Difference between revisions of "Neobidessodes darwiniensis"
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but {{Lead | 1 | ...}} does. AP | but {{Lead | 1 | ...}} does. AP | ||
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| − | {{Lead | 1 | Length > 3.7 mm. Elytron with a subapical lateral | + | {{Lead | 1 | Length > 3.7 mm. Elytron with a subapical lateral flange, pronotal striae very weak, N WA, NT, N QLD |
| − | flange, pronotal striae very weak, N WA, NT, N QLD | result text = | + | | result text = ''grossus''}} |
| − | ''grossus''}} | + | {{Lead | 1- | Length < 3.7 mm |
| − | {{Lead | 1- | Length < 3.7 mm | 2}} | + | | 2}} |
| − | {{Lead | 2 | Elytron with a subapical lateral tooth, pronotal striae | + | {{Lead | 2 | Elytron with a subapical lateral tooth, pronotal striae well marked, WA, NT, QLD, N NSW |
| − | well marked, WA, NT, QLD, N NSW | result text = ''denticulatus''}} | + | | result text = ''denticulatus''}} |
| − | {{Lead | 2- | Elytron lacking lateral tooth, pronotal striae present | + | {{Lead | 2- | Elytron lacking lateral tooth, pronotal striae present or absent. |
| − | or absent. | 3}} | + | | 3}} |
| − | {{Lead | 3 | Pronotal striae absent. | 4 }} | + | {{Lead | 3 | Pronotal striae absent. |
| + | | 4 }} | ||
{{Lead | 3- | Pronotal striae present. | 5}} | {{Lead | 3- | Pronotal striae present. | 5}} | ||
| − | {{Lead | 4 | Length 2.55–2.65 mm, outline of junction of pronotum | + | {{Lead | 4 | Length 2.55–2.65 mm, outline of junction of pronotum and elytra smooth, sides of pronotum evenly curved, maximum width at posterior angles, dorsal colour pattern usually diffuse, N WA, NT, N QLD |
| − | and elytra smooth, sides of pronotum evenly curved, maximum width at | + | | result text = ''mjobergi'' }} |
| − | posterior angles, dorsal colour pattern usually diffuse, N WA, NT, N | + | {{Lead | 4- | Length 2.75–2.9 mm, outline of junction of pronotum and elytra slightly sinuate, maximum width of pronotum somewhat before base. Dorsal colour pattern strongly varying, when present, usually well marked. In some specimens pronotum yellow, in others pronotum and elytra all black, N WA, NT, N QLD |
| − | QLD | result text = ''mjobergi'' }} | + | | result text = ''thoracicus'' }} |
| − | {{Lead | 4- | Length 2.75–2.9 mm, outline of junction of pronotum and | + | {{Lead | 5 | Dorsal colour pattern diffuse. Pronotal striae well marked and long (1/4 to 1/3 of length of pronotum). |
| − | elytra slightly sinuate, maximum width of pronotum somewhat before | + | | 6}} |
| − | base. Dorsal colour pattern strongly varying, when present, usually | + | {{Lead | 5- | Contrasting yellowish markings on black elytra. Pronotal striae only slightly marked and short (maximum 1/4 of length of pronotum) |
| − | well marked. In some specimens pronotum yellow, in others pronotum and | + | | 7}} |
| − | elytra all black, N WA, NT, N QLD | result text = ''thoracicus'' }} | + | {{Lead | 6 | Body elongate oval. Pronotum as broad as elytra, outline of junction of pronotum and elytra slightly sinuate, maximum width of pronotum somewhat before base (Fig. 2). Males with mesotibia curved, length 2.2–2.25 mm, VIC, NSW, S QLD |
| − | {{Lead | 5 | Dorsal colour pattern diffuse. Pronotal striae well | + | | result text = ''bilita''}} |
| − | marked and long (1/4 to 1/3 of length of pronotum). | 6}} | + | {{Lead | 6- | Body broader oval. Pronotum narrower than elytra, outline of junction of pronotum and elytra smooth, sides of pronotum evenly curved, maximum width at posterior angles (Fig. 1). Male unknown, length 1.95 mm, smallest species of the genus, NT |
| − | {{Lead | 5- | Contrasting yellowish markings on black elytra. | + | | result text = ''darwiniensis'' }} |
| − | Pronotal striae only slightly marked and short (maximum 1/4 of length | + | {{Lead | 7 | Males with mesotarsus straight. Pronotal striae well marked but short, small species, length 2.0 mm, West Papua, Indonesia |
| − | of pronotum) | 7}} | + | | result text = ''samkrisi'' }} |
| − | {{Lead | 6 | Body elongate oval. Pronotum as broad as elytra, | + | {{Lead | 7- | Males with mesotarsus straight. Pronotal striae extremely weak and faint, larger species, length 2.35–2.65 mm, N WA, NT, N QLD. |
| − | outline of junction of pronotum and elytra slightly sinuate, maximum | + | | result text = ''flavosignatus''}} |
| − | width of pronotum somewhat before base (Fig. 2). Males with mesotibia | + | |
| − | curved, length 2.2–2.25 mm, VIC, NSW, S QLD | result text = | + | |
| − | ''bilita''}} | + | |
| − | {{Lead | 6- | Body broader oval. Pronotum narrower than elytra, | + | |
| − | outline of junction of pronotum and elytra smooth, sides of pronotum | + | |
| − | evenly curved, maximum width at posterior angles (Fig. 1). Male | + | |
| − | unknown, length 1.95 mm, smallest species of the genus, NT | result text = ''darwiniensis'' }} | + | |
| − | {{Lead | 7 | Males with mesotarsus straight. Pronotal striae well | + | |
| − | marked but short, small species, length 2.0 mm, West Papua, Indonesia | + | |
| − | | result text = ''samkrisi'' }} | + | |
| − | {{Lead | 7- | Males with mesotarsus straight. Pronotal striae | + | |
| − | extremely weak and faint, larger species, length 2.35–2.65 mm, N WA, | + | |
| − | NT, N QLD. | result text = ''flavosignatus''}} | + | |
{{Key End}} | {{Key End}} | ||
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Ordo: Coleoptera
Familia: Dytiscidae
Subfamilia: Hydroporinae
Tribus: Bidessini
Genus: Neobidessodes
Name
- Neobidessodes darwiniensis Hendrich & Balke, 2011 Wikispecies link ZooBank
Type locality
Harriet Creek at Kakadu Highway, 11 km NE Pine Creek, Northern Territory, Australia [13.74.4816S 131.89.7483E ]
Type material
Holotype: Female, “Australia: NT, Kakadu Hwy, Harriet Creek at Hwy Cross., 156m, 24.VIII.2006, 13.74S 131.89E, L. & E. Hendrich leg. (NT 14)”; “DNA M. Balke 3821” [green printed label]; “HOLOTYPE Neobidessodes darwiniensis sp.n. Hendrich & Balke 2010” [red printed label] (South Australian Museum, Adelaide).
DNA Sequences
3' cox1 sequence in GenBank: FR733592.1
Description
Measurements. TL = 1.95 mm, TL-H = 1.8 mm; MW = 1.0 mm. Colour. Antennae, palpi, head and most parts of pronotum reddish-brown, posterior angles of head, near eyes and base of pronotum in middle broadly dark brown. Elytron dark brown with some small vague yellow spots subbasally and subapically (Fig. 1). Ventral side, including legs and epipleura, reddish-brown, prosternal process and metacoxal plates somewhat darkened. Sculpture and structure. Elongate oval, sides well rounded. Maximum width at apical third of body. Segments of antennae short and stout. Head with relatively coarse punctures and strong microreticulation. Pronotum and elytron with rather dense, medium-sized punctures and weak to moderate microreticulation, finely pubescent. Pronotal striae deep and well marked, length almost 1/2 of that of pronotum, strongly incurved converging anteriad (Fig. 1). Elytra lacking basal and sutural striae. Underside with a few moderately large weak punctures at sides, midline of metaventrite with moderately dense smaller punctures. Metacoxal lines raised, well separated, weakly diverging anteriorly. Male. Unknown. Female. Pro- and mesotarsi simple. Inner edge of mesotibia nearly straight.
Affinities
DNA Sequence Data. The 3’ cox1 sequence available at FR733592.1 indicates that the new species is rather distinctive, the closest uncorrected p-distances in our database were other Neobidessodes species (c. 10.37%) and Limbodessus jundeensis (10.15%). - Morphology. The smallest species of the genus. On first view, the new species resembles in size and colour the common Hydroglyphus godeffroyi (Fig. 4) distributed all over northern Australia and New Caledonia, and can be easily overlooked in the field. When recognized as a Neobidessodes the new species is similar to N. mjobergi (Fig. 3) in coloration and to N. bilita (Watts, 1978) (Fig. 2) in size. From N. mjobergi it can be separated by its more broadly oval body, the much smaller size (N. mjobergi 2.55-2.65 mm) and unicolourus head, and from N. bilita by the darker dorsal surface, the short and stout segments of antennae, the rounded, broadly oval body, and the unflanged subapical part of the elytra (Figs 1, 2). Furthermore, N. bilita is a strictly south-eastern species with a disjunct distribution from southern Queensland to Victoria (Hendrich et al. 2009).
Remarks
Despite the fact that thousands of Neobidessodes were collected on three field trips to the Northern Territory and the Kimberley region, surprisingly only one specimen of N. darwiniensis appeared. Most of the expeditions took place during the dry period, between June and October, when most of the other species of the genus dominate the remaining rest pools and swamps. We assume N. darwiniensis is more common in or just after the rainy season, from November to April, as was observed for N. grossus (Hendrich et al. 2009).
Key
Habitat & Distribution
The single specimen was collected in one of the rest pools of a rocky creek, with gloomy water and at least partly shaded by smaller gum trees. The bottom consisted of coarse sand with a thick layer of unrotten leaves and twigs, no submerged or emergent vegetation visible (Figs 6, 7). Neobidessodes darwiniensis sp.n. was associated with the dytiscids Clypeodytes larsoni Hendrich and Wang, 2006, Hydroglyphus daemeli (Sharp, 1882), H. godeffroyi, H. grammopterus (Zimmermann, 1928), Hyphydrus contiguus Wehncke, 1877, H. lyratus Swartz, 1808, Laccophilus cingulatus Sharp, 1882, L. sharpi Régimbart, 1889, L. walkeri J. Balfour-Browne, 1939, Limbodessus compactus (Clark, 1862), Neobidessodes grossus (Zimmermann, 1922), N. mjobergi, N. thoracicus Hendrich and Balke, 2009, Sternopriscus alligatorensis Hendrich and Watts, 2004, S. aquilonaris Hendrich and Watts, 2004, Tiporus centralis (Watts, 1978), T. guiliani (Watts, 1978) and T. undecimmaculatus (Clark, 1862).
Original Description
- Hendrich, L.; Balke, M. 2011: A simultaneous journal / wiki publication and dissemination of a new species description: Neobidessodes darwiniensis sp. n. from northern Australia (Coleoptera, Dytiscidae, Bidessini). ZooKeys, 79: 11-20. doi ZooBank
Other References
- Hendrich, L.; Hawlitschek, O.; Balke, M. 2009: The epigean Australasian species of Neobidessodes gen.n. diving beetles—a revision integrating morphology, cybertaxonomy, DNA taxonomy and phylogeny (Coleoptera: Dytiscidae, Bidessini). Zootaxa, 2288: 1-41. Abstract & excerpt
