Mimela amphichroma, Prokofiev & Zorn, 2016
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publication ID |
https://doi.org/ 10.21248/contrib.entomol.66.2.329-346 |
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DOI |
https://doi.org/10.5281/zenodo.10530547 |
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persistent identifier |
https://treatment.plazi.org/id/7A52E960-FF87-501F-FF67-F957FDBFA82F |
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treatment provided by |
Carolina |
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scientific name |
Mimela amphichroma |
| status |
sp. nov. |
Mimela amphichroma spec. nov.
( Figs 1, 2 View Figs 1–14 , 15–17 View Figs 15–28 )
Holotype: “ VIETNAM, Lam Dong prov., Lac Duon distr., Bi Doup – Nui Ba Natl. Park, Hon Giao Pass , 12°10'58" N, 108°42'50" E, alt. 1625 m, at light, 23– 24.4.2012, A.M. Prokofiev leg. | [holotype label]” ( CAP). GoogleMaps
Paratypes: 7 , 8 “ VIETNAM, Lam Dong prov., Lac Duon distr., Bi Doup – Nui Ba Natl. Park, alt. 1500– 1625 m, at light, 5.2009, A.M. Prokofiev leg. | [paratype label]” ( CAP). 32 , 33 , [same data as above but 4.2010] | [paratype label]” ( CAP). 25 , 16 [same data as above but 4–5.2012] | [paratype label] ( CAP) .
Description (holotype): Length 14.0 mm, greatest width 8.0 mm. Deep-green above, reddish-testaceous below; clypeus, anterior part of frons, antennae, and side margins of pronotum yellow to testaceous; elytra and pygidium with yellowish tint; tarsi darker than the other parts of legs; protibial teeth margined with black; pilosity pale.
Clypeus almost rectangular, with anterior angles broadly rounded, anterior margin straight, weakly raised. Frontoclypeal suture distinct. Clypeus finely transversely rugose, more coarsely in the middle. Frons coarsely, rugosely punctate in the anteriormost part, punctures becoming well but somewhat unevenly spaced posteriad, less dense in outer thirds than along mid-line. Pronotum twice broader than long, sides almost parallel in basal half, distinctly convergent in anterior half; anterior angles produced, sharp; posterior angles weakly obtuse, shortly rounded. Anterior margin of pronotum with marginal line, weakly bisinuate; posterior margin of pronotum strongly convex in the middle third, indistinctly concave in outer thirds, marginal line interrupted before scutellum. Pronotum rather coarsely but very unevenly punctured, punctures being much denser and more coarse in the middle third of each half of pronotum, becoming finer and sparser toward the sides and middle of disc; there are only few very fine punctures in the area before the scutellum. Midline of pronotum with short distinctly impressed groove; there is a distinct oblique impression before the posterior angles. Scutellum finely and unevenly punctured. Posterior margin of scutellum ogival. Surface of head, pronotum and scutellum with very fine microsculpture which is less developed on elytra. Elytra deeply and slightly unevenly punctured, punctures simple, well-spaced; punctate rows of elytra obvious, with a single row of punctures close to the suture and three double rows on disc of each elytron. Sides of elytra with marginal line, except the apical quarter, epipleura with a row of distant short setae, the latter longer and more numerous under humeral umbo. Pygidium convex, coarsely and unevenly punctured (punctures becoming denser at sides), glabrous except for moderately long and sparse setae along outer margin.
Prosternal process well-developed, plough-shaped, bluntly pointed anteriorly. Mesometasternal process very short, bluntly pointed. Sides of sterna coarsely, rugosely punctate and setose, with rather long but not dense adpressed hairs; disc of metasternum glabrous, impressed. Sides of abdominal sternites finely but irregularly rugosely punctate, punctures becoming very fine and sparse toward middle; glabrous, except for a transverse row of short distant setae in the middle of each sternite, and for the last visible sternite, which possesses short distant setae along posterior border.
Protibia bidentate, teeth closely spaced, inner spur attached just behind the level of apex of basal tooth. Last joint of fore tarsi moderately thickened, toothed at midlength of its ventral margin. Inner fore claw broadened, strongly excavated at base of its ventral margin, with lobes slightly divergent, lower lobe twice broader than upper at base. Outer claw of middle tarsi cleft.
Aedeagus: Figs 15–17 View Figs 15–28 .
Female: Antennal club shorter. Pygidium less convex, setae along outer margin slightly more numerous. Teeth of protibia blunter, apical tooth longer and broader. Inner spur attached well behind basal tooth of protibia. Last joint of fore tarsi somewhat broadened distally, only slightly indented near middle of its margin; inner claw narrow, with lower lobe only 1.5 times broader than the upper one at base. Vaginal palpi triangular, densely setose.
Variations (both sexes): Length 13.5–15.0 (usually about 14.0) mm, greatest width 7.0– 8.5 mm. Density of punctation of dorsal surface (especially on head) is variable, surface of most closely punctured parts of pronotum in many cases wrinkled between punctures, especially in the females. Length of pronotum is somewhat variable.
Two color morphs exist. The green form varies from deepgreen to greenish-yellow from above, in extreme cases (most pale variants) the head is completely yellowishtestaceous with greenish tint on vertex, pronotum with a pair of deep-green spots on disc; pygidium green with outer margin yellowish. The violet form is coffee-red to violet brown from above, with pronotum and pygidium usually (sometimes also disc of elytra) darker; pronotum with or without yellowish side margins, in some cases pygidium also with yellowish outer border. The underside is usually darker than in the green form. Live beetles have a pronounced violet tint disappearing in dry specimens. In both forms the tarsi can have the same color as the other parts of legs or can be darker. No transitional forms between both color forms were observed yet, but structurally and in genitalia shape they are identical.
Differential diagnosis: Mimela amphichroma is very similar to M. plicatulla LIN, 1990 so far known from Yunnan, but the apices of the parameres are much more strongly curved in M. amphichroma (compare fig. 14 in LIN (1990) and figs 61-63). A violet color form is unknown in M. plicatulla .
It is similar also to Mimela abdominalis OHAUS, 1902 , but differs from the latter species in the irregular (vs. regular) punctation of the head, in the much more pronounced medial sulcus and impressions at the hind angles of pronotum, in the very uneven punctation of pronotum (vs. pronotum rather regularly, coarsely and densely punctured, punctures becoming smaller and somewhat sparser toward the anterior and side margins of pronotum in M. abdominalis ) and in the fine (vs. coarse) punctation of the scutellum.
Distribution: So far known only from the Dalat Plateau, South Vietnam.
Etymology: The species name is derived from the Greek prefix “Αμφι” (double) and the noun “ΧΡώμΑ” (color), alluding to the existence of two color morphs in this species, to be used as noun in apposition.
No known copyright restrictions apply. See Agosti, D., Egloff, W., 2009. Taxonomic information exchange and copyright: the Plazi approach. BMC Research Notes 2009, 2:53 for further explanation.
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