Pycinus Guillebeau 1893: 289
Pycinus politus Guillebeau, 1893
Ochrodemus Guillebeau 1893: 293
Ochrodemus brevitarsis Guillebeau, 1893
Pycinus
Gimmel (2013: 68)
Radinus Guillebeau 1893: 295
Radinus latus Guillebeau, 1893
Pycinus
Gimmel (2013: 68)
Parasemus Guillebeau 1894: 281
Parasemus grouvellei Guillebeau, 1894
Olibroporus
Gimmel (2013: 61)
Euphalacrus Champion 1925: 608
Euphalacrus crassipes Champion, 1925
Pycinus
Gimmel (2013: 68)
Olibroporus
Pycinus
Pycinus
Pycinus
Olibroporus
Olibroporus
Pycinus
O. punctatus
Olibroporus
Pycinus
O. punctatus
Pycinus
Olibroporus
Taxonomic Notes onOlibroporusCasey andPycinusGuillebeau (Coleoptera: Phalacridae), with Diagnosis and Distribution of the Widespread SpeciesOlibroporus punctatusCasey
Gimmel, Matthew L.
The Coleopterists Bulletin
2017
2017-03-31
71
1
61
73
Casey, 1890
CASEY AND
1890
[744,991,545,566]
Insecta
Phalacridae
Olibroporus
GBIF
Animalia
Coleoptera
1
62
Arthropoda
genus
Pycinus Guillebeau 1893: 289. Typespecies: Pycinus politus Guillebeau, 1893, fixed by subsequent designation. New synonymy. Ochrodemus Guillebeau 1893: 293. Typespecies: Ochrodemus brevitarsis Guillebeau, 1893, fixed by monotypy. Synonymized with Pycinusby Gimmel (2013: 68). Radinus Guillebeau 1893: 295. Typespecies: Radinus latus Guillebeau, 1893, fixed by monotypy. Synonymized with Pycinusby Gimmel (2013: 68). Parasemus Guillebeau 1894: 281. Typespecies: Parasemus grouvellei Guillebeau, 1894, fixed by original designation. Synonymized with Olibroporusby Gimmel (2013: 61). Euphalacrus Champion 1925: 608. Typespecies: Euphalacrus crassipes Champion, 1925, fixed by original designation. Synonymized with Pycinusby Gimmel (2013: 68). Notes.In light of examination of additional members of Olibroporusand Pycinusfrom the Neotropics, I have concluded that the diagnoses of these two genera outlined in Gimmel (2013)are untenable since some specimens possess a mix of characters. Previously, I distinguished Pycinusby the presence of a ventral ridge on the mandible, lack of abdominal calli (in species so far examined), absence of strong microsculpture and presence of spectral iridescence on the elytra, extremely densely setose prosternum medially, and the more robust antennal club. Additionally, males of many species of Pycinushave an enlarged second protarsomere. However, I examined intermediate specimens ( Brazil: Nova Teutonia, 27°11′S, 52°23′W, 300–500 m, Fritz Plaumann, December 1972[AMNH]) with strong microsculpture (and no spectral iridescence), an extremely densely setose prosternum, and a robust antennal club with an emarginate terminal antennomere. A dissected male specimen from Brazilformed the original basis for my assertion that a second species of the restricted concept of Olibroporusoccurred in the New World ( Gimmel 2013: 63). The only totally consistent character observed that separates the two previous concepts of Olibroporusand Pycinusis the reduced amount of setae on the prosternum in the former. Therefore, I consider these two generic concepts to grade into one another and see no reason to arbitrarily maintain a generic distinction for O. punctatusalone. Additionally, the species in question share some highly specific character states, which are illustrated here for the first time using scanning electron microscopy. These are the presence of comb-like grooves on the elytra ( Fig. 13; also shared with three other genera, see Discussion below) and a unique shape of the mesoventral plate ( Fig. 15). An additional unique putative synapomorphy is the bidentate condition of the mandibles with a row of short blunt teeth on the dorsal cutting edge, further reinforcing the status of Olibroporus+ Pycinusas a cohesive group. In the morphological phylogenetic analysis of Gimmel (2013), O. punctatusand two representatives of Pycinuswere placed in a polytomy along with other members of the “ Olibroporus-group”. A molecular phylogenetic study will be necessary to accurately assess relationships within this genus.
Olibroporus sensu novonow possesses 13 valid species, all distributed in the Neotropical region, with only O. punctatusextending into the Nearctic region. A few synonyms probably exist among these names, and new species have been seen. In particular, I have examined a form that seems to belong to this genus but possesses an antennal club of five antennomeres ( Brazil; BMNH), and at least one other with a flattened body and testaceous coloration (widely distributed in the Neotropics).
Diagnosis.Adult members of this genus may be recognized by the combination of lack of a ctenidium on the outer edge of the protibia; metaventral process not protruding anterior of the mesocoxae ( Figs. 15, 24–26); metaventral postcoxal lines not separated from coxal cavities ( Fig. 16); small scutellar shield (width at base less than diameter of eye); metatarsomere I shorter than II ( Fig. 17); mandible with apex bidentate (and with a dorsal row of small, blunt teeth); and elytra with a single sutural stria ( Fig. 11) and either strong microsculpture ( Fig. 12) or spectral iridescence. Another important character, which is quite difficult to observe in dry specimens with a light microscope, is the disposition of the “mesoventral plate” (central part of the mesoventrite delimited by strong sutures), whose lateral sutures bend abruptly laterad just before reaching the margin of the mesocoxal cavity and trace the anterior border of the meso- coxa, without connecting to the cavity or any suture ( Fig. 15; see also line drawings in Gimmel 2013: figs. 17f, 19f). This state is unique to Olibroporus. Other members of the Olibroporus- group ( Austroporus, Platyphalacrus) also possess incomplete lateral sutures of the mesoventral plate, but these evanesce in the middle of the mesoventrite (see Gimmel 2013: figs. 16f, 18f). One character shared by all members of the genus is the transverse band of grooves near the basal margin of the elytron (see Discussion for elaboration of this structure). A complete redescription of the new concept of Olibroporuswill be presented in a future contribution along with a revision of the species. CHECKLIST OF THE SPECIES OF THE GENUS OLIBROPORUS(original genus in parentheses) Olibroporus brevitarsis( Guillebeau, 1893), new combination( Ochrodemus) [ Venezuela] Olibroporus crassipes( Champion, 1925), new combination( Euphalacrus) [ Brazil] Olibroporus guatemalenus(Sharp, 1888), new combination( Olibrus) [ Guatemala, Panama] Olibroporus hemisphaericus( Guillebeau, 1893), new combination( Pycinus) [ Venezuela] Olibroporus latipes(Sharp, 1888), new combination( Olibrus) [ Panama] Olibroporus latus( Guillebeau, 1893), new combination( Radinus) [ Venezuela] Olibroporus microsternus(Sharp, 1888), new combination( Olibrus) [ Panama] Olibroporus politus( Guillebeau, 1893), new combination( Pycinus) [ Venezuela] Olibroporus punctatusCasey, 1890[ USAto Brazil] Olibroporus rubiginosus(Sharp, 1888), new combination( Olibrus) [ Guatemala, Mexico] Olibroporus subrotundatus( Guillebeau, 1893), new combination( Pycinus) [ Venezuela] Olibroporus tropicus( Kirsch, 1873), new combination( Phalacrus) [ Colombia] Olibroporus vulgaris(Sharp, 1888), new combination( Olibrus) [ Guatemala]