Bidessodes obscuripennis

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Taxonavigation

Ordo: ORDO
Familia: FAMILIA
Genus: Bidessodes

Name

Bidessodes obscuripennis (Zimmermann, 1921) – Wikispecies link – Pensoft Profile

• Bidessus (Bidessodes) obscuripennis Zimmermann, 1921: 19; Blackwelder 1944: 76.
• Bidessodes obscuripennis, Young 1969: 2.
• Bidessodes (Hughbosdinius) obscuripennis, Young 1986: 209; Biström 1988: 7; Nilsson 2016: 98.

Diagnosis

The species differs from others in having the prosternal process anteriorly carinate with distinctive setae in males. Females have the prosternal process unmodified. This species and Bidessodes knischi each have the prosternal process basally carinate, at least in males, but they are otherwise rather different. The prosternal process is narrow, flat, with the lateral margins slightly convergent to the pointed apex. The metaventrite is not transversely grooved. The male mesotibia is unmodified. The metatrochanter in males is exceptionally large, distinctly offset and prominent apically (Fig. 81). The male abdominal ventrite VI is apically broadly impressed. The male genitalia are also distinctive. In lateral aspect the median lobe is slender and apically abruptly curved (Fig. 78). In ventral aspect the median lobe is deeply bifid, each branch ending in a bifurcation. The medial branch of each bifurcation is sinuate and apically pointed, the lateral branch is broad and apically subtruncate (Fig. 79). The lateral lobe has the apical segment extremely broad and irregularly margined (Fig. 80). Specimens are robust with complex maculae on the elytra (Fig. 77).

Distribution

Known from Guyana and western Brazil (Fig. 100).

Taxon Treatment

• Miller, K; 2017: A review of the Neotropical genus Bidessodes Régimbart, 1895 including description of four new species (Coleoptera, Adephaga, Dytiscidae, Hydroporinae, Bidessini) ZooKeys, (658): 9-38. doi

Images

Figures 61–81. Bidessodes species. 61–66 Bidessodes jucundus 61 dorsal habitus, scale = 1 mm 62 male genitalia 62 median lobe, right lateral aspect 63 median lobe, ventral aspect 64 right lateral lobe, right lateral aspect 65 left metatrochanter and metafemur, anterior aspect, scale = 0.25 mm 66 left mesotrochanter, mesofemur and mesotibia, anterior aspect, scale = 0.25 mm 67–71 Bidessodes knischi 67 dorsal habitus, scale = 1 mm 68 male genitalia 68 median lobe, right lateral aspect 69 median lobe, ventral aspect 70 right lateral lobe, right lateral aspect 71 left metatrochanter and metafemur, anterior aspect, scale = 0.25 mm 72–76 Bidessodes nessimiani 72 dorsal habitus, scale = 1 mm 73 male genitalia 73 median lobe, right lateral aspect 74 median lobe, ventral aspect 75 right lateral lobe, right lateral aspect 76 left metatrochanter and metafemur, anterior aspect, scale = 0.25 mm 77–81 Bidessodes obscuripennis 77 dorsal habitus, scale = 1 mm 78 male genitalia 78 median lobe, right lateral aspect 79 median lobe, ventral aspect 80 right lateral lobe, right lateral aspect 81 left metatrochanter and metafemur, anterior aspect, scale = 0.25 mm.  Figures 99–100. Distributions of Bidessodes species based on examined specimens and published records.