Phyllogomphoides indicatrix Belle, 1989

Torres-Pachón, Mónica, Novelo-Gutiérrez, Rodolfo & Ruiz-Sanchez, Eduardo, 2019, A synopsis of Phyllogomphoides Belle, 1970 (Odonata: Gomphidae) of Mexico: taxonomy and distribution, Zootaxa 4634 (1), pp. 1-67 : 25-27

Phyllogomphoides indicatrix Belle, 1989

Phyllogomphoides indicatrix Belle, 1989: 155–157 [Tijdschrift voor Entomologie 132] (♂)

Type. Not examined.

Type repository. National Museum of Natural History, Smithsonian Institution ( USNM) (Not examined).

Material studied: Total specimens: 2♂♂, distributed like thus: 1♂ ( IEXA), 1♂ ( UNAM). MEXICO: Chiapas; El Aguacero , 14 July 1993, E. González leg., 1♂ ; Puente La Cintal, Km 82 carr. Ocozocuautla-Cintalapa , Arroyo bajo el puente, elevation 522m, 26 March 2012, R. Novelo, J.A. Gómez leg., 1♂ .

Description of male. Body dark brown, with five pale stripes on pterothorax.

Head: Face pale; labium pale and submentum light brown; labrum pale with a vertical, wide, brown band on middle, anterior and posterior border light brown; mandibles pale basally, tips reddish-brown; anteclypeus pale, sometimes with small light brown spots in middle; postclypeus light brown with lateral pale spots; lower surface of antefrons brown, upper of antefrons and postfrons mostly pale (sometimes upper surface completely brown), a blackish-brown stripe at the union with vertex; antennal scape and pedicel dark brown, flagellum brown; vertex brown, depressed area between ocelli with a large, quadrate pale spot; occiput brown with a large, trapezoid, central pale spot, posterior border fringed with long, stiff, reddish-brown setae ( Fig. 23 ).

Thorax: Pronotum reddish-brown, anterior lobe completely pale, middorsal lobe with a pale middorsal twinspot, and posterior lobe completely brown. Pterothorax reddish-brown, with five pale stripes as show in Fig. 23 ; middorsal thoracic carina pale; first antehumeral stripe connected to pale mesothoracic collar forming an inverted “7” reaching border of antealar crest superiorly; second antehumeral stripe continuous, ending in the upper end in a circular spot close to antealar crest; mesepimeral stripe wider than second antehumeral stripe, covering most of mesepimeron (90–95%), more or less parallel sided; metepisternal stripe covering the full-length of metepisternum, almost encircling the spiracle, and forming a circular spot superiorly; metepimeral stripe forming and inverted thin “L” reaching subalar carina; metaposternum pale; pectus light brown. Legs: Femora mostly light brown, distally dark reddish-brown, anterior femora broadly pale ventrally; tibiae reddish-black, armature black; tarsi and pretarsal claws reddish-black. Wings: Hyaline, tinged with brown at extreme base, venation black, anterior margin of costae with a continuous well-defined yellow line in all the wings; second primary antenodal crossveins the 8th (left), the 7th (right) in FW, the 7th (left), the 8th (right) in HW; antenodal crossveins: FW 23–25, HW 16–18; postnodal crossveins: FW 14–15, HW 14–16; second serie antenodal crossveins: FW 23–25, HW 19; triangles 3-celled; subtriangles 2-celled in FW, 2-celled in HW, sometimes 3-celled; supratriangles 3-celled (rarely 4-celled); anal triangle 4-celled; pterostigma dark brown.

Abdomen: Reddish-brown on S1–2, black on S3–7, S8 black on dorsum with lateral large pale spots, S9 black on dorsum and laterally, S10 dark brown. Pale coloration creamy yellow as follows: a middorsal stripe and ventral 0.50–0.70 of tergum on S1; a middorsal stripe, auricles, and a posteroventral, narrow, vertical spot on S2; a middorsal stripe on basal 0.75–0.80 its length, and a broad basoventral spot on basal 0.20–0.40 of S3; a middorsal stripe on basal 0.80–0.85 tapering posteriorly, a broad basoventral spot on basal 0.20–0.25 of S4; a middorsal stripe on basal 0.30–0.50 tapering posteriorly, a broad basoventral spot on basal 0.15–0.20 of S5; a middorsal spot on basal 0.10–0.15, a broad basoventral spot on basal 0.20–0.25 of S6; basal half or less of S7; pale strikes on basoventral 0.70–0.80 of S8; S9 and S10 without pale spots. Foliation on S8–9 thin and scalloped, foliation on S8 increasing gradually in width caudally, ending in a small rounded lobe which surpasses slightly by 0.10–0.20 the anterior margin of S9, its edge with a row of small spines on apical 0.50–0.60 of its length, maximum width of foliation 0.30– 0.35 mm; foliation on S9 0.15–0.20 mm wide, the same width along the entire, smooth margin ( Fig. 36 ). Accessory genitalia: Anterior lamina thick, entire, anterior margin straight; in ventral view, anterior hamuli tumid anteriorly twice as wide at base than the entire hooked apex, with a large, transversal, subrectangular, excavate area on the lateroexternal surface; mesal margin widely and deeply emarginated at basal 0.70 (emargination width 0.16–0.18 mm), the basal margin of the emargination ending in a thick, rounded edge, distal end of hamuli hooked-like with tip incurved and directed mesally; posterior hamuli subcylindrical widening posteriorly with a short, thick, bluntly pointed tip directed mesally, with abundant long and short, stiff brown setae ( Figs. 55–56 ). Vesica spermalis : V1 bifid with a large tooth on middle, V2–3 of usual type, V4 with two relatively short flagella not reaching posterior margin of V1. Caudal appendages: Cerci, with moderately long, bristle-like setae, dorsally pale on apical 0.65–0.80 its length, basal 0.35–0.20 of ventral surface and apices mostly black, a dorsomesal roundly pointed tooth, 0.30 mm length, at basal 0.78–0.85 and directed medially, followed by a mesal, subapical, shelf-like carina, cerci tips slightly flattened laterally and produced dorsally into a spine and sometimes with a tiny tip ventrally, little notorious; in lateral view tip of cercus produced dorsally into a large, wide spine; in ventrolateral view with a short, spine 0.10 mm length at basal 0.15–0.20. Epiproct brown with few, short, whitish hairs; in dorsal view V-shaped, tips slightly sharp, separate from each other by a distance of 0.70–0.80 mm; in lateral view, branches slightly up-curved, almost straight ( Figs. 87–89 ).

Measurements: TL, 59.5–61.4; AL, 42.5–44; MWh, 8.1–8.3; FwL, 36–38; HwL, 34–36.5; FwW, 8–8.5; HwW, 10–10.5; HfL, 6.2–6.4; cerci length, 3.3–3.5.

Female. Unknown.

Comparative diagnostic notes. This species closely resembles P. pacificus . Phyllogomphoides indicatrix is medium-sized, P. pacificus is from small to medium size. Males can be differentiated from P. pacificus by the following (features of the later in parentheses): middle part of anterior lamina concave (middle part of anterior lamina projected ventrally as a subtrapezoid tubercle); basal half of anterior hamulus with the anterior edge of mesal emargination four times shorter than its mesal margin (basal half of anterior hamulus with the anterior edge of mesal emargination subequal to its mesal margin); tip of posterior branch of anterior hamulus directed dorsomesally (tip of posterior branch of anterior hamulus directed posterodorsally).The female of P. indicatrix is unknow. On the other hand, the geographic distribution pattern of P. indicatrix is poorly known because there are only two records from Chiapas State, in contrast to the wide geographic distribution of P. pacificus . Similarily, P indicatrix can be separated from other species by the mesal margin of anterior hamulus broadly emarginate (mesal margin and apex entire [ P. suasus ]; from P. apiculatus , P. danieli , P. enriquei and P. luisi by the mesal margin of anterior hamulus broadly emarginate on distal half (mesal margin of anterior hamulus notched, with a tooth or hook or lacking any of them); and from the remaining species by the anterior hamulus with mesal margin broadly emarginate on distal half and apex entire and rounded (anterior hamulus with mesal margin entire, with the apex cleft forming two subequal branches).

Flight season. March, April (No record, but this is supposed because it is the period of low precipitation range), May (no record), June (no record), and July.

Distribution. Chiapas ( Fig. 147 ). Only in Mexico.

Natural history. The type locality is a wide river, rocky bottomed river, with emergent vegetation and some sections with sand, it is shallow with some sections deeper. The surrounding vegetation has a strong human intervention such as roads and houses (MTP, personal observations). According to the records, this species has an altitudinal distribution in Mexico from 522 to 750masl.

Figures

FIGURES 23–29. Head and thorax, lateral view. 23) P. indicatrix, male (alcoholic teneral specimen); 24) P. luisi, male; 25) P. nayaritensis, male; 26) P. pacificus, male; 27) P. pugnifer, male; 28) P. stigmatus, male; 29) P. suasus, male.

FIGURES 30–36. Abdominal segments S8–10 and caudal appendages, left lateral view. 30) P. albrighti, male; 31) P. apiculatus, male; 32) P. bifasciatus, male; 33) P. danieli, male; 34) P. duodentatus, male; 35) P. enriquei, male; 36) P. indicatrix, male (alcoholic teneral specimen).

FIGURES 53–62. Male accessory genitalia, ventral and ventrolateral view. 53–54) P. enriquei; 55–56) P. indicatrix (alcoholic teneral specimen); 57–58) P. luisi; 59–60) P. nayaritensis; 61–62) P. pacificus.

FIGURES 84–95. Male caudal appendages, dorsal, lateral and ventral view. 84–86) P. enriquei; 87–89) P. indicatrix (teneral preserved in alcohol); 90–92) P. luisi; 93–95) P. nayaritensis.

FIGURES 147–148. Maps of geographical distribution. 147) P. indicatrix; 148) P. luisi.