Indocloeon (Indocloeon) primum Müller-Liebenau 1982

Kluge, Nikita J. & Suttinun, Chanaporn, 2020, Review of the Oriental genus Indocloeon Müller-Liebenau 1982 (Ephemeroptera: Baetidae) with descriptions of two new species, Zootaxa 4779 (4), pp. 451-484 : 455-456

Indocloeon (Indocloeon) primum Müller-Liebenau 1982

( Figs 4–5 , 15–24 , 35–39 , 48–49 , 50–52 )

Indocloeon primum Müller-Liebenau 1982: 127 (larva); Kluge 2012: 367 (larva, subimago, ♂ and ♀ imagines, egg).

Material examined ( ZIN). SRI LANKA: Uva Province, Badulla District , Haputale, small stream in tea plantation ,

running from Haputale Forest , 6°46’N, 80°57’E, 15–23.I.2011, coll. N. Kluge & L. Sheyko: 19 L-S-I ♂ , 12 L-S-I ♀, 3 L-S ♂, 3 L-S ♀, 128 larvae; Central Province, Matale District, Sigiriya , 28–30.I.2011: 1 S-I ♂ ; Central Province, Nuwara Elya District, Dalhausie, very small stream close to guesthouse «Green House» near beginning of steps to Sri Pada ( Adam’s Peak ), 6°49’27”N 80°31’13”E, 24–26.I.2011, coll. N. Kluge & L. Sheyko: 3 L-S-I ♀ , 1 S-I ♂, 1 S-I ♀, 6 larvae; Delhausie, river Seethagangula close to guesthouse «Vegetable Garden», 6°49’34”N 80°31’29”E, 4–5.II.2020, coll. N. Kluge & L. Sheyko: 1 L-S ♀ .

Descriptions and notes. Larva. Labium with glossae, paraglossae and 2nd segment of labial palp relatively long ( Fig. 4 ). Stout setae on outer side of femur non-pectinate, apically blunt (as in Fig. 81 ). Apex of femur normally with 2 (occasionally up to 8) stout, blunt setae. Tibiae of fore, middle and hind legs normally with one stout outerapical seta (occasionally with 2 or more such setae), without other stout setae on outer margin (as in Figs 13–14 ) [see Indocloeon s. str. (8)]. Claw with 2 rows of denticles; in each row 2–7 (usually 3–4) most distal denticles larger than others. Hind margin of tergum I either lacks denticles or with few small denticles ( Fig. 15 ); hind margin of each tergum II–VIII bears regular row of long denticles fused at most part of their length ( Figs 16–18 ); denticles on posterior margin of tergum IX also fused proximally; on middle of posterior margin of tergum IX (behind submedian pair of setae) denticles shorter ( Fig. 19 ); denticles on posterior margin of tergum X partly fused proximally ( Fig. 20 ). Hind margins of sterna I–II lack denticles; each sternum III–IX with fused denticles ( Fig. 22 ); on sternum IX of male fused denticles located only by sides of protogonostyli and between protogonostyli ( Kluge 2012: fig. 35). Scales on abdominal terga and sterna blunt, forming irregular transverse rows ( Figs 24 ). Each segment of cercus with regular row of equal short denticles, without elongated denticles ( Fig. 23 ). For other characters see diagnosis of Indocloeon s. str. above, diagnosis of Indocloeon s. l. ( Kluge 2012 and above) and former descriptions (Müller- Liebenau 1982; Kluge 2012).

Subimago and imago. Described by Kluge (2012). Statement that «pedicellus with basal half brown» is not quite correct, because only lateral and median sides of its basal half are brown ( Fig. 35 ) [see Indocloeon s. str. (9)]. In subimago of both sexes and in male imago cross veins colourless ( Fig. 37 ), only in female imago cross veins darkened ( Fig. 39 ). Abdominal terga III–VI of both sexes always without median longitudinal stripe ( Figs 36, 38 ). Proximal (1st+2nd) segment of gonostylus moderately widened at base; proximal 2/3 of its inner margin straight, at 2/3 length from base inner margin forms convex blunt angle ( Fig. 48 ). For other characters see diagnosis of Indocloeon s. str. above, diagnosis of Indocloeon s. l. ( Kluge 2012 and above) and former description ( Kluge 2012).

Egg. Oval, about 0.15 mm length. Polar area bearing net-like relief [see Indocloeon s. str. (15)] with cells small, lacking convexities on bottoms ( Fig. 52 ); remainder area of egg surface partly with sharply outlined cavities (see ibid.), partly smooth ( Figs 50–51 ).

Distribution: Sri Lanka.

Figures

FIGURES 1–5. Larvae of Indocloeon s. str. 1–3, Indocloeon (Indocloeon) secundum sp. n.: 1–2, left and right mandibles of holotype (arrow shows seta on proximal angle of left mola); 3, labium (focus on ventral side); 4–5, Indocloeon (Indocloeon) primum, labium and maxilla (focus on ventral side).

FIGURES 15–24. Larva of Indocloeon (Indocloeon) primum. 15–20, posterior margins of abdominal terga I, II, IV, VII, IX and X (black triangle shows median line on tergum IX); 21, abdominal tergum VI; 22, abdominal sternum III; 23, cercus; 24, scales on abdominal sternum, enlarged.

FIGURES 35–39. Imagines of Indocloeon (Indocloeon) primum. 35, antennae of female imago; 36, abdominal terga and sterna of male imago (genitals removed); 37, male imago; 38, abdominal terga and sterna of female imago; 39, female imago.

FIGURES 46–49. Male genitals of Indocloeon s. str. 46, imaginal genitals of Indocloeon (Indocloeon) secundum sp. n. (holotype) (1+2, proximal segment of gonostylus; 3, distal segment of gonostylus; m.d, dorsal muscle of penis; m.gs, gonostylar muscle; m.gv, gonovectal muscle; m.s., median sterno-styligeral muscle); 47, their subimaginal exuviae; 48, gonostylus of Indocloeon (Indocloeon) primum; 49, its subimaginal exuviae.

FIGURES 50–52. Egg of Indocloeon (Indocloeon) primum. 50, general view; 51–52, enlarged areas marked by frames on Fig. 50.

FIGURES 76–81. Larvae of Indocloeon (Hindocloeon) continentale sp. n. 76–77, tibiae of fore and hind legs; 78–79, fore and hind legs; 80, claw; 81, outer margin of femur (76–79, holotype).

FIGURES 10–14. Larva of Indocloeon (Indocloeon) secundum sp. n. (holotype). 10–11, claw; 12, two outer-apical setae on fore tibia; 13, tibia of fore leg; 14, tibia of middle leg.