Scydmaenus (Geoscydmaenus) isaloensis Franz

Jałoszyński, Paweł, 2016, Review of Scydmaenus (Geoscydmaenus) of Madagascar (Coleoptera, Staphylinidae, Scydmaeninae), Zootaxa 4205 (3), pp. 265-274 : 268-271

publication ID

https://doi.org/ 10.11646/zootaxa.4205.3.6

publication LSID

lsid:zoobank.org:pub:66FB30C3-66BC-4D79-9361-03F5C9F22498

DOI

https://doi.org/10.5281/zenodo.6053365

persistent identifier

https://treatment.plazi.org/id/03D7CE3F-344C-F322-A8CF-6480FC65F979

treatment provided by

Plazi

scientific name

Scydmaenus (Geoscydmaenus) isaloensis Franz
status

 

Scydmaenus (Geoscydmaenus) isaloensis Franz View in CoL

( Figs 1, 3–4 View FIGURES 1 – 8 , 11 View FIGURES 9 – 11 , 12, 14 View FIGURES 12 – 15 , 16–18 View FIGURES 16 – 21 , 22–23 View FIGURES 22 – 25 )

Scydmaenus (Geoscydmaenus) isaloensis Franz, 1986: 372 View in CoL , figs 339–341.

Type material. Holotype ( MADAGASCAR): ♂, two labels ( Fig. 1 View FIGURES 1 – 8 ): "S-Madagaskar / Massif de l'Isalo / lg. H.Franz 1969" [white, printed] with " Mg 20" handwritten in blue on the reverse side; Scydmaenus / ( Geoscydmaenus ) / isaloensis m. / det. H.Franz " [white, handwritten and printed]; " ♂ " [white, printed]; " Typus " [red, handwritten] ( NHMW) . Paratypes: 12 exx., same data as for holotype ( NHMW) .

Additional material studied: 16 exx., Madagascar, Isalo N.P., Ananalava forest , 719-741 m, 17-18.i.2013, sifted leaf litter, L.S. Rahanitriniaina & E.M. Rabotoson leg. ; 2 exx., Madagascar, Isalo N.P., Piscine naturelle, 852 m, 21.i.2013, sifted leaf litter, L.S. Rahanitriniaina & E.M. Rabotoson leg. ; 2 exx., Madagascar, Isalo N.P., Oasis forest , 894 m, 20.i.2013, sifted leaf litter, L.S. Rahanitriniaina & E.M. Rabotoson leg. ( MMBC, cPJ).

Revised diagnosis. Head broadest near posterior margin of vertex, strongly narrowing anteriorly; profemur of male with clavate part strongly convex dorsally and ventrally, with long ventral projection located near middle, its apex hook-shaped; protibia of male abruptly broadened distally and slightly but distinctly curved; aedeagus with deeply notched apex, lateral apical lobes distinctly separated at middle.

Redescription. Body of male ( Fig. 3 View FIGURES 1 – 8 ) strongly elongate and slender, strongly flattened, yellowish to light brown and covered with light brown setae; BL 0.76–0.83 mm (mean 0.80 mm).

Head ( Figs 3–4 View FIGURES 1 – 8 ) in dorsal view subtriangular with weakly rounded sides, broadest shortly in front of occipital constriction and strongly narrowing anteriorly, HL 0.13–0.15 mm (mean 0.14 mm), HW 0.15–0.16 mm (mean 0.15 mm); vertex and frons confluent, evenly but weakly convex; supraantennal tubercles feebly marked. Dorsal surface of head covered with shallow but distinct and relatively large punctures distributed mostly on sides of vertex and frons, with much smaller punctures on median area ( Fig. 4 View FIGURES 1 – 8 ), but the size of finely punctate region is variable and in some specimens large punctures occupy nearly entire frons and vertex; setae short and sparse, nearly recumbent. Antennae ( Fig. 12 View FIGURES 12 – 15 ) short, AnL 0.33–0.35 mm (mean 0.34 mm); scape and pedicel strongly elongate, antennomeres III–V each distinctly elongate, VI about as long as broad, VII and VIII distinctly transverse, IX and X about as long as broad, XI about 1.6–1.7× as long as broad.

Pronotum in dorsal view ( Figs 3–4 View FIGURES 1 – 8 ) oval, broadest between middle and anterior third; PL 0.21–0.23 mm (mean 0.22 mm), PW 0.20–0.23 mm (mean 0.21 mm). Punctures on pronotal disc shallow and diffused, inconspicuous; setae short, sparse and nearly recumbent.

Elytra ( Fig. 3 View FIGURES 1 – 8 ) oval and strongly elongate, broadest near anterior third, EL 0.43–0.45 mm (mean 0.44 mm), EW 0.25–0.28 mm (mean 0.27 mm), EI 1.55–1.80. Elytra covered with distinct and dense punctures, which are small and with diffused margins; setae similar to those on pronotum.

Legs ( Figs 3 View FIGURES 1 – 8 , 11 View FIGURES 9 – 11 , 14 View FIGURES 12 – 15 ) relatively short and robust; profemur ( Fig. 14 View FIGURES 12 – 15 ) with large clavate part similarly strongly convex dorsally and ventrally, with ventral submedian projection bearing small apical denticle directed toward trochanter and long seta at base of projection ( Fig. 11 View FIGURES 9 – 11 ); protibia ( Fig. 14 View FIGURES 12 – 15 ) strongly and abruptly thickened slightly distally to middle, and slightly but distinctly curved.

Aedeagus ( Figs 16–18 View FIGURES 16 – 21 , 22–23 View FIGURES 22 – 25 ) elongate, AeL 0.20 mm; median lobe in ventral view with distinctly demarcated apical portion bearing a pair of lateral apical lobes separated at middle by deep notch.

Female. Similar to male, except for distinctly more slender profemora lacking ventral projections and nearly straight and only slightly, gradually thickened protibiae. BL 0.80–0.83 mm (mean 0.81 mm); HL 0.13–0.14 mm (mean 0.13 mm), HW 0.15–0.16 mm (mean 0.15 mm), AnL 0.35 mm; PL 0.20–0.21 mm (mean 0.21 mm), PW 0.18–0.19 mm (mean 0.18 mm); EL 0.43 mm, EW 0.25–0.26 mm (mean 0.26 mm), EI 1.62–1.70.

Distribution. Central-southern Madagascar, Ihorombe Region.

NHMW

Naturhistorisches Museum, Wien

MMBC

Moravske Muzeum [Moravian Museum]

Kingdom

Animalia

Phylum

Arthropoda

Class

Insecta

Order

Coleoptera

Family

Staphylinidae

SubFamily

Scydmaeninae

Genus

Scydmaenus

SubGenus

Geoscydmaenus

Loc

Scydmaenus (Geoscydmaenus) isaloensis Franz

Jałoszyński, Paweł 2016
2016
Loc

Scydmaenus (Geoscydmaenus) isaloensis

Franz 1986: 372
1986
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