Cissidium triangulum, Darby, Michael, 2019
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publication ID |
https://doi.org/ 10.5852/ejt.2019.512 |
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publication LSID |
urn:lsid:zoobank.org:pub:8DF89CFD-A549-4C69-8FBC-90EC8DEA9A66 |
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DOI |
https://doi.org/10.5281/zenodo.5941284 |
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persistent identifier |
https://treatment.plazi.org/id/A30AC317-C75D-4534-8360-F895711D5285 |
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taxon LSID |
lsid:zoobank.org:act:A30AC317-C75D-4534-8360-F895711D5285 |
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treatment provided by |
Plazi |
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scientific name |
Cissidium triangulum |
| status |
sp. nov. |
Cissidium triangulum View in CoL sp. nov.
urn:lsid:zoobank.org:act:A30AC317-C75D-4534-8360-F895711D5285
Figs 6F View Fig , 7F View Fig , 8F View Fig , 9B View Fig
Diagnosis
The triangular shape of the mentum distinguishes this species from all others.
Etymology
Refers to the form of the mentum.
Type material
Holotype MALAYSIA-BORNEO • Sarawak, Mulu ; Mar. 1978; N.M. Collins leg.; pitfalls in alluvial forest; BMNH.
Paratypes
MALAYSIA-BORNEO • 1 spec.; same data as for holotype but 13 Mar. 1978; BMNH • 1 spec.; Sarawak, 4 th division, Gunung Mulu National Park ; May–Aug. 1978; P.M. Hammond and J.E. Marshall leg., BM 1978-49 ; base comp litter around long house; BMNH .
Description
SIZE. Habitus ( Fig. 6F View Fig ), length 0.79 mm.
COLOUR. Elytra dark brown, pronotum and head yellow brown, antennae, legs, dorsal surface covered with long yellow pubescence.
HEAD. Distance across eyes 0.22 mm; antennomeres III–XI, length 0.31 mm; mentum triangular the anterior margin much longer than the basal, stipes also triangular, broadest at base ( Fig. 9B View Fig ).
PRONOTUM. Length 0.19 mm, width 0.28 mm, shallowly foveolate, sides straight before right angled hind angles, disc without pubescence ( Fig. 7F View Fig ).
ELYTRA. Length 0.41 mm, width 0.34 mm, pubescent, shallowly foveolate, sides evenly rounded, broadest before middle.
VENTRUM. Mesoventrum without pubescence, collar extending onto humeri without a terminal tooth, lateral margins almost straight before turning to meet mesocoxae, keel becoming rugose before narrowing to a point between the mesocoxae ( Fig. 8F View Fig ). Metaventrum with scattered pubescence throughout, posterior margin between metacoxae with two sharp points at corners, metacoxae separated by ¼ width of the sclerite.
Remarks
The form of the mentum and the mesoventral characters suggest that this species belongs either to a subgenus of Cissidium or to a separate genus.
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.