Leptohyphes myllonotus Allen & Roback, 2020

Molineri, Carlos, 2020, Status changes in some species of Leptohyphes Eaton (Leptohyphidae, Ephemeroptera), Zootaxa 4885 (1), pp. 146-150 : 147

Leptohyphes myllonotus Allen & Roback stat. nov. ( Figs. 5–11 )

Leptohyphes myllonotus Allen & Roback 1969: 375 ; Molineri 2003: 63 (under L. maculatus )

Leptohyphes sp. 2 Roback 1966: 151

Material. Holotype slides from Peru, Porto Nuevo , 24.ix.1955, SS Roback col. Paratypes: 2 nymphs and 3 slides from Peru, Tulumayo river , 24.ix.1955, SS Roback col. All the material in ANSP .

Molineri (2003) treated L. myllonotus as a junior synonym of L. maculatus Allen (1967) , in spite of a number of characters that are now known to be important and differentiate both species, such as: the presence of very well-developed lateral pronotal protuberances in L. myllonotus ( Fig. 9 ), that are completely absent in L. maculatus , and the absence of spine-like setae on the fore (leading or flexor) margin of femora in L. myllonotus ( Figs. 5–7, 10–11 ), while L. maculatus show a row of small spines along this margin. Drawings of holotype and paratype slides of L. myllonotus are presented since they show some small differences.

The following combination of characteristics is useful to separate L. myllonotus from all other species in the genus: 1) occiput with netted grayish pattern ( Fig. 9 ); 2) pronotum with well–developed rounded lateral projections ( Fig. 9 ); 3) femora expanded and somewhat rounded in outline, fore margin without spines (only with thin setae) and without apical concavity, hind margin with 19–25 stout spines mounted on elevated sockets, dorsal face without spines ( Figs. 5–7, 10–11 ); 4) fore and hind femora relatively stout and robust (ratio length/maximum width 1.7; 5) fore femur relatively small in relation to hind femur (ratio length hind/fore femur = 1.7); 6) hind tibia relatively large (ratio length hind femur/ hind tibia 0.9); 7) tarsal claw denticulation 4 + 0; 8) forewing buds whitish with blackish veins ( Fig. 9 ); 9) hind wing pads absent in female. These features indicate that L. myllonotus is closer to L. petersi and related species ( L. liniti , L. alleni , L. murdochi ) than to any other in the genus. The absence of apical concavity in fore margin and the absence of spines in the dorsal face of hind femur differentiate this species from L. petersi , otherwise both are rather similar.

Figures

FIGURES 5–11. Leptohyphes myllonotus. Holotype: 5, foreleg (dv); 6, middle leg (dv); 7, hind leg (dv); 8, posterior margin (part) of abdominal tergum VII. Paratype: 9, head and thorax (dv); 10, foreleg (dv); 11, hind leg (dv).