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Scarabaeoidea of Southern South America Links |
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Scarab Guide Links
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Lichnia Erichson
Lichnia Erichson 1835:269 (valid name).
Dasychaeta Erichson 1847:104. Synonym. |
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Lichnia limbata Erichson male.
Illustration by Dan Schmidt. |
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Map of central Chile showing distribution of
Lichnia gallardoi and L. limbata. |
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Type species:
Lichnia limbata Erichson, 1835 by monotypy. |
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Etymology. The origin of the name Lichnia is unknown, but it possibly comes from the Greek
lichnos, which means dainty (Brown 1956). The gender is feminine. |
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Description.
Male. Length 4.0-8.0 mm; width 2.5-5.0 mm. Color: Head, pronotum, venter, and
legs black; elytral disc testaceous, margin dark brown to black. Head: Head strongly
deflexed. Frons slightly concave. Surface setosely punctate; punctures and setae variable.
Labrum clearly visible in dorsal view, exposed part 2/3 as long as clypeus. Mandibles
protruding anteriorly beyond labrum; apices rounded, strongly reflexed. Maxilla
with galea 1/3 to 3/4 body length, setose; setae curved, short, dense, forming
row, pale yellow to light tan. Maxillary palpi with short, black setae at apex of all segments
except last, 4-segmented: segment 1 small, 1/2 length of 2; 2-3 cylindrical, subequal in
length to each other; 4 fusiform. Labium deeply grooved longitudinally. Labial palpi with
short, black setae at apex of all segments except last, 3-segmented: segments 1-2 conical,
3 fusiform. Eye divided completely into dorsal and ventral sections by canthus; canthus
densely setose, setae variable. Antenna 9-segmented. Pronotum: Surface setosely
punctate, punctures and setae variable. Disc with weak, median, longitudinal groove.
Lateral margins with poorly developed bead, weakly rounded. Posterior margin strongly projected posteriorly at middle. Elytron: Length short, not covering pygidium. Surface
depressed posteriorly, setosely punctate, punctures and setae variable. Propygidium:
Surface exposed, covered with long, dense, white setae; setae overlaying basal 1/4 of
pygidium, apices forming straight row. Pygidium: Surface slightly convex, setosely
punctate, punctures and setae variable. Lateral and apical margin with bead. Apex
rounded. Venter: Abdomen with 7 exposed segments; segments setosely punctate;
punctures and setae variable. Pleural membrane with 8 spiracles. Legs: Surface setosely
punctate, punctures and setae variable. Protibia slender, with 3 outer teeth and 1 inner,
apical tooth. Protibial spur small, 3/4 length of first tarsal segment. Metafemur
broadly expanded. Mesotibia and metatibia expanded apically. Meso- and metatarsomere 1
longer than 2-4, 2-4 subequal to each other, 5 subequal to 2-4. Tarsal claws simple.
Unguitractor plate with sides parallel, with 2 apical setae. Parameres: Figs. 9a-b.
Female. Females differ from males in the following respects: length 5.1-7.4 mm;
width 3.0-4.9 mm. Color: Head, pronotum, venter, and legs reddish brown to black;
elytral disc testaceous to red, margin dark brown to black. Pronotum: Lateral margin
strongly rounded. Elytron: Surface slightly convex, not depressed posteriorly.
Propygidium: Surface setose; setae yellow to yellowish brown, covering 1/3 of pygidium,
not dense, not forming straight row. Pygidium: Apex attenuate. Venter: Apex of terminal
sternite of abdomen deeply emarginate. Legs: Metafemur slightly expanded. Protibia
expanded. Metatibia with sides subparallel, not expanded apically. |
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Diagnosis.
Species of Lichnia are differentiated from species of Arctodium by the
elongated galea in Lichnia that is at least half the length of the entire body.
The galea of Arctodium is also elongated but is less than half the body length. Also, the exposed apex of the mandible of Lichnia is smooth and rounded,
whereas the exposed apex of the mandible of Arctodium is bidentate. |
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Distribution.
Species in the genus Lichnia live in central Chile from Region IV (Coquimbo) to
Region VII (Maule). They are not found above 2000 meters in elevation and are
most abundantly found on a variety of flowers in dry, sandy areas at lower elevations. |
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Remarks.
Gutiérrez (1943) attempted to divide Lichnia into two subgenera (Lichnia and Neolichnia) based on antennal length. However, he did not designate a type species for
Neolichnia in the original publication, and it is therefore a nomen nudum according to
Article 13 of the Code (International Commission on Zoological Nomenclature 1999).
Because each subgenus would now contain only one species, it is unnecessary to use
subgeneric names. For an explanation of the synonymy of Dasychaeta Erichson with
Lichnia Erichson see the remarks section for Lichnia limbata. |
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Excerpt from:
Hawkins, S. J. 2006. A revision of the Chilean tribe Lichniini Burmeister, 1844
(Coleoptera: Scarabaeidae: Melolonthinae). Zootoaxa 1266:1-63. |
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