Bidessus cf. nero Gschwendtner, 1933

Bergsten, Johannes, Ranarilalatiana, Tolotra & Biström, Olof, 2020, A new species of Bidessus from Anjozorobe-Angavo and a review of Malagasy Bidessus (Coleoptera, Dytiscidae), European Journal of Taxonomy 720, pp. 1-18 : 11-13

publication ID

https://doi.org/ 10.5852/ejt.2020.720.1109

publication LSID

lsid:zoobank.org:pub:0CF83E89-2532-407B-921F-C05F9A29C68D

DOI

https://doi.org/10.5281/zenodo.4329741

persistent identifier

https://treatment.plazi.org/id/03828798-D37F-6464-FD98-FEB5A856FDBC

treatment provided by

Valdenar

scientific name

Bidessus cf. nero Gschwendtner, 1933
status

 

Bidessus cf. nero Gschwendtner, 1933 View in CoL

Figs 1D View Fig , 3D View Fig

Bidessus nero Gschwendtner, 1933: 86 View in CoL .

Bidessus nero View in CoL – Bistr̂m 1985: 18. — Nilsson 2001: 115. — Nilsson & Hajek 2020: 104.

Bidessus unicolor (Guignot, 1946) – Guignot 1959: 255.

Diagnostic characters

Head frontally not margined; provided with a slight depression slightly posterior to anterior edge of head (between eyes); frontal depression is medially broadly vague and indistinct. Pronotum on disc with a broad impunctate area. Pronotal striae at base not deeply impressed, distinctly angled and not smoothly curved. Basal striae of elytra medium long and distinct. Anteriorly sutural lines of elytra disappear abruptly a short distance before reaching frontal edge; posteriorly lines fade away long before reaching apex. Elytra with punctures on each side of basal striae of equal size and density (rather fine, sparse and slightly irregular). Apical ventrite with rather fine, slightly sparse punctuation. Female with outline of elytra posteriorly smooth (minor process absent). Penis in lateral view quite slender and evenly curved; apex distinct (also slightly curved). Penis apex not distinctly extended ( Fig. 3D View Fig ).

Length of body 1.5–1.9 mm.

Material examined

MADAGASCAR • 1 ♂; Fianarantsoa former province, Amoron’i Mania region , 3 km south of Ambalamanakana next to RN7, Ankazomivady forest ; 20.7722° S, 47.1809° E; 1700 m a.s.l.; 1 Nov. 2014; J. Bergsten, T. Ranarilalatiana and S.Holmgren leg.; collecting event MAD14-02; hygropetric rocks and marsh with vegetation; NHRS-JLKB000025032 GoogleMaps 5 specs (preserved in ethanol); same collection data as for preceding; NHRS-JLKB000025024 GoogleMaps 1 spec.; same collection data as for preceding; FMNH GoogleMaps 1 spec.; same collection data as for preceding; PBZT / MBC GoogleMaps 1 spec. (preserved in ethanol); Fianarantsoa former province, Matsiara Ambony region , Ranomafana NP, 500 m from the road at Vohiparara village; 21.2397° S, 47.3774° E; 1110 m a.s.l.; 3 Nov. 2014; J. Bergsten, T. Ranarilalatiana and S. Holmgren leg.; collecting event MAD14-10; small forest lake with floating margins of vegetation; NHRS- JLKB000025025 GoogleMaps 1 spec.; Toamasina former province, Alaotra Mangoro region , 6 km W of Moramanga, Betsabora river by RN2 near Antsampanana village; 18.9247° S, 48.1828° E; 900 m a.s.l.; 24 Nov. 2014; J. Bergsten, J.H. Randriamihaja and T. Ranarilalatiana leg.; collecting event MAD14-81; river with side pools; NHRS-JLKB000025026 GoogleMaps 2 specs; Fianarantsoa former province, ca 9 km SW Ivato, Bemanta (inselberg); 20°40′00″ S, 47°07′41.5″ E; 1531 m a.s.l.; 18 May 2016; Ramahandrison and Manuel leg.; wide and calm portion of small river; CMM GoogleMaps 16 specs; Fianarantsoa former province, along road N7 between Ambositra and Fianarantsoa, ca 3.5 km S of Ambalamanakana; 20°46′33″ S, 47°10′53″ E; 1702 m a.s.l.; 19 May 2016; Ramahandrison and Manuel leg.; large pond with Nymphaeaceae and surrounding peat bog with Sphagnum and Drosera ; CMM GoogleMaps 13 specs; Fianarantsoa former province, ca 8 km WNW of Ranomafana, ca 1 km SW of Vohiparara; 21°14′51″ S, 47°22′34.5″ E; 1134 m a.s.l.; 29 Dec. 2017; Ramahandrison and Manuel leg.; small marsh, very shallow, with small Poaceae and Cyperaceae , along slowly flowing stream; CMM. GoogleMaps

Distribution

First record from Madagascar and here recorded from Ranomafana NP, near Ambalamanakana and Ivato along RN7 and near Moramanga ( Fig. 4C View Fig ). As tentatively defined here, the species is distributed in central and east Africa and Madagascar (see Bistr̂m 1985; Nilsson & Hajek 2020).

Collecting circumstances

On Madagascar found at elevations between 900–1700 m a.s.l. The localities are characterized by being vegetation-rich stagnant waters, a pool next to a river, a pond/marsh and small lake with floating vegetation edges. Semi-open to open landscapes.

Taxonomic observation

Further study on molecular level may reveal that B. cf. nero in Madagascar is in fact a separate species.

FMNH

USA, Illinois, Chicago, Field Museum of Natural History (also used by Finnish Museum of Natural History)

PBZT

Madagascar, Antananarivo, Parc Botanique et Zoologique de Tsimbazaza

FMNH

Field Museum of Natural History

PBZT

Parc Botanique et Zoologique de Tsimbazaza

MBC

Montgomery Botanical Center

CMM

Culture Collection of Phytopathogenic Fungi (Colecao de Culturas de Fungos Fitopatogenicos Prof. Maria Menezes)

Kingdom

Animalia

Phylum

Arthropoda

Class

Insecta

Order

Coleoptera

Family

Dytiscidae

Genus

Bidessus

Loc

Bidessus cf. nero Gschwendtner, 1933

Bergsten, Johannes, Ranarilalatiana, Tolotra & Biström, Olof 2020
2020
Loc

Bidessus nero

Nilsson A. N. & Hajek J. 2020: 104
Nilsson A. N. 2001: 115
2001
Loc

Bidessus unicolor (Guignot, 1946)

Guignot F. 1959: 255
1959
Loc

Bidessus nero

Gschwendtner L. 1933: 86
1933
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