Gibbidessus pederzanii, Hendrich & Watts & Balke, 2020
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publication ID |
https://dx.doi.org/10.3897/zookeys.975.55456 |
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publication LSID |
lsid:zoobank.org:pub:785EDF22-5A32-4217-8C9B-6433E0AD199F |
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persistent identifier |
https://treatment.plazi.org/id/9389E4E1-D5E3-4063-A0F3-33C7FAFD045E |
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taxon LSID |
lsid:zoobank.org:act:9389E4E1-D5E3-4063-A0F3-33C7FAFD045E |
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treatment provided by |
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scientific name |
Gibbidessus pederzanii |
| status |
sp. nov. |
Gibbidessus pederzanii sp. nov. Figs 7 View Figures 5–7 , 12 View Figure 12 , 19 View Figures 18, 19 , 25 View Figures 24, 25
Type locality.
Australia, Western Australia, creek around Nannup [33°58'S, 115°45'E].
Type material.
Holotype: Male, "Australia (WA) Nannup env. roadside creeks 1/12/98 Pederzani", "Holotype Gibbidessus pederzanii Hendrich, Watts & Balke des. 2020" [red printed label] (SAMA). Paratypes (13 exs.): All specimens with same data as holotype. Two specimens with " SAMA Database No 25-001593" and one with a yellow printed label “photographed” (CFP, CLH, SAMA, ZSM). All paratypes are provided with printed red paratype labels.
Diagnosis.
Medium-sized species which externally is characterised by a rounded habitus, without disruption between pronotum and elytron, and shiny, non-microreticulate dorsal surface with testaceous markings on elytra. Dorsoventrally rather arched. Without cervical line but rather a few punctures instead (Fig. 7 View Figures 5–7 ).
Measurements.
Holotype: TL = 1.5 mm, TL-H = 1.3 mm, MW = 0.85 mm. Paratypes: TL = 1.5-1.6 mm, TL-H = 1.3-1.4 mm, MW = 0.85-0.95 mm.
Head: Ferruginous, around eyes almost black, without cervical line but rather a few punctures instead (Fig. 12B View Figure 12 ). Coarsely punctate, rather shiny, weak microreticulation visible. Punctures weakly anteriorly and strongly posteriorly between eyes. Antennae relatively short, stout. Antennomeres 1 and 2 ferruginous, 3-11 darkened anteriorly.
Pronotum: Ferruginous, anterior and posterior margins, between striae, slightly darker, broadest at posterior corners. Punctation very weak almost evenly distributed, shiny and microsculpture absent. Sides of pronotum margined and almost evenly rounded. Angle between pronotum and elytra less pronounced, basal pronotal plicae present. Striae moderately defined, almost 1/2 length of pronotum, slightly incurved.
Elytra: Dark brown with vague basolateral and apical area ferruginous (Fig. 7 View Figures 5–7 ). Coarsely and densely punctate, shiny, microsculpture absent. Striae deeply impressed, straight but shorter than basal pronotal striae.
Ventral side: Ferruginous. Prothorax and abdomen paler than other parts. Metacoxae and metaventrite covered with larger punctures, surface shiny, without microreticulation. Abdominal ventrites with dense and finer punctures, shiny, microreticulation absent. Metacoxal lines almost straight, anteriorly not divergent. Epipleuron testaceous, with few coarse punctures, shiny, lacking microsculpture. Legs ferruginous with meta- and mesotarsi somewhat darkened.
Male. Dorsal surface with coarse punctures but otherwise with shiny surface (Fig. 7 View Figures 5–7 ). Median lobe of aedeagus as in Fig. 19A, B View Figures 18, 19 . Shape of median lobe, almost straight and fairly uniform in lateral view, in ventral view rounded at apex. Parameres bi-segmented, elongated, and without setae at apex (Fig. 19C, D View Figures 18, 19 ).
Affinities.
This species is similar to G. davidi sp. nov. but readily separated by the different colour pattern, the more roundish body (Figs 4 View Figures 1–4 , 7 View Figures 5–7 ), the larger punctation on elytra, and the form of the median lobe and parameres (Figs 16 View Figures 16, 17 , 19 View Figures 18, 19 ).
Etymology.
The species is named after our colleague, the dytiscid specialist Fernando Pederzani (Ravenna, Italy), who collected the type material. The specific epithet is a substantive in the genitive case.
Distribution.
South-western Australia. A rare species, which is only known from the type locality somewhere around Nannup in south-western Australia. Most probably a more inland species and restricted to forested areas and not in heathland or coastal sedge swamps (Fig. 25 View Figures 24, 25 ).
Habitat.
All specimens were collected in shallow water at the edge of a small slow flowing forest creek (F. Pederzani in litt.).
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