Nitidulidae Latreille, 1802

Hisamatsu, Sadatomo, Bayless, Victoria M. & Carlton, Christopher E., 2016, Revision ofCyclocaccusSharp (Coleoptera: Nitidulidae: Nitidulinae), The Coleopterists Bulletin 70 (4), pp. 825-870: 825-870

publication ID

http://doi.org/ 10.1649/0010-065X-70.4.825

persistent identifier

http://treatment.plazi.org/id/F042A324-FFD1-FFA7-08F5-ECBFFD83885A

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Diego

scientific name

Nitidulidae Latreille, 1802
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Family Nitidulidae Latreille, 1802   Subfamily Nitidulinae Latreille, 1802   Tribe Cyllodini Everts, 1898   Genus Cyclocaccus Sharp, 1891  

Type Species. Cyclocaccus laeticulus Sharp, 1891   (designated by Leschen 1999).

Diagnosis. This genus differs from other Neotropical Cyllodini   by the following combination of characters: body round to oval; head without occipital line; frontoclypeal suture incomplete; labrum shallowly emarginate at middle; mandibles with subapical tooth; antennal club usually as long as or slightly shorter than antennal segments I–VIII; antennal segment XI with one or two oval antennal sensillae; scutellum large, apical margin broadly rounded; apical margin of abdominal tergite VII widely rounded or truncate; prosternum narrow, about as wide as greatest width of protibia (except prosternal process); prosternal disc feebly or strongly convex along midline, if disc strongly convex, with tuft of setae at middle in males; meso-metaventrite junction evenly concave; axillary space on metaventrite present, well-developed; metanepisternum about as wide as greatest width of protibia; abdominal sternite III with or without subcoxal lines; apical and lateral margins of tegmen strongly undulating, short and wide, or long and subparallel-sided; gonocoxites deeply incised or square at apex.

Redescription. Length 1.57–2.79 (2.07) mm, width 1.30–2.20 (1.70) mm, depth 0.74–1.30 (0.99) mm (n = 68). Male. Body round to oval ( Figs. 1 View Fig , 10 View Fig , 15 View Fig ); dorsum and venter strongly shining; disc with or without iridescence, strongly convex dorsally, moderately convex ventrally; coloration variable. Head: Hypognathous, wider than long; occipital line absent; frontoclypeal suture ( Figs. 2B View Fig , 11B View Fig , 16B View Fig ) incomplete. Clypeus with apical margin almost straight. Labrum ( Figs. 2D View Fig , 11D View Fig , 16D View Fig ) shallowly emarginate at middle; disc with a pair of depressions, each possessing 2 long setae. Mandibles ( Figs. 2G View Fig , 11G View Fig , 16G View Fig ) strongly curved inwardly; apex acute, with subapical tooth; mola with small grinding surface; prostheca with setal region; dorsal disc with or without latitudinal keel at middle. Maxillae ( Figs. 2F View Fig , 11F View Fig , 16F View Fig ) elongate; lacinia prolonged and thick, possessing long and dense setae entirely; palpi with 4 palpomeres; palpomere I shorter than palpomere III; palpomere II longer than palpomere III; palpomere IV conical shape, longer than palpomeres I–III. Labium ( Figs. 2E View Fig , 11E View Fig , 16E View Fig ) with 3 palpomeres, palpomere I distinctly shorter than palpomere II; palpomere III slightly longer than palpomere II. Mentum ( Figs. 2E View Fig , 11E View Fig , 16E View Fig ) transverse, with anterior margin concave. Eyes large. Genae feebly developed. Antennae with 11 antennomeres; scape elongate, slightly shorter than segments II and III combined; club loosely jointed, as long as or slightly shorter than antennal segments I–VIII; antennal segment XI with 2 ( Figs. 3C View Fig , 4E View Fig , 5G View Fig , 6G View Fig , 12C View Fig , 13C View Fig , 14C View Fig , 17C View Fig , 18G View Fig , 19C View Fig , 20C View Fig , 21C View Fig ) or rarely 1 ( Figs. 7C View Fig , 8C View Fig , 9C View Fig ) oval antennal sensilla. Antennal grooves ( Figs. 2C View Fig , 11C View Fig , 16C View Fig ) shallow, distinctly outlined, moderately converging posteriorly, and widely separated posteriorly. Pronotum: Strongly convex, transverse; lateral margins narrowly explanate; anterior margin evenly, moderately emarginate; anterior angles rounded; posterior angles subrectangular; disc with sparse, minute punctures, or with dense, large punctures, which are slightly smaller than eye facets. Scutellum: Large ( Figs. 2H View Fig , 11H View Fig , 16H View Fig ); apical margin broadly rounded; lateral margins sinuate. Elytra: Strongly convex, with subsutural line; lateral margins narrowly explanate; disc with 9 rows of punctures. Abdominal tergite VII with apical margin widely rounded ( Fig. 2I View Fig , 11J View Fig ) or truncate ( Fig. 16I View Fig ). Venter: Prosternum narrow, about as wide as greatest width of protibia; disc feebly ( Figs. 2A View Fig , 11A View Fig ) or strongly ( Fig. 16A View Fig ) convex along midline, if the disc strongly convex, with tuft of setae at middle; prosternal process in ventral view moderately expanded behind procoxae, apical margin widely rounded. Mesoventrite strongly carinate at midline. Meso-metaventrite junction evenly concave. Inter-mesocoxal distance (n = 14) separated by 1.23–2.26 times width of interprocoxal distance. Inter-metacoxal distance (n = 14) separated by 1.59–2.60 times width of inter-procoxal distance. Metaventrite strongly convex, impunctate; subcoxal bead not broadly connected at middle of metaventrite; metathoracic discrimen absent or present in apical area; axillary space ( Figs. 2A View Fig , 11A View Fig , 16A View Fig ) present, well-developed; inter-metacoxal margin widely emarginate. Metendosternite ( Figs. 2K View Fig , 11L View Fig , 16L View Fig ) of cucujoid-hylecoetoid type; anterior tendons long and slender, V-shaped; fuscal arms long and slender, straight or slightly arcuately elongated laterally, with a pair of lateral lobe of ventral process at each base, base of furca broadly attached to metaventrite. Metanepisternum ( Figs. 2P View Fig , 11Q View Fig , 16Q View Fig ) wide, about as wide as greatest width of protibia; disc impunctate or densely punctate, separated into 2 spaces. Abdominal sternite III with ( Figs. 11I View Fig , 16A View Fig ) or without ( Figs. 2A View Fig , 11A View Fig ) subcoxal lines; subbasal line on each abdominal sternite complete; disc impunctate or punctate; lateral margins of abdominal sternite VII strongly serrate or not. Legs: Femora of normal shape and size; apicolateral corner of protarsi ( Figs. 2L View Fig , 11M View Fig , 16M View Fig ) subrectangular; meso- and metatibiae with sublateral line of setae on dorsal face; pro- and mesotarsomeres I–III weakly to strongly bilobed, with dense setal pads; metatarsomeres not bilobed or dilated; pro-, meso-, and metatarsomeres V with 2 pairs of long setae ventrally; tarsal claws simple. Genitalia: Tegmen short and wide or long and slender in ventral view; lateral margins of tegmen strongly undulating ( Figs. 3A View Fig , 4A, 4C View Fig , 5C, E View Fig , 6A, 6C, 6E View Fig , 7A View Fig , 8A View Fig , 9A View Fig ), not undulating and converging anteriorly ( Figs. 12A View Fig , 13A View Fig , 14A View Fig ), or subparallel-sided ( Figs. 17A View Fig , 18A, 18C, 18E View Fig , 19A View Fig , 20A View Fig ) in ventral view; median lobe long and slender, with long appendages arising from apical 1/3–1/4 of dorsal face, sometimes exceeding apical margin of median lobe. Female. Abdominal sternite VII with apical margin widely rounded; pro- and mesotarsal segments I–III more weakly dilated than those of males. Ovipositor with gonocoxites widely separated at apex ( Figs. 3D View Fig , 4F View Fig , 5F View Fig , 6H View Fig , 7D View Fig , 8D View Fig , 9D View Fig ) or with squared apices ( Figs. 12D View Fig , 13D View Fig , 14D View Fig , 17D View Fig , 18H View Fig , 20D View Fig , 21D View Fig ); styli absent.

Bionomics. Fungal hosts that have been reported include Cortinariaceae   (?), undetermined Agaricales   , and undetermined crustose polypores (Leschen 1999). Additional information recorded in data of material examined corroborates associations with fleshy Agaricales   on woody substrates.

Distribution. Neotropical Region ( Mexico, Central and South America).

Comments. We recognize three species-groups and 15 species. Two species included in the C. laeticulus   species-group ( C. epakros Hisamatsu   , new species and C. maculatus Hisamatsu   , new species) occur in the mountains of Mexico. The remaining species occur in Central and/or South America.

KEY TO THE SPECIES- GROUPS OF CYCLOCACCUS  

1. Prosternum ( Figs. 2A View Fig , 11A View Fig ) feebly convex along midline, without tuft of setae at middle in males ......................................................... 2

1′. Prosternum ( Fig. 16A View Fig ) strongly convex along midline, with tuft of setae at middle in males ................. C. morulus   species-group

2. Disc of metanepisternum ( Fig. 2P View Fig ) and abdominal sternites not punctate; apices of gonocoxites ( Figs. 3D View Fig , 4F View Fig , 5H View Fig , 6H View Fig , 7D View Fig , 8D View Fig , 9D View Fig ) incised ...... C. laeticulus   species-group

2′. Disc of metanepisternum ( Fig. 11Q View Fig ) and abdominal sternites punctate; apices of gonocoxites ( Figs. 12D View Fig , 13D View Fig , 14D View Fig , 17D View Fig , 18H View Fig , 20D View Fig , 21D View Fig ) continuous, more or less truncate ........... C. brevicollis   species-group