Bungona (Centroptella) quadrata Shi & Tong,

Shi, Weifang & Tong, Xiaoli, 2019, Genus Bungona Harker, 1957 (Ephemeroptera: Baetidae) from China, with descriptions of three new species and a key to Oriental species, Zootaxa 4586 (3), pp. 571-585: 575-577

publication ID

https://doi.org/10.11646/zootaxa.4586.3.12

publication LSID

lsid:zoobank.org:pub:91C77484-124B-47CB-9DAA-C0BFA4284B17

persistent identifier

http://treatment.plazi.org/id/039E87F8-167D-E53F-FF39-FD21FF48FE38

treatment provided by

Plazi

scientific name

Bungona (Centroptella) quadrata Shi & Tong
status

sp. nov.

Bungona (Centroptella) quadrata Shi & Tong  , sp. nov.

( Figs 16View FIGURES 16–26 –31,48)

Material examined. Holotype.GoogleMaps  1 mature nymph in ethanol, CHINA, Guangxi, Jinxiu County, Fenzhan   GoogleMaps (24.12°N, 110.21°E, alt. 779m), 16.xi.2011, coll. Weifang Shi.

Paratypes (deposited in ethanol unless otherwise stated). 2 nymphs on mounted slides and 1 nymph, same data as holotype; CHINA. Guangxi: 3 nymphs, Wuming County, Daming Mountain (23.52°N, 108.34°E, alt. 830m), 8.ix.2011, coll. Weifang Shi.GoogleMaps  Guangdong: 1 nymph on mounted slides and 1 nymph, Heyuan City, Yequgou Scenic (23.71°N, 114.62°E, alt. 210m), 14.ix.2011, coll. Weifang Shi.GoogleMaps  2 nymphs, Yingde City, Shimentai Nature Reserve, Hengshitang (24.43°N, 113.31°E, alt. 810m), 2.xi.2011, coll. Weifang Shi.GoogleMaps 

Description. Mature nymph. Body length 3.3–3.7mm, cerci 1.3–1.7mm, median caudal filament slightly shorter than cerci.

Colouration. Vertex brown with white ecdysial line. Thorax pale brown shading to brown smudges on pro- and mesonotum; femora pale brown shaded with one brown marking submedially, tibiae and tarsus pale brown with dark brown proximally. Abdominal tergites almost uniformly brown ( Fig. 31View FIGURES 27–31). Cerci cream to yellowish brown.

Head. Antennae approximately 1.3 x width of head, pedicel approximately 2 x length of scape ( Fig. 16View FIGURES 16–26). Labrum ( Fig. 17View FIGURES 16–26): rectangular, width approximately 1.6 x length; anteromedian notch shallow with one small rounded lobe at base; dorsally each side with one medial long seta and one row of 3–4 robust and simple submarginal setae, fine and simple setae scattered posteriorly; ventrally bordered with feathered setae along distal margin and one disto-medial arc of very fine setae. Left mandible ( Fig. 19View FIGURES 16–26): incisors fused, apically with 6 denticles; prostheca robust with 2 acute and 3 blunt denticles apically; plane of mandible between incisor base and molar region smooth. Right mandible ( Fig. 20View FIGURES 16–26): incisors partially fused, inner and outer incisors with 3+3 denticles respectively; prostheca slender, plumose and bifurcated at middle; plane of mandible between incisor base and molar region smooth. Hypopharynx with one median projection and superlinguae broadly truncate, covered with abundant fine setae. Maxillae ( Fig. 21View FIGURES 16–26) with one row of 4 long basal setae and one short bristle-like hump seta on basis of galealacinia; maxillary palpus 2-segmented, weakly shorter than galealacinia, segment II pointed apically, approximately 2.0 x length of segment I. Labium ( Fig. 18View FIGURES 16–26): glossae slightly longer than paraglossae, ventrally with one row of 10–12 acute, stout setae along the inner margin and 4 robust setae at the apex, dorsally with 5–6 long, stout setae along the outer margin; paraglossae ventrally with one row of 5–6 acute, stout setae along the inner margin and 11–13 acute, stout setae along the outer margin. Labial palpus 3-segmented; segment I subequal to segment II and III combined in length, scattered with numerous pores dorsally and fine setae ventrally; segment II slightly projected apically, dorsal surface with one row of 3 long, acute setae apicomedially, ventrally scattered with numerous fine, simple setae; terminal segment rectangle, scattered with plenty of stout, simple setae ventrally.

Thorax. Pronotum surface smooth without tubercles. Hindwing pads minute but visible ( Fig. 22View FIGURES 16–26). Leg surfaces scattered with trapezoidal scale bases. Femora approximately 4.5 x maximum width, dorsally with row of about 6 long, robust setae which approximately 1/3–1/4 of femoral width and one pair of close-set stout subapical setae ( Fig. 27View FIGURES 27–31), ventrally with numerous pores; tibiae ( Figs 23–25View FIGURES 16–26) dorsally with fine setae, ventrally with one row of slightly acute stout setae and one pair of long, stout, slightly feathered setae apically; tarsi dorsally with fine setae, ventrally with one row of slightly acute stout setae. Claw smooth without denticles ( Fig. 26View FIGURES 16–26), apically with 3–4 furrows; subapical setae vestigial.

Abdomen. Abdominal tergal surface scattered with scale bases and triangular scales densely ( Fig. 28View FIGURES 27–31). posterior margin of tergites II–X with contiguous acute spines, successively increasing in length backwards; sternal surface scattered with numerous scale bases and pores; sternites IV–IX with triangular spines posteriorly ( Fig. 29View FIGURES 27–31); sternites II–VI each with one pair of setal tufts anterolaterally; paraproct ( Fig. 48View FIGURES 47–49) subtriangular, surface scattered with trapezoidal scale bases and triangular scale densely, inner margin with 8–9 long and pointed spines. Gills with 7 pairs, asymmetric and well tracheated ( Fig. 31View FIGURES 27–31). Median caudal filament slightly shorter than cerci; inner margin of cerci and two sides of median caudal filament fringed with long swimming bristles; distal margin of each segment with trapezoidal scale bases and every two segments with long, stout spines distally ( Fig. 30View FIGURES 27–31).

Imagoes. Unknown.

Etymology. The specific epithet “ quadrata  ” is from Latin adjective “quadratus”, meaning “rectangular” and referring to the terminal segment of labial palpus rectangle-shape.

Distribution and biology. China (Guangxi, Guangdong). The nymphs are usually found on the stone surfaces in shallows or lentic habitats of mountainous streams.

Comments. Compared with other species of the subgenus Centroptella  whose body with relatively contrasting colour pattern, this new species is easily recognized by the body coloration relatively uniformly brown. Apart from that, this new species is somewhat similar to B. (C.) ovata  sp. nov. in structure, but it can be separated from the latter by (1) antennal pedicel much longer, approximately 2 x length of scape ( Fig. 16View FIGURES 16–26); (2) terminal segment of labial palpus rectangular ( Fig. 18View FIGURES 16–26) instead of irregular trapezoidal and with distal margin truncated ( Fig. 8View FIGURES 6–15); (3) posterior marginal spines present on tergites II–X, while such spines present on tergites III–X in B. (C.) ovata  sp. nov..

Kingdom

Animalia

Phylum

Arthropoda

Class

Insecta

Order

Ephemeroptera

Family

Baetidae

Genus

Bungona