Hydrodessus pereirai
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Ordo: Coleoptera
Familia: Dytiscidae
Genus: Hydrodessus
Name
Hydrodessus pereirai (Guignot, 1957) – Wikispecies link – Pensoft Profile
- Brinckius pereirai Guignot, 1957: 41.
- Hydrodessus pereirai, Young 1969[1]: 2; 1970[2]: 157; Spangler 1985[3]: 88; Biström 1988[4]: 37; Nilsson 2001[5]: 236.
Type locality
Brazil, Pará State, Cachimbo.
Diagnosis
Specimens of this species are among the largest Hydrodessus (TL = 3.9). The lateral elytral carina is distinctly present only at the humeral angle, though it can be traced further along the elytron out to about 1/4 ts length (Fig. 4B), the dorsal and ventral coloration is approximately evenly dark red (Fig. 4A), the lateral pronotal margins are broadly curved (Fig. 4A), the prosternal process is broad with distinctive lateral lobes anteriorly (Fig. 4C), the metaventrite carinae are moderately distinctive, not strongly constricted, and moderately divergent posteriorly (Fig. 4C), the metacoxal lines are broadly separated and somewhat divergent anteriorly (Fig. 4C). Hydrodessus pereirai is superficially very similar to Hydrodessus brevis in coloration, shape, and general structures, but that species has a maximum length of about 2.5mm. Unfortunately, males are not known for Hydrodessus pereirai so the usually definitive character system of male genitalia is not available for comparison.
Description
Measurements. TL = 3.8 mm. Body elongate, apically pointed, lateral margin strongly discontinuous between pronotum and elytron (Fig. 4A).
Coloration (Fig. 4A). Head, pronotum and elytra evenly dark red. Antennae and palps yellow-red. Legs yellow-brown to yellow-red. Venter dark red, yellow-red at apex of abdomen.
Sculpture and structure. Head broad, anterior margin slightly flattened medially; surface covered with minute punctures; eyes moderately small. Pronotum cordate, widest anterior to middle (Fig. 4A); lateral bead fine, but distinct; surface covered with fine punctation. Elytra long, apically pointed; lateral carina distinctive, extending about 1/3 length of elytron (Fig. 4B); surface covered with minute punctation. Prosternum medially with broad, rounded ridge; prosternal process broad, broadest at anterior laterally expanded lobes, lateral margins slightly convergent to slightly curved, subtruncate apex, medially distinctly impressed (Fig. 4A). Metaventrite with anterior process elongate, moderately slender, flattened; metasternal carina distinctive, straight from sides of process, evenly divergent across Metaventrite (Fig. 4C); surfaces covered with minute punctures. Legs with most surfaces covered with fine punctation; pro- and mesotibiae slender; metatibia with distinctive brush of dense, elongate setae on postero-apical surface; metatrochanter distinctly offset, apically narrowly rounded; metacoxa with surface covered with minute punctures; metacoxal lines broadly separated, slightly sinuate and divergent anteriorly (Fig. 4C). Abdomen covered with minute punctures; abdominal ventrite VI with apex slightly pointed.
Female genitalia. Not examined.
Sexual dimorphism. Only one, female specimen (the holotype) was examined.
Variation. Only one, female specimen (the holotype) was examined.
Distribution
The species is known only from the type locality in Para, central Brazil (Fig. 45).
Habitat
Nothing is known of the habitat of this species.
Specimens
Only the female holotype in MZSP was examined, labeled, “Type [red label with black border]/ Brasilien, Para Cachimbo X.1955 Pereira/ F. Guignot det., 1956 Brinckius Pereirai Type ♀ [handwritten]/ 31901.”
Taxon Treatment
- Miller, K; 2016: Revision of the Neotropical diving beetle genus Hydrodessus J. Balfour-Browne, 1953 (Coleoptera, Dytiscidae, Hydroporinae, Bidessini) ZooKeys, (580): 45-124. doi
Images
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![Figures 1–7. Hydrodessus species. 1 Hydrodessus keithi, left metathoracic leg, posterior aspect 2 Hydrodessus amazonensis, redrawn from Spangler (1966)[6] A dorsal habitus B male median lobe, right lateral aspect C male right lateral lobe, right lateral aspect 3 Hydrodessus nanayensis, dorsal habitus, redrawn from Spangler (1966)[6] 4 Hydrodessus pereirai A dorsal aspect B lateral aspect C prosternal process, mesoventrite, mesocoxae 5 Hydrodessus keithi, elytra, lateral aspect A male B female 6 Hydrodessus biguttatus, right metatrochanter and metafemur, anterior aspect 7 Hydrodessus, left protibia, anterior aspect A Hydrodessus phyllisae B Hydrodessus tenuatus. Scale bars = 1.0 mm for 4A, B only.](/wiki/File:Zookeys-580-e8153-g001.jpg)
Other References
- ↑ Young F (1969) A checklist of the American Bidessini (Coleoptera: Dytiscidae-Hydroporinae). Smithsonian Contributions to Zoology 33: 1–5. doi: 10.5479/si.00810282.33
- ↑ Young F (1970) Two new species of Hydrodessus from Suriname, with a key to the known species (Coleoptera: Dytiscidae). Uitgaven Natuurwetenschappelijke Studiekring voor Suriname en de Nederlandse Antillen, Utrecht 60: 152–158.
- ↑ Spangler P (1985) Five new species of the predacious water beetle genus Hydrodessus from Guyana and a key to the species (Coleoptera: Dytiscidae). Proceedings of the Academy of Natural Sciences of Philadelphia 137: 80–89.
- ↑ Biström O (1988) Generic review of the Bidessini (Coleoptera, Dytiscidae). Acta Zoologica Fennica 184: 1–41.
- ↑ Nilsson A (2001) Dytiscidae. World Catalogue of Insects. Apollo Books, Stenstrup, 395 pp.
- ↑ 6.0 6.1 Spangler P (1966) The Catherwood Foundation Peruvian-Amazon Expedition. XII. Aquatic Coleoptera (Dytiscidae, Noteridae, Gyrinidae, Hydrophilidae, Dascillidae, Helodidae, Psephenidae, Elmidae). Monographs of the Academy of Natural Science of Philadelphia 14: 377–443.
