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

description: 3.4. Centroptella (Chopralla) papuanica sp. n.
(Figs 591–625)
Material examined. Holotype: L-S-I ♀ {specimen [IV](4)B}: INDONESIA, Papua, Jayapura, Waena, 13.VIII.2012, coll. N. Kluge & L. Sheyko. Paratypes: the same locality, 8–13.VIII.2012, coll. N. Kluge & L. Sheyko: 1 L-S-I ♀, 2 L/S ♂, 1 larva.
Descriptions.
Larva. CUTICULAR COLORATION: Head with anterior side mostly colorless; genae brown; dorsal side of head brown. Pronotum and mesonotum with diffusive darker and lighter brown areas (Fig. 599). Thoracic pleura and metanotum brown with lighter areas; sterna colorless. Legs with coxae partly colorless, partly brown; trochanteres colorless. All femora on outer side mostly colorless, with diffusive longitudinal darkening at midlength nearer outer margin; fore and middle femora with outer side brown and with large brown macula on posterior side; hind femur with outer side colorless, with brown longitudinal macula on posterior side near inner margin; tibia of each leg diffusively darkened with brown along rows of long, fine setae; tarsus of each leg brown proximally and along rows of long, fine setae; claws brown (Figs 611–613). Abdominal terga with diffusive darker and lighter brown areas; each tergum II–III and V–VI with pair of transverse blanks located posteriad-laterad of medioposterior sigilla and with smaller, more anterior pair of transverse blanks located laterad of medioanterior sigilla; on terga II and IV blanks occupy most part of tergum; terga VII–VIII mostly light, with posterior and/or anterior margins bordered by darker brown; terga IX–X mostly brown; medio-anterior and medioposterior sigilla lighter than background (Fig. 598). Caudalii light brownish (Fig. 617).
HYPODERMAL COLORATION: Reddish-brown stripe on posterior margin of metanotum and each abdominal tergum (as in winged stages— Fig. 620).
SHAPE: Labrum either equally wide at base and middle, or slightly wider at base (Fig. 604). Mandibles: incisor of left mandible terminated with 4 denticles decreasing from most distal to most proximal; incisor of right mandible terminated with 3 denticles of subequal width, without 4th denticle; left and right incisors with outer-ventral denticle; prostheca of left mandible with 3 blunt processes and 3 pointed processes; prostheca of right mandible directed medially-distally, pressed to kinetodontium, curved and dentate apically, without long branch; median margin of right mandible proximad of prostheca with or without short seta-like processes (Figs 607–608). Maxillary palp nearly as long as lacinia, 2-segmented, with 2nd much longer than 1st segment.
Pronotum without protuberances (in contrast to C. ingridae). Metanotum with vestiges of hind protoptera (in all 6 individuals examined). Forelegs longest, hind legs shortest; on fore leg tarsus (measured on outer side) as long as tibia; on middle and hind legs tarsus slightly shorter than tibia (Figs 611–613). 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 614–616) [see Centroptella s. l. (2)]. Claw with two rows of 1–4 denticles in each [see Chopralla (2)].
Denticles on posterior margins of abdominal terga and sterna flat (not conic). Terga I–IV without denticles; terga V–IX with long triangular denticles; on tergum IX row of denticles interrupted medially, behind pair of submedian setae (Fig. 606). Posterior projection of tergum X with small, irregular denticles on median part, laterally with paired groups of 2–5 long denticles (Fig. 610). Sterna I–IV without denticles; sterna V–VIII with regular, pointed, triangular denticles (Fig. 602). Posterior margin of sternum IX in female convex, with row of triangular denticles diminished medially (Fig. 603), in male without denticles between protogonostyli (Fig. 609). Paraprocts with thin and colorless antero- median apodeme, with large pointed denticles on posterior margin (Fig. 610).
Tergalius I narrow, elongate-ellipsoid; other tergalii wider, gradually changing in shape from tergalius II to tergalius VII (Figs 591–597). Each tergalius II–VII, besides costal and anal ribs, with straight and narrow middle rib, located on dorsal surface on background of main trachea (see Centroptella s. l.).
Enlarged denticles on outer side of cercus not large (reaching or not reaching midlength of next segment), located on every 2nd segment and arranged by 1–3 on each side of secondary swimming setal row [see Centroptella s. l. (3)] (Fig. 617).
SCALES: Scales on occipit, median parts of pronotum and mesonotum very small (with sockets 3–4 mkm and length 4–5 mkm) (Fig. 600). Lateral parts of pronotum, lateral parts of mesonotum and protoptera nearly lack scales. Thoracic pleura and median part of metanotum with scales in opercula-bearing sockets, with longitudinal striation (Fig. 601). Femora, tibiae and tarsi densely covered with colorless, short, oval scales in operculae-bearing sockets (sockets 5–6 mkm). Scales on abdominal terga elongate and pointed, with longitudinal striation (Fig. 606). Scales on abdominal sterna either similar (Fig. 603), or partly colorless (Fig. 602).
STOUT SETAE: Outer side of femur with regular row of 5–8 long, clavate setae and 2 subapical setae of same form (Figs 611–613). Inner-anterior side of each femur with small (about 10 mkm length), stout, blunt setae; no longer setae on inner-anterior side of fore femur. Tibia and tarsus with stout setae on inner side (Figs 614–616). Outer-apical seta of tibia small, blunt and elongate (as in Fig. 364).
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). Posterior arm of U-shaped row of long setae on fore- and middle leg situated across tibia (Figs 614–615); on hind leg longitudinal (Fig. 616) [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, V-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 segment bent by convexity medially, and 3rd segment directed caudally and inserted into 2nd segment (Fig. 609) [see Chopralla (5)].
RESPIRATORY MOVEMENTS: Tergalii able to make rhythmic respiratory movements.
Subimago. CUTICULAR COLORATION: Head and antennae colorless, with microtrichia dark brown. Pronotum light brownish. Mesonotum light brown with certain sutures darker and medioparapsidal suture lighter (Fig. 622). Thoracic sterna and pleura with brown and colorless areas (Fig. 621). Legs light brownish, nearly colorless. Wings light, without brown circles at bases of microtrichia. Abdominal terga and sterna brown, cerci colorless.
HYPODERMAL COLORATION: As in imago (see below).
TEXTURE: On all legs of both sexes all tarsal segments entirely covered with pointed microlepides (as in Fig. 391).
Imago, male. Unknown. Judging by subimago developing under larval cuticle, tarsus of middle and hind legs with 1 apical spine on initial 3rd tarsomere (next after 1st+2nd tarsomere); abdomen light with posterior margins of some terga narrowly bordered with reddish-brown (Fig. 623); median projection of penial bridge shallow and truncate; sterno-styligeral muscle present (Fig. 609) [see Chopralla (7)].
Imago, female (Figs 618–620). Head ochre. Thorax and abdomen contrastingly darker (ochre with reddishbrown) in dorsal half and lighter (pale ochre) in ventral half; pronotum and first 4 intersegmental membranes of abdominal terga with pair of transverse bright red stripes; posterior margins of terga narrowly bordered with reddish-brown. Wing with membrane colorless, veins pale ochre or colorless, extreme base of costal vein proximad of costal brace brownish. Femora of all legs ochre, femur of fore leg slightly darker apically; tibiae of all legs ochre, slightly darkened in proximal part (Fig. 618). Patella-tibial suture present on middle and hind legs, absent on forelegs (Fig. 618) [as in male; see Centroptella s. l. (2)]. 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 Figs 691–692). Cerci unicolor pale ochre.
Egg (Figs 624–625). Oval; chorion with net-like relief stretched longitudinally. Micropile without sperm guide.
Dimension. Fore wing length of female 4.3 mm.
Distribution. New Guinea.
Comparison. Centroptella (Chopralla) papuanica sp. n. differs from other species of Chopralla in structure of right prostheca, which is pressed to kinetodontium and lacks long branches (Fig. 608). The same structure of right prostheca occurs in all Crassolus, from which Centroptella (Chopralla) papuanica sp. n. differs by the characters listed in Table 2.
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 124-130, DOI: 10.11646/zootaxa.5054.1.1, http://zenodo.org/record/5577421