Heterolepisma andinum ( Silvestri, 1902 )

Molero-Baltanás, Rafael, Zúñiga-Reinoso, Álvaro, Gaju-Ricart, Miquel & Predel, Reinhard, 2025, Morphological and molecular revision of the subfamily Heterolepismatinae (Zygentoma, Lepismatidae), with descriptions of two new genera from the Atacama Desert, Chile, ZooKeys 1260, pp. 233-278 : 233-278

publication ID	https://doi.org/10.3897/zookeys.1260.151902
publication LSID	lsid:zoobank.org:pub:3A8CC4DB-048F-4A43-9568-FE283DAB257E
DOI	https://doi.org/10.5281/zenodo.17663900
persistent identifier	https://treatment.plazi.org/id/2E11EB07-B5FD-5E56-AC74-579C5E722020
treatment provided by	ZooKeys by Pensoft
scientific name	Heterolepisma andinum ( Silvestri, 1902 )
status

Treatment

Heterolepisma andinum ( Silvestri, 1902)

Figs 19 View Figure 19 , 20 View Figure 20

Lepisma andina Silvestri, 1902: 230. Type locality: Argentina, Mendoza, Cacheuta.

Heterolepisma andina (Silvestri). — Escherich 1905: 64.

Isolepisma andina (Silvestri). — Wygodzinsky 1948: 219.

Examined material.

Argentina • La Rioja Province, Sanogasta, Cuesta de Miranda , under stones; 29°21.05'S, 67°46.94'W; 2000 m a. s. l.; 13. II. 2022. Leg. A. Zúñiga. 1 ♀ * mounted on slide [ MZUC] GoogleMaps .

Descriptive remarks.

The specimen used for morphological studies, collected in an area of Argentine Andes close to the border with Chile, matches the combination of characters attributed to H. andinum in the key of Stach (1933) and the few useful traits indicated in the obsolete original description provided by Silvestri (1902). It has one pair of styli, the urotergite X is short, the posterior margins of urosternites II-VI bear more than 1 + 1 macrochaetae (four or five macrochaetae), and the submedian combs of urotergites are composed of only one macrochaeta (a second smaller seta is inserted obliquely to the larger macrochaeta, which depending on the criterion, could be also considered as the presence of a comb of two macrochaetae different in size). This insect is tentatively treated here as H. andinum .

Other characteristics of this Argentine species are detailed below.

Frontal fringe of macrochaetae continuous, without a clear median gap, approximately three or four rows of macrochaetae in the middle, with a wider triangular area laterally between frons and compound eyes (Fig. 19 A View Figure 19 ). Clypeus with 1 + 1 lateral tufts of macrochaetae (Fig. 19 A View Figure 19 ); scales not visible. Labrum with several bifid macrochaetae irregularly arranged in a transverse fringe. Scales on scapus lanceolate, with a small indentation at their apex (Fig. 19 B View Figure 19 ); scales on pedicel not detected. Several types of sensilla have been observed on the flagellum (chaetic, trichoid and trichobothria). Apical article of the maxillary palp bearing three small styloconic sensilla with few short cones; scales not observed on maxillary palp. Pronotal collar continuous, with abundant macrochaetae arranged in two to five rows (Fig. 19 C View Figure 19 ). Lateral margins of thoracic nota with several macrochaetae that in some cases are arranged in small combs of two or three macrochaetae and in some others they do not form clearly defined combs; in some positions isolated macrochaetae, which can be interpreted as reduced lateral combs; at the posterolateral corner there are 1 + 1 of such reduced combs of macrochaetae that consists of one to three macrochaetae and some small trichoid sensilla. Posterior margins of thoracic nota without setae (Fig. 19 C, D View Figure 19 ). Two pairs of trichobothria on each notum; on the pronotum, only a single trichobothrium detected at 0.69 of the lateral margin; this is probably the posterior trichobothrium. On the mesonotum, the anterior trichobothrium at 0.59 of the lateral margins and the posterior trichobothrium at 0.75 (Fig. 19 D View Figure 19 ). On the metanotum, anterior and posterior trichobothria are observed at 0.65 and 0.79 of the lateral margins, respectively (Fig. 19 E View Figure 19 ). Thoracic sternites parabolic, with 1 + 1 antedistal combs of three or four macrochaetae each (Fig. 19 F, G View Figure 19 ); these sternites are broken, and the prosternum is also bent on the slide, so their ratio length / width is not indicated. Scales of femora and tibiae lanceolate, with a small indentation at the apex (Fig. 20 A, B View Figure 20 ); tibial scales slightly smaller than femoral ones. Urotergites I-IV with 3 + 3 combs, the infralateral comb with four or five macrochaetae, the lateral combs with three or four macrochaetae, and the submedian comb is reduced to one or two macrochaetae (Fig. 20 C View Figure 20 ). Urotergites V-VII damaged, urotergite VIII with 2 + 2 combs (the submedian comb is missing). Urotergite IX apparently lacking setae; urotergite X short, convex, subtriangular to truncate, with the posterior margin almost straight (Fig. 20 D View Figure 20 ), with some marginal macrochaetae that do not form visible combs. Urosternite I damaged; urosternites II-VI with 1 + 1 combs of three or four macrochaetae (Fig. 20 E View Figure 20 ). Chaetotaxy of abdominal segment VII not clearly observed. Coxites VIII with a small comb of three macrochaetae, apparently lacking styli, so there is only one pair of styli on segment IX. Inner process of the coxite IX ~ 1.35 × longer than wide and 3.6 × longer than the outer process (Fig. 20 F View Figure 20 ). The styli are ~ 2.3 × longer than the inner process of the coxite IX. Ovipositor of the primary type, short, with ~ 32 or more divisions, surpassing the apex of styli only by 0.5 × and surpassing the apex of the inner process of the coxite IX by 2.2 × (Fig. 20 F View Figure 20 ); the available specimen seems to be subadult (suggested by the short divisions of gonapophyses) so it is likely that the ovipositor is longer in adult females. Epiproct densely covered by macrochaetae. Caudal filaments broken, their basal divisions apparently without scales (Fig. 20 D View Figure 20 ). Male specimens not available.