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Description of two new species of the Exocelina broschii-group from Papua New Guinea, with revision and key to all representatives of this species group (Coleoptera, Dytiscidae, Copelatinae).

Shaverdo H, Sagata K, Balke M - Zookeys (2016)

Bottom Line: All described species of the group are revised and a key to their identification is provided.Important diagnostic characters (habitus, color, protarsomeres 4-5, median lobes, and parameres) are illustrated.Data on the distribution of all species of the group are given showing that its representatives occur only in Papua New Guinea and most of them are widely distributed in it central part.

View Article: PubMed Central - HTML - PubMed

Affiliation: Naturhistorisches Museum, Burgring 7, 1010 Vienna, Austria.

ABSTRACT
Two new species of Exocelina Broun, 1886 from Papua New Guinea are described herein: Exocelina mondmillensis sp. n. and Exocelina pseudomarinae sp. n. They are placed into the Exocelina broschii-group based on the shovel/fork-like ventral sclerites of their median lobe. While the former has rather distinct combination of the morphological characters (inconspicuous dorsal punctation, thin apex of the median lobe and ventral sclerite of the median lobe with two tips of different length), the latter is very similar to already described species Exocelina marinae (Shaverdo, Sagata & Balke, 2005). All described species of the group are revised and a key to their identification is provided. Important diagnostic characters (habitus, color, protarsomeres 4-5, median lobes, and parameres) are illustrated. Data on the distribution of all species of the group are given showing that its representatives occur only in Papua New Guinea and most of them are widely distributed in it central part.

No MeSH data available.


Exocelinamarinae (Shaverdo, Sagata & Balke, 2005), lateral (A–C) and ventral (D–F) views of median lobe. A, D Sandaun, Mianmin, PNG 196 B, E Sandaun, Mianmin area, PNG 234 C, F Southern Highlands, Tari to Koroba, PNG 65. Setae not shown.
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Figure 5: Exocelinamarinae (Shaverdo, Sagata & Balke, 2005), lateral (A–C) and ventral (D–F) views of median lobe. A, D Sandaun, Mianmin, PNG 196 B, E Sandaun, Mianmin area, PNG 234 C, F Southern Highlands, Tari to Koroba, PNG 65. Setae not shown.

Mentions: Variability: Beetles vary in size, kind of dorsal punctation (Figs 1–3), and shape of ventral sclerite of the median lobe (Fig. 9A–E). Dorsal punctation in great majority of the specimens is fine (Fig. 3), but some specimens have slightly coarser punctation, and very few (the types and one specimen from Simbai area, Madang, see Figs 1, 2) have distinct punctation, similar to that of Exocelinapseudomarinae sp. n. There are populations (e.g., from Simbai area, Madang, and Akameku-Brahmin, Eastern Highlands) with the left lobe of the ventral sclerite of the median lobe very narrow (Fig. 9A, B). However, this character is not very stable even in one population. Taking into consideration the other different shapes of the ventral sclerite observed (Figs 8B, 9C–E) as well as the fact that it is differently sclerotized in different specimens and because of that is variable in shape, we treated all the material as Exocelinabroschii. Such variability in shape of the ventral sclerite of the median lobe is also characteristic for other species of this group (Figs 9, 10, 12).


Description of two new species of the Exocelina broschii-group from Papua New Guinea, with revision and key to all representatives of this species group (Coleoptera, Dytiscidae, Copelatinae).

Shaverdo H, Sagata K, Balke M - Zookeys (2016)

Exocelinamarinae (Shaverdo, Sagata & Balke, 2005), lateral (A–C) and ventral (D–F) views of median lobe. A, D Sandaun, Mianmin, PNG 196 B, E Sandaun, Mianmin area, PNG 234 C, F Southern Highlands, Tari to Koroba, PNG 65. Setae not shown.
© Copyright Policy - creative-commons-attribution
Related In: Results  -  Collection

License
Show All Figures
getmorefigures.php?uid=PMC4829886&req=5

Figure 5: Exocelinamarinae (Shaverdo, Sagata & Balke, 2005), lateral (A–C) and ventral (D–F) views of median lobe. A, D Sandaun, Mianmin, PNG 196 B, E Sandaun, Mianmin area, PNG 234 C, F Southern Highlands, Tari to Koroba, PNG 65. Setae not shown.
Mentions: Variability: Beetles vary in size, kind of dorsal punctation (Figs 1–3), and shape of ventral sclerite of the median lobe (Fig. 9A–E). Dorsal punctation in great majority of the specimens is fine (Fig. 3), but some specimens have slightly coarser punctation, and very few (the types and one specimen from Simbai area, Madang, see Figs 1, 2) have distinct punctation, similar to that of Exocelinapseudomarinae sp. n. There are populations (e.g., from Simbai area, Madang, and Akameku-Brahmin, Eastern Highlands) with the left lobe of the ventral sclerite of the median lobe very narrow (Fig. 9A, B). However, this character is not very stable even in one population. Taking into consideration the other different shapes of the ventral sclerite observed (Figs 8B, 9C–E) as well as the fact that it is differently sclerotized in different specimens and because of that is variable in shape, we treated all the material as Exocelinabroschii. Such variability in shape of the ventral sclerite of the median lobe is also characteristic for other species of this group (Figs 9, 10, 12).

Bottom Line: All described species of the group are revised and a key to their identification is provided.Important diagnostic characters (habitus, color, protarsomeres 4-5, median lobes, and parameres) are illustrated.Data on the distribution of all species of the group are given showing that its representatives occur only in Papua New Guinea and most of them are widely distributed in it central part.

View Article: PubMed Central - HTML - PubMed

Affiliation: Naturhistorisches Museum, Burgring 7, 1010 Vienna, Austria.

ABSTRACT
Two new species of Exocelina Broun, 1886 from Papua New Guinea are described herein: Exocelina mondmillensis sp. n. and Exocelina pseudomarinae sp. n. They are placed into the Exocelina broschii-group based on the shovel/fork-like ventral sclerites of their median lobe. While the former has rather distinct combination of the morphological characters (inconspicuous dorsal punctation, thin apex of the median lobe and ventral sclerite of the median lobe with two tips of different length), the latter is very similar to already described species Exocelina marinae (Shaverdo, Sagata & Balke, 2005). All described species of the group are revised and a key to their identification is provided. Important diagnostic characters (habitus, color, protarsomeres 4-5, median lobes, and parameres) are illustrated. Data on the distribution of all species of the group are given showing that its representatives occur only in Papua New Guinea and most of them are widely distributed in it central part.

No MeSH data available.