Crucisternum toboganensis , Giron, Jennifer C. & Short, Andrew Edward Z., 2018

Giron, Jennifer C. & Short, Andrew Edward Z., 2018, Three new genera of acidocerine water scavenger beetles from tropical South America (Coleoptera, Hydrophilidae, Acidocerinae), ZooKeys 768, pp. 113-158: 120-121

publication ID

http://dx.doi.org/10.3897/zookeys.768.24423

publication LSID

lsid:zoobank.org:pub:399BCC3E-9D6F-4231-870E-05C79B9FD4B0

persistent identifier

http://treatment.plazi.org/id/D6CCF6F9-9452-4074-A71C-B8891F894008

taxon LSID

lsid:zoobank.org:act:D6CCF6F9-9452-4074-A71C-B8891F894008

treatment provided by

ZooKeys by Pensoft

scientific name

Crucisternum toboganensis
status

sp. n.

Crucisternum toboganensis  sp. n. Figs 6C; 7

Type material examined.

Holotype (male): VENEZUELA: Amazonas: "Puerto Ayacucho (40 km S)/ El Tobogán, Caño Coromoto/ 26 January 1989/ CL2388, John T. Polhemus/ side stream/ head of lower falls" ( USNM) Paratypes (2): Same data as holotype (1, USNM); same locality but leg. M. Balke (1, SEMC; DNA voucher SLE 734).

Differential diagnosis.

Crucisternum toboganensis  is nearly indistinguishable from C. ouboteri  based on external characters beyond coloration (uniform along the body in C. toboganensis  , paler pronotum in C. ouboteri  ). They can be recognized by characters of the aedeagus: the apical third of the parameres gradually narrow towards the apex, with straight outer margins in C. toboganensis  (Fig. 6C), whereas in C. ouboteri  the apical third of the parameres is parallel-sided and has sinuate outer margins (Fig. 6A, B).

Description.

Body length 2.1-2.4 mm, width 1.2-1.3 mm. General coloration uniformly brown along body regions. Elytra with punctures rather sharply marked. Aedeagus (Fig. 6C) fusiform, widest slightly beyond mid length; median lobe gradually narrowing from basal fifth towards apical region; gonopore on apical region of median lobe; apical third of parameres gradually narrowing towards apex, with straight outer margins.

Etymology.

Named after the type locality: El Tobogán de la Selva in Venezuela.

Distribution.

Venezuela (Amazonas). See Fig. 7.

Biology.

Nothing is known about the biology of this species except that it was collected from the margin of the Rio Coromoto, the infamous locality for many water beetle species including the family Meruidae  (see Spangler and Steiner 2005).