Madaglymbus kelimaso, Ranarilalatiana, Tolotra & Bergsten, Johannes, 2019

Ranarilalatiana, Tolotra & Bergsten, Johannes, 2019, Discovery of a specialist Copelatinae fauna on Madagascar: highly ephemeral tropical forest floor depressions as an overlooked habitat for diving beetles (Coleoptera, Dytiscidae), ZooKeys 871, pp. 89-118 : 101-102

Madaglymbus kelimaso sp. nov. Figs 1E , 3B

Type locality.

Analalava Reserve [17.70532S, 49.45702E] (Madagascar, Atsinanana region, Toamasina II)

Type material.

Holotype ♂ GP (NHRS): // NHRS-JLKB | 000065449 // Madagascar: Toamasina II: Analalava | reserve: MAD17-06: Taniravo track: | S-17.70548; E49.45934; 52 m: forest | pools: 06/03/2017; Leg. T. | Ranarilalatiana // Holotype | Madaglymbus kelimaso sp. nov. | Det. Ranarilalatiana | & Bergsten, 2019 //

Paratypes: -2♀, 2♀ (Alc.) (NHRS): // NHRS-JLKB | 0000654450-1, 65452 (Alc.) // Madagascar: Toamasina II: Analalava | reserve: MAD17-06: Taniravo track: | S-17.70548; E49.45934; 52 m: forest | pools: 06/03/2017; Leg. T. | Ranarilalatiana // Paratype | Madaglymbus kelimaso sp. nov. | Det. Ranarilalatiana | & Bergsten, 2019 //

-3♀, 4♀ (Alc.) (NHRS): // NHRS-JLKB | 000065460-2, 65463 (Alc.) // Madagascar: Toamasina II: Analalava | reserve: MAD17-08: Lemur track: | S-17.70553; E49.45506; 64 m: forest | pools: 07/03/2017; Leg. T. | Ranarilalatiana // Paratype | Madaglymbus kelimaso sp. nov. | Det. Ranarilalatiana | & Bergsten, 2019 //

-1♂ GP, 4♀, 1♂ (Alc.), 8♀ (Alc.), (NHRS): // NHRS-JLKB | 000065464-8, 65469 (Alc.) // Madagascar: Toamasina II: Analalava | reserve: MAD17-09: N of nursery | plants: S-17.70532; E49.45702; 75 m: | forest pools: 08/03/2017; Leg. T. | Ranarilalatiana // Paratype | Madaglymbus kelimaso sp. nov. | Det. Ranarilalatiana | & Bergsten, 2019 //

-1♀, 1♀ (Alc.) (NHRS): // NHRS-JLKB | 000065454, 65455 (Alc.) // Madagascar: Toamasina II: Analalava | reserve: MAD17-10: N of nursery | plants: S-17.70812; E49.45171; 84 m: | forest pools beside Lemur track: | 08/03/2017; Leg. T. Ranarilalatiana // Paratype | Madaglymbus kelimaso sp. nov. | Det. Ranarilalatiana | & Bergsten, 2019 //

-1♂ GP, 1♀, 1♀ (Alc.) (NHRS): // NHRS-JLKB | 000065457-8, 65459 (Alc.) // Madagascar: Toamasina II: Betampona | RNI: MAD17-01: Vohimarangitra: | S-17.91604; E49.19986; 525 m: Dried | up forestpools in preaseape track: | 01/03/2017; Leg. T. Ranarilalatiana // Paratype | Madaglymbus kelimaso sp. nov. | Det. Ranarilalatiana | & Bergsten, 2019 //

-1♂ (Alc.) (NHRS): // NHRS-JLKB | 000065453 // Madagascar: Toamasina II: Betampona | RNI: MAD17-04: NW of park entrance: | S-17.93059; E49.20261; 321 m: Dried | up pools in Patsitsatra stream: | 03/03/2017; Leg. T. Ranarilalatiana // Paratype | Madaglymbus kelimaso sp. nov. | Det. Ranarilalatiana | & Bergsten, 2019 //

-1 ♂ GP (NHRS): // NHRS-JLKB | 000065789 // Madagascar: Toamasina: Atsinanana | Betampona RNI: lowalt rainforest | Path PPR, ca 100 m in from path PP | Dried out forest floor depression | MAD18-66: 24.II.2018 | 17.9160S, 49.1999E, 520 m | Leg. J. Bergsten & T. Ranarilalatiana // Paratype | Madaglymbus kelimaso sp. nov. | Det. Ranarilalatiana | & Bergsten, 2019 //

Diagnosis.

A small, elongate but rather robust Madaglymbus species with reddish coloration on head and pronotum and subrugose elytra with basal and apical testaceous spots ( Fig. 1E ). Penis evenly narrowing from base to apex in lateral view, non upturned at apex. Penis with bisinuate left side in ventral view and an apical knob is present in both ventral and lateral views ( Fig. 3B ). Parameres with a long and thin apical extension ( Fig. 3B ).

Description.

Body length: 3.9-4.8 mm (♀: 3.9-4.5 mm, ♂: 4.2-4.8 mm).

Body shape elongate, subparallell and rather convex. Lateral outline non-continuous between pronotum and elytra. Head broad with small eyes creating a wide interocular distance ( Fig. 1E ).

Pronotum and head rufotestaceous, infuscated inside eyes and slightly medially on pronotum. Elytra infuscated but with basal and apical testaceous spots. All appendages testaceous.

Elytra with longitudinal subugosity formed by shorter and longer strioles, sometimes connected to form longer continuous lines. Pronotum densely covered with large punctures and with a narrow lateral bead not reaching anterior corners. Head covered with finer punctation. Head, pronotum and elytra with same type of microreticulation and micropunctures.

Ventral side entirely testaceous, metacoxal lines absent but suggested ridge present in their place, metacoxal plate and abdominal sternites II–IV with fine strioles. Anterior metaventral process narrow.

Male pro and mesotarsal segments I–III broadly dilated and ventrally equipped with adhesive discs (constellation I:5 (row 1), 4 (row 2), II:4, III:4). Anterodistal angle of protarsal segment IV with a modified stout seta.

Bilobed penis with an apical knob visible in both lateral and ventral views, ventral lobe ending on right side well before apical knob of dorsal lobe. In lateral view apex not upturned ( Fig. 3B ). In ventral view left side bisinuate ( Fig. 3B ). Parameres with a long and thin apical extension ( Fig. 3B ).

Female with similar dorsal subrugosity as in male.

Distribution.

Known from Analalava reserve and Betampona RNI, eastern lowland Madagascar ( Fig. 4C ).

Ecology and conservation.

Madaglymbus kelimaso sp. nov. was found in lowland humid forests (50-550 m alt.). Most of the type specimens were found in Analalava reserve in forest pools with dead leaves, stagnant pools filled with water immediately after a cyclone with heavy rain ( Fig. 11 ).

Analalava reserve is managed through collaboration between a local people NGO (Velonala) and Missouri Botanical Garden (MBG) since 2004. In 2015, it was designated as a new protected area. It covers 225 ha of typical littoral humid forest and represents one of few remaining forest fragment on the lowland central east coast of Madagascar. One specimen was collected in the same terrestrial habitat as C. betampona sp. nov. ( Fig. 5 ).

Etymology.

The Malagasy word “kelimaso” means small eyes (keli = small, maso = eye), a characteristic of this species and seemingly an adaptation to spending significant amount of time out of water in the ground litter layer (three of five terrestrial dytiscid species are eyeless).

Figures

Figure 1. Habitus, dorsal view. A Copelatus amphibius sp. nov. (female) B Copelatus zanatanensis sp. nov. (female) C Copelatus betampona sp. nov. (female) D Madaglymbus semifactus sp. nov. (female) E Madaglymbus kelimaso sp. nov. (male) F Madaglymbus menalamba sp. nov. (female).

Figure 3. Male genitalia. From left to right aedeagus in right lateral, ventral, left lateral views, and left paramere. A Madaglymbus semifactus sp. nov. B Madaglymbus kelimaso sp. nov. C Madaglymbus menalamba sp. nov.

Figure 4. Maps of Madagascar with species distributions and administrative divisions. A Copelatus amphibius sp. nov. (circle), Copelatus betampona sp. nov. (square) B Copelatus zanatanensis sp. nov. (circle), Madaglymbus semifactus sp. nov. (square) C Madaglymbus kelimaso sp. nov. (circle), Madaglymbus menalamba sp. nov. (square) D current 22 regions and six former provinces of Madagascar.

Figure 5. Habitat photo of locality MAD 18 - 66, Betampona RNI. The three new species Madaglymbus kelimaso sp. nov., Madaglymbus semifactus sp. nov., and Copelatus betampona sp. nov. were found in this terrestrial habitat.

Figure 11. Habitat photo of locality MAD 17 - 08, Analalava reserve, where the new species Madaglymbus kelimaso sp. nov. was found. These depressions were water-filled at time of visit 2017, immediately following a cyclone with heavy rain.