Chasmogenus cremnobates

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Taxonavigation

Ordo: Coleoptera
Familia: Hydrophilidae
Genus: Chasmogenus

Name

Chasmogenus cremnobates (Spangler, 1979) comb. n. – Wikispecies link – Pensoft Profile

• Dieroxenus cremnobates Spangler, 1979: 754

Type material examined

Holotype: “ECUADOR: Napo, Baeza (72 km E), 16 May 1975, Spangler, Langley, and Cohen” (USNM). Paratypes: ECUADOR: Napo: same data as holotype (44 males; 42 females); Tungurahua: “Baños (35 km E), 29 May 1975, Langley, Cohen, and Monnig (8 males; 6 females); “Baños (18 km E), 25 Jan 1976, Spangler, et al. (15 males; 18 females); “Baños (20 km E), 28 Jan 1976, Spangler, et al. (7 males; 6 females); “Baños (39 km E), 28 Jan 1976, Spangler, et al. (2 females).

Additional material

ECUADOR: Napo: “San Francisco de / Borja 17 Jan 1978/ 1610 m PJ Spangler/ & J. Anderson // seep on stream bank” (6 males, 6 females; USNM).

Key to the genera of New World Acidocerinae

Key to the genera of New World Acidocerinae — J. Girón , A. Short

1		Eyes absent. Known only from a cave in Ecuador     Troglochares
–		Eyes present    2
2		Eyes completely divided into dorsal and ventral sections by a lateral projection of frons. Size small (<3 mm)     Quadriops
–		Eyes not divided into dorsal and ventral sections by frons. Size variable    3
3		Labrum concealed by clypeus, elytral margins broadly explanate. Body extremely dorsoventrally compressed     Helobata
–		Labrum not concealed by clypeus elytral margins not or at most weakly explanate. Body form variable but rarely dorsoventrally compressed    4
4		Elytra with distinctly impressed sutural striae. Only Neotropical region     Chasmogenus
–		Elytra without sutural striae. Both Neotropical and Nearctic    5
5		Prosternum with strongly elevated median carina     Crucisternum
–		Prosternum without median carina; at most tectiform medially    6
6		Metafemora entire glabrous. Size small (<3 mm)     Tobochares
–		Metafemora pubescent at least on basal half or anterior third. Size variable    7
7		Fifth ventrite entire, without apical emargination or truncation. Antennae with nine antennomeres. Maxillary palps shorter than the width of the head     Radicitus
–		Fifth ventrite with apical emargination or truncation. Antennae with eight or nine antennomeres. Maxillary palps variable in length    8
8		Elytral systematic punctures very distinct, distinctly larger than surrounding ground punctation. Antennae with nine antennomeres     Katasophistes
–		Elytral systematic punctures indistinct, usually blending with surrounding ground punctation. Antennae with eight or nine antennomeres    9
9		Antennae with nine antennomeres. Size variable, but rarely less than 4 mm. Extremely common and widespread throughout the New World     Helochares
–		Antennae with eight antennomeres. Rare and only known from the Guiana Shield region of South America. Size very small (< 3 mm)    10
10		Body form circular, rounded. Size very small (1.9-2.3 mm)     Globulosis
–		Body form ovoid, parallel sided. Size exceedingly small (1.1–1.5 mm)     Nanosaphes

Taxon Treatment

• Girón, J; Short, A; 2018: Three new genera of acidocerine water scavenger beetles from tropical South America (Coleoptera, Hydrophilidae, Acidocerinae) ZooKeys, (768): 113-158. doi

Images

Figure 21. Habitus of Chasmogenus cremnobates: A dorsal view B lateral view C ventral view D head E aedeagus. Scale bar 1 mm.