Hydrodessus latotibialis Miller, 2016

Benetti, Cesar J., Michat, Mariano C. & Hamada, Neusa, 2020, Hydrodessus ducke sp. n. and new records of other species of the genus (Coleoptera, Dytiscidae, Bidessini), Zootaxa 4743 (1), pp. 47-60: 49-50

publication ID

https://doi.org/10.11646/zootaxa.4743.1.4

publication LSID

lsid:zoobank.org:pub:63D7BE74-E248-4D1E-92A7-D5288170DB13

DOI

http://doi.org/10.5281/zenodo.3688155

persistent identifier

http://treatment.plazi.org/id/03E5D649-B479-DE25-DBF7-FAB6FB590382

treatment provided by

Plazi

scientific name

Hydrodessus latotibialis Miller, 2016
status

 

Hydrodessus latotibialis Miller, 2016  

( Figs 3, 4 View FIGURES 1–4 , 7, 8 View FIGURES 5–8 , 12–14 View FIGURES 9–14 , 17 View FIGURE 17 )

Material examined. Holotype (♀) labeled: “ PERU: Madre de Dios: Rio Tambopata Res : 30 km SW Pto. Maldo- nado, 290 m a.s.l., 16–20 XI 1979 J.B. Heppner subtropical moist forest / HYDRODESSUS   sp. P.J.S. [handwritten] / HOLOTYPE Hydrodessus latotibialis Miller, 2016   [red label with black line border].”   Paratype (♀) same data as holotype, except for having only locality label. (holotype and paratype deposited in USNM)   .

Additional material examined: 2 ♂, 1 ♀: Brazil: Pará State , Paragominas County (03º46’55”S 048º30’43”W), 22.vii.2011, leg. J. Brito and V. Oliveira ( INPA) GoogleMaps   .

Description. Measurements. TL = 2.9–3.2 mm, GW = 1.4–1.5 mm, PW = 1.2–1.3 mm, HW = 0.8–0.9 mm, EW = 0.5–0.6 mm, TL/GW = 2.0–2.1, HW/EW = 1.5–1.7.

Male genitalia. Median lobe bilaterally symmetrical; in lateral aspect ( Fig. 12 View FIGURES 9–14 ) with basal portion broad, medially evenly and broadly curved, subapically strongly narrowed, then sinuate to sharply pointed apex; in ventral aspect ( Fig. 13 View FIGURES 9–14 ) robust and broad, lateral margins slightly divergent to broadened apical third, then converging towards slightly convex apex. Lateral lobes ( Fig. 14 View FIGURES 9–14 ) broad basally, distally gradually narrowed, apex rounded with series of short setae.

Sexual dimorphism. Male pro- and mesotarsi I–III slightly broader than in female, ventrally with several large adhesive setae; male mesotibia apically broader than in female.

Variation. Little variation was observed among specimens, mainly in pronotal and elytral coloration and in elytral maculae which are stronger in some specimens from Brazil.

Distribution. Hydrodessus latotibialis   is known from Brazil (Pará) and Peru (Madre de Dios) ( Miller 2016) ( Fig. 17 View FIGURE 17 ).

Habitat. Type specimens were collected from subtropical moist forest ( Miller 2016). Specimens from Brazil were collected in a shaded forest stream, at 107 m a.s.l.  

Discussion. According to Miller (2016) this species has indistinct pale areas on elytra. However, we examined the holotype and the single paratype of H. latotibialis   and found that the elytra have pale, somewhat diffuse but distinct yellow maculae basally, laterally, subapically and at apex, similar to H. maculatus Miller, 2016   . Hydrodessus latotibialis   is similar to H. maculatus   , H. phyllisae Spangler, 1985   and H. tenuatus Miller, 2016   but differs from these species in the shape of the male median lobe, which in lateral view is medially evenly and broadly curved, subapically strongly narrowed, then sinuate to sharply pointed apex; in ventral view with lateral margins slightly divergent to broadened apical third, then converging towards apex. In addition, H. latotibialis   differs from H. maculatus   , H. phyllisae   and H. tenuatus   in having the apices of metaventrite carinae located well mediad to the anterior apices of metacoxal lines (metaventrite carinae and metacoxal lines approximately continuous in those species). The distance between the type locality from Peru and the new record from Brazil is surprising but not uncommon, since a similar distribution pattern is observed in other Hydrodessus   species (e.g. H. keithi Miller, 2016   ).

USNM

Smithsonian Institution, National Museum of Natural History

INPA

Instituto Nacional de Pesquisas da Amazonia