Argia rudolphi Garrison & von Ellenrieder,

Garrison, Rosser W. & Ellenrieder, Natalia Von, 2017, New species of the damselfly genus Argia from Mexico, Central America and Ecuador with an emphasis on Costa Rica (Insecta: Odonata: Coenagrionidae), Zootaxa 4235 (1), pp. 1-93: 23-25

publication ID

http://doi.org/ 10.5281/zenodo.322062

publication LSID

lsid:zoobank.org:pub:AEA565CC-1A14-4987-977A-1C269B0FE2A8

persistent identifier

http://treatment.plazi.org/id/A1504043-9A24-FFD0-FF39-FBDCFBE9FA1B

treatment provided by

Plazi

scientific name

Argia rudolphi Garrison & von Ellenrieder
status

n. sp.

Argia rudolphi Garrison & von Ellenrieder  , n. sp.

Figs. 19View FIGURES 17 – 20 (head, thorax, S1– 4 ♂); 43 (head, thorax, S1– 4 ♀); 68 (S7– 10 ♂); 92 (S7– 10 ♀); 113 (mesostigmal plates ♀); 154 (appendages ♂); 168 (map); Table 2 (measurements).

Etymology. Named rudolphi  (Latinized name) in honor of our colleague Rainer Rudolph, in recognition for his generous support of the International Dragonfly Fund, which has helped further the knowledge of Odonata  worldwide over the past twenty years.

Specimens examined. 18 ♂, 5 ♀. Types. Holotype ♂: MEXICO  , Puebla State, Zihuateutla, Sierra de Huauchinango  , La Unión, in drainage area (20°14'25'' N, 97°53'38'' W, 596 m), 21 v 1987, R. Novelo & A. Gomez leg. [ CSCA]GoogleMaps  . Paratypes: MEXICO  , Hidalgo State: 6 ♂, 3 ♀, stream with cascade 7 km N of Tlanchinol (21°3'5'' N, 98°40'4'' W, 1,300 m), 21 vii 1992, G. Harp leg. [RWG]GoogleMaps  ; 2 ♂, same data but 22–23 vii 1992, TWD leg. [RWG]; Puebla StateGoogleMaps  : 1 ♂, Zihuateutla, Sierra de Huauchinango, km 3 road to. La Unión, Zona Cafetalera in drainage area (20°15'31'' N, 97°52'5'' W, 570 m), 23 vii 1987, R. Novelo leg. [ CSCA]GoogleMaps  ; 4 ♂, same data but [RWG]GoogleMaps  ; 3 ♂, 1 ♀ (one pair in tandem), same data as holotype [RWG]; Veracruz State  : 1 ♂, 1 ♀ (in tandem, female ovipositing), El Muro, km 14 on road 131 Tlapacoyan-Altotonga (19°52'41'' N, 97°13'41'' W, 1,100 m), 15 vii 2000, R. Novelo leg. [RWG].GoogleMaps 

A medium-sized largely violaceous-blue species ( Figs. 19View FIGURES 17 – 20, 68View FIGURES 63 – 72, based on well-preserved material) with approximate cerci ( Fig. 154View FIGURES 154 – 155) the male of which is similar to A. anceps  ( Figs. 20View FIGURES 17 – 20; 69; 181), A. fissa  ( Figs. 21View FIGURES 21 – 23; 70; 183) and A. westfalli  ( Figs. 22, 23View FIGURES 21 – 23, 71, 72View FIGURES 63 – 72).

Description of male holotype. Head ( Fig. 19View FIGURES 17 – 20): Labium pale except for small black medial spot at base; ante- and postclypeus, antefrons, base of mandibles, anterior half of scape and genae pale, remainder of head black with violaceous postocular spots confluent with eyes, incomplete pale occipital bar and small pale spot anterolateral to lateral ocellus; posterior half of scape and remainder of antennae black, rear of head washed with black, especially medially, margin bordering eye margin pale.

Prothorax black with following areas pale: obscure lateral spot on anterior lobe, dorsolateral spot on middle lobe, lateral 0.30 of posterior margin of pronotum, propleuron except for notopleural suture. Pale areas of pterothorax violaceous blue, with black middorsal stripe about as wide as pale antehumeral stripe, the latter slightly narrowing dorsally; anterior half of mesinfraepisternum black, continuous with broad humeral stripe at base, then narrowing at basal fifth along mesopleural suture, then abruptly forming a thin hairline at 0.50 before expanding again at mesopleural fossa and connecting narrowly below antealar crest with middorsal stripe above; metapleural suture with a narrow black stripe separating paler areas on side of thorax ( Fig. 19View FIGURES 17 – 20). Wings hyaline with venation black; pterostigma dark brown, surmounting 2 cells in both Fw and 2 cells in left Hw [distal 0.80 of right Hw missing]; postnodals Fw 18/19, left Hw 16; postquadrangular cells Fw 4/4, left Hw 3; RP2 at Fw 8/8, left Hw 6. Coxae and trochanters pale medially washed with brown; extensor surfaces of tibiae pale, remainder of legs and armature black.

Abdomen ( Figs. 19View FIGURES 17 – 20, 68View FIGURES 63 – 72) mostly violaceous blue; S1 pale with narrow black basal ring expanding dorsally to form a connected black spot occupying basal 0.50; S2 pale above with an incomplete black lateral stripe widening posteriorly and ending at distal 0.30, this stripe connected to obscure black spot below thus isolating pale areas anteriorly and posteriorly, genital lobe not strongly produced, apical annulus black; S3 pale with an narrow lateral black stripe, apical 0.20 including annulus black except for small isolated transverse spot before annulus; S4 similar to S3 but with remnant of postbasal streak; S5 similar but postbasal streak more extensive with vestigial line connecting to apical black; S6 with postbasal black confluent with apical black thus forming a broad ventral stripe; S7 black except for narrow pale ring with a broad triangular extension middorsally ending at basal 0.20; S8– 10 pale dorsolaterally and black ventrally; torus pale, cerci black; dorsal portion of paraprocts pale, ventrally black.

Genital ligula ( Fig. 137View FIGURES 134 – 137) similar to A. elongata  (as in Fig. 132View FIGURES 132 – 133) but tip narrower. Lateral lobes appressed to lateral margin of distal segment

Torus large, transversely triangular, swollen ventrally, occupying ventral half of torifer and overlapping recessed bilobed epiproct ( Fig. 154View FIGURES 154 – 155 c); narrow area around epiproct and extreme base of same black; cercus roughly quadrate in dorsal view with outer margin about 1.5 times as long as inner margin ( Fig. 154View FIGURES 154 – 155 c); in mediodorsal view upper surface slightly concave with a broadly based tooth at basal 0.20 ( Fig. 154View FIGURES 154 – 155 a, d); in lateral view, narrowly triangular, subequal to length of paraproct ( Fig. 154View FIGURES 154 – 155 b); paraproct slightly bilobed, its ventral branch much smaller than longer, anteriorly directed, bluntly triangular dorsal branch, its tip, viewed mediodorsally ( Fig. 154View FIGURES 154 – 155 a), directed medially.

Dimensions. Hw 21.5, abdomen 30, total length 37.5.

Description of female paratype ( Mexico: Veracruz State, El Muro, km 14 on road 131 Tlapacoyan- Altotonga). Similar to male but pale color light blue. Head ( Fig. 43View FIGURES 43 - 46) as in male but with a black basal spot mediolaterally on labrum and postocular spots larger and confluent with eye, prothorax as in male but black areas less extensive, pterothorax with humeral stripe narrower and more deeply forked; S1 as in male; S2 with dorsal oval spot at basal 0.60, apically and laterally with black interrupted below by a pale lateral stripe narrowed at apical 0.30, pale lateral stripe bordered below by a black stripe; S3 dorsally pale with apical 0.30 black, the latter with a ventral offshoot of black along ventral margin and expanding at basal 0.10 and almost connecting with an elongate postbasal streak, which is at first broad but narrows to a thin line just connecting with apical black; S4–5 similar to S3 but black more extensive, isolating a pale midlateral stripe; dorsal blue also reduced, especially apically, but with an incomplete pale basal ring; S6–7 black with an incomplete pale basal ring; S8 blue dorsally, black at basal 0.20 and laterally; S9 blue dorsally with a black dorsolateral spot at basal 0.50 and connected to lateral stripe below; S10 blue dorsally, black laterally; appendages and ovipositor black.

Mesostigmal lobe forming a broad oval ( Fig. 113View FIGURES 113 – 115 a, b), about twice as wide as high, occupying medial 0.60 of posterior margin of mesostigmal plate ( Fig. 113View FIGURES 113 – 115 c), medial margin thickened with a slightly recurved margin ( Fig. 113View FIGURES 113 – 115 d, e), and slightly overlying fork of middorsal carina; distance between mesostigmal lobes small, barely separated ( Fig. 113View FIGURES 113 – 115 a, c); in lateral view, lobe erect with posterior margin curving medioposteriorly ( Fig. 113View FIGURES 113 – 115 g).

Variation in paratypes. Little variation was observed in the paratype series. One male (Sierra de Huauchinango) had a small indication of a forked humeral stripe; another male (same locality) had reduced black abdominal markings thus isolating black postbasal streaks on S4–5 similar to S 4 in Fig. 19View FIGURES 17 – 20. The small lateral lobes on the genital ligula of the holotype ( Fig. 137View FIGURES 134 – 137 b) are adjacent to the sides of the ligula, but in paratypes they are usually separated basally as in A. elongata  ( Fig. 132View FIGURES 132 – 133 b). Females can be blue ( Fig. 43View FIGURES 43 - 46) or brown. Pterostigma surmounting 1–2 cells in males and females; postnodals: Fw 16–20 in males and females, Hw 12–18 in males, 15– 17 in females; postquadrangular cells Fw 3–5, Hw 3–4 in males, Fw 4, Hw 3 in females; RP2 at Fw 7–8, Hw 6–7 in males and females. Dimensions. ♂: Hw 23 ± 1.95 [20–24], abdomen 30.3 ± 1.69 [27.6–33.1], total length 38.4 ± 2.17 [35.4–41.9]; ♀: Hw 24.8 ± 1.74 [22.3–26.5], abdomen 29.4 ± 2.11 [28.6–31.3], total length 37.7 ± 2.73 [33.5– 40.1].

Diagnosis. This species may be confused with three other largely blue species, two of which, A. anceps  and A. westfalli  , are sympatric with A. rudolphi  ( Fig. 168View FIGURES 167 – 168). The cerci in male A. rudolphi  are more approximate, with their inner surfaces nearly touching in normal position ( Fig. 154View FIGURES 154 – 155 c); in both A. anceps  ( Fig. 155View FIGURES 154 – 155 c) and A. westfalli  ( Fig. 157View FIGURES 156 – 157 c), the cerci are widely separated by a gap subequal to the basal width of each cercus. In dorsomedial view, the cercus of A. rudolphi  ( Fig. 154View FIGURES 154 – 155 d) is less elongate than in either A. anceps  ( Fig. 155View FIGURES 154 – 155 d) or A. westfalli  ( Fig. 157View FIGURES 156 – 157 d). The nearly approximate condition of the cerci in A. rudolphi  ( Fig. 154View FIGURES 154 – 155 d) is similar to that of the more southerly ( Costa Rica to Colombia) A. fissa Selys  ( Fig. 156View FIGURES 156 – 157 c), but the transverse width of the torus in A. fissa  ( Fig. 156View FIGURES 156 – 157 c) is subequal to the transverse width of each cercus; in A. rudolphi  the transverse width of each torus is about half the transverse width of each cercus ( Fig. 154View FIGURES 154 – 155 c). The tip of the terminal segment of the genital ligula in A. rudolphi  is short and narrow, ending in a more or less ridged trough-shaped tip ( Fig. 137View FIGURES 134 – 137); the tip in the other three species is longer and flexible and can assume the shapes illustrated here ( A. anceps  Figs. 134–136View FIGURES 134 – 137; essentially the same for A. fissa  and A. westfalli  ). The ectobasal portion of the terminal segment of the genital ligula in A. anceps  ( Fig. 134View FIGURES 134 – 137 a, b), A. fissa  , and A. westfalli  has a prominent narrow mound-like lobe that is absent in A. rudolphi  ( Fig. 137View FIGURES 134 – 137 a, b). The following field markings will also distinguish male A. rudolphi  from A. anceps  , A. fissa  and A. westfalli: The  black postbasal streaks (sometimes extensive) present on S 4–6 in A. rudolphi  ( Fig. 19View FIGURES 17 – 20) are absent in A. anceps  ( Figs. 20View FIGURES 17 – 20; 181), A. fissa  ( Figs. 21View FIGURES 21 – 23; 183) and A. westfalli  ( Figs. 22, 23View FIGURES 21 – 23); the wings are hyaline in A. rudolphi  and strongly tinged with yellow in A. anceps  , A. fissa  ( Figs. 181–183View FIGURES 181 – 183) and A. westfalli  ; and the pale coloration is violaceous blue in A. rudolphi  and vivid blue in A. anceps  , A. fissa  and A. westfalli  .

The large erect oval mesostigmal plates in A rudolphi  ( Fig. 113View FIGURES 113 – 115) are almost approximate and are similar only to those of A. fissa  ( Fig. 116View FIGURES 116 – 118) and, to a lesser extent, A. westfalli  ( Figs. 117, 118View FIGURES 116 – 118) and A. anceps  ( Figs. 114, 115View FIGURES 113 – 115). A transverse swollen tubercle is present at the base of the mesostigmal lobe in posterior view in A. anceps  ( Fig. 115View FIGURES 113 – 115 e); no tubercle is present in A. rudolphi  ( Fig. 113View FIGURES 113 – 115 e), A fissa  ( Fig. 116View FIGURES 116 – 118 e) or A. westfalli  ( Figs. 117View FIGURES 116 – 118 e, 118e). In A. rudolphi  , the medial margin of the mesostigmal lobe is swollen and slightly recurved ( Fig. 113View FIGURES 113 – 115 d, e); no such swollen area is present in A. fissa  ( Fig. 116View FIGURES 116 – 118 e) or A. westfalli  ( Figs. 117View FIGURES 116 – 118 e, 118e). In the field, females of A. rudolphi  ( Fig. 43View FIGURES 43 - 46) are easily distinguished from those of the other three species ( Figs. 44–46View FIGURES 43 - 46; 181–183) by the overall more extensive dark markings on the head (mostly black epicranium), thorax (prominent middorsal and humeral stripes), and abdomen (postbasal streaks coupled with distal and ventral black); the other three species are almost immaculate, there being only vestiges of black on the epicranium, a thin middorsal thoracic stripe, a narrow to absent humeral stripe, and vestiges of a distal black spot laterally on abdominal segments. The ovipositor in A. rudolphi  is black ( Fig. 92View FIGURES 89 – 95), not pale as in the other three species ( Figs. 93–95View FIGURES 89 – 95).

Habitat. Streams and drainage areas. Specimens were taken at elevations ranging from about 570 m (Sierra de Huauchinango) to 1,300 m (stream with cascade 7 km N of Tlanchinol). Specimens have been collected in May (Sierra de Huauchinango) and July (stream with cascade 7 km N of Tlanchinol).

Distribution. Limited to a small area in the Atlantic slope of central Mexico within Puebla, Hidalgo, and Veracruz states ( Fig. 168View FIGURES 167 – 168), where it occurs in sympatry with A. anceps  and A. westfalli  .

CSCA

California State Collection of Arthropods

Kingdom

Animalia

Phylum

Arthropoda

Class

Insecta

Order

Odonata

Family

Coenagrionidae

Genus

Argia