Hydrochus beeneni Makhan 1992: 100
Hydrochus piroei Makhan 1992
Taxonomy of Central American water beetles in the genus Hydrochus Leach, 1817 (Coleoptera: Hydrochidae)
Perkins, Philip D.
Zootaxa
2021
2021-05-21
4974
3
459
503
3N65Y
Makhan
Makhan
2021
[151,502,1086,1113]
Insecta
Hydrochidae
Hydrochus
Animalia
Coleoptera
12
471
Arthropoda
species
beeneni
stat. nov.
Figs. 2, 21, 22, 24, 40
Hydrochus beeneni Makhan 1992: 100 Hydrochus piroei Makhan 1992; Oliva (1996)misidentification (see remarks) Originally described from the Cayman Islands. This is a very commonly collected Central American species; all eight countries are represented in the specimen locality data records given below.
Differential diagnosis.Among Central American species, recognized by the combination of moderate size (ca. 2.76 mm), the densely punctate pronotum, the large and deep anteromedian pronotal fovea, the closely spaced serial elytral punctures, and the male genitalia ( Figs. 10–12; described below). This very common species has a generalized Hydrochushabitus; reliable determinations will require dissection of males. Refer also to the differential diagnosis of H. biexcavatus n. sp.
Redescription. Habitus as illustrated ( Figs. 21, 22). Size: Ca. (length/width, mm): body (length to elytral apices) 2.76/1.04; head width 0.64; pronotum l/w 0.62/0.64; PA 0.64; PB 0.56; elytra 1.76/1.04. Body size moderate (ca. 2.76 mm). Dorsum grey to greenish bronze, with strong to moderately strong iridescence, especially in anteromedian fovea of pronotum, elytra with large black spots. Punctation on elytra ca. 2–3x that of pronotum. Elytra interstriae ca. 1–1.5× strial puncture diameter. Interstria 9 thmore convex than others, overhanging 10 thinterstria. Usual area of callus on 5 thweakly raised, moderately elongate, ca. 7 punctures in row on each side. Pronotum slightly wider than long, widest slightly behind anterior margin, narrowed at base, sides arcuate, smooth; anterior margin slightly bisinuate; rather uniformly densely punctate, except less dense in anteromedian fovea; depressions moderately deep, anteromedian deepest. Elytra with spaces between strial punctures narrow walls to ca. 0.5x their diameter; apices rather sharply conjointly rounded in dorsal view, in lateral view outer margin with slight angulation. Ventral characters: Mentum densely punctate, with median fovea. Submentum with two foveae. Legs testaceous, femora darker than tibiae. Male genitalia ( Figs. 21, 22, 24) general characters: paramere tips slender and pointed, much narrower in lateral view than in dorsal/ventral views, in dorsal/ventral views with medial margins at apex parallel or nearly so, then arcuate away from midline; aedeagus slender in dorsal and ventral views; in lateral view slightly wider; lateral margins of aedeagus sclerotized; basal piece shorter than parameres, orifice strongly sclerotized. Dorsal surface: pdmm proximal to paramere tips parallel or nearly so, overlapping margin of aedeagus; adbl large; adtl near distal end; each paramere with sclerotized ridge as illustrated ( Figs. 10, 11). Ventral surface: pvmm more widely separated than pdmm, approximating lateral margin of aedeagus.
Material examined (258): Belize: Stann Creek, Kendal; ex side pool of Sittee Riverat bridge, 1.v.1987, leg. Spangler& Faitoute(7 NMNH); Stann Creek, Sittee Point; Possum Point Biol. Sta., 23.iv.1987, leg. P. J. Spangler& R. A. Faitoute(25 NMNH); same locality, 24.iv.1987, leg. P. J. Spangler& R. A. Faitoute(10 NMNH); same locality, 25.iv.1987, leg. P. J. Spangler& R. A. Faitoute(2 NMNH); Stann Creek, Sittee Point; Sittee River, 8 kmupstream from Possum Point Biol. Sta., 22.iv.1987, leg. Spangler& Faitoute(54 NMNH); Belize Dist., Hattieville, 7-8.vii.1968, leg. W. L. Hasse(1 CNC, 2 NMNH); Cayo, Western Highway Mile66, 5.vii.1969, leg. W. & D. Hasse(6 NMNH); Orange Walk Dist., Rio Bravo Pres., black lights, 1.i.1996, leg. W. D. Shepard(3 NMW). Costa Rica: Port Limon, 9.v.1929, leg. Darlingon(1 MCZ); Alajuela, Cano Negro, 24.viii.1998, leg. Drechsel(2 NMW); Puntarenas, Roadsidepools; 7.9 kmSE of La Palma; Osa Pensla., elev. 34 m( 8°36.07’N, 83°25.95’W), 18.vi.2003, leg. A. E. Z. Short(1 SEMC). El Salvador: Zacatecoluca, 1.viii.1965, leg. Paul J. Spangler(1 NMNH). Guatemala: Izabal, Finca Bello Horizonteca 8 kmSE of Rio Dulce, elev. 43 m( 15°35’33.07’’N, 88°56’37.18’’W), 11.iii.2017, leg. R. S. Zack(5 WSU); Peten, Parque National Ixpanpajul, Rt.CA-13, near Santa Ana, elev. 188 m( 16°52.439’N, 89°48.652’), 11.ix.2009, leg. R. S. Zack(3 WSU); Parque National Yaxha, ENE El Remate, elev. 167 m( 17°4’1.99’’N, 89°24’.72’’W), 13.iii.2017, leg. R. S. Zack(13 WSU). Honduras: Corozal Town, 29.viii.1967, leg. G. & R. Lacy(2 NMNH); SanMarcus Colon, 28.vii.1965, leg. Paul J. Spangler(1 NMNH); Cortes, 24 mi.S. SanPedro Sula, 19.vi.1974, leg. M. E. and P. D. Perkins(1 MCZ); LaLima, 3.vi.1964, leg. Blanton, Broce, & Woodruff(23 NMNH). Mexico: Campeche, 21 mi.E. Campeche, 27.vii.1964, leg. Paul J. Spangler(5 NMNH); Escarcega, 18.v.1962, leg. F. IslasS. (4 NMNH); Chiapas, 3 mi. N. Tapilula, 27.v.1974, leg. M. E. & P. D. Perkins(1 SEMC); Nayarit, SanBlas, 12-14.vii.1960, leg. R. B. Loomis, J. Maris(5 CAS); same locality, 14.vii.1960, leg. R. B. Loomis, J. Maris(1 MCZ); Oaxaca, Tapanatepec, 23.viii.1965, leg. P. J. Spangler(1 NMNH); Quintana Roo, Km146 carr Chetumal - Cancun, 3.v.1982, leg. V. Melendez(1 UNAM); Sonora, Cd. Obregon, 9.viii.1960, leg. W. W. Gibson(2 MCZ); Tabasco, 23 mi. N. Villahermosa, 6.viii.1964, leg. Paul J. Spangler(34 NMNH); Frontera, 23.vi.1969, leg. Bright& Campbell(1 NMNH); Mpio. Cdentla Rio Gonzalez Est.4 Lagura Juliva, ( 18°20.757’N, 92°58.213’W), 27.iii.1998, leg. Bueno, Barba(1 UNAM); Rio Carrizal2nd Secc. Rancheria Platanos( Estanque), 10.vi.1996, leg. J. Bueno, A. Contreres, R. Barba(1 UNAM); Rio Carrizal Desv. Reforma Km234, 8.vi.1996, leg. J. Bueno, A. Contreres, R. Barba(7 UNAM); Rio Carrizal Est. No.5, ( 17°58.21’N, 93°8.65’W), 10.vi.1996, leg. J. Bueno, A. Contreres, R. Barba(1 UNAM); Rio Samaria, Est.4 (estanque), ( 18°.78’N, 93°4.75’W), 13.vi.1996, leg. Bueno, Santiago, Barba, Contreras(1 UNAM); Teapa, 25.v.1974, leg. M. E. & P. D. Perkins(12 MCZ); Villahermosa, 25.vii.1964, leg. Paul J. Spangler(1 NMNH); Veracruz, 25 mi. S. Acayucan, 4.vii.1965, leg. Paul J. Spangler(1 NMNH); 8 Mi.NE Panuco, 28.viii.1965, leg. P. J. Spangler(2 NMNH); Acayucan, 4.vii.1965, leg. Paul J. Spangler(1 NMNH); Sn. Jose Las Choapas Est.7 Rio Tonala(vias del tren), ( 17°52.288’N, 94°5.042’), 24.iii.1998, leg. J. Bueno, R. Barba(1 UNAM). Nicaragua: Carazo, Rio Casares, elev. 110 m( 11°42’57.3’’N, 86°13’6.97’’W), 12.i.2013, leg. M. Brojer(1 NMW); Matagalpa, Matagalpa, km 77.6 Panam Highway, Rdsidepool, elev. 393 m, 4.viii.2002, leg. W. D. Shepard(2 SEMC); Rio San Juan, 60 kmSE San Carlos, Refugio Bartola, ex. mercury vapor/UV light, elev. 100 m( 10°58.4’N, 84°20.3’W), 30.v.2002, leg. R. Brooks, Z. Falin, S. Chatzimanolis(5 SEMC); Rivas, Res Sil Pr Domitila, UVlights, elev. 122 m, 5-9.vi.2005, leg. W. D. Shepard(1 SEMC). Panama: Bocas del Toro, nr. Miramar, car-net between -82.30/+8.95 -81.19/+9.04, 24.vii.2014, leg. T. Struyve(1 HMNH). Male genitalia ( Figs. 21, 22). General characters: paramere tips slender and pointed, much narrower in lateral view than in dorsal/ventral views, in dorsal/ventral views with medial margins at apex parallel or nearly so, then arcuate away from midline; aedeagus slender in dorsal and ventral views; in lateral view slightly wider, dorsal surface with angulation where adbl and shaft join; lateral margins of aedeagus sclerotized; basal piece shorter than parameres, orifice strongly sclerotized. Dorsal surface: pdmm proximal to paramere tips parallel or nearly so, overlapping margin of aedeagus; adbl large; adtl near distal end; each paramere with sclerotized ridge as illustrated ( Fig. 10). Ventral surface: pvmm more widely separated than pdmm, approximating lateral margin of aedeagus.
Remarks. Oliva (1996)synonymized H. beeneniMakhanwith H. piroeiMakhan. Thisproposed synonymy is incorrect. I have examined the holotype, including the holotypemale genitalia of H. beeneni(RBINS). The male genitalia of the two species distinctly differ; see figure and detailed description of H. piroeimale genitalia in Perkins (2019c). When the holotypespecimen of H. beeneniwas received, the male genitalia was in multiple pieces; these pieces are illustrated herein ( Fig. 24), and the dorsal habitus of the holotypeis also illustrated. The male genitalia illustration in Makhan (1992)is oversimplified, only in one view, misleading, and of little diagnostic value. The specimens imaged herein have the following locality data: ( Fig. 21) Veracruz, 25 mi.S. Acayucan, 4.vii.1965, leg. Paul J. Spangler; ( Fig. 22) Bocas del Toro, nr. Miramar, car-net between -82.30/+8.95 -81.19/+9.04, 24.vii.2014, leg. T. Struyve.
3128194590
1987-05-01
NMNH
Spangler & Faitoute
Belize
Sittee River
Kendal
13
472
1
Stann Creek
3128194492
1987-04-23
NMNH
P. J. Spangler & R. A. Faitoute
Belize
Possum Point Biol
Sittee Point
13
472
1
Stann Creek
3128194328
[509,1366,439,465]
1987-04-24
NMNH
P. J. Spangler & R. A. Faitoute
Belize
Possum Point Biol
Sittee Point
13
472
1
Stann Creek
3128194374
1987-04-25
NMNH
P. J. Spangler & R. A. Faitoute
Belize
Possum Point Biol
Sittee Point
13
472
1
Stann Creek
3128194376
1987-04-22
NMNH
Spangler & Faitoute
Belize
Sittee River
Sittee Point
13
472
1
Stann Creek
3128194516
1968-07-07
1968-07-08
1968-07-07
CNC, NMNH
W. L. Hasse
Belize
Hattieville
13
472
1
Belize
3128194405
1969-07-05
NMNH
W. & D. Hasse
Belize
Western Highway Mile
13
472
1
Cayo
3128194340
[430,1433,583,609]
1996-01-01
NMW
W. D. Shepard
Belize
Rio Bravo Pres.
13
472
1
Orange Walk
3128194485
[151,345,618,645]
Port
Costa Rica
Costa Rica
13
472
1
3128194577
[353,831,619,645]
1929-05-09
MCZ
Darlingon
Costa Rica
Limon
13
472
1
Limon
3128194569
1998-08-24
NMW
Drechsel
Costa Rica
Cano Negro
13
472
1
Alajuela
3128194584
2003-06-18
SEMC
A. E. Z. Short
Costa Rica
34
8.601167
Osa Pensla.
13
-83.4325
Roadside
13
472
1
Puntarenas
3128194367
[621,1433,690,717]
1965-08-01
NMNH
Paul J. Spangler
El Salvador
Zacatecoluca
13
472
1
3128194361
2017-03-11
WSU
R. S. Zack
Guatemala
43
15.592519
Finca Bello Horizonte
1
-88.943665
13
472
1
Izabal
3128194536
2009-09-11
WSU
Parque National Ixpanpajul, Rt. & R. S. Zack
Guatemala
188
16.873983
Santa Ana
13
472
1
Peten
3128194488
2017-03-13
WSU
El Remate & R. S. Zack
Guatemala
167
17.06722
Parque National Yaxha
13
472
1
3128194463
1967-08-29
NMNH
G. & R. Lacy
Honduras
Corozal Town
13
472
1
3128194307
[512,1260,870,897]
1965-07-28
NMNH
Paul J. Spangler
Honduras
San
13
472
1
3128194354
1974-06-19
MCZ
M. E. and P. D. Perkins
Honduras
San
13
472
1
Cortes
3128194436
1964-06-03
NMNH
Blanton & Broce & Woodruff
Honduras
La
13
472
1
3128194309
[425,766,942,969]
Mexico
Campeche
13
472
1
Campeche
3128194459
[779,1432,942,969]
1964-07-27
NMNH
Paul J. Spangler
Mexico
Campeche
13
472
1
Campeche
3128194334
[151,697,979,1005]
1962-05-18
NMNH
F. Islas
Mexico
Escarcega
13
472
1
3128194484
1974-05-27
SEMC
M. E. & P. D. Perkins
Mexico
Chiapas
13
472
1
Chiapas
3128194598
[282,1081,1014,1041]
1960-07-12
1960-07-14
1960-07-12
CAS
R. B. Loomis & J. Maris
Mexico
San
13
472
1
Nayarit
3128194483
1960-07-14
1960-07-14
1960-07-12
MCZ
R. B. Loomis & J. Maris
Mexico
San
13
472
1
Nayarit
3128194316
[528,1262,1050,1077]
1965-08-23
NMNH
P. J. Spangler
Mexico
Tapanatepec
13
472
1
Oaxaca
3128194301
1982-05-03
UNAM
V. Melendez
Mexico
Chetumal - Cancun
Km
13
472
1
Quintana Roo
3128194554
1960-08-09
MCZ
Cd. Obregon & W. W. Gibson
Mexico
Sonora
13
472
1
Sonora
3128194371
[429,1323,1123,1149]
1964-08-06
NMNH
N. Villahermosa & Paul J. Spangler
Mexico
Tabasco
13
472
1
Tabasco
3128194432
1969-06-23
NMNH
Bright & Campbell
Mexico
Frontera
13
472
1
3128194454
1998-03-27
UNAM
Bueno & Barba
Mexico
18.34595
Lagura Juliva
1
-92.970215
Rio Gonzalez Est.
13
472
1
3128194455
1996-06-10
UNAM
J. Bueno & A. Contreres & R. Barba
Mexico
Rio Carrizal
Estanque
Secc. Rancheria Platanos
13
472
1
3128194531
1996-06-08
UNAM
J. Bueno & A. Contreres & R. Barba
Mexico
Rio Carrizal Desv. Reforma Km
13
472
1
3128194507
1996-06-10
UNAM
J. Bueno & A. Contreres & R. Barba
Mexico
17.970167
Rio Carrizal Est. No.
13
-93.144165
13
472
1
3128194394
1996-06-13
UNAM
Bueno & Santiago & Barba & Contreras
Mexico
Est.
-93.07917
Rio Samaria
13
472
1
3128194580
[737,1362,1338,1365]
1974-05-25
MCZ
M. E. & P. D. Perkins
Mexico
Teapa
13
472
1
3128194313
1964-07-25
NMNH
Paul J. Spangler
Mexico
Villahermosa
13
472
1
3128194409
1965-07-04
NMNH
S. Acayucan & Paul J. Spangler
Mexico
Veracruz
13
472
1
Veracruz de Ignacio de la Llave
3128194341
[344,1046,1410,1437]
1965-08-28
NMNH
P. J. Spangler
Mexico
Panuco
Mi.
13
472
1
3128194496
1965-07-04
NMNH
Paul J. Spangler
Mexico
Acayucan
13
472
1
3128194539
1998-03-24
UNAM
J. Bueno & R. Barba
Mexico
17.871468
Rio Tonala
13
472
1
3128194452
2013-01-12
NMW
M. Brojer
Nicaragua
110
11.715917
Rio Casares
1
-86.218605
13
472
1
Carazo
3128194437
2002-08-04
SEMC
W. D. Shepard
Nicaragua
393
Rdside
Panam Highway
13
472
1
Matagalpa
3128194384
2002-05-30
SEMC
R. Brooks & Z. Falin & S. Chatzimanolis
Nicaragua
100
10.973333
Refugio Bartola
129
-84.33833
13
472
1
Rio San Juan
3128194471
[151,1204,1626,1653]
2005-06-05
2005-06-09
2005-06-05
SEMC
Res Sil Pr Domitila, UV & W. D. Shepard
Nicaragua
122
Rivas
13
472
1
Rivas
3128194512
2014-07-24
HMNH
T. Struyve
Panama
Miramar
13
472
1
Bocas del Toro