Enghoffiella insolita

Antić, Dragan Ž. & Makarov, Slobodan E., 2016, The Caucasus as a major hotspot of biodiversity: Evidence from the millipede family Anthroleucosomatidae (Diplopoda, Chordeumatida), Zootaxa 4211 (1), pp. 1-205 : 113-116

Enghoffiella insolita gen. et sp. nov.

Figs 92–94

Diagnosis. As for the genus.

Etymology. An adjective; to emphasize the unusual anterior gonopods.

Material studied (total: 1 male, 3 females, 22 juveniles). Holotype. RUSSIA: male, Chechnya, Argun Valley , 5 km N of Sovetskoye, Corylus , Fagus , Carpinus , etc. forest, 750 m asl, litter, under stones and bark, 18 Jul. 1986, S. Golovatch leg. ( ZMUM ρ3342).

Paratypes (total: 3 females, 22 juveniles). All from RUSSIA, Chechnya, Argun Valley , 5 km N of Sovetskoye: 3 females, 22 juveniles, same data as holotype ( ZMUM ρ3349).

Type locality. RUSSIA: Chechnya, Argun Valley .

Description. Body with 31 segments (including telson) in adults.

MEASUREMENTS. Holotype male 10 mm long, vertical diameter of the largest pleurotergite 0.8 mm. Females 10–11 mm long, vertical diameter of the largest pleurotergite 0.9–1 mm.

COLORATION ( Fig. 92 ). Prozonites greyish, metazonites pale brown. Head and first few segments darker.

HEAD. Flattened in male. Labrum with three medial teeth and 5+5 labral and 2+2 supralabral setae. Promentum triangular, without setae. Lingual plates with 5+5 setae, on each plate arranged in two rows. Stipites with ca 20+20 setae. Antennae 1.3 mm long in holotype. Length of antennomeres (in mm): I (0.09), II (0.15), III (0.33), IV (0.17), V (0.3), VI (0.13), VII (0.11) and VIII (0.02). Length/breadth ratios of antennomeres I–VII: I (1), II (1.4), III (3.6), IV (2), V (2.7), VI (1.2) and VII (1.2). Antennomeres II, IV, V, VI and VII with one, three, one, four and one sensillum, respectively. Number of ocelli 15–18, arranged in 4 rows in holotype; 17–20 in 5 rows in females.

COLLUM. Narrower than head, with six macrochaetae. Anterior edge semi-circular, posterior margin gently concave.

BODY SEGMENTS ( Fig. 92 ). Lateral keels not developed; only barely visible lateral swellings present. Macrochaetae short and trichoid. CIX (pleurotergite 15) ~ 0.8; MIX (pleurotergite 15) ~ 2; PIX (pleurotergite 15) ~ 0.1; MA (pleurotergite 15) ~ 145˚.

TELSON. Epiproct with a pair of spinnerets and 3+3 setae (1+1 paramedian, 2+2 marginal). Hypoproct with 1+1 apical setae. Paraprocts with 3+3 marginal setae.

WALKING LEGS. In both sexes, leg-pairs 1 and 2 with tarsal combs; prefemora with several long and robust setae; femora and postfemora with a group of several long and robust setae.

MALE SEXUAL CHARACTERS ( Fig. 93 ). Leg-pairs 3–7 somewhat enlarged. Leg-pairs 3 and 4 each with a basal external protrusion on prefemur. Leg-pair 5 with a basal, oral, subtriangular protrusion on prefemur. Leg-pair 6 without peculiarities. Leg-pair 7 with a posterior, wide, squarish protrusion on coxae. Leg-pair 10 with coxal glands and coxal rounded protrusion. Leg-pair 11 with coxal glands, without other peculiarities.

ANTERIOR GONOPODS ( Fig. 94 A–C). Unusual. Barely visible, very thin, somewhat membranous and low anterior sternal lamella (sl) present. Coxal processes (cp) divided distally. Anteriorly, with four pairs of long and slender processes (p1, p2, p3 and p4). Three pairs of these processes acuminate and bare, while one pair (p3) characterized by an extended and hairy apex. The lateralmost acuminate process (p4) connected to base of anterior gonopods by a lamella (l). Posteromedial part (pmp) of coxites wing-like, highly hairy, with mesal edges folded inside. Posterior side of anterior gonopods with a pair of hairy levers (hl).

POSTERIOR GONOPODS ( Fig. 94 D, E). Coxites (c) divided. Telopodites (t) present on posterolateral side, without setae (only one telopodite with a short seta on a small knob). Coxal processes (cp) orientated posteriorly, consisting of an anterior part (ap) connected laterally to a posterior, spoon-shaped structure (pp) by lamella (l). Mesally, coxal vesicle (cv) present.

Figures

FIGURE 92. Enghoffiella insolita gen. et sp. nov., paratype female habitus. Scale line = 1 mm.

FIGURE 93. Enghoffiella insolita gen. et sp. nov., holotype male. A. Leg 3. B. Leg 4. C. Leg 5. D. Leg 7. E. Leg 10. Scale lines = 0.2 mm.

FIGURE 94. Enghoffiella insolita gen. et sp. nov., holotype male gonopods. A. Anterior gonopods, anterior view. B. Anterior gonopods, posterior view. C. Anterior gonopods, lateral view. D. Posterior gonopods, lateral view. E. Posterior gonopods, posterior view. c = coxite; l = lamella; p 1, p 2, p 3 and p 4 = processes on anterior gonopods; t = telopodite; ap = anterior part of posterior gonopods; cp = coxal process; cv = coxal vesicle; hl = hairy lever; pp = posterior part of posterior gonopods; sl = sternal lamella; pmp = posteromedial part. Scale line = 0.3 mm.