Cloeonini Newman 1853

Kluge, Nikita J., 2016, A new subgenus Oculogaster subgen. n. for viviparous representatives of Procloeon s. l., with discussion about status of the generic name Austrocloeon Barnard 1932 and the species name africanum Esben-Petersen 1913 [Cloeon] (Ephemeroptera, Baetidae), Zootaxa 4107 (4), pp. 491-516 : 492-493

Tribe Cloeonini Newman 1853

Branch “6”: Kluge & Novikova 1992: Fig. 11

Hierarchical name: Cloeon /fg1: Kluge 2011: 362

Diagnosis. Larva. Labial palp with 3rd segment truncate and 2nd segment non-widened. Patella-tibial suture equally developed on all legs, often interrupted on outer side and continued by row of fine setae ( Figs 20 , 56 ; Kluge & Novikova 1992: Fig. 1 : 1, 2). Claws slightly bent, symmetric, either with two equal rows of denticles, or without denticles. At least abdominal segment IX with denticles on lateral sides. Tergalii able to rhythmical respiratory movements. Tergalii without anal rib, anal margin with or without flap forming additional dorsal lamella.

Pose of developing subimaginal gonostyli in mature larva of the « Cloeon - type », i.e. with 2nd segments directed laterally and 3rd segments bent medially ( Kluge & Novikova 1992: Fig. 5 ).

Winged stages. Fore wing with no more than one intercalary vein in each space. Hind wing either absent, or of the « Centroptilum - type », i.e. narrow, with 2 longitudinal veins and always with hooked costal process. Postsubalar sclerite (well visible on subimaginal exuviae) has posterior-dorsal process narrow, with concave dorsal margin ( Fig. 37 ). Subimaginal tarsi of all legs covered by pointed microlepides, without blunt microlepides. In male imago apices of gonovectes fused with penial bridge; penial bridge medially with unpaired sclerotized projection ( Figs 30 , 65 ). Gonostyli with 2nd segment widened apically, 3rd (terminal) segment small and petiolate ( Figs 30 , 65 ).

Composition. Includes genera Cloeon , Similicloeon , Pseudocentroptilum and Procloeon .

Figures

FIGURES 11 – 20. Procloeon (Oculogaster) cylindroculum, larva. 11 – 17, tergalii of I – VII pairs (specimen from Zambia); 18, frontal suture; 19, claw; 20, fore leg, anterior view (fine setae not shown; dots show bases of fine setae forming regular rows on apical part of femur, proximal part of tibia and proximal part of tarsus).

FIGURES 49 – 58. Procloeon (Oculogaster) album sp. n., larva. 49 – 55, tergalii I – VII; 56, fore leg, anterior view (fine setae not shown; dots show bases of fine setae forming regular rows on apical part of femur, proximal part of tibia and proximal part of tarsus); 57, claw; 58, paraproct (49 – 52, 54 – 55, 58, holotype).

FIGURES 1 – 10. Procloeon (Oculogaster) cylindroculum, larva. 1 – 7, tergalii of I – VII pairs (specimen from Uganda); 8, 9, apices of left and right mandibles, dorsal view; 10, apex of right mandible, apical view. Abbreviations: in 1, in 2, in 3, in 4, denticles of incisor; in-V, ventral denticle of incisor; kd 1, kd 2, kd 3, denticles of kinetodontium.

FIGURES 33 – 37. Procloeon (Oculogaster) cylindroculum. 33, 34, male imagoes; 35, subimaginal abdomen extracted from mature male larva; 36, subimaginal abdomen extracted from mature female larva; 37, subimaginal exuviae of postsubalar sclerite and lateropostnotal crest (33, 35 – 37, specimens from Zambia; 34, specimen from Uganda).

FIGURES 30 – 32. Procloeon (Oculogaster) cylindroculum from Zambia. 30, genitals of male imago (at left half gonovectal muscles shown by interrupted lines, hidden part of penis shown by interrupted line and dotted, gonostylar muscle not shown; at right half gonostylar muscle shown by interrupted lines, gonovectal muscles not shown; median styligeral muscle shown by interrupted lines, areas of anterior attachment of median paraproctal muscles shown by dotted lines). 31, exuviae of subimaginal genitals; 32, wing. Abbreviations: 1, 2, 3, segments of gonostylus; mIX-X, areas of anterior attachment of median paraproctal muscles (i. e., muscles going from sternum IX to common base of paraprocts); usg, unistyliger.

FIGURES 65 – 67. Procloeon (Oculogaster) album sp. n. 65, genitals of male imago (at left half gonovectal muscles shown by interrupted lines, hidden part of penis shown by interrupted line and dotted, gonostylar muscle not shown; at right half gonostylar muscle shown by interrupted lines, gonovectal muscles not shown; median styligeral muscle shown by interrupted lines, areas of anterior attachment of median paraproctal muscles shown by dotted lines). 66, genitals of male subimago; 67, wing. Abbreviations: 1, 2, 3, segments of gonostylus; mIX-X, areas of anterior attachment of median paraproctal muscles (i. e., muscles going from sternum IX to common base of paraprocts); usg, unistyliger.