Ancyronyx henningi, Freitag & Kodada, 2017

Freitag, Hendrik & Kodada, Ján, 2017, A taxonomic review of the genus Ancyronyx Erichson, 1847 from Sulawesi (Insecta: Coleoptera: Elmidae), Journal of Natural History (J. Nat. Hist.) 51 (9 - 10), pp. 561-606 : 593-596

publication ID

https://doi.org/ 10.1080/00222933.2017.1285447

publication LSID

lsid:zoobank.org:pub:0E11E48A-CE03-4D6F-B2F9-B83EEFA0790F

persistent identifier

https://treatment.plazi.org/id/41EC45C9-0374-46FF-BB8E-6E4DC5EC46C8

taxon LSID

lsid:zoobank.org:act:41EC45C9-0374-46FF-BB8E-6E4DC5EC46C8

treatment provided by

Carolina

scientific name

Ancyronyx henningi
status

sp. nov.

Ancyronyx henningi View in CoL sp. nov.

( Figures 3 View Figure 3 (a,b) 5(a–g); 14(a–d); 18; 19(a,f))

Type locality

A mountain brook flowing through grassland with submerged wood, road km 32 Tentena-Gintu, ca. 1600 m a.s.l., ca. 01°48′10′′ S, 120°28′ 10 E, Central Sulawesi, Indonesia GoogleMaps .

Type material

Holotype ♂ ( NMW): ‘ INDONESIA: C Sulawesi, Rd. Km 32 Tentena-Gintu ; mountain creek, grassland; submerged wood, c. 1600 m a.s.l., c. 01°48′10′′ S, 120°28′10′′ E 04 Jan.1998 leg. Freitag (Sul13f)’, terminal parts of abdomen and aedeagus glued separately, two tarsi lacking GoogleMaps . Paratypes: 15 ♂♂, 12 ♀♀ ( NMW, CFM [FR123]): same data as holotype; 6 ♂♂, 7 ♀♀ ( CKB, CFM): ‘ INDONESIA: C Sulawesi, Rd GoogleMaps . Km 29Tentena-Gintu; mountain creek; rock surface, boulders, c. 1380 m a.s.l., c. 01°47′50′′ S, 120°28′50′′ E 04 Jan.1998 leg . Freitag (Sul 12 g)’; 8 ♂♂, 3 ♀♀ ( NMW, CFM [FR122]): ‘ INDONESIA: C Sulawesi, 3.7 km N Tentena; calcerous Saluopa Falls ; limestone, sec . veget.; c. 520 m a.s.l., c. 01°44′ S, 120°39′ E 04 Jan.1998 leg . M . Henning (Sul 18 g)’.

Diagnostic description

Body 1.32–1.50 mm long, 2.1–2.2 times as long as wide ( BL / EW); EW: 0.61–0.70 mm.

Colouration Figure 3 View Figure 3 (a,b). Very dark species. Elytra dark brown; pronotum and head black; elytral patches usually not discernible; if ever, hardly visible small paler spots are present at humerus and median anterior elytra ( Figure 3 View Figure 3 (b)).

Head. ( Figure 5 View Figure 5 (a,b)) 0.36–0.39 mm wide; ID: 0.20–0.22 mm; antennae about as long as head width, terminal segment with digitiform sensillum ( Figure 5 View Figure 5 (g)); gular sutures separate.

Thorax. Pronotum 0.42–0.48 mm long ( PL), 0.47–0.50 mm wide ( MW); surface strongly rugulose ( Figure 5 View Figure 5 (a)); punctures deeply impressed. Elytra 1.4–1.5 times as long as wide; EL: 0.92–1.05 mm, EW: 0.62–0.70 mm; punctures large and deeply impressed ( Figure 5 View Figure 5 (e)). Mesoventrite anteriorly microreticulate/microstriate ( Figure 5 View Figure 5 (b)). Anepisternum 3 rugulose. Legs slightly shorter than body.

Abdomen. Ventrites 1–4 with flat cordiform granules ( Figure 5 View Figure 5 (c,d)); granules moderately dense, sparse and small in central portion, larger and denser on sides, interstices shiny; ventrite 5 densely covered with granules. Male sternite IX ( Figure 14 View Figure 14 (a)) 390 μm long; apical portion narrow; apical margin emarginate, laterally with few short setae; paraprocts unequal in size, not reaching apical margin; anterior strut short.

Aedeagus ( Figure 14 View Figure 14 (b,c)) broad, elongate, 425 µm long. Median lobe long and conical (105 µm wide basally, 85 µm wide near middle); lateral margins slightly convex, gently (at apex distinctly) bent ventrad; ventral sac prominent, reaching apical 0.1; fibula moderately sclerotized, broad; corona inconspicuous. Phallobase obliquely prolonged anteriad, strongly sclerotized. Parameres long, inflated in distal half, strongly narrowed near middle, with more than 25 moderately long setae in apical half.

Ovipositor ( Figure 14 View Figure 14 (d)), total length 450 µm. Stylus moderately long, bent laterad, broader apically; apex with peg-like setae. Coxite moderately long and slender; setae dimorphic, elongate peg-like, pointed at distal portion and broad spine-like, acute at basal portion; cluster of spine-like setae at basal portion; mesal margin with dense, fine pubescence. Valvifer about 1.3 times as long as coxite.

Distribution

The species is known from localities in Central Sulawesi ( Figures 18 View Figure 18 ; 19 View Figure 19 (a,f)).

Etymology

The species is named for Matthias Henning (Bernburg, Germany), who collected this species.

Comments

This species somewhat resembles externally A. breviparamerus , but is smaller and darker (rarely with inconspicuous anterior elytral patches only). Generally it differs from all its congeners from Sulawesi by the peculiarly large and deeply impressed elytral punctures and the coarsely sculptured pronotum. In addition, its parameres are characterized by their short length as well as by the numbers and position of the setae.

The usual dark morph (from the type locality, c. 1600 m a.s.l.) is illustrated in Figure 3 View Figure 3 (a). In Figure 3 View Figure 3 (b), a slightly smaller specimen from a collection site at lower altitude (c. 520 m a.s.l.) is illustrated that displays the rarer colour morph with paler legs and faint elytral spots. However, the latter colour morph was also found at high altitude sites, while the trend of slightly smaller body size (1.32–1.39 mm) is evident for specimens of the lower site irrespective of their colouration.

Ancyronyx henningi seems to be less specialized to a certain microhabitat. It was collected from different microhabitats (submerged wood, rock surface), in presumably acidic (type locality) as well as alkaline, calcerous waters ( Figure 19 View Figure 19 (f)) and at a comparably wide range of altitudes from 500 m to 1600 m a.s.l.

NMW

Naturhistorisches Museum, Wien

PL

Západoceské muzeum v Plzni

MW

Museum Wasmann

Kingdom

Animalia

Phylum

Arthropoda

Class

Insecta

Order

Coleoptera

Family

Elmidae

Genus

Ancyronyx

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