Micrillus siamensis, Assing, 2013
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publication ID |
https://doi.org/ 10.5281/zenodo.5301289 |
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DOI |
https://doi.org/10.5281/zenodo.6512330 |
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persistent identifier |
https://treatment.plazi.org/id/1974879E-FFE7-FFCD-FF04-EE0CFE4FFCAC |
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treatment provided by |
Marcus |
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scientific name |
Micrillus siamensis |
| status |
sp. nov. |
Micrillus siamensis View in CoL nov.sp.
( Figs 17-22 View Figs 17-22 , Map 3 View Map 3 )
Type material examined Holotype [apical portions of antennae missing]: " Bangkok / Bangkok / 159 / inconnu au = 158? / Sharp Coll, 1905-313 / Holotypus Micrillus siamensis sp.n., det. V. Assing 2013" ( BMNH).
Etymology: The specific epithet is an adjective derived from Siam, the ancient name of the region where the type locality is situated.
Description: Body length 5.7 mm; length of forebody 3.2 mm. Habitus as in Fig. 17 View Figs 17-22 . Coloration: body reddish; legs and antennae reddish-yellow.
Head ( Fig. 18 View Figs 17-22 ) 1.08 times as long as broad, widest across eyes, narrowed behind eyes; posterior angles rather weakly marked; punctation fine and sparse, somewhat more distinct in lateral and posterior portions; microsculpture very shallow. Eyes somewhat shorter than postocular region in dorsal view. Antennomeres IV-VIII distinctly oblong; VIII nearly twice as long as broad.
Pronotum ( Fig. 18 View Figs 17-22 ) 1.14 times as long as broad and 1.02 times as broad as head; lateral margins subparallel in anterior two fifths and converging in posterior three fifths in dorsal view; posterior margin distinctly concave; punctation extremely fine and very dense.
Elytra ( Fig. 18 View Figs 17-22 ) approximately as long as pronotum; punctation extremely dense and fine; surface almost matt. Hind wings completely developed. Protarsomeres I-IV not dilated. Metatarsomere I nearly as long as the combined length of II-IV.
Abdomen with rather dense and fine punctation; interstices with iridescent microsculpture; posterior margin with palisade fringe.
: sternite VIII ( Fig. 19 View Figs 17-22 ) of similar shape as in M. indicus , with narrow and rather deep posterior incision; aedeagus ( Figs 20-22 View Figs 17-22 ) minute in relation to body size, 0.39 mm long, distinctly asymmetric; apex of ventral process in ventral view with short process on either side and concave in the middle; sclerotized internal structure curved and apically with three finger-shaped processes.
Comparative notes: In general appearance, M. siamensis somewhat resembles M. indicus , to which it is closely related, as can be inferred particularly from the similar male sexual characters (shape of male sternite VIII; minute aedeagus of similar general morphology). It differs, however, by distinctly larger body size, the more oblong head, the finer punctation of the pronotum, and by the shape of the aedeagus.
Distribution: Micrillus siamensis is currently known only from the type locality in Thailand ( Map 3 View Map 3 ).
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.