Copelatus (Ivohibe and North of Toamasina): sp. 3

Ranarilalatiana, Tolotra, Raveloson Ravaomanarivo, Lala Harivelo & Bergsten, Johannes, 2019, Taxonomic revision of the genus Copelatus of Madagascar (Coleoptera, Dytiscidae, Copelatinae): the non- erichsonii group species, ZooKeys 869, pp. 19-90: 19

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Copelatus (Ivohibe and North of Toamasina): sp. 3


Copelatus (Ivohibe and North of Toamasina): sp. 3   Fig. 9D View Figure 9

Material studied.

Fianarantsoa. Ihorombe: Ivohibe: -3♀ ( NHRS): // NHRS-JLKB | 000010856, 65699, 65734 // Madagascar: Fianarantsoa: Ihorombe: R.S. Pic | d’Ivohibe: Andaranovory: close to botanical | transect R.S. Pic d’Ivohibe: S22.47511667 | E046.9559, 1106 m, 10.XII.2013, GB Nets and | sieves: small lake with dead leaves and | vegetation, Leg. J.H. Randriamihaja & | T. Ranarialalatiana: Field# MAD13-61 // Copelatus sp. nov. | C. insuetus complex | Det. Ranarilalatiana | & Bergsten, 2019 // Toamasina. Atsinanana: Toamasina, Toamasina II: -1♀ ( NHRS): // NHRS-JLKB | 000010811 // Madagascar: Toamasina II: Analalava | reserve: MAD17-12: S of nursery plants: | S17.71055; E49.45002; 39 m: Forest | stream with side pools: 09/03/2017; | Leg. T. Ranarilalatiana // Copelatus sp. nov. | C. insuetus complex | Det. Ranarilalatiana | & Bergsten, 2019 // -1♀ ( NHRS): // NHRS-JLKB | 000010779 // Madagascar: Toamasina: | Antsinanana: RN2, 6Km N | Toamasina by bridge: S18.06493 | E049.37856, 0 m. 15.XI.2011, | GB Nets and sieves: river and | sidepool: Field# MAD11-52 // Leg. J. Bergsten, R. | Bukontaite, T | Ranarilalatiana & | J.H. Randriamihaja // Copelatus sp. nov. | C. insuetus complex | Det. Ranarilalatiana | & Bergsten, 2019 //


The DNA data revealed that these females represent one or possibly two additional new species in the C. insuetus   complex ( Figs 2 View Figure 2 , 3 View Figure 3 ). In fact, the CO1 data reveals that they are the most divergent in that group and are sister to a clade with all the other species: C. insuetus   , C. vokoka   , C. kely   , and C. ankaratra   . The genetic distance between members of these two clades ranges from a minimum of 4.5% to a maximum of 7.1%, strongly indicating a separately evolving unit. The genetic distance between the specimens from Ivohibe and those from north of Toamasina was 2.3-2.4% (K2P), a distance that does not rule out conspecificity as the geographic and altitudinal distance are substantial between these localities (for distribution see Fig. 12C View Figure 12 ). It is also on the same level as the intraspecific distance found within C. ankaratra   between a peak population and a population at lower altitude of the Ankaratra Massif between which we do not find any morphological character differences to justify further separation. On the other hand, C. kely   and C. insuetus   are indistinguishable based on CO1 squences alone ( Figs 2 View Figure 2 , 3 View Figure 3 ). We refrain from describing these as a new species since the shape of male genitalia is very important for identification in this group. Morphologically we note the following based on the females: in body size this species is similar to C. vokoka   , slightly larger than C. kely   but slightly smaller than C. insuetus   and C. ankaratra   . Compared with females of C. vokoka   , Copelatus   sp. 3 has a narrower testaceous basal band, flatter elytral intervals between striae, and more limited striolation on pronotum, restricted to posterolateral corners. Copelatus ankaratra   can be distinguished based on its dark colour and extremely elongate body shape. Small C. insuetus   females can often be distinguished on the posteriorly extended testaceous basal medial band. It is most difficult to distinguish Copelatus   sp. 3 females from large female specimens of C. kely   .