Diamphidaxona
Creators: name: Smith, Ian M.
name: Cook, David R.
Publisher: name: Zenodo
Year: 2006
Subjects: Biodiversity
Taxonomy
Animalia
Arthropoda
Arachnida
Trombidiformes
Hygrobatidae
Diamphidaxona

description: Key for adults of north american species of Diamphidaxona
1a. Gnathosoma with rostrum short and not extending beyond insertion of pedipalps (Figs. 7, arrow, 22, 53); pedipalps with segments relatively long and slender (Figs. 5, 20, 51) ............................................................ Diamphidaxona (s. s.) 2
1b. Gnathosoma with rostrum long and extending well beyond insertion of pedipalps (Figs. 68, arrow, 72, 78, 84, 94) and pedipalps with segments relatively short and stocky (Figs. 66, 71, 77, 83, 91) ............................................................ ............................................................. Diamphidaxona (Diamphidaxonella) 10
2a (1a). Suture lines between third and fourth coxal plates with lateral loops drop­shaped and closed anteriorly (Figs. 3, 6)......................................... D. cramerae sp. nov.
2b. Suture lines between third and fourth coxal plates with lateral loops U­shaped
and open anteriorly (Figs. 10, 15) ....................................................................... 3 3a (2a). Dorsal portion of camerostome strongly acutely angled and projecting beyond anterior end of idiosoma (Figs. 10, 15; arrows) .................... D. imamurai Cook
3b. Dorsal portion of camerostome weakly acutely angled or rounded and not extending beyond anterior end of idiosoma (Figs. 18, 21, 56, 59)...................... 4
4a (3b). Ventral shield with projections covering insertions of fourth pair of legs relatively short and extending laterally to edges of shield (Figs. 18, 21) ................... ........................................................................................... D. chihuahua sp. nov.,
4b. Ventral shield with projections covering insertions of fourth pair of legs relatively long and extending anteriorly parallel to edges of shield (Figs. 25, 28, 56, 59)........................................................................................................................ 5
5a (4b). Pedipalps with ventral spine­like setae on tarsus lacking denticles (Fig. 27) ....... ............................................................................................ D. dolichosoma Cook
5b. Pedipalps with ventral spine­like setae on tarsus bearing ventral denticles (Figs. 32, 39, 51, 57) .................................................................................................... 6
6a (5b). Pedipalps with tarsus relatively short and stocky, with ventral spine­like seta extending only slightly beyond end of segment and bearing two relatively large and strongly recurved ventral denticles (Fig. 32, arrow)....................................... ......................................................................................... D. sabinalensis sp. nov.
6b. Pedipalps with tarsus relatively much longer and more slender, with ventral spine­like seta extending well beyond end of segment and bearing relatively small, straight or slightly curved ventral denticles (Figs. 39, 51, 57) ................. 7
7a (6b). Suture lines between third and fourth coxal plates with medial loops bearing glands of fourth coxal plates relatively shallow (Figs. 37, 40, 43) ................... 8
7b. Suture lines between third and fourth coxal plates with medial loops bearing glands of fourth coxal plates relatively deeply arched (Figs. 49, 52, 56, 59) ..... 9
8a (7a). Idiosoma and appendages relatively large in size (ventral shield of female more than 490 μm in length); posterior dorsal plate slightly narrowed near midlength (Fig. 35); leg segments relatively long and slender (Figs. 36, 38) ........................ ........................................................................................... D. chiricahua sp. nov.
8b. Idiosoma and appendages relatively small in size (ventral shield of female less than 450 μm in length); posterior dorsal plate slightly widened near midlength (Fig. 42); leg segments relatively short and stocky (Figs. 45, 46) ........................ ..................................................................................... D. cavecreekensis sp. nov.
9a (7b). Dorsal shield relatively long and slender (Fig. 47); male with genital acetabula relatively small and first pair widely separated from second and third pairs (Fig. 49) ................................................................................ D. parvacetabula sp. nov.
9b. Dorsal shield relatively short and wide (Fig. 54); male with genital acetabula relatively large and first pair closer to second and third pairs (Fig. 56) ................... ..................................................................................................... D. pallida Cook
10a (1b). Pedipalps with segments very short and stocky and tibia bearing 2 ventral setae (Fig. 66) ......................................................................... D. neomexicana sp. nov.
10b. Pedipalps with segments relatively long and slender and tibia bearing 1 ventral seta (Figs. 71, 77, 83, 91) ................................................................................. 11
11a (10b). Fourth pair of legs with tarsi short and stocky (Fig. 74) ..................................... ............................................................................................ D. brevitarsa sp. nov.
11b. Fourth pair of legs with tarsi relatively long (Figs. 80, 86, 88)......................... 12
12a (11b). Dorsal shield relatively wide and with maximum width in anterior region of anterior plate (Fig. 75) ........................................................ D. platysoma sp. nov.
12b. Dorsal shield relatively narrow and with same width throughout or maximum width in posterior region of posterior plate (Figs. 81, 87) ................................ 13
13a (12b). Dorsal shield with anterior plate relatively long and strongly pointed anteriorly (Fig. 81) ............................................................................ D. californica sp. nov.
13b. Dorsal shield with anterior plate relatively short and weakly pointed anteriorly (Fig. 87) ............................................................................... D. arizonica sp. nov.
description: Published as part of Smith, Ian M. & Cook, David R., 2006, North American species of Diamphidaxona (Acari: Hydrachnida: Hygrobatidae), pp. 1-44 in Zootaxa 1279 on pages 23-25, DOI: 10.5281/zenodo.173379