A review of the Neotropical genus Diochus ERICHSON, 1840 (Coleoptera: Staphylinidae: Staphylininae)
Irmler, Ulrich
Beiträge Zur Entomologie = Contributions to Entomology
2017
2017-06-30
67
1
1
62
369Z6
ERICHSON, 1839
ERiCHsON
1839
[869,1192,1875,1902]
Insecta
Staphylinidae
Diochus
Animalia
Coleoptera
34
35
Arthropoda
species
nanus
Figs 35A–C, 40I, 45D
Type material examined: female, Lectotype: Columbia, without more data, coll. Moritz( ZMHB). Paralectotype: female, with same data as lectotype ( ZMHB). Fig. 1: Head of Diochus maculicollisshowing measurements to indicate relative length of eyes and posterior divergence of head ( A); Male copulatory organs of D. perplexus( B); inner organs of aedeagus of D. longicornis( C); ejected aedeagus of D. perplexuswithout funnel-like widening of basal duct ( D); aedeagus of D. newtoniwith funnel-like widening of basal duct ( E); female copulatory organs of D. longicornis( F). Additional material examined: Costa Rica: Heredia, 3 km S. Puerto Viejo, OTS-La Selva( 84°01'W, 10°26'N), 100 melevation, 2 females, Sept. 1992, leg. P. Hanson( KNHM); Rd. Barrigones( Osa),> Chacarita(83°15'- 26'W, 8°36'-48'N), 0–250 melevation, pastures, plantages, devastated forest, car net, 1 male, 3 females, 11.12.2012, leg. Schülke& Grünberg(1 MSC, 3 UIC); S Rincon de la Vieja, Rd. Hacienda Guachipilin> Santa Maria(85°20.15'-22.45'W, 10°42.43'-45.10'N), 520–700 melevation, car net, farmland & dry forest, 1 male, 2 females, 4.12.2012, leg. Schülke& Grünberg( UIC); Osa Peninsula, Rd. Bahia Drake> Rincon de Osa(83°29'-40'W, 8°41'-42'N), 0–400 melevation, car net, devastated forest & plantations, 1 male, 2 female, 9.12.2012, leg. Schülke& Grünberg( MSC); Alajuela Prov., Rd. Colonia Puntarenas> Rio Negro(84°46'-57'W, 10°50'-53'N), 40–90 melevation, fincas, meadows, forest remnants, car net, 1 female, 18.12.2013, leg. Schülke Grünberg( MSC); Guanacaste Prov., Nicoya Peninsula, PN Diria, Area Conservacion Tempisce( 85°35.44'W, 10°09.43'N), river bank and old car track, 2 females, 15.12.2013, L.M. Schülke(1 MSC, 1 UIC); Sardinal, 2 females, 23.2.1941, leg. A. Bierig( FMNH); Pearl Island, San Miguel, 2 females, leg. Champion( FMNH); Panama: Colon Prov., Maria Chiquita, composted grasses at beach, 1 male, 5 females, 3.1.1981, leg. W. Suter( FMNH); Colombia: Magdalena, Cañaveral( 73°56'W, 11°19'N), 200 melevation, leaf litter, male, 11.8.1985, leg. J. Longino#708 ( KNHM); Suriname: Marienburg, sweep from grass, female, 19.5.1916, leg. C.B. Williams( BMNH); Saint Thomas: 3 males, 6 females, without additional data, coll. Kraatz( SDEI); without further data, coll. Eppelsheim, 3 males, 9 females(3 FMNH, 9 NMW); same location, 7 females, but leg. v. Eggers( NMW).
Diagnosis: D. nanuscan be separated from the other species of the group by the less widened paramere. The eyes are as large as in D. perplexusand D. parvulus. It can be distinguished from D. parvulusby the unicoloured elytra and from D. perplexusby the deeper microsculpture of the head and the striate microsculpture at the anterior angles of the pronotum.
Description: Length: 2.8 mm. Colouration: light brown to yellowish; abdomen slightly darker brown with posterior margin of abdominal segment lighter; legs and antennae yellow. Figs 2–5: Diochuslongicornis-group: Diochus longicornis( 2), D. tarsalis( 3), D. adisi( 4), D. guianensis( 5); aedeagus ( A), paramere ( B) and antenna ( C); scale bar: A, B: 0.1 mm, C: 0.2 mm. Head: 0.40 mmlong, 0.37 mmwide; eyes slightly prominent; large; temples twice as long as eyes; EL: HL = 0.28; temples slightly divergent posteriad; PW: EW = 1.13; posterior angles widely rounded; posterior margin approximately straight; setiferous punctation moderately deep and dense; wide midline impunctate; adjacent to midline irregular row of three to four punctures; between medial row and eyes two further rows of punctures; postocular area more densely punctate; netlike microsculpture more distinct on clypeus and interocular area; weaker on posterior vertex; surface moderately shiny. Antennae slightly longer than head; first antennomere longer and thicker than following antennomeres; second antennomere two third as long as first; twice as long as wide; third antennomere conical; only slightly longer than wide; following antennomeres rectangular; wider than long; fourth slightly wider than long; eighth and ninth nearly twice as wide as long; all antennomeres pubescent and with apical setae. Pronotum: 0.52 mmlong, 0.43 mmwide; sides approximately parallel; posterior angles widely rounded; posterior and anterior margins nearly semi-circular; lateral margin fine; in dorsal aspect visible in posterior half; setiferous punctation moderately deep and sparse; adjacent to wide impunctate midline with row of three punctures; interstice between anterior pair of punctures one third wider than between posterior pairs of punctures; between inner row and lateral margin few sparse punctures; along lateral margin several punctures; with weak microsculpture in anterior half, surface shiny. Elytra: 0.52 mmlong, 0.55 mmwide; shoulders shortly rounded; sides divergent to posterior angles; posterior margin emarginate; setiferous punctures in irregular rows of six to seven punctures; between suture and lateral margin four rows of punctures; ground-sculpture weak; surface moderately shiny. Abdomen densely pubescent. Aedeagus elongate; seminal vesical two third as long as central lobe; basal inner duct looped; ending in complex sclerotised forceps; paramere slender; apex obtusely angulate; not projecting central lobe; widened shortly in front of bifurcate apex; each process obtusely rounded; outer process with one short seta; inner process with two short setae; shaft with numerous sensillae. Spermatheca 0.25 mmlong, 0.15 mmwide; bursa copulartix in lateral position to coiled duct; coiled duct with irregular approximately oval coils.
ZMHB
Columbia & Moritz
34
35
1
lectotype
ZMHB
Columbia & Moritz
34
35
1
paralectotype
1992-09
KNHM
S. Puerto Viejo & P. Hanson
Costa Rica
100
10.433333
Selva
1298
-84.01667
36
37
2
2
Heredia
2012-11-12
MSC, UIC
Schulke & Grunberg
Costa Rica
Rd. Barrigones
125
Chacarita
Osa
36
37
4
3
1
Heredia
2012-04-12
UIC
S Rincon de la Vieja & Schulke & Grunberg
Costa Rica
610
Santa Maria
Rd. Hacienda Guachipilin
36
37
3
2
1
Heredia
2012-09-12
MSC
Schulke & Grunberg
Costa Rica
Osa Peninsula
200
Rincon de Osa
Rd. Bahia Drake
36
37
3
2
1
Heredia
[384,669,681,705]
Costa Rica
Rd. Colonia
36
37
1
Alajuela
2013-12-18
MSC
Schulke Grunberg
Costa Rica
65
Rio Negro
36
37
1
1
Puntarenas
2013-12-15
MSC, UIC
PN Diria & L. M. Schulke
Costa Rica
10.1571665
Area Conservacion Tempisce
13
-85.59067
Nicoya Peninsula
36
37
2
2
Guanacaste
[189,733,905,929]
1941-02-23
FMNH
A. Bierig
Costa Rica
Sardinal
36
37
2
2
Guanacaste Prov.
FMNH
Champion
Costa Rica
San Miguel
Pearl Island
36
37
2
2
Guanacaste Prov.
1981-01-03
FMNH
W. Suter
Panama
Maria Chiquita
36
37
6
5
1
Colon
1985-11-08
KNHM
J. Longino
Colombia
200
11.316667
Canaveral
1295
-73.933334
36
37
1
Magdalena
1916-05-19
BMNH
C. B. Williams
Suriname
Marienburg
36
37
1
Magdalena
SDEI
Kraatz
Virgin Islands
Saint Thomas
36
37
9
6
3
Magdalena
FMNH, NMW
Eppelsheim
Saint Thomas
36
37
12
9
3
Magdalena
NMW
v. Eggers
Saint Thomas
36
37
7
7
Magdalena