Centroptella (Chopralla) papuanica, Kluge, 2021

Kluge, Nikita J., 2021, Review of Centroptella Braasch & Soldán 1980 (Ephemeroptera, Baetidae), Zootaxa 5054 (1), pp. 1-144 : 124-130

publication ID	https://doi.org/ 10.11646/zootaxa.5054.1.1
publication LSID	lsid:zoobank.org:pub:75417CFA-BF40-4B6F-A317-DEBFB447893D
DOI	https://doi.org/10.5281/zenodo.5781535
persistent identifier	https://treatment.plazi.org/id/03936656-F610-E0D3-7AB0-FCFFFEAAFD9A
treatment provided by	Plazi
scientific name	Centroptella (Chopralla) papuanica
status	sp. nov.

Treatment

3.4. Centroptella (Chopralla) papuanica sp. n.

( Figs 591–625 View FIGURES 584–597 View FIGURES 598–606 View FIGURES 607–610 View FIGURES 611–617 View FIGURES 618–623 View FIGURES 624–625 )

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 View FIGURES 598–606 ). 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 View FIGURES 611–617 ). 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 View FIGURES 598–606 ). Caudalii light brownish ( Fig. 617 View FIGURES 611–617 ).

HYPODERMAL COLORATION: Reddish-brown stripe on posterior margin of metanotum and each abdominal tergum (as in winged stages— Fig. 620 View FIGURES 618–623 ).

SHAPE: Labrum either equally wide at base and middle, or slightly wider at base ( Fig. 604 View FIGURES 598–606 ). 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 View FIGURES 607–610 ). 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 View FIGURES 611–617 ). 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 View FIGURES 611–617 ) [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 View FIGURES 598–606 ). Posterior projection of tergum X with small, irregular denticles on median part, laterally with paired groups of 2–5 long denticles ( Fig. 610 View FIGURES 607–610 ). Sterna I–IV without denticles; sterna V–VIII with regular, pointed, triangular denticles ( Fig. 602 View FIGURES 598–606 ). Posterior margin of sternum IX in female convex, with row of triangular denticles diminished medially ( Fig. 603 View FIGURES 598–606 ), in male without denticles between protogonostyli ( Fig. 609 View FIGURES 607–610 ). Paraprocts with thin and colorless antero- median apodeme, with large pointed denticles on posterior margin ( Fig. 610 View FIGURES 607–610 ).

Tergalius I narrow, elongate-ellipsoid; other tergalii wider, gradually changing in shape from tergalius II to tergalius VII ( Figs 591–597 View FIGURES 584–597 ). 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 View FIGURES 611–617 ).

SCALES: Scales on occipit, median parts of pronotum and mesonotum very small (with sockets 3–4 mkm and length 4–5 mkm) ( Fig. 600 View FIGURES 598–606 ). 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 View FIGURES 598–606 ). 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 View FIGURES 598–606 ). Scales on abdominal sterna either similar ( Fig. 603 View FIGURES 598–606 ), or partly colorless ( Fig. 602 View FIGURES 598–606 ).

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 View FIGURES 611–617 ). 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 View FIGURES 611–617 ). Outer-apical seta of tibia small, blunt and elongate (as in Fig. 364 View FIGURES 364–368 ).

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 View FIGURES 512–517 ). Posterior arm of U-shaped row of long setae on fore- and middle leg situated across tibia ( Figs 614–615 View FIGURES 611–617 ); on hind leg longitudinal ( Fig. 616 View FIGURES 611–617 ) [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 View FIGURES 560–565 ; see Centroptella s. l.). Tergum VII with pair of fine, V-shaped setae sublaterally (g) (as in Fig. 406 View FIGURES 404–406 ). 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 View FIGURES 607–610 ) [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 View FIGURES 618–623 ). Thoracic sterna and pleura with brown and colorless areas ( Fig. 621 View FIGURES 618–623 ). 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 View FIGURES 387–392 ).

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 View FIGURES 618–623 ); median projection of penial bridge shallow and truncate; sterno-styligeral muscle present ( Fig. 609 View FIGURES 607–610 ) [see Chopralla (7)].

Imago, female ( Figs 618–620 View FIGURES 618–623 ). 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 View FIGURES 618–623 ). Patella-tibial suture present on middle and hind legs, absent on forelegs ( Fig. 618 View FIGURES 618–623 ) [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 View FIGURES 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 View FIGURES 607–610 ). 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. View TABLE 2 View TABLE 3