Centroptella (Chopralla) kangi Kluge 2021, sp. n.
Creators: name: Kluge, Nikita J.
Publisher: name: Zenodo
Year: 2021
Subjects: Biodiversity
Taxonomy
Animalia
Arthropoda
Insecta
Ephemeroptera
Baetidae
Centroptella
Centroptella kangi

description: 3.6. Centroptella (Chopralla) kangi sp. n.
(Figs 632–672)
« Cloeodes Sabah -4» (unpublished label).
Etymology. The species in named in honor to S.C. Kang, whose material is used for the description.
Material examined. Holotype: L/S ♂: MALAYSIA, Negeri Sabah, Karagasan, Ranau, 4.IX.1994, coll. S.C. Kang. Paratypes: the same locality, date and collector: 1 L/S ♂, 1 L/S ♀, 1 L ♀. Other material (not examined): the same locality, date and collector: larvae in Entomological Institute, Česke Budejovice, Czech Republic).
Descriptions.
Larva. CUTICULAR CLORATION: Pronotum and mesonotum with brown, ochre and/or colorless areas (Fig. 633). Abdominal terga II–VI with medioanterior and medioposterior sigilla lighter than background, without contrasting transverse blanks; terga VII–VIII lighter than others (Fig. 632).
HYPODERMAL COLORATION: Unknown.
SHAPE: Labrum widest at base and narrowed distally (Fig. 659). Mandibles (Figs 655–658): incisor of left mandible terminated with 3 denticles, among which distal denticle much wider than two proximal ones; incisor of right mandible terminated with 2 denticles, among which distal denticle much wider than proximal one; left and right incisors with outer-ventral denticle (Fig. 656). Prostheca of left mandible with 3 blunt processes and 2–3 pointed processes; prostheca of right mandible directed medially or medially-proximally, arched proximally, without bifurcation (Fig. 657); median margin of right mandible proximad of prostheca with or without short seta-like processes. Maxillary palp nearly as long as lacinia, 2-segmented (Fig. 661).
Pronotum without protuberances (in contrast to C. ingridae). Vestiges of hind protoptera very small or absent. Legs longer than in other species (Figs 651–653), length of outer side of patella equal to tibia width (Figs 662–666); forelegs longest, hind legs shortest; on fore and middle legs tarsus (measured on outer side) as long as tibia; on hind legs tarsus slightly shorter than tibia. All femora parallel-sided, outer margin straight or slightly concave, inner margin slightly convex. Foreleg without patella-tibial suture, middle and hind legs with patella-tibial suture greatly shifted to apex of tibia (Figs 662–666) [see Centroptella s. l. (2)]. Claw with two rows of 0–3 denticles in each; selected claws with denticle(s) on one side or without denticles [see Chopralla (2)].
Denticles on posterior margins of abdominal terga and sterna flat (not conic). Terga I–IV without denticles; terga V–IX with triangular denticles, small and irregular on tergum V and long on posterior terga; on tergum IX row of denticles interrupted medially, behind pair of submedian setae (Fig. 667). Posterior projection of tergum X without denticles on median part, laterally with paired groups of 3–6 long or short denticles (Fig. 650). Sterna I–IV without denticles; sterna V–VIII with regular, small, pointed, triangular denticles (Fig. 668). Posterior margin of sternum IX in female convex, with row of triangular denticles diminished medially, in male without denticles between protogonostyli (as in Fig. 627). Paraprocts with thin and colorless antero- median apodeme, with large pointed denticles on posterior margin (Fig. 649).
Tergalius I narrow, elongate-ellipsoid; other tergalii wider, gradually changing in shape from tergalius II to tergalius VII; each tergalius II–VII, besides costal and anal ribs, with straight and narrow middle rib, located on dorsal surface on background of main trachea (Figs 635–648) (see Centroptella s. l.).
Enlarged denticles on outer side of cercus relatively large (reaching or exceeding midlength of next segment arranged), located on every 2nd or every 4th segment and arranged by 1–3 on each side of secondary swimming setal row [see Centroptella s. l. (3)] (Fig. 634).
SCALES: Scales on thoracic terga varying from short to band-like: certain areas of pronotum and mesonotum with colorless scales 2 mkm width and 5–15 mkm length (Fig. 669). Scales on abdominal terga numerous, elongateoval, with longitudinal striation, significantly wider than their sockets, widely overlapping one another (Fig. 667). Scales on most anterior abdominal terga, on abdominal sterna, metanotum and thoracic pleura smaller (Fig. 668).
STOUT SETAE: Row of long, clavate, setae on outer side of femur dense and irregular at proximal part, sparse and regular at distal part, consists of 9–13 setae and 2 subapical setae of same form (Figs 651–653). Tibia and tarsus with few very small stout setae on inner side (Fig. 662, 665). Outer-apical seta of tibia blunt and elongate (Figs 662–666).
LONG, FINE SETAE: Bifurcate setae of metasternum (i) (see Centroptella s. l.) form pair of dense, regular rows partly with contiguous sockets (as in Fig. 517). U-shaped row of long setae distanced from tibia-femur articulation; its posterior arm on fore- and middle legs situated across tibia (Figs 662–666); on hind leg longitudinal [see Chopralla (1)]. Dorsal side of each tarsus with long, fine setae situated irregularly and partly forming two longitudinal rows (as in Figs 562–563; see Centroptella s. l.). Tergum VII with pair of fine, bifurcate (Y-shaped) setae sublaterally (g) (as in Fig. 406). Each sternum IV–V with pair of regular, transverse rows of long, fine, bifurcate setae with spaced sockets (j); other sterna either without such setae, or with few setae irregularly situated.
MALE GENITALIA IN LARVA: In last larval instar, developing subimaginal gonostyli folded under larval cuticle in « Nigrobaetis - type » pose, with 2nd and 3rd segments directed caudally and inserted into previous ones (Fig. 654) [see Chopralla (5)].
Subimago. TEXTURE: On all legs of both sexes all tarsal segments entirely covered with pointed microlepides (as in Fig. 391).
Imago, male. Unknown. Judging by subimaginal leg developed under larval cuticle, tarsus of middle and hind legs with 1 apical spine on initial 3rd tarsomere (next after 1st+2nd tarsomere) (Figs 652–653); sterno-styligeral muscle present (Fig. 654) [see Chopralla (7)].
Imago, female. Unknown. Judging by subimaginal leg developing under larval cuticle, tarsus of fore leg without apical spines (as in males of this and other species); tarsi of middle and hind legs with 1 apical spine on initial 3rd tarsomere (next after 1st+2nd tarsomere).
Egg (Figs 670–672). Oval; chorion with sharply projected net-like relief. Micropile not found, probably located under ridge of net-like relief.
Dimension. Body length about 5 mm.
Distribution. Borneo.
Comparison. Larva of Centroptella (Chopralla) kangi sp. n. differs from other known species of Centroptella s. l. by longer tibia with the U-shaped row of long setae located fare from the femur-tibia articulation (Figs 561–563, 662–666). Winged females of C. kangi sp. n. differ from other examined species of Centroptella s. l. by absence of apical spines on fore tarsi.
description: Published as part of Kluge, Nikita J., 2021, Review of Centroptella Braasch & Soldán 1980 (Ephemeroptera, Baetidae), pp. 1-144 in Zootaxa 5054 (1) on pages 132-138, DOI: 10.11646/zootaxa.5054.1.1, http://zenodo.org/record/5577421