Pseudopannota fusca Kluge & Novikova, 2016, sp. n.
Creators: name: Kluge, Nikita J.
name: Novikova, Eugenia A.
Publisher: name: Zenodo
Year: 2016
Subjects: Biodiversity
Taxonomy
Animalia
Arthropoda
Insecta
Ephemeroptera
Baetidae
Pseudopannota
Pseudopannota fusca

description: Pseudopannota fusca sp. n.   
(Figs 9, 10, 20, 23, 24, 91–112)  
 Etymology. The adjective " fusca " (brown) refers to nearly unicolor brown cuticle of larva.   
 Material examined. Holotype: L/SƋ, UGANDA, Kasese District, Kiburara, river Nyamagasan, 8– 13.VIII.2007, coll. N. Kluge. Paratypes: UGANDA, Kanungu District, river Munyaga below Bwindi National Park, 24.VII.2007, coll. N. Kluge: 2 L/S ♀, 10 larvae.   
  Descriptions. Larva.  CUTICULAR COLORATION. Dorsal side of head and thorax brown, either unicolor or with few diffusive lighter areas (Fig. 105). Cuticle of legs unicolor brown. Abdominal terga brown, either unicolor, or with diffusive lighter areas; sterna lighter, unicolor. Tergalii ocher or light brown (Figs 100–104). Caudalii unicolor light brown (Fig. 108).   
HYPODERMAL COLORATION. Absent; only in mature larva ready to molt to subimago, subimaginalimaginal coloration of abdominal terga can be visible through larval cuticle.  
 STRUCTURE. Body relatively slender. Frons between antennae bases flat and bordered by pair of ridges; frontal suture blunt-angled (as in Fig. 72). Distal margin of frons sharply projected above clypeus (as in P. camerunense).   
 Labrum (Fig. 91) with lateral margins roundish, with long setae; distal margin [soft, with numerous fine setae—see Pseudopannota (1)] with well-expressed median incision; inner side with paired row of spine-like setae, with asymmetric sclerite [see Pseudopannota (1)]. Incisor of left and right mandible represented by one twopointed denticle [see Pseudopannota (2)]; protuberance proximad of right prostheca blunt [see Pseudopannota (3)] (Figs 92–94). Maxilla as characterized above [see Pseudopannota (4, 5)] (Fig. 9).   
 Maxillary palp (Figs 9, 10) with primary first segment distinctly divided into two subsegments of subequal length and thickness, without dense setae, with muscle running from its base through both subsegments to base of second primary segment [see Pseudopannota (6)]. Each subsegment of primary first segment and primary second segment with smooth sclerotized cuticle on outer side and membranous cuticle on inner side. Second segment terminated by small conic portion.   
 Paraglossae larger than glossae, both glossae and paraglossae widened distally (Figs 95, 96). Glossa with regular row of long setae on inner margin (Fig. 96). Both glossae and paraglossae apically-ventrally with numerous irregularly situated long setae, apically-dorsally with row of larger setae (Fig. 96; as in Fig. 34). Glossa with 2–4 long setae on distal half of dorsal side; paraglossa with one long seta on distal half of dorsal side (Fig. 95). Distal segment of labial palp [formed by fusion of 2nd and 3rd primary segments—see Pseudopannota (8)] widest at middle; its inner-apical margin bears irregular row of setae; outer and ventral surfaces soft and densely covered with numerous irregularly situated soft colorless setae (Fig. 96).   
Mesonotum with antero-lateral corners projected anteriorly (Fig. 105). Fore protoptera not fused (Fig. 20). Vestiges of hind protoptera absent. Coxa of each leg with rounded or pointed lobe, subequal on legs of all pairs (Figs 111, 112). Fore femur thickest proximally, middle and hind femora parallel-sided. Outer margin of each femur with irregularly situated stout setae; besides it, distal part of anterior surface with few setae of the same structure: 2–3 on fore femur (Fig. 111), 1 on middle femur (Fig. 112), absent on hind femur. No structures resembling femoral patch of Baetofemorata. Tibiae and tarsi with few stout spine-like setae on inner side. Patellatibial suture equally developed on all legs. Each claw, besides apical hook, always with two diverging denticles, larger proximal one and smaller distal one (Figs 23, 24).  
Surface of abdominal terga and sterna with pointed denticles and scales in wide semicircular sockets; on anterior segments scales sparse (Fig. 106), on posterior segments dense (Fig. 107). Posterior margin each tergum I– X with regular short denticles (Figs 106, 107). Sterna I–VI with posterior margin entirely smooth, sterna VII and VIII with very small denticles on posterior margin, sternum IX with denticles on posterior margin. Paraprocts with many short marginal denticles (Fig. 108).  
Tergalii (Figs 100–104) elongate, with costal margin nearly straight and anal margin convex; margin entirely bordered by thin rib, densely or sparsely serrate; at distance from costal margin and parallel to it, locates wide additional rib projected dorsally. Surface of tergalius without scales; with pointed denticles (similar to denticles on surface of tergum) either on whole dorsal surface of tergalius, or only on dorsal surface of its additional rib; tracheae dense, either partly pigmented and visible, or entirely invisible. Tergalius I several times smaller than others (Fig. 100), tergalii II–VI subequal, tergalius VII smaller.  
Cerci nearly as long as body, paracercus twice shorter. Segments of cerci and paracercus with equally small triangular denticles on posterior margins (Fig. 108).  
  Subimago.  CUTICULAR COLORATION. Cuticle at most light brown, with lighter and darker areas (Figs 98, 99).   
TEXTURE. On fore leg of male 1st–4th tarsomeres covered by blunt microlepides, 5th tarsomere covered by pointed microlepides; on other legs of male and all legs of female all tarsomeres covered by pointed microlepides (see Table 2).  
  Imago, male.  Unknown. Judging by subimago extracted from mature larva, has following features. Turbinate eyes widened apically, orange. Hind wings absent. Legs unicolor ocher. Tarsus of middle and hind leg with 2 apical spines, on segments 1st+2nd and 3rd. Abdominal terga I–IV at most light ocher, with posterior margins and lateral areas darkened by violet-brown; each tergum V–IX at most violet-brown, with submedian sigilla forming pair of small round blanks; tergum X ocher; abdominal sterna medially light ocher, laterally darkened by violet-brown (Fig. 97). Cerci unicolor ocher.   
 Male genital structure and development. Shape of genitals unknown. Sterno-styligeral muscle completely absent. Protogonostyli of male larva represent very shallow convexities of posterior margin of abdominal sternum IX. In mature larva ready to molt to subimago, subimaginal gonostyli are packed under larval cuticle in « Labiobaetis -pose»: second segments directed medially and bent (Fig. 97).   
 Imago, female. Unknown. Judging by subimago extracted from mature larva, has following features. Tarsus of fore leg with 2 apical spines, on segments 2nd and 3rd; middle and hind legs as in male. All abdominal terga with uniform violet-brown coloration and submedian sigilla forming on pair of small round blanks (as terga V–IX in Fig. 97).   
 Eggs (Fig. 110). About 0.1 mm length. Shape irregular, with irregular craters.   
 Dimension. Length about 6 mm.   
 Comparison. Larva of the new species Pseudopannota fusca sp. n. resembles species formerly attributed to the subgenus Hemipannota, i.e. P. maculosum (Crass 1947), P. modesta Elouard & al. 1990 and P. camillae Gattolliat 2002: all of them have slender body, non-fused protoptera and similar shape of labium with last segment of labial palp widest at middle. Larva of P. f us c a sp. n. differs from P. maculosum and P. modesta by presence of only two denticles on claw; from P. camillae and P. modesta it differs by presence of vestigial first tergalii. Besides this, larva of P. f u s c a sp. n. differs from other species by structure of tergalii with prominent additional rib parallel to anterior margin. This prominent rib is homologous to flat sclerotized brown stripe on tergalii of P. macul osa (Fig. 109).
description: Published as part of Kluge, Nikita J. & Novikova, Eugenia A., 2016, New tribe Labiobaetini tribus n., redefinition of Pseudopannota Waltz & McCafferty 1987 and descriptions of new and little known species from Zambia and Uganda, pp. 1-43 in Zootaxa 4169 (1) on pages 28-32, DOI: 10.11646/zootaxa.4169.1.1, http://zenodo.org/record/267393