Miocora aurea (Ris, 1918)

Novelo-Gutiérrez, Rodolfo & Bota-Sierra, Cornelio Andrés, 2022, Description of the final larval stadium of Miocora aurea (Ris, 1918) (Odonata: Polythoridae), Zootaxa 5182 (3), pp. 279-287 : 280-285

publication ID

https://doi.org/10.11646/zootaxa.5182.3.5

publication LSID

lsid:zoobank.org:pub:3D2BDB81-78E8-4F6D-AA21-7A1147E64923

DOI

https://doi.org/10.5281/zenodo.7053019

persistent identifier

https://treatment.plazi.org/id/252E2B12-B27F-3A02-FF38-E3BF646DAF74

treatment provided by

Plazi

scientific name

Miocora aurea (Ris, 1918)
status

 

Miocora aurea (Ris, 1918)

Figures 1–8 View FIGURE 1 View FIGURE 2 View FIGURE 3 View FIGURE 4 View FIGURE 5 View FIGURE 6 View FIGURE 7 View FIGURE 8

Material. One exuvia (1 ♀, reared), 9 F-0 larvae (6 ♂♂, 3 ♀♀). COLOMBIA: Risaralda Department, Tatamá National Park, Pueblo Rico Municipality , Monte Bello Township , Montenegro stream, 5.2273°N, 76.0830°W, elev. 1363 m, 12 February 2019, C. Bota, R. Novelo, R.W. Sites leg, 3 ♂♂, 3 ♀♀ (1 ♀ emerged on 13 February 2019) GoogleMaps ; same data but 2 nd order tributary stream of Río Taibá , 5.2164°N, 76.0883°W, elev. 1600 m, 13 February 2019, C. Bota, R. Novelo, R.W. Sites leg., 3 ♂♂ GoogleMaps ; same data but Minas de Cristal de Cuarzo stream, 5.2286°N, 76.0981°W, elev. 1480, 14 February 2019, C. Bota, R. Novelo leg., 1 ♀ GoogleMaps .

Description. Larva robust ( Fig. 1 View FIGURE 1 ), dorsally yellowish-brown anteriorly, dark brown posteriorly, ventrally yellow anteriorly, grayish-violet posteriorly. Abdomen strongly convex dorsally, flat ventrally; digitiform, coiled, ventrolateral gills on S2–7; caudal gills petiolate, inflated, and scaly.

Head: Wider than long, posterior margin widely concave, dorsal color yellowish-brown with darker areas in a complex color pattern ( Fig. 2a View FIGURE 2 ). Labrum mostly yellowish-brown, sides brown, covered with minute spiniform setae, distally setose, ventrally flat ( Fig. 2b View FIGURE 2 ); clypeus yellowish-brown, with a pair of parallel, white narrow lines along middle third. Frons reddish-brown, vertex yellowish-brown, both flat and granulose, with three large pale ocelli on vertex. Antennae 7-segmented ( Fig. 2a View FIGURE 2 ), longer than head, scape and pedicel brown beset with small scalelike setae, flagellomeres yellowish-brown becoming paler on tip, with minute scale-like setae; size proportion of antennomeres (from basal to apical): 0.70, 1.0, 0.75, 0.50, 0.45, 0.30, 0.20. Compound eyes large, strongly bulging ( Fig. 2a View FIGURE 2 ), with a row of large, dark brown scale-like setae arranged in palisade following the ventral margin of eyes ( Fig. 2b View FIGURE 2 ). Occiput shorter than compound eye dorsal length; cephalic lobes rounded, yellowish-brown dorsally, dark brown posteriorly, beset with small scale-like setae ( Fig. 2a View FIGURE 2 ); subocular areas of head yellow, with a well-developed, longitudinal carina which extends to posterior margin of cephalic lobes ( Fig. 2b View FIGURE 2 ). Mandibles ( Figs. 3a–d View FIGURE 3 ) with molar crest, with following formula: L 1’1 2 3 4 0 a b / R 1’1 2 3 4 y a (m 1–5 or 6) b, both mandibles fringed with a ventral and dorsal, transverse, row of long, stiff setae; basal-external surface shallowly concave. Ventral pad of hypopharynx creamy-pale ( Fig. 2b View FIGURE 2 ), subpentagonal, posterior margin concave, anterolateral margins setose. Maxilla: galeolacinia ( Fig. 4 View FIGURE 4 ) with seven teeth, three dorsal teeth moderately incurved ( Fig. 4a View FIGURE 4 ), approximately same size and longest, three ventral teeth of different sizes and shortest ( Fig. 4b View FIGURE 4 ), apical tooth stoutest, a row of 8–10 reddish-brown, stout, long, incurved setae preceding ventral teeth a row of long, white, delicate setae preceding dorsal teeth; maxillary palp shorter than galeolacinia, setose, ending in a robust blunt spine. Labium yellow. Prementum-postmentum articulation reaching anterior margin of mesosternum ( Fig. 1b View FIGURE 1 ). Prementum subpentagonal ( Fig. 5a View FIGURE 5 ), yellow ventrally with a subquadrate gray spot on each side of midline just below of ligula, 0.20x longer than its widest part, lateral margins sinuose and smooth; ligula convex, moderately developed ( Fig. 5b View FIGURE 5 ), 0.18–0.20 as long as its basal width measured dorsally, distal margin serrulate with a small, narrow, v-shaped, median cleft, a small, submarginal tooth on each side of median cleft but rather far from it. Premental palp reddish-yellow, smooth ( Fig. 5b View FIGURE 5 ) with three end hooks shorter than movable hook, the ventral (mesal) one shortest and truncated, internal margin of palp finely serrate; movable hook reddish, smooth, incurved, sharply-pointed, shorter than palpal lobe.

Thorax: Pronotal disk subtrapezoid ( Fig. 1a View FIGURE 1 ), mostly yellowish-brown with abundant, minute, scale-like setae, anterior lobe large and subtriangular, anterior margin straight, lateral margins concave at middle, slightly reflexed and rimmed, anterolateral corners produced as a blunt, triangular process, posterior margin straight, all margins beset with scale-like setae; propleura reddish-brown, propleural apophyses short and roundly-pointed, beset with scale-like setae, proepimeral apophysis largest. Pterothorax mostly dark brown ( Figs. 1a, c View FIGURE 1 ), covered with minute scale-like setae, ventral margin of mesothorax straight, that of metathorax sinuose. Wing sheaths mostly yellowishbrown, with basal and costal areas reddish-brown ( Figs. 1a, c View FIGURE 1 ), anterior pair reaching basal half of S7, posterior pair reaching posterior margin of S7, both in individuals with abdomen not relaxed. A blunt, conical, median, dorsal protuberance on posterior margin of metanotum. Legs long ( Fig. 1a View FIGURE 1 ) (i.e., tip of metatibiae surpassing well S10 when fully extended), beset with scale-like setae of different sizes excepting on tarsi; all tibiae longer than respective femora. Femora largely light-brown, laterally compressed; tibiae and tarsi light-yellowish-brown; apicalinternal margin of tibiae with 4–5 thick, robust, reddish, spine-like setae ( Fig. 5c View FIGURE 5 ); tarsi with abundant, stiff setae on ventral surface; pretarsal claws simple, widely separated each other, hooked on apex, with pulvilliform empodium. Thoracic sternum light yellowish-brown, beset with dark scale-like setae; metasternum divided into four sternites, with laterosternites produced medially as large ovoid plates ( Fig. 1b View FIGURE 1 ).

Abdomen: Subcylindrical, strongly convex dorsally, flat ventrally, wider at base, narrowing caudally ( Fig. 1 View FIGURE 1 ). Tergites brown to dark brown, usually light yellowish-brown on midline of S8–10 ( Fig. 6a View FIGURE 6 ),, beset with small scale-like setae on S3–10 including posterior margins; posterior margin of S10 with a middle, deep, U-shaped emargination. Dorsal protuberances well-developed, caudally-directed, and roundly-tipped on S2–9 ( Fig. 6b View FIGURE 6 ). Lateral margins of S1–8 ventrolaterally expanded, those of S7–8 more developed covered with abundant scale-like setae. Sternum mostly light brown, sterna beset with small scale-like setae. A pair of ventrolateral, grayish-violet, digitiform, tapering, coiled fleshy gills on S2–7 ( Fig. 6c View FIGURE 6 ). Male gonapophyses ( Fig. 6d View FIGURE 6 ) small, with an obtuse tip that reaches the posterior margin of S9, with scale-like setae. Female gonapophyses ( Figs. 7a, b View FIGURE 7 ) well-developed, surpassing by much posterior margin of S10 ( Fig. 7a View FIGURE 7 ); lateral valves densely covered with dark brown scale-like setae on basal 0.80, distal 0.20 smooth, digitiform, and roundly-poited ( Fig. 7a View FIGURE 7 ), central and dorsal valves smooth, 0.21x longer than lateral valves ( Fig. 7b View FIGURE 7 ). Male cerci creamy pale ( Figs. 7c, d View FIGURE 7 ), with dark brown scale-like setae on dorsal surface, in lateral view subquadrate ( Fig. 7d View FIGURE 7 ), dorsal margin slightly convex, ventral margin shallowly concave, distal margin straight, distoventral corner slightly produced ventrally ( Fig. 7d View FIGURE 7 ), in dorsal ( Fig. 7c View FIGURE 7 ) and ventral view appearing digitiform. Female cerci as in male but conical and roundly-pointed in lateral view ( Fig. 8a View FIGURE 8 ). Caudal gills petiolate and inflated ( Figs. 1 View FIGURE 1 , 6a, d View FIGURE 6 , 7d View FIGURE 7 , 8 View FIGURE 8 ), densely covered with scale-like setae, with 4–5 small, conical, roundly-pointed projections ( Figs. 6a View FIGURE 6 , 8 View FIGURE 8 ); central gill (epiproct), in caudal view ( Fig. 8b View FIGURE 8 ), laterally compressed, with five projections ( Fig. 8a View FIGURE 8 ); lateral gills (paraprocts) larger and more inflated than central gill, with four projections, the mesal and ventral surfaces grayish-violet, largely smooth, apparently concave but becoming inflated in alcoholic specimens.

Measurements [averages in brackets]: F-0 larvae: Total length (without caudal lamellae) 10.1–13.7 [12.2; N=9]; maximum width of head 3.1–3.8 [3.62; N=9]; hind femur 3.0–3.4 [3.07; N=9]; abdomen 4.0–6.3 [5.55; N=9]; paraprocts 2.8–3.0 [2.9; N=8]; epiproct 1.8–2.2 [1.98; N=7]. Exuvia: TL 11.5; MWh 3.9; Hf 3.2; Ab 5.0; Pp 2.8.

Diagnosis. The larva of M. aurea is very similar to the larva of M. chirripa , but with the following differences [in square brackets M. chirripa ]: pedicel 0.25x longer than 3 rd antennomere [0.35]; prementum 0.20x longer than its widest part [0.18x]; posterior margin of tergite 10 with a moderate incision [with a deep incision].

Habitat. Larvae of M. aurea inhabit small shallow forested streams, crawling among sand, gravel, small stones where the water flow is moderate.

Kingdom

Animalia

Phylum

Arthropoda

Class

Insecta

Order

Odonata

Family

Polythoridae

Genus

Miocora