Centroptella ingridae, Kluge & Godunko & Svitok, 2020

Kluge, Nikita J., Godunko, Roman J. & Svitok, Marek, 2020, Nomenclatural changes in Centroptella Braasch & Soldan, 1980 (Ephemeroptera, Baetidae), ZooKeys 914, pp. 81-125 : 81

publication ID	https://dx.doi.org/10.3897/zookeys.914.46652
publication LSID	lsid:zoobank.org:pub:91B11F13-EF55-4E71-B0D6-4491942912DC
persistent identifier	https://treatment.plazi.org/id/0D1B2BEB-824D-4881-B219-29635BBB5C1D
taxon LSID	lsid:zoobank.org:act:0D1B2BEB-824D-4881-B219-29635BBB5C1D
treatment provided by	ZooKeys by Pensoft
scientific name	Centroptella ingridae
status	sp. nov.

Treatment

Centroptella ingridae sp. nov. Figures 33-39 View Figures 19–39 , 83-89 View Figures 83–89 , 90-93 View Figures 90–93 , 94-109 View Figures 94–109 , 110-115 View Figures 110–115 , 116-122 View Figures 116–122 , 123-128 View Figures 123–128 , 129-132 View Figures 129–132 , 133-137 View Figures 133–137 , 138-143 View Figures 138–143 , 144-148 View Figures 144–148 , 149 View Figures 149–152

Chopralla sp.: Waltz and McCafferty 1987a: 183 (larva in list of material examined)

Centroptella liebenauae : Soldán et al. 1987: 342 (partim: larva, non imago)

Bungona (Chopralla) liebenauae : Salles et al. 2016: 104, fig. 6D (larva), Appendix S3 (partim: larval characters 0-19 and 31-121); Sroka et al. 2019: fig. 6B (larva); Shi and Tong 2019: 582, figs 60-67 (larva)

Material examined.

Holotype: L-S-I♂ {specimen [XV](1)2015}, THAILAND, Mae-Hong-Son Province, Pai, Mhor-Phaeng Falls, 11.II.2015, coll. N. Kluge & L. Sheyko (ZIN). Paratypes: the same locality and collectors, 9-11.II.2015: 1 L-S♂, 2 L-S-I♀, 2 L/S♂, 6 larvae (ZIN); Pai, 19-25.XI.2010, coll. K. Tomkovich: 1 I♂ (ZIN). VIETNAM, Vinn Phu Prov., Suoi Bac Stream, Tam-Dao, 10-16.10.1984 T. Soldán: 47 larvae (paratypes of Centroptella liebenauae , including the specimen wrongly labeled as “holotype”, see above) (deposited in Institute of Entomology, BC CAS, České Budějovice).

Etymology.

This species is named in honour of Ingrid Müller-Liebenau.

Descriptions.

Larva. Cuticular coloration. Frontal side of head colourless (Fig. 86 View Figures 83–89 ). Pronotum and mesonotum with contrasting brown, ochre and/or colourless areas, forming characteristic pattern (Figs 83-85 View Figures 83–89 ). Thoracic pleura and metanotum partly brown, partly colourless; sterna colourless (Fig. 89 View Figures 83–89 ). Each leg with coxa and trochanter colourless; femur either entirely colourless, or with diffuse brown macula in distal part on posterior and/or anterior surfaces; tibia and tarsus with more or less expressed diffuse brown coloration, mainly on outer side; claws brownish (Fig. 89 View Figures 83–89 ). Abdominal terga with contrasting brown, ochre and/or colourless, areas forming characteristic pattern; most terga with large, paired, transverse blanks, which occupy medioposterior sigilla and stretch laterally from them (Figs 83-85 View Figures 83–89 ). Caudalii colourless at base, diffusely darkened at middle (Fig. 85 View Figures 83–89 ).

Shape and setation. Frontal suture short, nearly semicircular (as in Fig. 55 View Figures 53–59 ). Labrum equally wide at base and middle, with pair of submedian, long setae, 2-3 pairs of sublateral, long setae and pair of long setae between submedian and sublateral ones (Fig. 116 View Figures 116–122 ). Prostheca of left mandible with 3 blunt processes and 2-4 pointed processes (Fig. 144 View Figures 144–148 ). Prostheca of right mandible directed medially-distally, with short, apical denticles and without long branch; median margin of right mandible proximad of prostheca either without processes, or with small seta-like processes (Fig. 145 View Figures 144–148 ). Maxillary canines and distal dentiseta stout; distal dentiseta widened, with apex somewhat hooked toward canines (as in Fig. 42 View Figures 40–48 ). Maxillary palp nearly as long as lacinia, 2-segmented. Labium with glossae and paraglossae subequal, both narrowed apically (Fig. 124 View Figures 123–128 ). Glossa ventrally with irregularly arranged setae in proximal part and about 10 setae forming ventro-median row. Paraglossa with latero-apical setae forming one regular row and few setae just dorsad of it; with about 8 setae in ventro-median row; with 4 setae in dorso-median row. Distal segment of labial palp rounded apically (Fig. 123 View Figures 123–128 ).

Pronotum with pair of protuberances near posterior margin (Figs 87 View Figures 83–89 , 88 View Figures 83–89 , 111 View Figures 110–115 ; the same character listed by Shi and Tong 2019: 583, figs 62, 63 under species name C. liebenauae ). Metanotum with vestiges of hind protoptera (as in Fig. 54 View Figures 53–59 ). Forelegs longest, hind legs shortest; on all legs, tarsus (measured on outer side) longer than tibia; in holotype length of femur / tibia / tarsus / claw of foreleg (mm) 0.88: 0.48: 0.57: 0.16; on middle leg 0.83: 0.42: 0.48: 0.16; on hind leg 0.80: 0.39: 0.43: 0.16. Femur parallel-sided; outer margin straight or slightly concave, apically either rounded (Figs 90-92 View Figures 90–93 ), or with blunt-angled projection bearing two subapical setae; inner margin slightly convex. Outer side of femur with regular or irregular row of 9-11 long, blunt setae and 2 subapical setae of same form (Figs 90-92 View Figures 90–93 ). Inner-dorsal side of forefemur with few stout setae, length of these setae being half that of setae on dorsal side. Foreleg without patella-tibial suture, middle and hind legs with patella-tibial suture greatly shifted to apex of tibia. Posterior arm of U-shaped row of long setae on fore- and middle leg situated across tibia (Figs 90-91 View Figures 90–93 ); on hind leg longitudinal (Fig. 92 View Figures 90–93 ). Inner margin of tibia and tarsus with irregular, small, stout, pointed setae. Outer-apical seta of tibia blunt and elongate (Figs 90-92 View Figures 90–93 ). Dorsal side of each tarsus with long, fine setae situated irregularly and partly forming two longitudinal rows. Claw either with two rows of denticles (Fig. 127 View Figures 123–128 ) or with their vestiges (Fig. 126 View Figures 123–128 ).

Scales on abdominal terga and sterna numerous, elongate, varying in size and shape, bordered by brown (Figs 94 View Figures 94–109 - 122 View Figures 116–122 ). Posterior margin of abdominal tergum I smooth, without denticles (Fig. 94 View Figures 94–109 ); posterior margins of terga II-VI with short semicircular and triangular denticles (Figs 95-99 View Figures 94–109 ); terga VII-IX with longer triangular denticles (Figs 100-102 View Figures 94–109 ); on tergum IX middle part of hind margin behind pair of submedian setae lack denticles and projected posteriorly (Fig. 102 View Figures 94–109 ). Posterior margin of tergum X without denticles on median part, laterally with paired groups of several denticles, decreasing in length in lateral direction (Fig. 93 View Figures 90–93 ). Posterior margins of abdominal sterna I-IV smooth (Fig. 103 View Figures 94–109 ); posterior margins of sterna V-VIII with regular, small, pointed, triangular denticles (Figs 104-107 View Figures 94–109 ). Posterior margin of sternum IX in female convex, with row of triangular denticles diminished medially (Fig. 109 View Figures 94–109 ), in male without denticles between protogonostyli, but with several denticles at sides (Figs 108 View Figures 94–109 , 148 View Figures 144–148 ). Each sternum IV-VI with pair of regular, transverse rows of long, fine, bifurcate setae with spaced sockets (Figs 117-119 View Figures 116–122 ); other sterna either without such setae, or with few, smaller setae irregularly situated. Paraprocts with small, anterior, median apodeme, with few large pointed denticles on posterior margin, with scales as on sterna and terga (Figs 93 View Figures 90–93 , 120-121 View Figures 116–122 ). Tergalius I narrow, elongate-ellipsoid; other tergalii wider, gradually changing in shape from tergalius II to tergalius VII (Figs 33-39 View Figures 19–39 ). Each tergalius II-VII, besides costal and anal ribs, with straight and narrow middle rib, located on dorsal surface on background of main trachea (Fig. 125 View Figures 123–128 ). Costal margin with poorly expressed serration; anal margin without serration; outer margin free of ribs, slightly notched, with small seta in each notch. In middle part of cercus, lateral side with 2 long, pointed denticles on every 4th segment (Figs 129-130 View Figures 129–132 ). Each cercus, besides regular row of primary swimming setae on inner side (Fig. 132 View Figures 129–132 ), with smaller and thinner secondary swimming setae on outer margin; on distal half of cercus, secondary swimming setae with wide, transverse, oval bases, forming regular row (Figs 129-131 View Figures 129–132 ); on proximal half of cercus, secondary swimming setae with small, round bases and situated irregularly (Figs 129-130 View Figures 129–132 ).

Male genitalia. In last larval instar, developing subimaginal gonostyli folded under larval cuticle in peculiar pose, with 3rd segments bent medially-proximally (Fig. 148 View Figures 144–148 ).

Subimago. Cuticle light brown with darker brown sutures of thorax; hypodermal coloration as in imago. On all legs of male and female all tarsal segments entirely covered by pointed microlepides (Fig. 137 View Figures 133–137 ).

Imago, male. Head brown. Turbinate eyes relatively low and wide, with yellow stem and orange-red facetted surface (Fig. 135 View Figures 133–137 ). Thorax dark brown, with ochre pleural membranes (Fig. 135 View Figures 133–137 ). Wing (Fig. 149 View Figures 149–152 ) with membrane colourless, veins pale ochre or colourless, extreme base of costal and subcostal veins proximad of costal brace brown. Femora of all legs ochre, apically diffusely tinged with reddish; foretibia light ochre, apically darkened with light brownish; middle and hind tibiae ochre, with diffuse longitudinal stripe; tarsi of all legs pale ochre; claws brown (Fig. 136 View Figures 133–137 ). In holotype, length of femur, tibia and tarsal segments (mm) on foreleg 1.05: 1.13: 0.05: 0.55: 0.35: 0.19: 0.15, on middle leg 0.78: 0.62: 0.25: 0.09: 0.05: 014, on hind leg 0.74: 0.57: 0.21: 0.07: 0.04: 0.14. Tarsus of middle and hind leg with 1 apical spine on initial 3rd tarsomere (next after 1st+2nd tarsomere) (as in Fig. 137 View Figures 133–137 ). Abdominal tergum I colourless; terga II-VI colourless with narrow, contrasting, reddish stripe bordering posterior margin; terga VII-X red with ochre, with darker stripe bordering posterior margin; abdominal sterna colourless (Fig. 139 View Figures 138–143 ). Genitalia (Figs 140-143 View Figures 138–143 , 146 View Figures 144–148 ). Sterno-styligeral muscle entirely absent. Posterior margin of 9th abdominal sternum between unistyligers with narrow, trapezoid, membranous, colourless process (Figs 141 View Figures 138–143 , 146 View Figures 144–148 ). Gonostylus with 1st segment narrowed apically; 2nd segment thickened toward apex; 3rd segment elongate, narrow and thickened toward apex (Figs 142 View Figures 138–143 , 146 View Figures 144–148 ). Penial bridge medially sharply concave (Fig. 146 View Figures 144–148 ). Gonovectes apically with sclerotized widenings of peculiar halberd-like shape (Figs 141 View Figures 138–143 , 143 View Figures 138–143 ).

Imago, female. Head and thorax ochre with reddish markings (Figs 133-134 View Figures 133–137 ). Leg coloration as in male. Patella-tibial suture present on middle and hind legs, absent on forelegs (as in male). Tarsus of each leg with 1 apical spine on initial 3rd tarsomere (on foreleg - on tarsomere next after 2nd tarsomere, on middle and hind leg-on tarsomere next after 1st+2nd tarsomere) (as in Fig. 137 View Figures 133–137 ). Abdominal terga intensely coloured with ochre and reddish, partly repeating cuticular colour pattern of larva; abdominal sterna nearly colourless, sterna I-VI with pair of reddish maculae near antero-lateral corners (Fig. 138 View Figures 138–143 ).

Egg. Oval; chorion smooth, without relief (Fig. 128 View Figures 123–128 ).

Dimension.

Forewing length of male 4.7 mm; of female 5.0 mm.

Distribution.

Indochina: known from Thailand and Vietnam; recently reported from China (Yunnan, Guangxi, Guangdong) under the species name C. liebenauae ( Shi and Tong 2019).

Comparison.

Centroptella ingridae sp. nov. belongs to the inzingae - ingridae species group; male imagines of this group differ from all other Centroptella by halberd-like gonovectes and absence of the sterno-styligeral muscle (Fig. 146 View Figures 144–148 ). The male imago of Centroptella ingridae sp. nov. differs from other members of the inzingae - ingridae group by abdominal coloration (Figs 139 View Figures 138–143 ). The larva of Centroptella ingridae sp. nov. differs from all other Centroptella by the presence of a pair of projections on the pronotum (Fig. 111 View Figures 110–115 ).