Procloeon ( Psammonella ) diplofolium, Kluge, 2025

Procloeon ( Psammonella) diplofolium sp. nov.

( Figs 27–28 View FIGURES 25–28 , 46–52 View FIGURES 32–59 , 110–135 View FIGURES 110–116 View FIGURES 117–122 View FIGURES 123–131 View FIGURES 132–135 )

Material examined. Holotype: L-S ♀ {specimen [XIII] (6)B 2015}, THAILAND, prov. Mae-Hong-Son, Pai , river Pai upstream Tan Jet Ton village, 9.II.2015, coll. N. Kluge & L. Sheyko. Paratypes: the same locality and collectors, 5–14.II.2015: 2 L-S ♀, 30 larvae .

Etymology. The species name diplofolium refers to double tergalii of some anterior pairs ( Figs 46–49 View FIGURES 32–59 ). While this character occurs in many other representatives of the genus Procloeon , it is unknown for other representatives of the subgenus Psammonella .

Larva. CUTICULAR COLORATION. Head mostly colorless, only frons dorsad of antennae bases and occipit colored with light ochre ( Fig. 111 View FIGURES 110–116 ). Pronotum and mesonotum ochre, with small, contrasting darker brown maculae ( Fig. 112 View FIGURES 110–116 ). Metanotum and thoracic pleura with brown and colorless areas ( Fig. 113 View FIGURES 110–116 ). Legs mostly colorless ( Figs 114–116 View FIGURES 110–116 ). Abdominal terga with darker brown and lighter ochre areas; terga I, III, V–VI and IX darker than others ( Fig. 110 View FIGURES 110–116 ). Sterna colorless. Caudalii light ochre, with darker brownish margin of each 4th segment; swimming setae with light bases, darker brownish middle parts and colorless tips ( Fig. 110 View FIGURES 110–116 ).

HYPODERMAL COLORATION. Abdominal terga with transverse reddish band at middle part of posterior margin; these or that abdominal terga with or without other unpaired and/or paired reddish markings ( Fig. 134 View FIGURES 132–135 ).

SHAPE AND SETATION. Labrum widened distally, with distal margin sharply concave ( Fig. 117 View FIGURES 117–122 ). Mandibles with incisor and kinetodontium separated up to base ( Figs 121–122 View FIGURES 117–122 ). Maxilla modified as characteristic for Psammonella ( Figs 27–28 View FIGURES 25–28 , 120 View FIGURES 117–122 ). Maxillary palp with 3rd (terminal) segment as long as 2nd segment ( Fig. 120 View FIGURES 117–122 ). Hypopharynx with 3 apices ( Fig. 118 View FIGURES 117–122 ). Glossae short and wide, rounded apically; paraglossae longer and narrower than glossae, arched, parallel-sided ( Fig. 119 View FIGURES 117–122 ). 3rd (distal) segment of labial palp with inner angle stretched and distal margin concave ( Fig. 119 View FIGURES 117–122 ).

Hind protoptera completely absent ( Fig. 113 View FIGURES 110–116 ). Legs with thin, rather long, pointed, stout, two-channel setae located on inner sides of femur, tibia and tarsus; no stout setae on outer side of leg ( Fig. 131 View FIGURES 123–131 ). Claws long and slender, without denticles ( Figs 114–116 View FIGURES 110–116 .

Abdominal segments II–VII with pair of posterolateral denticles; segments VII–IX with several denticles on lateral sides. Posterior margin of abdominal tergum I with small, irregular denticles; that of terga II–X with pointed denticles alternated with small denticles or blunt protuberances ( Fig. 123, 128 View FIGURES 123–131 ). Posterior margins of abdominal sterna I–III without denticles; that of sterna IV–IX with pointed denticles shorter than denticles on terga ( Fig. 124 View FIGURES 123–131 ). Paraprocts with long, pointed denticles ( Fig. 125 View FIGURES 123–131 ). Sterna II–VIII with one or few colorless, bifurcate setae sublaterally (as on Fig. 182 View FIGURES 181–189 ).

Tergalii I–IV with small dorsal lamella; tergalius VII stretched posteriorly, of usual Procloeon - type ( Figs 46– 52 View FIGURES 32–59 ).

In middle part of cerci and paracercus, denticles on posterior margin of each 4th segment equally enlarged on dorsal and ventral sides ( Figs 126–127 View FIGURES 123–131 ). In distal part of cercus, greatly enlarged denticle on lateral side of each cercomere (peculiar for Procloeon ) widened at midlength and slightly longer than cercomere ( Figs 129–130 View FIGURES 123–131 ).

POSE OF SUBIMAGINAL GONOSTYLI UNDER LARVAL CUTICLE of « Cloeon - type » (as in Fig. 94 View FIGURES 94–97 ) .

Subimago (based on reared females and males extracted from larva). CUTICULAR COLORATION. Subimaginal cuticle mostly colorless; mesonotum with pair of brown stripes along lateroparapsidal sutures ( Fig. 132 View FIGURES 132–135 ). Wing membrane entirely colorless, microtrichia ochre.

HYPODERMAL COLORATION. Body ochre; all or some abdominal terga with more or less expressed transverse reddish band at middle part of posterior margin, sometimes with other reddish markings ( Figs 134–135 View FIGURES 132–135 ). Legs uniformly ochre ( Fig. 133 View FIGURES 132–135 ).

TEXTURE. In both sexes, on all leg pairs, all tarsomeres are covered with pointed microlepides (as in Figs 98–99 View FIGURES 98–102 ) (Kluge 2022).

Imago. Unknown.

Eggs. Unknown. Eggs extracted from female subimagines are undeveloped.

Comparison. Larva of the new species Procloeon ( Psammonella) diplofolium sp. nov. differs from all other known Psammonella by presence of dorsal lamella on tergalii of some pairs and by rounded glossae.