Hydrochus beeneni Makhan,

Perkins, Philip D., 2021, Taxonomy of Central American water beetles in the genus Hydrochus Leach, 1817 (Coleoptera: Hydrochidae), Zootaxa 4974 (3), pp. 459-503: 471-472

publication ID

https://doi.org/10.11646/zootaxa.4974.3.2

publication LSID

lsid:zoobank.org:pub:1BD6220B-7540-4A12-B3D2-5EDC1A3B7DD8

DOI

http://doi.org/10.5281/zenodo.4919592

persistent identifier

http://treatment.plazi.org/id/4772526A-0046-FFC1-FF18-2926145E319C

treatment provided by

Plazi

scientific name

Hydrochus beeneni Makhan
status

new status

Hydrochus beeneni Makhan  , new status

Figs. 2View FIGURE 2, 21, 22View FIGURES 21–22, 24View FIGURES 23–24, 40View FIGURES 40–42

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. 10–12View FIGURES 9–10View FIGURES 11–12; described below). This very common species has a generalized Hydrochus  habitus; reliable determinations will require dissection of males. Refer also to the differential diagnosis of H. biexcavatus  n. sp.

Redescription. Habitus as illustrated ( Figs. 21, 22View FIGURES 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 th more convex than others, overhanging 10 th interstria. Usual area of callus on 5 th weakly 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, 22View FIGURES 21–22, 24View FIGURES 23–24) 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. 10View FIGURES 9–10, 11View FIGURES 11–12).

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 River at 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 km upstream 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 Mile 66, 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, Roadside pools; 7.9 km SE 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)GoogleMaps  . El Salvador: Zacatecoluca , 1.viii.1965, leg. Paul J. Spangler (1 NMNH)  . Guatemala: Izabal, Finca Bello Horizonte ca 8 km SE 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)GoogleMaps  ; 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)  ; San Marcus Colon, 28.vii.1965, leg. Paul J. Spangler (1 NMNH)  ; Cortes, 24 mi. S. San Pedro Sula, 19.vi.1974, leg. M. E. and P. D. Perkins (1 MCZ)  ; La Lima, 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. Islas S. (4 NMNH)  ; Chiapas, 3 mi. N. Tapilula, 27.v.1974, leg. M. E. & P. D. Perkins (1 SEMC)  ; Nayarit, San Blas, 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, Km 146 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)GoogleMaps  ; Rio Carrizal 2nd Secc. Rancheria Platanos ( Estanque ), 10.vi.1996, leg. J. Bueno, A. Contreres, R. Barba (1 UNAM)  ; Rio Carrizal Desv. Reforma Km 234, 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)GoogleMaps  ; 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)GoogleMaps  ; Matagalpa, Matagalpa, km 77.6 Panam Highway, Rdside pool, elev. 393 m, 4.viii.2002, leg. W. D. Shepard (2 SEMC)  ; Rio San Juan, 60 km SE 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)GoogleMaps  ; Rivas, Res Sil Pr Domitila, UV lights, 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, 22View FIGURES 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. 10View FIGURES 9–10).

Ventral surface: pvmm more widely separated than pdmm, approximating lateral margin of aedeagus.

Remarks. Oliva (1996) synonymized H. beeneni Makhan  with H. piroei Makhan. This  proposed synonymy is incorrect. I have examined the holotype, including the holotype male genitalia of H. beeneni (RBINS)  . The male genitalia of the two species distinctly differ; see figure and detailed description of H. piroei  male genitalia in Perkins (2019c). When the holotype specimen of H. beeneni  was received, the male genitalia was in multiple pieces; these pieces are illustrated herein ( Fig. 24View FIGURES 23–24), and the dorsal habitus of the holotype is 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. 21View FIGURES 21–22) Veracruz, 25 mi. S. Acayucan, 4.vii.1965, leg. Paul J. Spangler; ( Fig. 22View FIGURES 21–22) Bocas del Toro, nr. Miramar, car-net between -82.30/+8.95 -81.19/+9.04, 24.vii.2014, leg. T. Struyve.

NMNH

Smithsonian Institution, National Museum of Natural History

CNC

Canadian National Collection of Insects, Arachnids, and Nematodes

NMW

Naturhistorisches Museum, Wien

MCZ

Museum of Comparative Zoology

SEMC

University of Kansas - Biodiversity Institute

WSU

Weber State University, Bird and Mammal Collection

CAS

California Academy of Sciences

UNAM

Universidad Nacional Autonoma de Mexico

HMNH

Hayashibara Museum of Natural History

Kingdom

Animalia

Phylum

Arthropoda

Class

Insecta

Order

Coleoptera

Family

Hydrochidae

Genus

Hydrochus

Loc

Hydrochus beeneni Makhan

Perkins, Philip D. 2021
2021
Loc

Hydrochus beeneni

Makhan, D. 1992: 100
1992