Dasyplocia, Gonçalves & Pescador & Peters, 2020

Gonçalves, Inês C., Pescador, Manuel L. & Peters, Janice G., 2020, A new genus of Euthyplociinae from Ecuador (Ephemeroptera: Euthyplociidae), Zootaxa 4759 (1), pp. 107-112 : 108-109

Dasyplocia gen. nov. Gonçalves, Pescador & Peters

Diagnosis: Male subimago – 1) Hind wing approximately 4x shorter than forewing ( Fig 17 ); 2) MP2 of forewing not recurved basally ( Fig 17 ); 3) Median caudal filament well developed.

Nymph – 1) Head almost as long as wide, length including clypeus more than 0.8x its width ( Figs 1–3 ); 2) Clypeus long, quadrate, with apicolateral projections ( Figs 1–3 ); 3) Mandibular tusks comparatively short, stout, densely covered with long hair-like setae and lacking spine-like setae ( Figs 1–3 ); 4) Tusk length about 6.5x width ( Figs 1–3 ); 5) Apex of tusks not truncated ( Figs 1–3 ); 6) Third segment of maxillary palp about 5.5x longer than wide ( Fig 13 ); 7) Apex of 3 rd segment of maxillary palp with acute, long and narrow projection ( Fig 14 ); 8) Apex of 3 rd segment of labial palp with rounded projection ( Fig 12 ); 9) Anterior margin of flanges on pronotum semi-rounded ( Figs 1–3 , 15 ); 10) Tarsus I with apical projection, projection about as long as tarsal claw ( Fig 4 ); 11) Tibia I with long projection, reaching half the length of tarsus ( Fig 4 ); 12) Tibial projection without setae on its margins; 13) Gill I with single lamella ( Fig 16 ).

Nymph: Head: Almost as long as wide, length more than 0.8x its width including clypeus; clypeus quadrate with medial region of anterior margin convex and anterolateral corners acute; antennae long, at least 3x longer than length of head ( Figs 1–3 ).

Mouthparts: Labrum: lateral margins subparallel; anterior margin with medial shallow emargination; lateral margins and dorsal surface with few scattered setae and median basal cluster of setae; anterior margin with dense row of setae ( Fig 8 ). Mandibular tusks a little longer than head (less than 1.25x length of head); tusks short, stout, sickle-shaped, lacking spine-like setae; densely covered with hair-like setae except for ventral surface; length about 6.5x width ( Figs 1–3 ). Right mandible: 4 apical denticles on outer incisor and 2 on inner incisor, prostheca absent ( Fig 11 ); left mandible: 4 apical denticles on outer incisor and 3 on inner incisor, prostheca sclerotized, straight and cylindrical ( Fig 10 ). Maxillae: 3 apical canines and one strong subapical setae; inner margin distally with 2 rows of strong setae; inner margin densely covered with long setae basally; outer margin of maxillae with long setae; apical margin with inner half covered with dense rows of shorter setae; basal segment of palpi with setae on lateral margins; 2 nd and 3 rd segments densely covered with setae on all surfaces; apex of 3 rd segment constricted, acute and narrow; 3 rd segment about 5.5x times longer than wide and 2x longer than 2 nd segment ( Figs 13–14 ). Labium: glossae and paraglossae densely covered with setae ventrally; glossae tear-drop shaped; paraglossae dorsal to glossae; outer margin of palpi with long setae, setae shorter on 1 st segment and denser on 3 rd segment; 3 rd segment with patch of short spine-like setae dorsally and 5 strong setae adjacent to patch; 3 rd segment more than 2x length and width of 2 nd segment, balloon-shaped with apex acute ( Fig 12 ). Hypopharynx: lingua subquadrate with shallow median emargination distally and with scattered long setae; distal margin densely covered with short setae; superlinguae with distal margin, inner margin and distal half of outer margin covered with long setae ( Fig 9 ).

Thorax: Collar on pronotum present. Pronotum with short anterolateral spines; marginal flanges progressively wider anteriorly, with wide and somewhat rounded apex ( Figs 1–3 and 15 ). Hind wing pads very small in comparison with forewing pads. Prosternum with a pair of oblique ridges, forming a narrow triangle with posterior margin.

Legs: Tarsal claws without denticles; legs covered with setae, setae sparse on middle and hind legs. Forelegs with coxae close to each other; anterior margin of femora covered with long setae on dorsal and lateral surfaces; tibiae and tarsi densely covered with long setae, apical projection of tibiae long (reaching half the length of tarsi), inner margin of projection glabrous; tarsi also with a long apical projection (about as long as tarsal claw) and covered with setae ( Fig 4 ). All legs without tibial suture; projection on tibiae bordered with strong setae; inner margin of tibiae and tarsi with row of strong setae. Hind legs with cluster of short setae on distal ventral surface; inner margin of tibiae with rows of short setae.

Abdomen: Gills on segments I-VII; gill I vestigial with broad single lamella ( Fig 16 ). Caudal filaments long, with setae along entire length.

Male subimago: The nymph with black wing pads provides a good view of the genitalia, terminal filaments and to a certain extent of the wings; wings were dissected from wingpads.

Wings: Forewing about 13.1 mm and hind wing about 3.3 mm. Dissected wings in poor condition; fork of vein MA of forewing distal to fork of vein Rs, MP2 straight, other veins and intercalaries not visible ( Fig 17 ). Hind wing torn; venation not clear.

Terminal Filaments: median caudal filament well developed (broken on its length) ( Fig 5 ).

Genitalia: Forceps with two segments, distal segment shorter than basal segment. Penes tubular, constricted apically ( Fig 5 ). Penes morphology is likely to change on adult male as is often the case in other Euthyplociidae such as in Campylocia .

Male imago, female imago and subimago: Unknown.

Etymology: “Dasys” – Greek word meaning “thick with hair” in reference to the dense concentration of long hair-like setae found on the mandibular tusks; plocia – as in genera of Euthyplociidae ; feminine.

Figures

FIGURE 17. Dasyplocia aequatorialis gen n. sp. nov.: 17—Fore- and hind wings dissected from mature male nymph.

FIGURES 1–7. Dasyplocia aequatorialis gen n. sp. nov.: 1, 2 and 3—Head and thorax of mature male and two female nymphs; 4—Detail of foreleg, showing tibial (ptb) and tarsal (pta) projections; 5—Male abdomen, with subimago terminalia; 6 and 7—Developing male penes (photograph and drawing).

FIGURES 8–16. Dasyplocia aequatorialis gen n. sp. nov.: 8—Labrum, dorsal view; 9—Hypopharynx, ventral view; 10—Detail of left mandible: inner and outer incisors and prostheca; 11—Detail of right mandible: inner and outer incisors; 12—Labium, ventral view (left) and dorsal view (right); 13—Maxilla; 14—Detail of apex of 3rd segment of maxilla; 15—Apex of protonal flanges and apical spine of prothorax; 16—Gill I.