Madacryptus, Schöller, 2007

Schöller, M., 2007, A new genus of Cryptocephalinae from Madagascar (Coleoptera: Chrysomelidae), Linzer biologische Beiträge 39 (1), pp. 693-702 : 694-696

publication ID	https://doi.org/ 10.5281/zenodo.5412829
persistent identifier	https://treatment.plazi.org/id/8E397F0E-112F-CE0B-FF7B-6043528CFA36
treatment provided by	Valdenar
scientific name	Madacryptus
status	gen. nov.

Treatment

Madacryptus gen.nov.

T y p e s p e c i e s Cryptocephalus euchlorus DOHRN 1884 by present designation.

E t y m o l o g y: The generic name is composed of parts of the words Madagascar and Cryptocephalus, and is masculine.

D i a g n o s i s:AgenusofCryptocephalinae,Cryptocephalini,Cryptocephalina.Size 2.2-7.5 mm; eyes convex, curvature even; antennal segments 5-11 usually broadest; anterior and lateral sides of pronotum distinctly bordered, basal margin unbordered, i. e. toothed, base of pronotum extended at middle, overlapping base of scutellum; prosternal process quadrate to elongate, bearing a pair of acute or rounded projections; scutellum gradually elevated, rectangular, truncate at apex; elytral punctation, colour, and surface sculpture variable, dorsally glabrous; tarsi elongate; claws simple.

D e s c r i p t i o n: Habitus (Fig. 1). Size 2.2-7.5 mm; body cylindrical, elytra frequently narrowed apically, pronotum strongly vaulted; colour entirely yellowish, or reddish-brown to red, or black with or without blue, green or purple reflections; dorsum glabrous.

H e a d: ( Figs 2-4 View Figs 2-9 ) Large, hypognathous, sunk into thorax, punctation sparse to coarse, eyes evenly convex, relative large, touching or distance between up to 0.5 times eye length; canthus triangular, moderately deep ( Fig. 2 View Figs 2-9 ), setae on canthus present; antennae inserted near lower third of eyes, at base of canthus, antennae with all segments elongate except for ovoid segment 2, 5-11 longest and 6-11 usually broadest, setae present on all antennomeres, dense on sixth to eleventh ( Fig. 3 View Figs 2-9 ), antennal length 0.6 to 0.75 body length, antennae relatively longer in males, segments without circular sensillate depressions, interantennal space five times diameter of antennal socket; sides of clypeus sinuate ( Fig. 2 View Figs 2-9 ), frontoclypeal suture weak to reduced, with a pair of anterior pits, basally concave, glabrous; labrum quadrate with 4 pairs of dorsal setae, placed in a row from the apical corners to the middle, and more than 4 pairs of short apical setae; maxilla ( Fig. 4 View Figs 2-9 ) with galea broad and almost truncate, bent medially, longer than last two palpomeres combined, bearing apical many setae; lacinia shorter but as wide as galea, narrowing apically, thin, weakly pigmented, bearing an apical comb of setae; labium with three palpomeres, last maxillary and labial palps narrowing apically, usually truncate to concave, apical segment of labial palp shaped as maxillary palp; ligula elongate, proximally straight; mandible robust, with two large teeth and one long external seta ( Fig. 5 View Figs 2-9 ).

T h o r a x: Prothorax ( Figs 6 View Figs 2-9 , 10 View Fig ): pronotum evenly curved at sides and contracted at apex, pronotum broadest at base, approximately two times wider than long and anteriorly half as wide as basally, with or without lateral transverse impressions; apical and lateral sides bordered, lateral margins even, carinate or explanate, anterior margin explanate ending in a carina, basal margin unbordered, i.e. toothed ( Fig. 10 View Fig ), base of pronotum extended at middle, overlapping base of scutellum; disk strongly and closely punctured to impunctate, without lateral depressions, hind corners with setiferous pore, front edge of pronotum ridged, sides of front margin not projecting beyond prosternum, posterior angles of pronotum right-angled to distinctly produced, male pronotum as wide as or slightly wider than elytral base; intercoxal prosternal process wide ( Fig. 6 View Figs 2-9 ), quadrate to elongate, narrowed in apical third, as wide as coxal cavity, front margin convex with a narrow carina, hind margin bearing a pair of flat acute or blunt rounded posterolateral projections between coxae, consequently M-shaped in ventral view, prosternal opening relatively narrow, posterior margin of prosternal process does not extend beyond hypomeral projection, coxal cavity closed ( Fig. 6 View Figs 2-9 ), prosternal process usually densely setose, hypomeron impunctate; proendosternites about half the length of prosternal process, their base wide and short; procoxal cavity wider than long; mesothorax: scutellum slightly longer than wide, elongate, rectangular or rarely apically widened, basally emarginate, truncate at apex, impunctate, smooth, gradually elevated; mesoscutum ( Fig. 7 View Figs 2-9 ) twice as long as mesoscutellum, medially with coarse punctation and wrinkles, not keeled on midline, anteriorly convex with narrow, elongate arms (not figured), without lateral patches of microchaetae; mesosternum distinct between coxae, broad, narrower than prosternum, mesosternal intercoxal process as wide as prosternum; elytra 3-4 x length of pronotum, slightly apically expanded for basal ¼ then gradually attenuate, punctation mostly with nine regular striae, plus a short scutellar stria and a row of punctures abutting epipleura, interstriae flat or convex, or punctation substriate or confused, basal margin of elytra simple or bulging, elytra with prominent humeri, elytra with or without lateral transverse impressions, in some species elytra with ridges or tubercles, elytra regularly oblate, reaching base of pygidium, elytral suture bordered, untoothed; epipleuron gradually attenuate to apex, smooth or irregularly punctured or with single stria; metathorax: hind wing apical dark, radial triangle cell closed, radial transverse short, radio-mediane absent, but a chitinised patch present at this location, i.e. medial cell open, 2 nd and 3 rd anal nerves, and cubital nerves weakly developed, anal cell open, 1 st anal nerve and median nerves 1 and 2 strongly developed ( Fig. 8 View Figs 2-9 ); metasternum prominent, convexly swollen ventrally, epimeron densely setose; legs (Fig. 1) long and slender, all femora of similar size, without ventral keel, tibiae almost straight, tibial spurs absent, external edge of tibia excavate, excavation with fringe of strong setae, all tarsal segments elongate, in male first segment of fore- and mid tarsi widened to quadrate in some species, dorsally convex, claws symmetrical, simple to dentate ( Fig. 9 View Figs 2-9 ).

A b d o m e n:Tergiteshard,strongly sclerotised, spiracles free in basal tergites; lateral lobe at base of abdomen angular, intercoxal abdominal process of ventrite I broad, slightly concave, sternite III longer than sternites IV to VII along midline; sternite VII not indented in male, apex of male abdomen without hollow; tergites reaching sternites; pygidium densely microsculptured, dull, or smooth and shiny, pygidium regularly convex or with an obtuse keel along midline.

M a l e g e n i t a l i a: ( Figs 11-17 View Figs 11-17 ) Aedeagus straight, but apex recurved in most species, aedeagal lobe with complex apical ridges and lobes ( Figs 11-16 View Figs 11-17 ), venter simple, without longitudinal ventral keel or transparent "windows" in wall of reflexed apex, ventral ( Fig. 11 View Figs 11-17 ) and dorsal ( Fig. 12 View Figs 11-17 ) aedeagal setae present, dorsal setae on lateral, sclerotised or membranous (in M. euchlorus) cones, flagellum simple, ejaculatory guide complex, with more than three pairs of clasps and band-shaped sclerites which are connected by muscles and connective tissue; tegmen broad, U- or V - shaped, keeled, with expanded sides and bifid base ( Fig. 17 View Figs 11-17 ), spiculum gastrale fused.

F e m a l e g e n i t a l i a a n d K o t p r e s s e: ( Figs 18-22 View Figs 18-22 ) Vaginal palp with all borders wholly sclerotised, apical border narrow, rounded ( Fig. 18 View Figs 18-22 ); spermatheca with long collum, sinuate and falciform, receptaculum V-shaped ( Fig. 19 View Figs 18-22 ), accessory gland simply emerging from vascular bulb, or from a little stick; rectum with dorsal fold of intestine and lateral folds, kotpresse with two dorsal ( Fig. 20 View Figs 18-22 ) and two ventral ( Fig. 21 View Figs 18-22 ) sclerites, apodemes wider than rectum ( Fig. 22 View Figs 18-22 ); females with apex of egg-hollow not indented, with large deep egg-hollow.

Immature stages unknown.

D i f f e r e n t i a l d i a g n o s i s Madacryptus gen.nov. may be distinguished from Cryptocephalus GEOFFROY and Melixanthus SUFFRIAN by the following combination of character states: truncate median posterior lobe of pronotum raised, with three teeth at apex, scutellum rectangular and antennae filiform, kotpresse with two ventral sclerites, and dorsal aedeagal setae on lateral cones.

D i s t r i b u t i o n: The genus is endemic to Madagascar, Mauritius and Aldabra.

C h e c k l i s t o f i n c l u d e d s p e c i e s: Format used is as follows: species name with author, date and page in brackets, because they are all new combinations, originally all species were placed in Cryptocephalus if not otherwise indicated; additional references if present; # = type specimens examined in MLUH, MRAC or ZMHB ; all species from Madagascar if not otherwise mentioned.

anthrax (FAIRMAIRE 1904: 266)

argyropleurus (FAIRMAIRE 1901: 237) #

coeruleipennis (JACOBY 1901: 288) #

costipennis (DUVIVIER 1891: 364)

ebenus (FAIRMAIRE 1897: 200) #

euchlorus (DOHRN 1884: 182) #

flavomelas (FAIRMAIRE 1902: 260)

imitans (JACOBY 1901: 289) #

impressidorsis (FAIRMAIRE 1904: 265)

mauritiensis (PIC 1936: 11) #; Mauritius

mutilatus ( SUFFRIAN 1857: 71) #

nodulosus (WEISE 1910: 454) #