Xystonotus madagascariensis Pešić, Cook & Gerecke, 2013

Pešić, Vladimir, Cook, David, Gerecke, Reinhard & Smit, Harry, 2013, The water mite family Mideopsidae (Acari: Hydrachnidia): a contribution to the diversity in the Afrotropical region and taxonomic changes above species level, Zootaxa 3720 (1), pp. 1-75 : 69-75

publication ID

https://doi.org/ 10.11646/zootaxa.3720.1.1

publication LSID

lsid:zoobank.org:pub:E4F362CE-0F00-4C1D-9DF6-139F824815C9

DOI

https://doi.org/10.5281/zenodo.6149231

persistent identifier

https://treatment.plazi.org/id/03F82941-AD09-FFBC-44EE-F95FEDE1DE11

treatment provided by

Plazi

scientific name

Xystonotus madagascariensis Pešić, Cook & Gerecke
status

sp. nov.

Xystonotus madagascariensis Pešić, Cook & Gerecke sp. nov.

( Figs. 41G–H View FIGURE 41 A – H , 44A–F View FIGURE 44 A – F )

Type series: Holotype female, dissected and slide mounted, Madagascar 109, Ankaratra (Antananarivo), Reserve Manjakatompo, riparian spring exp. SE, at spring stream N deviation to Analamitana (MD108), 1850 m asl., 14.3˚C, 0.003 mS/cm, 08.x.2001, Gerecke & Goldschmidt. Paratype: same locality and data as holotype, 0/1/0 (dissected and slide mounted).

Diagnosis (based on female; male unknown). Dorsal shield with V-shaped area of smaller pores only slightly raised laterally, reaching frontal and caudal margin of dorsal shield, more distanced to each other in their middle part, leaving a broader medial, and narrower lateral areas ( Figs. 41 View FIGURE 41 A – H G-H); gnathosomal bay a rounded V-shaped; medial margin of Cx-IV reduced to a median angle; genital bay of moderate depth, embracing approximately onehalf of the genital field ( Fig. 44E View FIGURE 44 A – F ); genital field noticeably wider than long (L/W ratio 0.9); Cxgl-2 located anterior to gonopore; ventral tubercle of P-4 truncate.

Description

Female (holotype, in parentheses measurements of paratype): Idiosoma (ventral view: Fig. 44B View FIGURE 44 A – F ) L/W 434 (475)/378 (394). Dorsal shield ( Fig. 41 View FIGURE 41 A – H G-H) L/W 398 (428)/341 (347), ratio 1.17 (1.23); gnathosomal bay L 65 (65); gonopore L/W 83 (86)/94 (92), ratio 0.9 (0.9); egg maximum diameter (127). Palp ( Fig. 44C View FIGURE 44 A – F ): total L 165-167 (163); L/H, L/H ratio: P-1, 20/25, 0.8 (20/25, 0.8); P-2, 39/40, 0.98 (37/40, 0.93); P-3, 35/31, 1.12 (32/32, 1.0); P- 4, 52-53/28-29, 1.9 (55/28, 2.0); P-5, 19-20/10, 2.0 (19/9, 2.1); chelicera total L 92 (89); gnathosoma vL 82 (80). Legs: dL of I-L: 60 (59), 59 (59), 45 (48), 50 (51), 63 (65), 77 (74); I-L-6 H 36 (33), I-L-6 dL/H ratio 2.1 (2.2); dL of IV-L: 69 (72), 60 (71), 59)63), 79 (83), 99 (103), 92 (105).

Male: Unknown.

Etymology: Named after the country of the type locality.

Discussion: Due to the shape of the posteromedial suture lines of Cx-IV which extend abruptly posteriorly and closely flank the genital field, the new species is assigned to the subgenus Mixomideopsis which also includes Xystonotus (Mixomideopsis) sandola (Cook) from South Africa. The later species is unique within the genus Xystonotus in that the legs bear a few swimming setae (numbers: III-L-3/4 and IV-L-4, 1, III/IV-L-5, 2), Cxgl-2 being located close to anterolateral margin of genital field, and P-4 very slender with a proximally placed ventral tubercle.

Distribution: Madagascar; only known from the type locality in the Ankaratra mountains.

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