Phylacastus ancoralium, Lumen & Kamiński, 2023

Lumen, Ryan & Kaminski, Marcin Jan, 2023, Taxonomic revision of the genus Phylacastus Fairmaire (Tenebrionidae, Eurynotina): shortfalls of anatomical nomenclature with notes on aedeagal homology, ZooKeys 1138, pp. 1-27 : 1

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Phylacastus ancoralium

sp. nov.

Phylacastus ancoralium sp. nov.

Figs 1A View Figure 1 , 2A, B View Figure 2 , 3F View Figure 3 , 4B, G View Figure 4 , 5 View Figure 5 , 6C View Figure 6

Material examined

(data represents single specimens unless otherwise noted). Holotype (TMNH): " S.Afr.;E. Lesotho Hodson's Peak 300 m 29.37°S, 29.17°E; 11.3.1976;E-Y:1069 fr.und.stones, 3150 m leg. Endrödy-Younga.” With an additional label on red paper: " Holotype: Phylacastus ancoralium Lumen & Kaminski". GoogleMaps

Paratypes (n = 11) (TMNH and MIIZPAN): Two specimens with same data as Holotype (MIIZPAN). " S.Afr. Basutoland Makheke Mnts 15 miles ENE Mokhotlong. 8.IV.51 No. 268; Swedish South Africa Expedition 1950-1951; red label." (MIIZPAN), " S.Afr., Lesotho Drakensbg,Black Mt. 29.31°S, 29.12°E; 9.3.1976;E-Y:1060 from under stones leg. Endrödy-Younga.”, " S.Afr.;E. Lesotho Hodson’s Peak 300 m 29.37°S, 29.17°E; 11.3.1976;E-Y:1067 from under stones leg. Endrödy-Younga” (five specimens)., " S.Afr., E. Lesotho Sani Pass Valley 29.39°S, 29.12°E; 10.3.1976; E-Y:1066 from under stones leg. Endrödy-Younga” (two specimens) GoogleMaps .


Phylacastus ancoralium is highly modified compared with its congeners. In addition to its wide geographic separation from other species (Lesotho), it can be separated from all other species of Phylacastus via the elytra (with extremely weak to absent elytral striae), prosternum (weakly produced between forecoxae, rather than projecting more strongly beyond (Fig. 3E View Figure 3 )), aedeagus with ancorae on the ventral surface of the parameres (Fig. 4G View Figure 4 ), and ovipositor relatively short compared to other species (ratio of ovipositor coxites I-IV to paraprocts nearly 1:1, rather than more distinctly <1:1) (Fig. 5 View Figure 5 ).


This species is named for the ancorae of the male aedeagus, which in Blaptinae are hypothesized to anchor the male genitalia during copulation. To date, this is the only species within the subtribe Eurynotina with ancorae.


Length 6-7 mm. Head: punctures separated by ~1 feature diameter. Mentum midportion slightly narrowing apically, exposing lateral wings, midportion without distinct median carina. Prothorax: pronotum finely punctate, punctures widely spaced, separated by> 1 feature diameter. Hypomeron lightly wrinkled and finely punctate. Prosternal process weakly produced between forecoxae. Pterothorax: elytra width about equal to pronotal width. Elytral striae and intervals punctate; striae very weakly impressed or absent. Interval punctures fine and widely spaced (>1 feature diameter), distinctly smaller than strial punctures. Elytral tubercles absent. Abdomen: ventrite V sulcus narrowly separated from apical border. Terminalia: male: parameres tapering apically, fused basally with narrow opening at apex exposing median lobe. Each paramere bearing a small, ventral medial ancora. Female: Ratio of ovipositor coxites I-IV to paraprocts nearly 1:1. Bursa copulatrix not bilobate, accessory gland present near-to spermatheca, accessory pouch present.