Actacarus Schulz 1937

• Main Author: Bartsch, Ilse
• Format: Text
• Language: unknown
• Published: Zenodo 2015
• Subjects: Biodiversity; Taxonomy; Animalia; Arthropoda; Arachnida; Trombidiformes; Halacaridae; Actacarus; Antarctic; Galapagos; Seta; Noire; Newell; Antarc*; Mite
• Online Access: https://dx.doi.org/10.5281/zenodo.5696434; https://zenodo.org/record/5696434

Actacarus Schulz, 1937 (Fig. 7) Type species. Actacarus pygmaeus Schulz, 1937. Adults. GP and AP fused. Female GA with two to three (to five) pairs of smooth pgs. Subgenital setae lacking. GO in posterior part of GA. Ovipositor at rest extending beyond GO, in some species even beyond anterior margin of GA. Everted ovipositor apically with pair of slender, seta-like anterior and seven posterior genital spines. These spines setiform (Konnerth-Ionescu 1970: pl. 1 E) or dissimilar in shape, hooked and spiniform (Bartsch 1999 a: figs 18, 19; Schulz 1937: fig. 1 C). Spines weakly sclerotized. Acetabula small, from almost equal- to unequal-sized, three pairs about level with mid-GO (Fig. 7; Abé 1990 a: fig. 2 F, 1997: fig. 4 E; Newell 1984: fig. 703). GO in male slightly smaller than in female and removed from posterior margin of GA. GA with 7–18 pairs of slender, smooth pgs situated either close around GO or lateral and posterior to GO; one pair of setae outlying. Each genital sclerite with one to three sgs. GO with three pairs of small acetabula (Abé 1997: fig. 4 F). AE in both male and female without epimeral pores. Juveniles. A larval and two nymphal stages known. Deutonymph with GP and AP partly or completely separated (Bartsch 1977 b: fig. 104; Abé 1997: fig. 4 G) or fused (Bartsch 1977 b: fig. 104, 1999 a: fig. 23; Abé 1990 a: fig. 4 B). Deutonymphal GP with two pairs of internal gac and two pairs of pgs; sgs lacking. In protonymph GP and AP fused (Abé 1990 a: fig. 5 B; Bartsch 1999 a: fig. 25). Protonymphal GA with single pair of internal gac; pgs and sgs not developed. Larva with large anal plate. Epimeral pores vestigial or lacking (Bartsch 1977 b: fig. 106, 1999 a: fig. 27; Abé 1990 a: fig. 6 B). Remarks. Actacarus species are inhabitants of sandy deposits; 24 species are known to date (Bartsch 2009 a). The genus is spread world-wide in tropical, warm- and cold-temperate regions. : Published as part of Bartsch, Ilse, 2015, The genital area of Halacaridae (Acari), life stages and development of morphological characters and implication on the classification, pp. 201-259 in Zootaxa 3919 (2) on page 207, DOI: 10.11646/zootaxa.3919.2.1, http://zenodo.org/record/245246 : {"references": ["Schulz, E. (1937) Actacarus pygmaeus n. g., n. sp., eine merkwurdige Meeresmilbe aus der Otoplanen-Zone der Nordsee. Kieler Meeresforschungen, 1, 327 - 331.", "Konnerth-Ionescu, A. (1970) Nouvelles donnees sur les halacarides de la zone psamicole du littoral roumain de la Mer Noire. Travaux du Museum d'Histoire Naturelle Grigore Antipa, 10, 19 - 23.", "Bartsch, I. (1999 a) Actacarus ponticus, a new marine mite from the Black Sea (Arachnida: Acari: Halacaridae). Senckenbergiana Biologica, 78, 141 - 151.", "Abe, H. (1990 a) Two species of the genus Actacarus (Acari, Halacaridae) from Japan. Zoological Science, 7, 111 - 126.", "Newell, I. M. (1984) Antarctic Halacaroidea. Antarctic Research Series, 40, 1 - 284. http: // dx. doi. org / 10.1029 / AR 040", "Abe, H. (1997) Halacarid mites of the genus Actacarus (Acari: Halacaridae) from Hokkaido, Northern Japan. Species Diversity, 2, 31 - 42.", "Bartsch, I. (1977 b) Interstitielle Fauna von Galapagos. XX. Halacaridae (Acari). Mikrofauna des Meeresbodens, 65, 1 - 108.", "Bartsch, I. (2009 a) Checklist of marine and freshwater halacarid mite genera and species (Halacaridae: Acari) with notes on synonyms, habitats, distribution and descriptions of the taxa. Zootaxa, 1998, 1 - 170."]}