Craspedorrhynchus guizhouensis, Gustafsson & Tian & Ren & Li & Sun & Zou, 2024

Gustafsson, Daniel R., Tian, Chunpo, Ren, Mengjiao, Li, Zhu, Sun, Xiuling & Zou, Fasheng, 2024, Two new species of Craspedorrhynchus Kéler, 1938, (Phthiraptera: Ischnocera: Philopteridae) from Chinese birds of prey (Accipitriformes), Journal of Natural History 58 (13 - 16), pp. 491-510 : 493-498

Craspedorrhynchus guizhouensis sp. n.

( Figures 1–6 )

Type host

Accipiter soloensis (Horsfield, 1821) – Chinese sparrowhawk.

Type locality

Guizhou Province, China.

Diagnosis. Craspedorrhynchus guizhouensis sp. n. keys to couplet 6 in the incomplete key of Perez and Martin-Mateo (1995), but the lateral margins of the dorsal anterior plate are rounded and the posterior part is long in C. guizhouensis , meaning that neither choice in this couplet is suitable. Judging from the illustrations of Gállego et al. (1987), the shape of the dorsal anterior plate appears to be an inadequate key character, as there is much variation between species. Following the first choice in couplet 6, C. guizhouensis keys to Craspedorrhynchus triangularis ( Rudow, 1869) , whereas if the second choice is followed and further characters of the dorsal anterior plate are ignored, C. guizhouensis keys to Craspedorrhynchus subbuteonis Gállego et al., 1987 . The type material of C. triangularis is lost ( Clay and Hopkins 1955; Mey 2001), and more material is necessary to fully compare C. guizhouensis with C. triangularis .

Craspedorrhynchus guizhouensis can be separated from C. triangularis by the following combination of characters: preantennal area longer than postantennal area, with frons clearly concave in C. guizhouensis ( Figure 3 ), but preantennal area at most as long as postantennal area and frons rounded in C. triangularis ; lateral accessory sternal plates absent in male C. guizhouensis ( Figure 1 ), but present on segments VI–VII in C. triangularis ; dorsal anterior plate proportionately much longer, particularly in the posterior end, in C. guizhouensis ( Figure 3 ) than in C. triangularis ; dorsal side of proximal mesosome with nearly parallel, rounded antero-lateral lobes in C. triangularis , but with distally narrowed, anteriorly divergent lobes in C. guizhouensis ( Figure 4 ); mesosomal lobes with more or less flat distal margins in C. guizhouensis ( Figure 5 ), but with convex posterior margin in C. triangularis ; parameres of different shape, with overall axis (from central base to central tip) more parallel in C. guizhouensis ( Figure 4 ) than in C. triangularis ; female vulval chaetotaxy not detailed by Gállego et al. (1987), but appears to be similar in the two species; however, the shape of the subgenital and subvulval plates differ between the two species ( Figure 6 ), as does the head shape ( Figure 2 ).

Craspedorrhynchus guizhouensis can be separated from C. subbuteonis by the following combination of characters: dorsal anterior plate with irregularly rounded lateral margins in C. guizhouensis ( Figure 1 ; less obvious in some specimens, as in the illustrated female, Figure 2 ), but with parallel lateral margins in C. subbuteonis ; male subgenital plate with 4–5 macrosetae on each side in distal end in C. subbuteonis , but with only 3 macrosetae on each side in C. guizhouensis ( Figure 1 ); principal post-spiracular setae absent on male tergopleurites II–III and female tergopleurite II in C. guizhouensis ( Figures 1–2 ), but present on these segments in C. subbuteonis ; the description of the male tergal chaetotaxy of C. subbuteonis by Perez and Martin-Mateo (1995) is not straightforward, but seems to indicate that this species has more setae than in C. guizhouensis on each side of at least tergopleurite II, and that C. subbuteonis lacks the set of very short setae median to tergopleurites VII–VIII found in C. guizhouensis ( Figure 1 ); the description of the female tergal chaetotaxy by Perez and Martin-Mateo (1995) suffers the same problem, but whereas in C. guizhouensis there are a maximum of 7 tergal setae on each side of tergopleurite II ( Figure 2 ), there are at least 8 on each side in C. subbuteonis ; male parameres shorter and more strongly curved in C. subbuteonis than in C. guizhouensis ( Figure 4 ); female vulval chaetotaxy appears to overlap, but shape of subgenital and subvulval plates set the species apart ( Figure 6 ).

Description. Head rounded trapezoidal, preantennal head longer than postantennal head ( Figure 3 ); frons concave. Dorsal anterior plate with almost flat anterior margin, irregularly rounded lateral margins (less obvious in female), and elongated posterior part. Head chaetotaxy as in Figure 3 ; postnodal seta present. Eye somewhat triangular, but not much extended distally. Thoracic and abdominal segments and chaetotaxy as in Figures 1–2 . Lateral accessory sternal plates absent in male, but present on abdominal segments V–VIII in female. Male dorsal abdominal chaetotaxy: principal post-spiracular setae present on tergopleurites IV–VII; tergopleurites II–IV with 4–5 more or less equally long macrosetae on each side; tergopleurites V–VI with 4–5 mesosetae on each side, the most median and most lateral of which are clearly longer than those in between; tergopleurites VII–VIII with 3 median mesosetae and 1 more lateral meso- or macroseta on each side. Female dorsal abdominal chaetotaxy: principal post-spiracular setae present on tergopleurites III–VII; tergopleurites II–III with 6–7 more or less equally long macrosetae on each side; tergopleurites IV–VI with 3–4 more or less equally long macrosetae on each side, the median of which are separated from the lateral ones by a gap; tergopleurites VII–VIII with 4–6 more or less equally long macrosetae on each side. Male subgenital plate with antero-lateral corners fragmented into small plates; chaetotaxy: 1 macroseta on each side anterior to plate, 1 lateral macroseta on each side in anterior end, 3 lateral macrosetae on each side in posterior end. Basal apodeme as in Figures 4–5 , with median thickening. Dorsal plates of mesosome elongated, fused proximally. Ventral mesosomal plates slender, seemingly articulating with parameral heads. Mesosomal lobes with more or less flat distal margins. Gonopore broad, proximally associated with slender curved structures. Parameres long, curved. Female subgenital plates roughly rectangular, with irregular median margins and small distal area of irregular, fragmented sclerotizations ( Figure 6 ). Vulval margin more or less flat, with 7–8 long, slender vms, 6–7 slender and 3–6 thorn-like vss, 9–10 microsetal and (in anterior end) 5–6 slender vos on each side. Subvulval plates broadly rectangular with postero-median section slightly extended, and with 9 mesosetae in tufts on each side. Measurements as in Table 1 .

Etymology

The specific name is derived from the type locality.

Specimens examined

Holotype ♂, Guizhou [ China], 22 January 1958, no collector, box E0026008, slide 40 ( BNHM) [marked with black dot on slide] . Paratypes: 8♂, 11♀, same data as holotype, box E0026008, slides 40–42 ( BNHM) . Non-types: 3 nymphs, same data as holotype, box E0026008, slide 40 ( BNHM) .

Figures

Figure 1. Craspedorrhynchus guizhouensis new species, male habitus, dorsal and ventral views.

Figure 2. Craspedorrhynchus guizhouensis new species, female habitus, dorsal and ventral views.

Figure 3-6. Craspedorrhynchus guizhouensis new species. 3, male head, dorsal and ventral views. 4, male genitalia, dorsal view. 5, male genitalia, ventral view. 6, female subgenital plates, vulval margin, and post-vulval area, ventral view.