CLADOENDESIS OF EPHEMEROPTERA

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Characters of Indocloeon/g2 of unclear phylogenetic status. 

Larva:

(1) Labrum with 2 paired setae between submedian setae and submarginal arc of setae (Kluge & Suttinun 2020: Fig.6; Müller-Liebenau 1982: Fig.1a).

(2) Incisor of left and right mandibles terminated by 3 denticles, 2nd denticle longest (Kluge & Suttinun 2020: Fig.1–2; Müller-Liebenau 1982: Fig.1h).

(3) Left mandible without setae proximad of prostheca (Kluge & Suttinun 2020: Fig.1; Müller-Liebenau 1982: Fig.1h).

(4) Mola of left mandible with seta(e) on proximal angle (as well as on right mandible) (Kluge & Suttinun 2020: Fig.1; Müller-Liebenau 1982: Fig.1h).

(5) Maxillary palp [3-segmented – see Indocloeon/g1 ()] consists of 2 subequally long segments and very short 3rd segment (Kluge & Suttinun 2020: Fig.5; Müller-Liebenau 1982: Fig.1e).

(6) Paraglossae gradually narrowed from base to apex (Kluge & Suttinun 2020: Fig.3–4); dorso-median setal row consists of 2 (occasionally 3) stout setae (Kluge & Suttinun 2020: Fig.8; Müller-Liebenau 1982: Fig.1b).

(7) Labial palp with a sharp point on apico-median projection of 2nd segment [see Indocloeon/g1 (6)] (Kluge & Suttinun 2020: Fig.3–4, Fig.7; Müller-Liebenau 1982: Fig.1b–c); exuviae of this segment is often crumpled longitudinally, with point retaining its shape.

(8) Larval tibiae of middle and hind legs have the same setation as tibia of fore leg: with one stout outer-apical seta (occasionally 2 or more such setae), without other stout setae on outer margin (Kluge & Suttinun 2020: Fig.14) (see Index of characters [1.2.17]).

Imago and subimago: 

(9) Antenna: scapus without hypodermal pigmented spots; proximal part of pedicellus with hypodermal pigmented spots on lateral and median sides (Kluge & Suttinun 2020: Fig.35). 

(10) First abdominal segment without lateral dots ventrad of metathoracic postnotum (Kluge & Suttinun 2020: Fig.41, 45). 

(11) Each abdominal tergum II–VI with transverse brown or reddish stripe on posterior margin (Kluge & Suttinun 2020: Fig.36–39, 41, 42–45).

Subimaginal cuticle: 

(12) Postsubalar sclerite with postero-dorsal angle stretched to a long projection (Kluge 2012: Fig.34).

Genitals of male imago: 

(13) Styliger with sharply outlined median impression (Kluge & Suttinun 2020: Fig.46; Kluge 2012: Fig.32). 

(14) Gonovectes without movably articulated distal portions (Kluge & Suttinun 2020: Fig.46; Kluge 2012: Fig.32).

Egg: 

(15) One polar area (about ¼ of egg length) with net-like relief; remainder surface with sharply outlined cavities (Kluge & Suttinun 2020: Fig.50–52, 53–55).