Mecodema antarctica Castelnau 1867, comb. n.
Mecodema antarctica Castelnau, 1867, comb. n. Figure 17. Brullea antarctica Castelnau, 1867. Diagnosis: Mecodema antarctica is distinguishable from all other North Island Mecodema species by having: 1, greatly expanded protibia and mesotibia; 2, ventrites with numerous setose punctured; 3, pronotum...
| Main Authors: | , |
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| Format: | Other/Unknown Material |
| Language: | unknown |
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2019
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| Online Access: | https://zenodo.org/record/5678357 https://doi.org/10.5281/zenodo.5678357 |
| Summary: | Mecodema antarctica Castelnau, 1867, comb. n. Figure 17. Brullea antarctica Castelnau, 1867. Diagnosis: Mecodema antarctica is distinguishable from all other North Island Mecodema species by having: 1, greatly expanded protibia and mesotibia; 2, ventrites with numerous setose punctured; 3, pronotum and elytra truncated; all adaptations for a psammaphilous lifestyle. Description: Length 20–28 mm, pronotal width 6.5–8.3 mm, elytral width 7.7–9.9 mm. Colour of entire body deep reddish-bronze to glossy black. Head: Narrow and convex laterally (Fig. 14D). Vertex smooth, some very fine transverse wrinkles may be present laterally (Fig. 17); vertexal groove defined by broad and shallow depressions laterally, otherwise smooth; small supraorbital punctures bearing 2 setae; a single shallow supraorbital groove in front of eye, a few very small wrinkles mesad eye may be present; frons smooth; frontoclypeal suture a very narrow groove, very small tentorial pits; anterior area of clypeus with a very shallow depression each side of midline; clypeus with 1 setose puncture laterally, bearing a single seta. Labrum rectangular, laterally rounded with anterior edge straight to slightly outwardly curved with 2 proximate central setae, 2 setae each side evenly spaced. Mentum lobes squared, median process very short and broad, upward angle absent, deeply indentate (Fig. 12A); setose punctures variably present or absent. Submentum sclerite constriction narrow with 6 setose punctures evenly spaced. Stipes with 2 basal setae. Gula pits small in deep recess, suture very narrow (difficult to define on darker specimens), gula flat and smooth. Gena with a very fine isodiametric pattern laterally. Prothorax: Prothoracic carina narrow the entire length, smooth to weakly crenulated with 3–4 setae each side (Fig. 17), extended beyond anterior angle; posterior lateral sinuation indistinctly carinate, parallel; pronotum broad and rounded laterally, edges angled inward laterally to head forming overall orbicular shape (truncated); midline (Fig. ... |
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