Philaccolilus intania, Balke & Panjaitan & Surbakti & Shaverdo & Hendrich & Van Dam & Lam, 2022

Balke, Michael, Panjaitan, Rawati, Surbakti, Suriani, Shaverdo, Helena, Hendrich, Lars, Van Dam, Matthew H. & Lam, Athena, 2022, NextRAD phylogenomics, sanger sequencing and morphological data to establish three new species of New Guinea stream beetles, Alpine Entomology 6, pp. 51-64 : 51

Philaccolilus intania sp. nov.

Figs 2B, C , 3B , 4 , 5C , 6C, D , 8A, B , 10F

Type locality.

Tamrau Mts., Kebar, Bird’s Head Peninsula, West Papua.

Holotype.

Male. Indonesia, West Papua, above Kebar, forest creek, 720 m, 7.v.2015, -0,7831, 133,0721, UNIPA team (BH060) (MZB).

Paratypes.

(MZB, KSP, ZSM) 25 exs, same label data as holotype; 5 exs, Indonesia, West Papua, Tamrau Mts N of Kebar, forest stream, 750 m, 7.xi.2013, -0,7831, 133,0721, UNIPA team (BH033). Note. BH033 and BH060 are the same creek, sampled in different years and slightly different stream section (+/- 50 meters).

Description of holotype.

Medium sized member of the genus. TL 4.8 mm; TW 2.7 mm.

Color. Body surface black except for orange head as well as narrow, dark orange subbasal elytral band that not reaching lateral margin (Figs 2B, C , 3B ).

Structures. Hind margin of last ventrite emarginate in the middle (Fig. 8A ).

Genitalia. Median lobe of aedeagus as in Fig. 6C, D .

Female. Hind margin of last ventrite in the middle projected ("dwarf hat shape)" (Fig. 8B ).

Variation. Size variation of the paratypes is (N=12) TL 4.7-5.1 mm (av. 4.9 mm); TW 2.6-2.9 mm (av. 2.8 mm). Orange subbasal elytral band is dissolved into isolated dots in some specimens.

Etymology. Named after Sophia Intania Balke, daughter of first author. The species name is a noun in the nominative singular standing in apposition.

Comparative notes.

Distinguished from the other Philaccolilus species based on the following combination of features: body size; pronotum black; whole head orange; elytron only with a narrow, dark orange subbasal band not reaching the lateral margin (or only isolated spots in the position of the band); shape of median lobe (except for P. kirana , Fig. 6A, B ).

Distribution.

So far only known from the Tamrau Mts. in the north of the Bird’s Head Peninsula of New Guinea (Fig. 4 ).

Habitat.

Collected from a shaded forest stream, seen swimming on the sandy and gravelly bottom, in the current where pools form behind large rocks or underneath shallow cascades (Fig. 10F ). After about 50 meters, that stream fed into a larger river which is depicted in Fig. 9C . In that larger, more exposed river, we only found P. febrina .

Figures

Figure 2. A-G. Dorsal habitus of Philaccolilus species in the P. ameliae complex, as well as P. kirana and P. intania, appendages mostly removed; brightness of some paler spots digitally slightly enhanced for clarity, without altering the basic color tone; H. schematic drawings of color pattern variation in P. ameliae species complex, with explanation of elytral pattern positions (modified from Balke et al. 2000).

Figure 3. Lateral habitus of Philaccolilus species; brightness of some paler spots digitally slightly enhanced for clarity, without altering the basic color tone. A. P. kirana; B. P. intania; C. P. weylandensis (Weyland Mts., basal lateral spot clearly reaching elytral margin); D. P. weylandensis (Digul River, basal lateral spot vaguely reaching elytral margin); E. P. ameliae (Waaf, basal lateral spot clearly isolated from elytral margin).

Figure 4. Distribution of Philaccolilus species in New Guinea. Dots - P. ameliae complex, stars - P. kirana and P. intania here described from the Bird's Head Peninsula.

Figure 5. Results of the genomic nextRAD as well as mitochondrial DNA CO 1 data sequencing of Philaccolilus species in New Guinea. A. P. febrina in the Bird's Head Pensinsula; B. P. ameliae and P. weylandensis in New Guinea main body; C. P. kirana and P. intania from the Bird's Head Peninsula (localities see A). Results of the structuring analysis of nextRAD data depicted as barplots, the CO 1 data as haplotype network, subs. = substitutions.

Figure 6. Median lobe of aedeagus of Philaccolilus species A, B. P. kirana; C, D. P. intania.

Figure 8. Last male and female ventrite of Philaccolilus A, B. As in P. kirana and P. intania; C, D. As in P. ameliae, P. febrina and P. weylandensis. Not to scale. In C. with last and penultimate ventrites to illustrate the tuft of long golden setae on penultimate ventrite; E. P. febrina male in ventral view, not to scale.

Figure 9. A - D. Habitats of Philaccolilus febrina. A Stream more or less on level of valley floor, locality BH 62; B - D. Locality BH 61, open stream flowing out of Tamrau Mts. and feeding into the stream shown in Fig. 9 A.

Figure 10. Habitats of Philaccolilus species A-C. P. kirana and P. febrina locality BH 052; D. P. kirana BH 54; E. P. febrina BH 63; F. P. intania and P. febrina BH 60.