Mexiconnus mexicanus (Franz) Franz, 2013

Jałoszyński, Paweł, 2013, Taxonomy of ' Euconnus complex'. Part II. Revision of Archiconnus Franz, Parapseudoconnus Franz and Mexiconnus gen. nov. (Coleoptera, Staphylinidae, Scydmaeninae), Zootaxa 3666 (4), pp. 523-543 : 532-533

publication ID

https://doi.org/ 10.11646/zootaxa.3666.4.7

publication LSID

lsid:zoobank.org:pub:4470BF7B-DCDB-4668-B221-600A9EDE11FA

DOI

https://doi.org/10.5281/zenodo.6146059

persistent identifier

https://treatment.plazi.org/id/C853F731-2418-0C50-FF34-FD4CB5B5FE6C

treatment provided by

Plazi

scientific name

Mexiconnus mexicanus (Franz)
status

comb. nov.

Mexiconnus mexicanus (Franz) View in CoL comb. nov.

( Figs. 10–18 View FIGURES 10 – 11 View FIGURES 12 – 18 )

Archiconnus mexicanus Franz, 1994: 376 , fig. 72.

Material studied. Holotype: 3: three labels ( Fig. 11 View FIGURES 10 – 11 ): "Umg. San-Cristobal / Chiapas, Mexico " with "Mx 16" on the reverse side [white, printed; reverse handwritten], " Archiconnus / mexicanus m. / det. H. Franz" [white, handwritten and printed], " Holotypus " [red, handwritten] (NHMW). A white printed label was added during the present study: " MEXICONNUS / mexicanus / (Franz, 1994) / det. P. JAŁOSZYŃSKI, '13".

Diagnosis. This is the only known species of Mexiconnus and can be identified on the basis of the generic characters and the aedeagus.

Description. Body of male ( Fig. 10 View FIGURES 10 – 11 ) slightly flattened, elongate and slender, with long appendages, BL 0.93 mm; glossy, uniformly moderately dark brown with slightly lighter appendages; vestiture slightly lighter than cuticle.

Head ( Figs. 10 View FIGURES 10 – 11 , 12 View FIGURES 12 – 18 ) short and rhomboidal in shape, broadest at eyes, HL 0.18 mm, HW 0.20 mm; occipital constriction slightly broader than half HW; tempora slightly longer than eyes, strongly convergent caudad and only weakly rounded; vertex strongly transverse, convex, not expanded dorso-caudad; frons confluent with vertex, slightly convex, subtrapezoidal and steeply but not abruptly lowering towards strongly transverse clypeus; supraantennal tubercles feebly marked; eyes large and strongly convex, kidney-shaped and transverse in relation to the long axis of the head, finely faceted. Punctures on head dorsum fine and sparse, inconspicuous; setae long, moderately dense, suberect to erect, those on vertex and tempora directed caudad, thick bristles absent. Antennae ( Fig. 10 View FIGURES 10 – 11 ) long and slender, with moderately distinctly delimited club composed of antennomeres IX–XI, AnL 0.50 mm; antennomeres I–IX elongate; X distinctly transverse; XI only 1.2x as long as broad, symmetrical, with broadly rounded apex.

Pronotum ( Fig. 10 View FIGURES 10 – 11 ) in dorsal view elongate oval, broadest in anterior fourth, PL 0.25 mm, PW 0.23 mm; anterior margin slightly arcuate; front angles indistinct; lateral margins strongly rounded and strongly convergent towards well-marked, obtuse and blunt hind angles; posterior margin slightly arcuate; base of pronotum with deep and distinct transverse ante-basal groove slightly deepened at each end and not reaching lateral pronotal margins. Punctures on pronotal disc fine and inconspicuous; setae moderately long and dense, suberect, sides of pronotum with thick and long bristles.

Elytra ( Fig. 10 View FIGURES 10 – 11 ) oval and only slightly more convex than pronotum, broadest near middle, EL 0.50 mm, EW 0.35 mm, EI 1.43; humeral calli distinct, each developed as short longitudinal protuberance; basal elytral impressions distinct; basal pits indiscernible in a dry-mounted specimen; elytral apices separately rounded. Punctures on median circumsutural part of elytral disc more distinct and denser than those on pronotum but only superficial and with diffused margins, punctures on remaining surface of elytra fine and inconspicuous; setae short, moderately sparse and suberect. Hind wings well-developed, about twice as long as elytra.

Legs ( Figs. 10 View FIGURES 10 – 11 , 15–16 View FIGURES 12 – 18 ) long and slender; protarsi strongly broadened at base and with dense cushion of long setae on ventral surface, especially on tarsomere I.

Aedeagus ( Figs. 17–18 View FIGURES 12 – 18 ) elongate, AeL 0.14 mm, median lobe oval, strongly narrowing from base to subapical region where the distal third of aedeagus is rapidly narrowing and forming slender apical projection; internal armature composed of tubular structures forming an open loop; parameres with broad basal and slender distal parts, each with pointed apex and without setae.

Female. Unknown.

Distribution. Southern Mexico, Chiapas State.

Remarks. In the original description Franz (1994) gives further collecting data: Los Alcanfores (misspelled as "Alcanfones"; a place located west of San Cristóbal de Las Casas), old oak forest, 17.06.1992.

Kingdom

Animalia

Phylum

Arthropoda

Class

Insecta

Order

Coleoptera

Family

Staphylinidae

Genus

Mexiconnus

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