Exocelina marinae (Shaverdo, Sagata & Balke, 2005)

Shaverdo, Helena, Sagata, Katayo & Balke, Michael, 2016, Description of two new species of the Exocelinabroschii-group from Papua New Guinea, with revision and key to all representatives of this species group (Coleoptera, Dytiscidae, Copelatinae), ZooKeys 577, pp. 125-148 : 130

Taxon classification Animalia Coleoptera Dytiscidae

3. Exocelina marinae (Shaverdo, Sagata & Balke, 2005) Figs 5, 10

Papuadytes marinae Shaverdo, Sagata & Balke 2005: 272.

Exocelina marinae (Shaverdo, Sagata & Balke, 2005): Nilsson 2007: 34 (comb. n.); Toussaint et al. 2014: Supplementary figs 1-4, tab. 2 ( Exocelina marinae MB1291).

Type locality.

Papua New Guinea: Sandaun Province, trail from Telefomin to Eliptamin.

Type material studied.

Holotype: male "Papua N. G.: Sandaun Prov. Telefomin, 16.- 17.5.1998 trail to Eliptamin 1700-1800 m; leg. Riedel", "Holotypus Papuadytes marinae sp.n. des. H. Shaverdo, K. Sagata & M. Balke, 2005" (NHMW).

Additional material.

Sandaun: 4 males, 6 females "Papua New Guinea: Sandaun, Mianmin, 670m 20.x.2008, 4.53.292S 141.34.118E, Ibalim (PNG 191)", two males with additional green labels "DNA M.Balke 3733" and "DNA M.Balke 3734" (NHMW, ZSM). 2 females "Papua New Guinea: Sandaun, Mianmin (river), 990m, 23.x.2008, 4.54.570S 141.35.490E, Ibalim (PNG 192)", one of them with an additional green label "DNA M.Balke 3737" (ZSM). 1 male, 1 female "Papua New Guinea: Sandaun, Mianmin (pool), 990m, 23.x.2008, 4.54.570S 141.35.490E, Ibalim (PNG 193)", the female with an additional green label "M.Balke 3777 DNA" (ZSM). 2 males, 2 females "Papua New Guinea: Sandaun, Mianmin (river), 1080m, 24.x.2008, 04.55.780S 141.38.185E, Ibalim (PNG 195)", one male and one female with additional green labels "DNA M.Balke 3742" and "DNA M.Balke 3741", respectively (NHMW, ZSM). 1 male, 5 females "Papua New Guinea: Sandaun, Mianmin (pool), 1080m, 24.x.2008, 04.55.780S 141.38.185E, Ibalim (PNG 196)" (NHMW, ZSM). 1 female "Papua New Guinea: Sandaun, Mianmin (river), 700m, 21.x.2008, 04.52.858S 141.31.706E, Ibalim (PNG 197)" (ZSM). 1 female "Papua New Guinea: Sandaun, Mianmin area,>1000m, 26.xii.2009, Ibalim & Pius (PNG233)" (ZSM). 1 male, 5 females "Papua New Guinea: Sandaun, Mianmin area,>1000m, 23.12.2009, Ibalim & Pius (PNG234)", the male with an additional label "DNA M.Balke 4934" (NHMW, ZSM). 8 males, 7 females "Papua New Guinea: Sandaun, Mianmin area,>600m, 13.i.2010, Ibalim & Pius (PNG235)", one male and one female with additional labels "DNA M.Balke 4938" and "DNA M.Balke 4931", respectively (NHMW, ZSM). 1 male "Papua New Guinea: Sandaun, Mianmin area,>600m, 13.i.2010, Ibalim & Pius (PNG236)" (ZSM). 1 male, 1 female "Papua New Guinea: Sandaun, Mianmin area,>700m, 14.i.2010, 0 4 54.540S 141 36.953E, Ibalim & Pius (PNG238)", the female with an additional label "DNA M.Balke 4933" (ZSM).

Hela: 1 male "Papua New Guinea: Southern Highlands, Tari to Koroba, 1600m, 15.v.2006, 05.46.500S 142.50.000E, Balke (PNG 65)", "DNA M.Balke 1291" [green] (ZSM).

Additions to the description

(original description in Shaverdo et al. 2005, p. 270). Male: Median lobe with apex slightly curved in lateral view and more or less rounded in ventral view. Its ventral sclerite with unequal apical lobes: left lobe very long (very often with broken apex) and right lobe short, relatively narrow (Fig. 10).

Female: Without evident differences in external morphology from males, except for not modified protarsi and abdominal ventrite 6 without striae.

Variability: Beetles small to medium-sized: for Mianmin populations: TL-H 3.3-3.55 mm, TL 3.6-3.95 mm, MW 1.75-1.95 mm; for the holotype (Telefomin): TL-H 3.6 mm, TL 4.1 mm, MW 1.9 mm (Fig. 5); for the specimen from Tari-Koroba: TL-H 3.85 mm, TL 4.25 mm, MW 2.15 mm. Also beetles vary in shape of the median lobe and its ventral sclerite as shown in Fig. 10.

Distribution.

Papua New Guinea: Sandaun and Hela Provinces (Fig. 14). This species is mainly known from the south of Sandaun Province: Mianmin area. Based on the record from Tari-Koroba, we assume that the species occurs also further southeast.