Reports of medico-zoological investigations in the Nansei Islands : Part IV. Three new trombiculid mites of the genus Doloisia from the Amami Island (Prostigmata; Trombiculidae)

Abstract

Three new trombiculid mites of the genus Doloisia from Amami Island, Japan are figured and described. These are D. minamii n. sp. and D. satoiana n. sp. that were collected from nest holes of Amami Spinous Country-rat, Tokudaia oshimensis oshimensis (Abe, 1933), and from soil under rocks as unengorged larvae. D. zentokii n. sp. was collected from Black rat, Rattus rattus and Amami Spinous Country-rat. Doloisia (Doloisia) minamii Suzuki, n. sp., Fig. 1 A-G Diagnosis of larva : This species is related to D. satoiana Suzuki, n. sp. and D. okabei (Sasa et al., 1952), but differs from them in one or more of the following characters : palpal formula, shape of sensillae, shape and dimensions of scutum, number of coxal setae and number of dorsal setae. Measuring 190μm×130μm when unengorged of 10 paratypes. Palpal formula B/B/NBB+4B・N, eyes 1+1,small. Galeal seta nude. Scutum roughly triangle. Sensilla fusiform, AL setae nude or weakly barbed (Fig. 1). Scutal measurements as in Table 1. Dorsal setae 40 to 44 in total, arranged 4-10-8-8-8-2,sternal setae 2-2. Coxal setae I was 3 rarely 4,II, 5 rarely 4,III, 9 to 12 usually 12. Specialized setae on legs as in Fig. 1,G. Leg I : Length of tarsus, 50μm; a long mastifemorala, 2 genualae, 1 microgenuala, 2 tibial spurs, 1 microtibiala, 1 pretarsala, 1 subterminala, 1 parasubterminala, 1 tarsal spur, 1 microtarsala. Leg II : Length of tarsus, 42μm; 1 genuala, 1 tibial spur, 1 tibiala, 1 pretarsala, 1 tarsal spur, 1 microtarsala. Leg III : Length of tarsus, 55μm; 1 genuala. This species were collected from nest holes of Amami Spinous Country-rat, Tokudaia oshimensis oshimensis (Abe, 1933) and from soil under rocks. Holotype and 10 paratypes are deposited in the National Science Museum, National History Institute, Shinjuku, Tokyo, and 5 paratypes are preserved in collections of author. Doloisia (Doloisia) satoiana Suzuki, n. sp., Fig. 2 A-G Diagnosis of larva : This species somewhat resembles to D. okabei (Sasa et al. 1952) in having globose sensilla, but it is separable by a nude seta on dorsal tibial a of palpus, in D. okabei having nude seta on genual, dorsal tibiala and lateral tibiala of palpus. Average body length and width of 10 paratypes 180μm×125μm when unengorged. Palpal formula B/B/NBB+4B・N, small eyes 1+1. Galeal seta nude. Scutum shaped like triangle with round anterior margin. Sensilla globose, AL setae short and weakly barbed (Fig. 2). Scutal measurements as in Table 2. Dorsal setae total 36 to 38,arranged 4-10-8-6-6-2-2,sternal setae 2-2. Coxal setae 2-5-10 to 12. Specialized setae on legs as in Fig. 2,G. Leg I : Length of tarsus, 43μm; a long mastifemorala, 2 genualae, 1 microgenuala, 2 tibial spurs, 1 microtibiala, 1 pretarsala, 1 subterminala, 1 parasubterminala, 1 tarsal spur, 1 microtarsala. Leg II : Length of tarsus, 36μm; 1 genuala, 2 tibial spurs, 1 pretarsala, 1 tarsal spur, 1 microtarsala. Leg III : Length of tarsus, 43μm; 1 genuala. This new species were collected from soil of nest hole of Amami-hare, Pentalagus furnessi (Stone, 1900), and from soil under rocks and tree holes. Holotype and 20 paratypes are deposited in the National Science Museum, Natural History Institute, Shinjuku, Tokyo and also 20 paratypes are preserved in collections of author. Doloisia (Doloisia) zentokii Suzuki, n. sp. Fig. 3 A-G Diagnosis of larva : D. zentokii n. sp. is colsely related to D. nasicola (Domrow and Nadchatram, 1962) in having 2-2-2 sternal setae. But it is separated by the most setal number on coxa I, II, III, most dorsal setae in number and by scutal characters. This species is also related to D. okabei (Sasa et al., 1952) and D. satoiana, from which it is separated by the number of sternal setae and setal number an coxa I, II, III. Average length and width of engorged specimens (10 paratypes) 510μm×350μm. Palpal formula B/B/NNB+4B・N, very small eyes 1+1 or absent. Galeal seta nude. Scutum shaped like triangle. Sensilla glob

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