Thalassarachna Packard 1871

• Main Author: Bartsch, Ilse
• Format: Text
• Language: unknown
• Published: Zenodo 2015
• Subjects: Biodiversity; Taxonomy; Animalia; Arthropoda; Arachnida; Trombidiformes; Halacaridae; Thalassarachna; Anadyr; Anadyr’; Arctic; Arctic Ocean; Bering Sea; Bingham; Giard; Lomonosova; Makarova; Mid-Atlantic Ridge; Newell; Pacific; White Sea; Anadyr'; Kamchatka; Mite
• Online Access: https://dx.doi.org/10.5281/zenodo.5696538; https://zenodo.org/record/5696538

Thalassarachna Packard, 1871 (Figs 76 –83) Type species. Acarus basteri Johnston, 1836. Adults. In both female and male GP and AP fused. Female GA with three to five pairs of pgs, genital sclerites with three to five pairs of sgs. Two to three pairs of gac often large and arranged in line (Figs 76, 81, 82; Thomae 1926: fig. 26; Bartsch 1976 c: fig. 26, 1998 b: fig. 122; Makarova 1978: fig. 6 GO female). Acetabula either almost equal-distanced or posterior pair slightly separated and enlarged. Ovipositor at rest extending beyond GO. Ovipositor with pair of basal and five pairs of apical genital spines; the latter in 2 + 3 arrangement, i.e. two anterior and three posterior pairs (Figs 77, 78). Genital spines spiniform, in T. basteri two anterior pairs of spines with delicate marginal denticles. Male GA with 40–160 slender pgs arranged scatteredly around GO. Male GO similar or slightly smaller than female GO. Genital sclerites with four to eight (nine) pairs of sgs, posterior pairs of sgs spiniform (Figs 79, 80). GO with two to three pairs of gac, these somewhat smaller than in female (Figs 79, 83). Acetabula in posterior part of GO, often immediately adjacent and with an opening to the exterior (Fig. 79; Makarova 1978: fig. 6, GO male; Bartsch 1996 b: fig. 31). AE of adults without epimeral pores. Juveniles. With a larval and one to two nymphal stages, in the former case only protonymphal stage present. GP and AP separated in both proto- and deutonymph. Deutonymphal GP with two pairs of pgs, two pairs of sgs and two pairs of internal gac (Bartsch 1976 c: fig. 40). Protonymphal GP with single pair of internal gac; neither pgs nor sgs present. Protonymph with small, larva with distinct, tube-like epimeral pores. Remarks. One of the ten female T. basteri studied has two pairs of basal but a single antero-apical pair of genital spines instead of vice versa. A similar arrangement is present in T. affinis (Makkaveeva 1966: fig. ovipositor, female) The deutonymphal stage is suppressed in T. dissimilis (Bartsch, 1979 b), assumedly also in T. hexacantha (Viets, 1927) and T. longipes (Trouessart, 1888). Of T. dissimilis both a female and a male were dissected from protonymphal skins (Bartsch 1979 b: p. 28), in T. hexacantha populations from the White Sea, larvae, protonymphs and adults were present, but no deutonymphs (Nikitina 2013), and in respect to T. longipes the protonymphal stage was commonly taken (Newell 1947: p. 128), but obviously no deutonymphal. In these three species both females and males bear two instead of three pairs of gac. The genus Thalassarachna is spread in the northern Pacific, Atlantic, and adjacent areas (Mediterranean, Black Sea, Baltic, Arctic Ocean); 14 species are described (Bartsch 2009 a). : 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 232, DOI: 10.11646/zootaxa.3919.2.1, http://zenodo.org/record/245246 : {"references": ["Packard, A. C. (1871) On insects inhabiting salt water. American Journal of Science, 3, 100 - 110. http: // dx. doi. org / 10.2475 / ajs. s 3 - 1.2.100", "Johnston, G. (1836) Illustrations in British zoology. Magazine of Natural History, 9 (63), 353 - 357.", "Bartsch, I. (1976 c) Zur Systematik und Verbreitung der Halacarellus - Arten (Halacaridae, Acari) an der Bretagne-Kuste. Entomologische Mitteilungen aus dem Zoologischen Museum Hamburg, 5, 97 - 109.", "Makarova, N. G. (1978) [Marine mites (Acarina, Halacaridae) from the intertidal zone of the Gulf of Anadyr (Bering Sea).] In: Kussakin, O. G. (Ed.), The intertidal zone of the Bering Sea and south-eastern Kamchatka. Publishing House Nauka, Moscow, pp. 131 - 149. [in Russian, with English summary]", "Bartsch, I. (1996 b) Halacarid mites (Acari) from the Mid-Atlantic Ridge. New records. Cahiers de Biologie Marine, 37, 159 - 167.", "Makkaveeva, E. B. (1966) K biologii Halacarellus basteri (Jochnston) v Cernom More. In: Raspredelnie bentosa I biologiya donnichzivotnich v juznach moryach. Akademia Nauk Ukrainskoi SSSR, Kiev, pp. 38 - 45.", "Bartsch, I. (1979 b) Halacaridae (Acari) von der Atlantikkuste Nordamerikas. Beschreibung der Arten. Mikrofauna des Meeresbodens, 79, 1 - 62.", "Viets, K. (1927) Die Halacaridae der Nordsee. Zeitschrift fur Wissenschaftliche Zoologie, 130, 83 - 173.", "Trouessart, E. L. (1888) Note sur les acariens marins recueillis par M. Giard au laboratoire maritime de Wimereux. Comptes Rendus de l'Academie des Sciences, Paris, 107, 753 - 755.", "Nikitina, M. P. (2013) Sezonnaja dinamika cislennosti i ziznennye cikly morskich klesci litoralnych fykoidov v okrestnostjach BBS. Moskovskii Gosudarstvennii universitet imeni M. B. Lomonosova. Biologiceskii fakultet, 207 - 210, Table 1.", "Newell, I. M. (1947) A systematic and ecological study of the Halacaridae of eastern North America. Bulletin of the Bingham Oceanographic Collection, 10, 1 - 232.", "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."]}