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95 results for “Mecodema”
FIGURE 26 in Revision of the Mecodema curvidens species group (Coleoptera: Carabidae: Broscini)
FIGURE 26. The similarities in the shape (dorsal view) of the central spicule can be seen in these two closely related species (a) M. haunoho (Little Barrier Is.) and (b) M. aoteanoho (Great Barrier Is.). The central spicule on the right is at a slightly different angle, however, the widening (black arrows) of the spicule can be seen. The difference between the two species is in the curvature of the internal lateral edge (white arrows).
FIGURE 25a. A in Revision of the Mecodema curvidens species group (Coleoptera: Carabidae: Broscini)
FIGURE 25a. A detail of Northland showing the distribution of species in the Northern complex, all of which are new species, except M. regulus (Three Kings Islands) described by Britton (1964).
FIGURE 24 in Revision of the Mecodema curvidens species group (Coleoptera: Carabidae: Broscini)
FIGURE 24. Three illustrations showing the different states of microsculpture on the vertex and frons: (a) the absence of cuticular microsculpture on the frons and vertex (curvidens group); (b) the presence of cuticular microsculpture on the frons and vertex (Mecodema ingroups); (c) represents the outgoup Oregus (scale bar = 3 mm).
FIGURE 25. A in Revision of the Mecodema curvidens species group (Coleoptera: Carabidae: Broscini)
FIGURE 25. A map of New Zealand showing the distribution of species from the Mecodema curvidens group. Species are distributed in three main complexes: Northern = north of Auckland (see fig. 25a); Central = Coromandel, Bay of Plenty and Central Plateau; Southern = Hawke's Bay south to Banks Peninsula (South Island).
FIGURE 23 in Revision of the Mecodema curvidens species group (Coleoptera: Carabidae: Broscini)
FIGURE 23. The differences in the shape of the apex of the central (tooth) spicule (dorsal view) between the genera Oregus (a & b) and Mecodema (c–f) can be seen in these pictures. The genus Oregus (outgroup) has two central spicules: (a) the ventral one forms a pointed spike (black arrow) below the anterior part of the rounded dorsal spicule (white arrow). The setose flanges (b) can be seen attached to the base of the spicule and the left flange is larger than the right flange in Oregus. Whereas, in the genus Mecodema (d) there is a single central spicule (black arrow) and the (e) left setose flange is smaller (white arrow) than the right flange (black arrow). The same structures are marked for M. infimate (f), central spicule (black arrow) and left setose flange (white arrow), the right setose flange is absent.
FIGURE 22 in Revision of the Mecodema curvidens species group (Coleoptera: Carabidae: Broscini)
FIGURE 22. Two illustrations of the posterior / lateral area of the protibia that show the differences in form between the genera: (a) Mecodema and (b) Oregus. All species within the genus Mecodema have a concave posterolateral area (pla), an extension of the dorsal apical area forms a pointed process (dap), and the claw inward of the cleaning organ has a flattened extension dorsally that is possibly a protective structure for the fine setae of the cleaning organ. The species of the genus Oregus have a relatively flat posterolateral area, the dorsoapical process is absent, and the cleaning organ claw is without the dorsal flattened extension (scale bars = 1 mm).
FIGURE 13 in Revision of the Mecodema curvidens species group (Coleoptera: Carabidae: Broscini)
FIGURE 13. Shows the different states of transverse striations on the gena and gula areas of the ventral headcapsule: (a) absent (M. ponaiti); (b) rugose (M. parataiko); (c) corrugate (M. costellum) (scale bars = 1 mm).
FIGURE 8 in Revision of the Mecodema curvidens species group (Coleoptera: Carabidae: Broscini)
FIGURE 8. The three character states through the cross section profile of the pronotum are shown: (a) broad and flat; (b) broad and convex (steep-sided); (c) highly convex.
FIGURE 1 in Revision of the Mecodema curvidens species group (Coleoptera: Carabidae: Broscini)
FIGURE 1. Illustration of the posterior-ventral headcapsule of Mecodema showing the main structures of the mentum, submentum and gula (scale bar = 1 mm).
FIGURE 4 in Revision of the Mecodema curvidens species group (Coleoptera: Carabidae: Broscini)
FIGURE 4. An Environmental Scanning Electron Microscope (ESEM) picture of the apical plate of M. haunoho showing the four structures: The central spicule (tooth) (c.s) is consistent in form within a species but may vary greatly among species. The left (l.s.f) and right setose flanges (r.s.f) are consistent throughout the genus Mecodema and although they may vary slightly in size among species, the right setose flange is always larger than the left. The microtrichial field (m.f) is the main body of the apical plate and may be twisted and folded beneath and anterior to the central spicule. The base of the setose flanges and central spicule are not visible in this picture.
FIGURE 12 in Revision of the Mecodema curvidens species group (Coleoptera: Carabidae: Broscini)
FIGURE 12. Lateral views of the left and right parameres illustrating the different forms of the main body of the left paramere. (a) an ovate main body form (M. manaia); (b) a triangular main body form (M. pluto); (c) a square-shaped main body (M. curvidens); (d) a semi-circular shaped main body (Oregus sp.); (e) M. costellum shows a thin right paramere (bottom) in comparison to the left paramere (scale bars = 1 mm).
FIGURE 21 in Revision of the Mecodema curvidens species group (Coleoptera: Carabidae: Broscini)
FIGURE 21. Illustrations showing the relative strength of the vertical right twist of the apical portion of the ventral edge of the aedeagus. There are three states of this character which can be seen in the drawings above: (a) strong twist (M. regulus); (b) moderate twist (M. haunoho); (c) absent (M. oregoides) (scale bars = 1 mm).
FIGURE 17 in Revision of the Mecodema curvidens species group (Coleoptera: Carabidae: Broscini)
FIGURE 17. Three habitus illustrations (Courtesy: Fauna of New Zealand series) showing the states of character 37: the distribution of asetose punctures of the elytral striae (striae indicated with an arrow): (a) regular (M. curvidens); (b) confused (Oregus sp.); (c) laterally striate (M. ducale).
FIGURE 3 in Revision of the Mecodema curvidens species group (Coleoptera: Carabidae: Broscini)
FIGURE 3. Lateral view of the aedeagus with the endophallus everted to reveal the scleritised structures. The structures of the x-sclerite are visible (dotted lines) to the right of the y-sclerite, which covers the relatively delicate structures of the apical plate. The central tooth is referred to as the central spicule in the text and other figure descriptions.
FIGURE 11 in Revision of the Mecodema curvidens species group (Coleoptera: Carabidae: Broscini)
FIGURE 11. Shows the strength of the internal lateral curve (the curve on the right with scale bar) of the aedeagus: (a) slight arc (M. sulcatum); (b) moderate arc (M. ponaiti); (c) strong arc (M. manaia) (scale bars = 1 mm).
FIGURE 20 in Revision of the Mecodema curvidens species group (Coleoptera: Carabidae: Broscini)
FIGURE 20. These illustrations show the extent of setation along the ventral edge of the left paramere: (a) setation along the apical ¾ (M. regulus); (b) setation along the apical ½ (M. tenaki); (c) setation that is sparse along entire arm (M. sulcatum); (d) setation at the apex only (M. oregoides); (e). setation is absent (Oregus sp.) (scale bars = 1 mm).
FIGURE 10. A in Revision of the Mecodema curvidens species group (Coleoptera: Carabidae: Broscini)
FIGURE 10. A series of pronotum illustrations showing a variety of different characters and their states: (a) crenulation of prothoracic carina absent and carina extends beyond anterior angle; (b) crenulation of prothoracic carina present and carina extends to anterior angle; (c) sinuation of posterior constriction highly angled inward (M. regulus); (d) sinuation of posterior constriction is slightly angled inward (M. tenaki); (e) sinuation of posterior constriction parallel or angled outward (M. curvidens) (scale bars = 5 mm).
FIGURE 9. Four pronotums showing a in Revision of the Mecodema curvidens species group (Coleoptera: Carabidae: Broscini)
FIGURE 9. Four pronotums showing a variety of characters and their states: (a) presence of cuticular microsculpture and depressions; fovea broad and deep; prothoracic carina, broad; posterior edge, straight (Mecodema laterale); (b) absence of cuticular microsculpture and depressions; fovea narrow and shallow; posterior edge, curved (M. ponaiti); (c) fovea poorly defined; prothoracic carina, narrow (M. oblongum); (d) fovea absent (Oregus sp.) (scale bars = 5 mm).
FIGURE 15 in Revision of the Mecodema curvidens species group (Coleoptera: Carabidae: Broscini)
FIGURE 15. Two ESEM pictures showing the difference in forms of the apex of the central spicule: (a) greatly expanded and (b) not greatly expanded.
FIGURE 14 in Revision of the Mecodema curvidens species group (Coleoptera: Carabidae: Broscini)
FIGURE 14. The four states of the microsculpture on the anterior area (dotted circle) of the clypeus: (a) absent (M. oregoides); (b) spatulate (M. manaia); (c) sulcate (M. aoteanoho); (d) poorly defined (M. parataiko) (scale bars = 5 mm).
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