Corresponding author: Andrew Edward Z. Short (aezshort@ku.edu)
Academic editor: M. Michat
The genus
Kohlenberg AT, Short AEZ (2017) Revision of the Neotropical water scavenger beetle genus
The genus
List of specimens and GenBank accession numbers used in this study. All vouchers are deposited in
Taxon | Extraction | Locality | Coordinates | GenBank Accession |
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SLE424 | Suriname: Kasikasima |
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SLE482 | Suriname: Kasikasima |
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SLE483 | Suriname: Kasikasima |
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SLE1045 | Suriname: Kappel Airstrip |
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SLE1046 | Suriname: Kappel Airstrip |
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SLE1048 | Suriname: Tafelberg Summit |
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SLE1049 | Suriname: Tafelberg Summit |
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SLE1050 | Suriname: Tafelberg Summit |
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SLE1021 | Guyana: Kusad Mts. |
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SLE525 | Venezuela: Tobogan de la Selva |
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SLE422 | Suriname: Kasikasima |
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SLE478 | Suriname: Kasikasima |
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SLE497 | Suriname: Kasikasima |
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SLE1020 | Guyana: Kusad Mts. |
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SLE1023 | Suriname: Kwamala |
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SLE423 | Suriname: Kasikasima |
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SLE0035 | Venezuela: Tobogan de la Selva |
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SLE1027 | Venezuela: Tobogan de la Selva |
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SLE1035 | Venezuela: Tobogan de la Selva |
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SLE1037 | Venezuela: Pijiguaos |
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SLE526 | Venezuela: Tobogan de la Selva |
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The results of the maximum likelihood analysis (Fig.
Maximum likelihood phylogeny of
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10.
Species of
Dorsal and lateral habitus of
Dorsal and lateral habitus of
Front and lateral view of heads of
Size small, 1.5–2.4 mm. Antennae with eight antennomeres, including three-segmented club. Elytra without sutural stria, but with serial punctures impressed into distinct grooves (serial punctures present but not impressed into groves in
Front and lateral view of heads of
Venezuela (Amazonas, Bolivar), Guyana, Suriname.
Nearly all collections of
The combination of the pale dorsal coloration and deeply sulcate elytra along their entire length (Fig.
Dimunuative of
Known only from the type locality in Venezuela (Fig.
This species has been collected on several occasions on rock seepages along the margin of the Rio Coromoto (Fig.
Front and lateral view of heads of
The lack of impressed striae on the elytra (Fig.
Ventral view of heads of
Named after the condition of the eyes, in which a lateral
Known only from the type locality in Venezuela (Fig.
This species was collected on a rock seepage along the margin of the Rio Coromoto (Fig.
The lack of impressed striae on the elytra, strongly emarginated eye (Fig.
Named after the condition of the eyes, in which a lateral
Known from several localities in central and southern Suriname (Fig.
The majority of specimens were collected on a large granite seepage on Kasikasima (Fig.
The weakly impressed striae limited to the posterior third of the elytra (Fig.
The species was originally described from a single male from Mt. Kasikasima in south-central Suriname. It has subsequently been collected in longer series at several other localities in central and southern Suriname including from the summit of Tafelberg Tepui (Fig.
The first specimen of this species was found in a seepage at the base of Kasikasima (Fig.
Ventral view of heads of
This species can be distinguished from most species by the impressed striae running the full length of the elytra and its overall dark brown coloration (Fig.
Named after Kusad Mountain in the South Rupununi region of Guyana, from where the species is known.
Only known from the type locality in Guyana (Fig.
The species was collected on a thin rock seepage flowing over granite that was associated with a small creek (Fig.
Mesoventrite of
This small species may be easily distinguished by the combination of its very pale dorsal coloration and lack of impressed elytral striae (Fig.
Named for the species’ relatively pale body coloration.
Known from several localities along the northwestern shoulder of the Guiana Shield in Venezuela (Fig.
All six collecting events of this species were from rock seepages. The type locality and longest series of specimens were collected on a rock seepage along the margin of the Rio Coromoto (Fig.
Because this species co-occurs with several other
Metaventrite of
This species can be distinguished from most other
Originally described from an inselberg on the Suriname-Guyana boarder, this species has now been found at other localities in both countries (Fig.
The most frequently encountered species of the genus thus far in the eastern Guianas,
Elytra of
See differential diagnosis for
Known only from two localities in south-central Suriname (Fig.
Metafemora (ventral view) of
The dark brown coloration and deep elytral grooves, which are impressed along their entire length (Fig.
Abdominal ventrites of
Known from a series of localities along the northwestern edge of the Guiana Shield in Venezuela (Fig.
This species is morphologically very similar to
Aedeagi (ventral view) of
This species is only known from a single specimen, which we also extracted for DNA. Molecular data also supports this taxon as sister to
Distribution of
Habitat of
Habitat of
Habitat of
1 | Elytra with impressed grooves along their entire length (e.g. Figs |
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– | Elytra with impressed grooves in posterior half or less, or with grooves absent (e.g. Fig. |
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2 | Apical maxillary palpomere uniformly pale (Fig. |
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– | Apical maxillary palpomere darkened at least at apex, and sometimes on distal half or more (Fig. |
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3 | Punctures within elytral grooves small, grooves appearing fairly smooth (Fig. |
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– | Punctures within elytral grooves strongly impressed and distinct (Fig. |
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4 | Apical maxillary palpomere with apex ranging from slightly to distinctly darkened (Fig. |
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– | Apical maxillary palpomere darkened in at least distal half (Fig. |
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5 | Elytra with grooves on posterior third or posterior half, grooves most prominent near elytral suture (e.g. Fig. |
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– | Elytra without grooves or with weak grooves on posterior quarter (e.g. Fig. |
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6 | Elytra with grooves on posterior half (Fig. |
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– | Elytra with grooves on posterior third (Fig. |
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7 | Dorsum of head, pronotum, and elytra uniformly pale (Fig. |
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– | Dorsum of head, pronotum, and elytra brown to dark brown (e.g. Fig. |
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8 | Elytra without grooves (Fig. |
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– | Elytra with weak grooves on posterior quarter. Eyes emarginate at lateral margin, narrowing to slightly less than half of the width |
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9 | Aedeagus (Fig. |
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– | Aedeagus (Fig. |
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The water beetle seepage fauna of the Guiana Shield was essentially completely undescribed little more than 15 years ago. Since that time, numerous new lineages have been discovered in a variety of families, including
Most sampled localities had only a single, or occasionally two species of
Given how relatively little of the Guiana Shield has been surveyed, especially for hygropetric taxa, it is almost a certainty many more
The fieldwork that generated these specimens would not have been possible without the invaluable assistance of many colleagues, including Jesus Camacho and Mauricio Garcia (