Ingrassia micronota, Stefan, Laura M., Gómez-Díaz, Elena & Mironov, Sergey, 2013

Stefan, Laura M., Gómez-Díaz, Elena & Mironov, Sergey, 2013, Three new species of the feather mite subfamily Ingrassiinae (Acariformes: Xolalgidae) from shearwaters and petrels (Procellariiformes: Procellariidae), Zootaxa 3682 (1), pp. 105-120 : 110-114

Ingrassia micronota sp. n.

( Figs. 4–6 )

Type material. Holotype male ( ZISP 5042), 5 male and 5 female paratypes ( ZISP 5043, 5044) from B. bulwerii (Jardine and Selby) (Procellariidae) , CAPE VERDE, Cape Verde Archipelago, Raso Island, 5 July 2006, col. J. González-Solís and E. Gómez-Díaz.

Additional material. 4 males and 2 females ( ZISP 5045) from B. bulwerii , CAPE VERDE, Cape Verde Archipelago, Ilhéu Grande Island, 30 June 2009; 2 females ( ZISP 5046) from same host and same locality, 28 June 2009; 4 males and 2 females ( ZISP 5047, 5048) from same host, CAPE VERDE, Cape Verde Archipelago, Ilhéu de Cima Island, 24 February 2012; 2 males and 2 females ( ZISP 5049–5051) from B. bulwerii , same location, 26 February 2012; collector in all cases J. González-Solís.

Description. MALE (holotype, range for 5 paratypes in parentheses): Length of idiosoma from anterior end to bases of setae h3 290 (265–280), greatest width 185 (175–185), length of hysterosoma 160 (140–155). Prodorsal shield: narrow longitudinal plate with slightly attenuate anterior and posterior ends, anterior half with longitudinal membranous crest, length 80 (73–83), greatest width 13 (13–15), posterior end extending slightly beyond level of scapular setae se, si ( Fig. 4 A). Setae se separated by 58 (50–63), situated on small circular plates. Scapular shields wide, inner margin rough, without suprategumental extension. Hysteronotal shield: anterior margin with three blunt-angular extensions, length of shield from anterior margin to bases of setae h3 178 (155–168). Setae c2 approximately half as long as macrosetae cp; setae d2 about 2/3rd the length of setae cp, extending approximately to level of setae h3. Supranal concavity ovate almost closed posteriorly. Length of terminal cleft from anterior end of supranal concavity to base of setae h3 88 (75–85), greatest width of terminal cleft 33 (25–33). Terminal membranous extensions on lobar apices tongue-like, with longitudinal striae, length from base of setae h3 to apices 33 (25–35), width at base 23 (20–23), length of incision between terminal extensions 28 (20–30). Setae ps1 situated approximately at level of setae h2. Distance between dorsal setae: c2: c2 100 (100), c2: d2 28 (20–25), d2: e2 55 (48–55), e2: h3 75 (63–73), h3: h3 40 (33–35), ps1: ps1 25 (23).

Sternum about ½ of total length of epimerites I. Inner ends of epimerites IIIa free, widely separated from each other ( Fig. 4 B). Setae 4b situated on ends of epimerites IIIa and extending slightly beyond lobar apices. A pair of small sclerites (apparently derivatives of epimerites III) situated just above setae 3a ( Fig. 4 B). Adanal shields absent. Pregenital apodeme small, slightly curved. Genital apparatus small, genital arch ring-shaped, 12 (10–13) long, 11 (10–12) wide. Anal shields present, situated between setae ps3 and anal suckers. Epimerites IVa not developed. Coxal fields IV not sclerotized. Diameter of anal suckers 15 (13–15). Distance between ventral setae: 4b:4b 35 (33–35), 4b:3a 13 (10–13), 4b:g 48 (38–43), g:ps3 25 (20–23), ps3:h3 25 (20–25).

Tarsi I, II each with well-expressed apico-dorsal extension. Tibia I with acute ventral process, tibia II with rounded ventral process ( Figs. 6 A, B). Tibia III without apical spine, solenidion φ situated on rounded distal end of this segment; tarsus III narrow, without crest on lateral margin, with small finger-like apical extension, length of tarsus III 78 (68–75) ( Fig. 6 C). Tarsus IV with finger-like apical extension bearing setae d, e ( Fig. 6 D). Legs IV excluding pretarsus 125 (120–125) long; articulation of genu and tibia approximately at level of setae f2; tarsus IV extending by distal half beyond the level of terminal membrane apices.

FEMALE (range for 5 paratypes): Length of idiosoma 285–305, greatest width 165–210, length of hysterosoma 150–200. Prodorsal shield: narrow longitudinal plate with strongly attenuated posterior end and bifurcated anterior end; longitudinal membranous crest present in the anterior part of this shield; posterior end of shield extending slightly beyond level of setae se; length 80–88, greatest width 10–13 ( Fig. 5 A). Scapular setae si and se situated on finely striated tegument, setae si situated noticeably anterior to level of setae se. Setae se separated by 58–88. Scapular shields narrow, inner margin of them smooth, slightly convex. Humeral shields small without antero-mesal extension. Setae c3 longer than total length of trochanter, femur and genu III. Hysteronotal shield: very small longitudinal plate, teardrop-shaped, with acute anterior end and bearing setae d1 and e1; length along midline 38–43, greatest width 23–30. Setae c2, d2, and e2 situated on striated tegument. Setae c2 and d2 subequal in length to humeral setae cp. Setae d2 strongly moved to midline, situated at level of anterior end of hysteronotal shield, tips of these setae extending beyond posterior end of opisthosoma. Setae e2 extending slightly beyond posterior end of opisthosoma. Distance between dorsal setae c2: d2 48–63, d2: e2 58 –65, e2: h3 53–63, h3: h 3 20–30.

Sternum shorter than half total length of epimerites I. Epigynum thin, slightly curved transverse sclerite, 5–8 long, 25–30 wide, with tips touching to bases of setae 4b. Apodemes of oviporus long, posterior ends narrowed and rounded, extending to midlevel of epimerites IIIa. Setae g, 3a, 4a, 4 b long, exceeding lengths of femoragenu III, IV. Setae g, 3a, and 4b extending to or beyond level of seta 4a bases; setae 4a extending beyond posterior end of opisthosoma. Setae h3 approximately half as long as setae h2.

Legs I, II as in the male. Distal half of tibia IV and tarsus IV extending beyond posterior end of opisthosoma. Tarsi III, IV with pair of short dorso-apical spines; length of tarsi III and IV 68 –70 and 70–78, respectively ( Figs. 6 E, F). Setae sR III subequal to total length of corresponding femur, genu and tibia. Seta w of tarsus III and setae r, w of tarsus IV noticeably thickened in basal part.

Differential diagnosis. As for the species described above, I. micronota sp. n. is also most similar to I. dubinini Černý, 1967 by the structures of the prodorsal shield in both sexes. Ingrassia micronota differs from I. dubinini by the following characters: in both sexes, the dorsal crest of the prodorsal shield is approximately half as long as the shield; in males, the bases of setae se are situated on small circular plates, setae d2 are long and almost extend to the lobar apices; in females, the hysteronotal shield is represented by a small teardrop-shaped sclerite (38–43 long) in the middle of the hysterosoma and encompasses only bases of setae d1, e1. In both sexes of I. dubinini , the dorsal crest of the prodorsal shield is no longer than one third the length of the shield; in males, the bases of setae se as well as setae si are situated on striated tegument, setae d2 are short and do not extend to bases of setae e2; in females, the hysteronotal shield is represented by a longitudinal plate (70–80 long) with the acute posterior end and encompasses only bases of setae d1, e1 and d2.

Etymology. The specific epithet refers to a very small hysteronotal shield in females.

Figures

FIGURE 4. Ingrassia micronota sp. n. male. A—dorsal view, B—ventral view.

FIGURE 5. Ingrassia micronota sp. n., female. A—dorsal view, B—ventral view.

FIGURE 6. Ingrassia micronota sp. n., details of legs. A – D—male, E – F—female. A—tarsus and tibia I, dorsal view, Btarsus and tibia II, dorsal view, C—tarsus III, dorsal view, D—tarsus and tibia IV, dorsal view, E—tarsus III, dorsal view, Ftarsus IV, dorsal view.