Bidessus Sharp 1882

Autor: Bergsten, Johannes, Ranarilalatiana, Tolotra, Biström, Olof
Rok vydání: 2020
Předmět:
DOI: 10.5281/zenodo.4329736
Popis: Key to species of Bidessus on Madagascar 1. Elytral stria long, approximately half the length of elytron (Figs 1A, 2C)...................................... 2 – Elytral stria short, distinctly shorter than half the length of elytron (Figs 1 B–D, 2A–B)................ 3 2. Elytral stria straight (Fig. 1A); female ventrite with a deep, longitudinal furrow; female elytron posteriorly with a distinct, lateral extension (Fig. 1A)...... B. apicidens Biström & Sanfilippo, 1986 – Elytral stria sinuate (Fig. 2C); female ventrite simple, no longitudinal furrow; female elytron posteriorly smooth, lacks extension.................................................. B. longistriga Régimbart, 1895 3. Small species (max. length 1.5 mm); elytra with distinct, longitudinal, pale markings (Fig. 2B)....................................................................................................................... B. perexiguus Kolbe, 1883 – Larger species (length 1.5–2.0 mm); elytra predominantly dark, sometimes with minor, vague, pale markings (Figs 1 B–D, 2A)............................................................................................................... 4 4. Frontal transverse depression of head transformed to four minor, slightly vague, tubercles (Fig. 1B)................................................................................................. B. cf. ceratus Guignot, 1941 – Frontal transverse depression of head not transformed to small tubercles (depression laterally distinct, medially vague)................................................................................................................... 5 5. Head and pronotum mainly pale, testaceous (Fig. 1D)................... B. cf. nero Gschwendtner, 1933 – Head distinctly darker than pronotum (Figs 1C, 2A)....................................................................... 6 6. Elytral stria longer (approximately ⅓ of elytron length); body shape broad (Fig. 1C); pronotum extensively pale (dark markings reduced to narrow areas close to frontal and posterior edges) (Fig. 1C); antenna pale (Fig. 1C).................................................................... B. anjozorobe sp. nov. – Elytral stria short (less than ⅓ of elytron length); body shape slender (Fig. 2A); pronotum extensively dark (pale markings reduced to quite narrow medial area, often divided into two separate spots) (Fig. 2A); antenna segments 4–11 dark (Fig. 2A)................................. B. nesioticus Guignot, 1956
Published as part of Bergsten, Johannes, Ranarilalatiana, Tolotra & Biström, Olof, 2020, A new species of Bidessus from Anjozorobe-Angavo and a review of Malagasy Bidessus (Coleoptera, Dytiscidae), pp. 1-18 in European Journal of Taxonomy 720 on page 3, DOI: 10.5852/ejt.2020.720.1109, http://zenodo.org/record/4068355
{"references":["Bistrom O. & Sanfilippo N. 1986. Bidessus apicidens sp. n., and faunistic notes on the genus from Africa (Coleoptera, Dytiscidae). Annales Entomologici Fennici 52: 46 - 47.","Regimbart M. 1895. Revision des Dytiscidae et Gyrinidae d'Afrique, Madagascar et iles voisines. Memoires de la Societe entomologique de Belgique 4: 1 - 244.","Kolbe H. J. 1883. Uber die madagascarischen Dytisciden des K ˆ nigl. entomologischen Museums zu Berlin. Archiv fur Naturgeschichte 49 (1): 383 - 427.","Guignot F. 1941. Description de nouveaux Dytiscidae d'Afrique. Bulletin de la Societe d'Etude des Sciences naturelles de Vaucluse 11 (3 - 4) (1940): 31 - 39.","Gschwendtner L. 1933. Neue Schwimmkafer aus Belgisch Kongo. IV. Teil. Revue de Zoologie et botanique africaines 23: 84 - 95.","Guignot F. 1956. Contribution a la connaissance de la faune dystiscidienne Malgache. Le Naturaliste malgache 8: 75 - 80."]}
Databáze: OpenAIRE
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