Potamocloeon

Gat, J. - L., 2003, The genera Demoulinia Gillies and Potamocloeon Gillies (Ephemeroptera: Baetidae) in Madagascar, Zootaxa 184, pp. 1-18 : 7-9

2.1 Potamocloeon spA

Female larva

Maximal length: Body 5.6 mm. Cerci and median caudal broken.

Head. Uniformly yellow cream; antennae yellow cream.

Dorsal surface of the labrum ( Fig. 13 ) with a few long fine setae scattered over surface; distal margin with two kinds of setae: six outer long, pointed and simple setae and the 9 inner bifid setae, except the central seta feathered.

Hypopharynx ( Fig. 14 ) with a broad trilobate superlingua, covered with minute setae, thicker on the median lobe; lingua apically with long thin setae.

Right mandible ( Fig. 15 ) with two clearly separated sets of incisors, outer set with 3 denticles and inner with 2 denticles; edentate prostheca; tuft of abundant short setae between prostheca and mola; tuft of setae at the apex of the mola present; basal half without setae.

Left mandible ( Fig. 16 ) with 2 sets of incisors, outer and inner sets with 3 denticles; prostheca elongated with 4 thin teeth; tuft of small setae between prostheca and mola; tuft of setae at the apex of the mola absent; basal half without setae.

Maxillae ( Fig. 17 ) with 4 long teeth, none of them opposed to the others; 1 row of thin setae as long as the teeth and 3 spine­like setae; absence of setae at the base of the crown; row of 4 long stout setae at base of galea; 1 stout seta perpendicular to margin of galea; palp 2­segmented, much longer than galealacinia, segment 1 approximately 1.2x length of segment 2.

Labium ( Fig.18 ), glossae with an arc of thin setae; margin of paraglossae with long stout setae row of long stout setae subparallel to the inner margin. Labial palp 2­segmented, segment 1 almost bare; segment 2 with a triangular extremely developed lateral projection, apex ending with a recurved point; inner and distal margins with long stout setae.

Thorax. Yellow cream with brown median symmetrical lines on pro­ meso and metanotum.

Hindwing pads absent.

Legs yellow cream, slender with the dorsal and ventral margins parallel ( Fig. 20 ).

Ventral margin of femora with minute setae, dorsal and lateral margins bare.

Tibiae bare except a subproximal arc of setae ( Fig. 21 ).

Tarsi with only minute setae on ventral margin; tarsal claws elongated, about 0.9 times length of tarsi, edentate, subapical setae absent.

Abdomen. Terga 1, 3 to 9 yellow cream with a central and two lateral brown spots, darker on terga 3, 6 and 7; terga 3 to 5 with three median brown specks distally; tergum 2 yellow with a brown broad W­shaped pattern; tergum 10 uniformly yellow cream except distal margin dark brown ( Fig. 19 ).

Sterna uniformly yellow cream, except sterna 7 and 8 with laterally a brown longitudinal stripe.

Lateral margins of segments 4 to 9 with respectively 2, 2, 4, 6, 8 and 7 spines (spine at posterior angle excluded from count).

Gills 1 to 4 double ( Fig. 22 ), gills 5 to 7 simple ( Fig. 23 ), broad, strongly asymmetrical, not serrated and without setae on the margin; gill 7 broader and larger than the others.

Imagos

Unknown.

Material examined

One female larva MD053, Madagascar, Mandrare bas., Mandrare riv., Loc. Ifotaka, Alt. 60 m, 31.08.2001. Gerecke, R. and Goldschmidt, T.

Figures

FIGURE 18. Larval structures of Potamocloeon spA: 18: labium (left: ventral; right: dorsal).

FIGURES 13 ­ 17. Larval structures of Potamocloeon spA: 13: labrum (left: ventral; right: dorsal). 14: hypopharynx. 15: right mandible, ventral. 16: left mandible, ventral. 17: right maxilla.

FIGURES 19 ­ 23. Larval structures of Potamocloeon spA: 19: in toto (dorsal view). 20: foreleg. 21: proximal part of tibia. 22: third gill. 23: seventh gill.