Dawydoffia Attems, 1953

Wesener, Thomas, Moritz, Leif & Akkari, Nesrine, 2023, Integrative redescription of the sucking millipede genus Dawydoffia Attems, 1953 with a description of a new species and a transfer to the family Hirudisomatidae (Diplopoda, Polyzoniida), Zootaxa 5263 (3), pp. 411-429 : 418-419

Genus Dawydoffia Attems, 1953

Attems, 1953: 196, plate 15 (description, in Hirudisomatidae )

Jeekel 1971: 38 (list)

Hoffman 1977: 430 (list, in tribe Siphonotini )

Hoffman 1980: 73 (list, in Siphonotidae , tribe Siphonotini )

Enghoff et al. 2004: 33 (list, in Siphonotidae )

Enghoff et al. 2015: 389 (list, in Siphonotidae )

Type species: Dawydoffia kalonota Attems, 1953 , by original designation.

Other species included:

Dawydoffia siphonocryptida new species ( Laos)

Diagnosis: Small (6–12 mm), wide (2.5–3.5 times longer than wide, see Figs 4B , 6 ), oval, collum covering most of head, tergites with strongly upturned posterior margins, telson only visible in ventral view, ozopores located at tergal lateral margin, similar to other genera of the Hirudisomatidae and quite different from any Siphonotidae , the only other Polyzoniida species known from south-east Asia. Head with 3+3 ommatidia like most genera of the family. Head with a longitudinal groove on epicranium between ommatidia. 32–42 tergites; antennomeres 2–6 cylindrical, of equal length, antennomere 7 recessed, almost invisible; coxal pores starting at coxa 3; pseudopenis cylindrical, located posteriorly on coxa 2. Anterior and posterior gonopods with 6 podomeres, last podomere of posterior gonopod fimbriate. Tergites and pleurites fused without any visible suture. Differs from all known genera of the family by the presence of 2 or 4 conical protuberances on male sternites 1 and 2 ( Fig. 9A ), as well as the presence of strongly widened tarsal claws at male legs 1 and 2 ( Fig. 8C ).

Figures

FIGURE 4. Dawydoffia kalonota Attems, 1953 paralectotypes (Fan Si Pan and Chapa): A. ♀, Head and anterior body rings (NHMW MY10338), lateral view. B–E ♀ from Chapa (NHMW MY10335): B. Entire specimen, ventral view; C. Mid-body section of a broken specimen from Chapa showing ozopores (NHMW MY10335). D. Closeup of the head showing ommatidia and first antennal articles. E. Posterior body rings showing anal valves by transparency, dorsal view.

FIGURE 6. Dawydoffia siphonocryptida n. sp., female paratype (SMF), volume rendering based on µCT-data.A. Habitus lateral view. B. Head and anterior body, ventral view. C. Telson and posterior body, ventral view. Abbreviations: At = Antennae; Co = collum; ep = epicranium; fh = forehead; oz = ozopore, Pl = pleurite; St = sternite; T = tergite; Te = telson; Vu = vulva.

FIGURE 8. Dawydoffia siphonocryptida n. sp., male holotype (SMF), scanning electron micrographs. A. Posterior body end, dorsal view. B. posterior body end with telson, ventral view. C. First tarsal claw. D. Leg 5, tarsal claw. E. Hirudisoma roseum (Victor, 1839), ZFMK MYR11859, midbody leg, tarsal claw. F. Midbody leg, posterior view. Abbreviations: Cx = coxa; cp = coxal pouch; Fe = femur; Go = tip of male gonopore; oz = ozopore; P = pleurite; paro = paronychium; Po = postfemur; Pre = prefemur; St = sternite; T = tergite; Ta = tarsus; Ti = tibia; tr = trochanter.

FIGURE 9. Dawydoffia siphonocryptida n. sp., male holotype (SMF), scanning electron micrographs. A. Sternite 1 and 2, coxa of leg pair 2 with gonapophysis or pseudopenis, ventral view.Arrows point to sternal protuberances. B. Left gonapophysis or pseudopenis, ventral view. C. Anterior and posterior gonopod, lateral view. D. Gonopods, anterior view. E. Anterior and posterior gonopod, posterior view. F. Detail of podomere 5, posterior gonopod. Abbreviations: aG = anterior gonopod; aG-P = process on anterior gonopod; cp = coxal pouch; Cx = coxa; H = head; LP –= lateral process of podomere 6 of anterior gonopod; MP = mesal process of podomere 6 of anterior gonopod; pG = posterior gonopod; PP = pseudopenis; St = sternite; St-p = sternite process.