Lymexylidae, Fleming, 1821

Lawrence, John F., 2020, The Australian Lymexylidae (Coleoptera: Tenerionoidea) with one new genus and two genera new to Australia, Zootaxa 4895 (2), pp. 211-238 : 235

publication ID

https://doi.org/ 10.11646/zootaxa.4895.2.3

publication LSID

lsid:zoobank.org:pub:77117CFB-AD8E-4066-819F-FA81D3D589B7

DOI

https://doi.org/10.5281/zenodo.4333471

persistent identifier

https://treatment.plazi.org/id/3735BF36-A010-5D6C-FF46-95D070FCF98B

treatment provided by

Plazi

scientific name

Lymexylidae
status

 

Key to the Genera and Species of Lymexylidae View in CoL View at ENA occurring in Australia

1. Elytra covering abdomen or only slightly shortened; hind wings folded beneath elytra; maxillary palp organ absent or present in male only; antennae much longer than head width and more or less serrate..................... Melittommatinae ... 2

- Elytra very short, brachypterous, not reaching metacoxae and exposing all abdominal segments; hind wings exposed, without transverse folds; male and female with maxillary palp organ; antennae not or barely longer than head width and spindle-shaped (widest sub-basally and narrowing towards apex.............................................. Atractocerinae ... 5

2(1). Pronotum not or only slightly longer than wide, widest anteriorly with anterior edge slightly curved and side margins not extending onto apex; anterior pronotal angles obtuse but distinct; antennomeres 3–10 distinctly widened apically; notosternal suture weakly impressed and diagonal; abdominal segment IX in male with appendiculate paratergites; apicale much shorter than basale, apically emarginate but not completely divided; ovipositor with basal coxital lobes evenly, moderately heavily sclerotised, without bacula and with slender mesal projections extending to apex and separating membranous, densely setose apical lobes.................................................................. Melittomma pervagum (Olliff)

- Pronotum distinctly longer than wide, widest at or behind middle with anterior edge strongly curved and side margins more or less continuous with anterior margin; anterior pronotal angles absent; antennomeres 4–10 distinctly widened apically; notosternal sutures distinct and more or less parallel; abdominal segment IX in male without appendiculate paratergites; apicale subequal to or longer than basale, completely divided or not; ovipositor with basal coxital lobes lightly sclerotised, with distinct bacula and without anteromesal projections................................................................. 3

3(2). Base of pronotum without or with broad, shallow impressions; elytral interlocking mechanism and epipleura more or less complete and abdominal apex usually concealed; scutellum at least slightly convex and separated by transverse ridge from scutum; maxillary palp organ present in male; abdominal sternite VIII in male without setose pads.................................................................................................... Alcestoma queenslandicum sp. nov.

- Base of pronotum with pair of small, relatively deep, sublateral impressions; elytral interlocking mechanism and epipleura incomplete, so that elytra beyond middle lie flat on abdomen with independently rounded apices exposing one or two abdominal tergites; scutellum flat or slightly concave, not separated from scutum; maxillary palp organ absent in both sexes; abdominal sternite VIII in male with pair of setose pads................................................ Australymexylon View in CoL ... 4

4(3). Male antenna strongly serrate; female antenna serrate; penis much shorter than basale and apicale combined; abdominal segment VIII of male with small, round, ventral setose pads; colour almost always with evident pale spot at base of each elytron........................................................................ Australymexylon fuscipennis (Lea)

- Male antenna weakly serrate; female antenna scarcely so; penis as long as basale and apicale combined; abdominal segment VIII of male with large, oval setose pads, covering most of sternite and part of tergite; colour usually uniformly dark, reddishbrown to nearly black..................................................... Australymxylon australe (Erichson)

5 (1). Eyes larger, occupying almost entire frons, separated in frontal view by less than 0.05 times distance across both eyes..... 6

- Eyes smaller, separated in frontal view by at least 0.15 times distance across both eyes.............................. 7

6(5). Head smaller, longer than wide, somewhat horizontally produced, distinctly narrower than pronotum; eyes elongate-oval, their long axis at an angle of about 30º to long axis of head; elytra much shorter than prothorax; northwestern Australia................................................................................... Atractocerus crassicornis Clark

- Head larger, wider than long, rather vertical, at least as wide as anterior edge of pronotum; eyes more diagonal, their long axis at an angle of about 45º to long axis of head; elytra longer than prothorax; southern Australia.................................................................................................... Raractocetus kreusleri (Pascoe)

7 (5). Pronotum subquadrate, not longer than wide; head distinctly declined with vertex somewhat flattened and abruptly declined posteriorly, without median groove; antennae 11-segmented; eyes in frontal view separated by distance about equal to width of one eye in same view; meso- and metatarsi not longer than their respective tibiae; hindwings relatively darkly pigmented, with metallic sheen; northern QLD............................................................... Arractocetus View in CoL sp.

- Pronotum distinctly longer than wide; head less declined with vertex convex, usually with median groove; antennae 12-segmented; eyes in frontal view separated by distance less than 0.7 times width of one eye in same view; meso- and metatarsi much longer than their respective tibiae; hindwings hyaline, without metallic sheen; southern Australia............................................................................................. Leptonetron victoriense (Blackburn)

Kingdom

Animalia

Phylum

Arthropoda

Class

Insecta

Order

Coleoptera

Family

Lymexylidae

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