Trends in Acarology Proceedings of the 12th International Congress
Acari are everywhere and acarologists go after them — some aiming to explore the bewildering diversity of the mites and ticks, others trying to understand the how and why of their being. For the past 50 years, the International Congress of Acarology has b
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Details of reproduction, development, and sexual behaviour are known only for a few water mite species, mostly from standing water. This study reports laboratory observations on 20 species from two small streams in North Germany. Ovigerous females carried between 1.4 (Aturus fontinalis) to 69 eggs (Sperchon setiger). In most species, eggs were laid consecutively in distinct clutches, generally with 12 months (female 34 months)
Duration of developmental stages/life span
ind. sperm transfer during a pairing position, small fields of 10-15 spermatophores, behaviour see text; Proctor (1992): expectation of ind. sperm transfer during a pairing position; Lundblad (1929a): for A. scaber speculation of direct sperm transfer during copulation; Smith & Oliver (1986): for Aturus observation of a mating position
ind. sperm transfer by spermatophores Smith & Oliver (1986): expectation of ind. sperm transfer; Schwoerbel (1967): for Ljania bipapillata subsp. and other Ljania species: direct sperm transfer by copula
unknown; Smith & Oliver (1986) for Wettina: expectation of direct sperm transfer
unknown Motas (1928) for F. setigera: direct sperm transfer by copulation; Efford (1965): no such observation
ind. sperm transfer by spermatophores; documented spermatophore: Ullrich (1976)
ind. sperm transfer by spermatophores, duration of spermatophore deposition: about 20 s Ullrich (1976): deposition also in the absence of female; documented spermatophore: Ullrich (1976)
unknown
unknown
unknown
ind. sperm transfer by spermatophores
deposition also in the absence of female documented spermatophore: Efford (1966)
Sexual behaviour
Peter Martin
Reproduction, development, and sexual behaviour of stream-inhabiting water mites Table 2 Mean dorsal length (μm) of idiosoma of larvae, nymphs and adults of 13 water mite species. n, sample size. Larvae Nymphs Males Females Water mite species Mean (range) n Mean (range) n Mean (range) n Mean (range) Protzia eximia 201 (135-288) 98 493 (312-608) 7 746 (686-827) 17 1,003 (780-1,186) Sperchonopsis verrucosa 195 (173-243) 25 421 (203-608) 219 593 (359-780) 568 749 (374-998) Sperchon clupeifer 237 (160-396) 23 457 (296-640) 30 605 (530-655) 9 775 (437-1,123) Sperchon setiger 201 (180-336) 13 623 (452-749) 21 710 (468-1,123) 127 1,070 (515-1,513) Sperchon thienemanni 258 (208-328) 29 425 (218-702) 363 778 (421-1,123) 432 892 (390-1,295) Lebertia fimbriata 315 (272-392) 67 390 (312-468) 4 768 (655-967) 4 964 (936-998) Lebertia glabra 325 (256-404) 265 493 (312-702) 195 720 (562-1,295) 91 859 (577-1,170) Hygrobates nigromaculatus 305 (276-344) 213 493 (281-733) 33 1,163 (811-1,420) 64 1,145 (764-1,638) Atractides nodipalpis 271 (224-316) 472 406 (234-671) 121 562 (374-686) 254 733 (452-1,076) Feltria rouxi 181 (153-205) 214 230 (203-281) 4 293 (281-312) 5 406 (374-437) Wettina podagrica 256 (233-348) 53 437 1 602 (515-780) 45 724 (484-877) Ljania bipapillata 238 (210-296) 43 365 (250-515) 59 504 (452-546) 157 610 (499-686) Aturus fontinalis 198 (163-228) 853 312 (218-437) 239 374 (265-452) 113
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