; hind tarsi concolorous with others; posterolateral spines present on S6–9 (Fig. 11a); large blunt and laterally flattened dorsal tubercles on terga S2–9 (Figs. 11c); sterna S2–9 formed by 3 plates, except S8 by 5 plates (Fig. 11d); apical abdominal segments and anal pyramid stout, relative length of sternum S8: S9: S10: paraproct = 1.4: 1.4: 1: 1.2 (Figs. 11d–e).
The larva diagnosed above was identified as P. lepidus following the original description and figures (Needham 1941). From the list above, most important characters include the form of third antennal segment and the short cerci. An unidentified larva of Progomphus was also collected in Misiones, very similar to L. lepidus, except for the presence of 25 tubercles in the ligula (instead of 14 in P. lepidus), and the shape of third antennal segment, oblong and relatively slender (stout and subcircular in P. lepidus). See further discussion under P. joergenseni.
Distribution. Argentina (Misiones), Brazil and Uruguay (Belle, 1973; von Ellenrieder et al. 2009; Kittel & Engels 2016).
description: Published as part of Molineri, Carlos, Rodríguez, José Sebastián, Leiva, Marta & Márquez, Javier Andrés, 2023, Diagnoses and key for the larvae of Progomphus Selys, 1854 from Argentina (Anisoptera: Gomphidae), with first larval descriptions for P. aberrans Belle, 1973 and P. kimminsi Belle, 1973, pp. 239-259 in Zootaxa 5297 (2) on pages 253-255, DOI: 10.11646/zootaxa.5297.2.4, http://zenodo.org/record/7993190