Ingrassia calonectris, 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 : 107-109

Ingrassia calonectris sp. n.

( Figs. 1–3 )

Type material. Male holotype ( ZISP 5032), 1 male paratype from C. borealis Cory ( Procellariidae ), PORTUGAL, Azores Archipelago, 9 June 2003, col. J. González-Solís and E. Gómez-Díaz; 1 female paratype ( ZISP 5033), same host and location, 16 August 2003, col. J. González-Solís and E. Gómez-Díaz.

Additional material. 1 male ( ZISP 5034) from C. borealis, PORTUGAL, Madeira Archipelago, Desertas Island, 19 September 2005, col. E. Gómez-Díaz; 1 male ( ZISP 5035) from same host and same locality, 21 September 2005, col. J. González-Solís; 3 males and 1 female ( ZISP 5036) from C. edwardsii, CAPE VERDE, Cape Verde Archipelago, Boa Vista, Curral Velho Islet, 9 July 2007, col. J. González-Solís; 2 males and 2 females ( ZISP 5037) from same host and same locality, 12 July 2006, col. J. González-Solís; 2 males and 1 female ( ZISP 5038) from same host, CAPE VERDE, Cape Verde Archipelago, Raso Island, 7 June 2008, col. P. Rodrigues; 5 males and 4 females ( ZISP 5039–5041) from same host and same locality, 8 March 2007, col. J. González-Solís.

Description. MALE (holotype, measurements for paratype in parentheses): length of idiosoma from anterior end to bases of setae h3 290 (290), greatest width 195 (205), length of hysterosoma 155 (155). Prodorsal shield: narrow longitudinal plate with strongly attenuate anterior and posterior ends, membranous longitudinal crest present in the anterior one third of this shield, length 80 (75), greatest width 20 (20), posterior end strongly extending beyond level of scapular setae se ( Fig. 1 A). Setae se separated by 73 (68) situated on finely striated tegument, setae si slightly anterior to level of setae se. Scapular shields wide, inner margin convex, smooth, without suprategumental extension. Hysteronotal shield: anterior margin roughly sinuous, length of shield from anterior end to bases of setae h3 175 (173). Setae c2 and d2 filiform, 20–30 long, much shorter than humeral macrosetae cp. Supranal concavity ovate, open posteriorly into terminal cleft. Length of terminal cleft from anterior end of concavity to base of setae h3 83 (85), greatest width of terminal cleft 45 (50). Terminal membranous extensions on lobar apices tongue-like, with longitudinal striae, length from base of setae h3 to apices of terminal extensions 33 (33), width at base 23 (20), length of incision between extensions 30 (30). Setae ps1 situated approximately at level of setae h2. Distance between dorsal setae: c2: c2 123 (123), c2: d2 33 (35), d2: e2 50 (50), e2: h3 70 (75), h3: h3 38 (40), ps1: ps1 28 (28).

Sternum about 2/3 of total length of epimerites I. Inner ends of epimerites IIIa free, widely separated from each other ( Fig. 1 B). Setae 4b situated on ends of epimerites IIIa and extending to level of lobar apices. Pregenital apodeme (epiandrium) bow-shaped, 8 (9) long, 28 (27) wide. Genital apparatus small, 9 (10) × 20 (21). Adanal shields present, represented by small L-shaped sclerites between levels of setae g and ps3. Anal shields small, represented by minute transverse sclerites between setae ps3 and anal suckers. Epimerites IVa present, long, almost completely enclosing coxal fields IV. Central part of coxal fields IV not sclerotized. Diameter of anal suckers 18 (20). Distance between ventral setae: 4b:4b 40 (38), 4b:3a 23 (25), 4b:g 38 (38), g:ps3 23 (25), ps3:h3 25 (25).

Tarsi I, II each with a well-expressed apico-dorsal extension. Tibia I and II with spine-shaped ventral processes ( Figs. 3 A, B). Tibia III with flat spine-like extension at base of solenidion φ; tarsus III widened at base, with crest a long lateral margin and with small finger-like apical extension, length of tarsus III 65 (73) ( Fig. 3 C). Tarsus IV with finger-like apical extension bearing setae d, e ( Fig. 3 D). Legs IV excluding pretarsus 123 (123) long, articulation of genu and tibia at level of setae h2; tarsus IV extending by distal half beyond level of terminal membranous extensions.

FEMALE (paratype): Length of idiosoma 305, greatest width 175, length of hysterosoma 180. Prodorsal shield: narrow longitudinal plate with slightly attenuated ends; anterior end bifurcated with short longitudinal crest (about 1/5 of total length of the shield); posterior end with small incision or straight and extending to midlevel between scapular setae and c2; length 90, greatest width 20 ( Fig. 2 A). Scapular setae si and se situated on finely striated tegument. Setae se separated by 75, setae si slightly anterior to level of se. Scapular shields with smooth inner margin. Humeral shields well-developed without antero-mesal extensions. Setae c3 short, subequal to total length of femur and genu III. Hysteronotal shield: a longitudinal plate occupying median part of hysterosoma; anterior end with median extension, lateral margins unevenly sinuous, posterior part noticeably narrowed and truncate, extending slightly beyond level of setae e2; length 125, greatest width 38. Setae c2, d2, and e2 filiform, about 20 long, noticeably shorter than trochanters III. Setae d1, d2, and e1 situated on lateral margins of hysteronotal shield, setae c2, e2 situated on striated tegument. Distance between dorsal setae: c2: d2 58, d2: e2 65, e2: h3 55, h3: h3 28.

Sternum slightly shorter than half the -length of epimerites I. Epigynum thick, bow-shaped, 13 long, 35 wide, tips bearing bases of setae 4b. Apodemes of oviporus long, posterior ends narrowed and rounded, extending to midlevel of epimerites IVa ( Fig. 2 B). Setae 4b long, almost extending to posterior tips of oviporus apodemes, setae g, 3a, 4a short, not exceeding the length of femoragenu III, IV. Setae h3 approximately half as long as setae h2.

Legs I, II as in the male. Tarsus IV extending beyond posterior end of opisthosoma. Tarsi III, IV without apical spines, length of tarsi III and IV 50 and 58, respectively ( Figs. 3 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. The new species Ingrassia calonectris sp. n. is most similar to I. dubinini Černý, 1967 by having in both sexes the prodorsal shield relatively narrow (much less than half the distance between scapular setae se) with strongly attenuate posterior end, and by the presence of the membranous median crest on the anterior part of this shield. Ingrassia calonectris differs from that species by the following features: in males, the middle part of the prodorsal shield has distinctly convex lateral margins, the anterior margin of the hysteronotal shield is roughly sinuous, and tarsi III have an angular apicodorsal extension at the base of solenidion φ; in females, the posterior end of the prodorsal shield is truncate or bidentate, the posterior end of the hysteronotal shield is truncate and extends beyond the level of setae e2. In males of I. dubinini , the prodorsal shield does not have lateral convex extensions, the anterior margin of the hysteronotal shield is slightly convex, and the apices of tarsi III lack an extension at the base of solenidion φ; in females, the prodorsal shield has an acute posterior end, and the posterior end of the hysteronotal shield is angular and does not extend to the level of setae e2.

Etymology. The specific epithet is taken from the generic name of the type host.

Figures

FIGURE 1. Ingrassia calonectris sp. n., male. A—dorsal view, B—ventral view.

FIGURE 2. Ingrassia calonectris sp. n., female. A—dorsal view, B—ventral view.

FIGURE 3. Ingrassia calonectris 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.