Halacarus actenos Trouessart, 1889

Durucan, Furkan, Paz, Juan Carlos De La & Hernández-Teixidor, David, 2023, Halacaridae (Acari) from Tenerife (Canary Islands), Persian Journal of Acarology 12 (1), pp. 1-19 : 11-12

Halacarus actenos Trouessart, 1889

Material examined One male (FDHAL-21/12), La Barranquera ( Hypnea spinella , upper mid-littoral zone). Diagnosis

The male specimen measured 592 µm long to the tip of the frontal spine and 350 µm wide. General characters of this species are as follows. Frontal spine medium-sized; posterior part of AD slender; ds-1 on AD; ds-2 to ds-6 striated integument. Eye pigment arranged in a ring around cornea; pair of canaliculi in striated integument posterior to cornea; dorsum with pair of large corneae; PD completely absent. Apodemes between epimera I and II long. Epicuticula on plates and legs exquisitely reticulate. Male GA wide and rounded, covered by more than 60 setae ( Figs. 3H , 5E–G , 9A–E ).

Remarks

Halacarus actenos was reported from United Kingdom, Ireland, The Netherlands, French Atlantic coasts (Bay of Morlaix, Le Croisic, Baie de Port-lin, Arcachon, Saint Jean-de-Luz) and Spain (Galicia, Praia de Vidrieiro) ( Bartsch 2009). This species was also reported by the first author (FD) from Praia da Falésia (Albufeira, Portugal) (Durucan et al. 2018). The morphological characteristics, habitat preferences and body sizes of the specimens reported here fit the previous records by Bartsch (2011) and Durucan et al. (2018).

Figures

Figure 3. Light-microscope images of halacarid species from Tenerife – A. Agaue adriatica (female); B. Agauopsis brevipalpus (female); C. Agauopsis microhyncha (male); D. Agauopsis tricuspis (male); E. Copidognathus lamelloides (male); F. Copidognathus magnipalpus (male); G. Copidognathus remipes (male); H. Halacarus actenos (male); I. Halacarus subtilis (female) (Scale bars: 100 µm).

Figure 5. Light-microscope images of halacarid species from Tenerife – A & B. Agaue adriatica (female) – Medial view of: tarsus I (A), telofemur I (B); C & D. Agauopsis tricuspis (male) – Medial view of: tarsus I (C), telofemur I (D); E–G. Halacarus actenos (male) – tarsus IV (E), integument (F), tip of gnathosoma (G); Rhombognathus procerus: H & J – female, I & K – male, ventral view of gnathosoma (H), genital openings (I, J, K).

Figure 9. Halacarus actenos Trouessart, 1889 (male) – A. Dorsal view of idiosoma; B. Ventral view of idiosoma; C. Lateral view of palp; D. Chelicera; E. Medial view of leg I (Scale bars: A, B, E: 100 µm, C, D: 50 µm).