Campsurus decoloratus (Hagen)

Molineri, C., Salles, F. F. & Emmerich, D., 2015, Revision of Campsurus violaceus species group (Ephemeroptera: Polymitarcyidae) with new synonymies and nomina dubia in Campsurus Eaton, 1868, Zootaxa 3920 (1), pp. 51-68 : 65

Campsurus decoloratus (Hagen)

( Figs. 44−46 )

Palingenia decolorata Hagen 1861: 43 .

Campsurus decoloratus Eaton 1883 −1888: 41.

Material. Two female adults from USA: Texas, Montgomery Co., San Jacinto river at US 59, near Kingwood, 17.viii.1997, N. A. Wiersema col.

Distribution. Mexico, Nicaragua, USA (http://www.entm.purdue.edu/mayfly/).

Diagnosis. Campsurus decoloratus can be separated from the other species of the genus by the following combination of characters: 1) pedestals and penes similar to C. violaceus , with pedestals elongate with outer corner slightly projected and penes slender, except that "thumb" is finger-like (figures 22−23 of Traver 1947); 2) female socket with straight transverse opening and with an anterior longitudinal rib ( Figs. 45−46 ).

Female. Abdominal sternum VIII with a subquadrate single socket on the anteromedian area, the anterior furrow presents a thin medial rib ("r" in Fig. 46 ); in both female adults studied the groove (socket`s opening) appears obtruded by a subespherical aglutinated material ("?" in Fig. 46 ). The sternum VIII is completely covered by microtrichiae, except anteriorly and around the groove ( Figs. 45−46 ).

Eggs ( Fig. 44 ). Length, 188−237; width, 145−175. L/W ratio (N=5): 1.2−1.6. Hemispherical to ovate, with convex and concave sides as usual, capped pole broader, cap formed by>15 very long threads coiled around each other in a single stronger filament, chorionic surface covered by small punctures, except below the polar cap. Micropylar devices unknown.

Figures

FIGURES 41 − 46. Female sternum VIII and eggs. C. violaceus: 41, sternum VIII (s = socket); 42, detail of socket; 43, egg. C. decoloratus: 44, eggs; 45, sternum VIII; 46, detail of socket. Abbreviations: f = furrow; r = rib; s = socket.