Agrophogonus hamulifer Olsen & Enghoff, 2020

Olsen, Sissel Anna, Rosenmejer, Trine & Enghoff, Henrik, 2020, A mountain of millipedes IX: Species of the family Gomphodesmidae from the Udzungwa Mountains, Tanzania (Diplopoda, Polydesmida), European Journal of Taxonomy 675, pp. 1-35 : 26-28

Agrophogonus hamulifer Olsen & Enghoff sp. nov.

urn:lsid:zoobank.org:act:646486B2-BF4F-45D9-9E74-E8FD6FC70DD5

Figs 1 , 5C , 18

Diagnosis

Resembles A. kiellandi and A. pusillokiellandi sp. nov. in having the postnodal telopodite slender, and having nodal process A spiniform, without an accessory basal process. Differs from these species in having the postnodal telopodite very long and evenly curved. Differs further from A. kiellandi by smaller body size (width 5.2–6.2 mm vs 8.7 mm in A. kiellandi ) and from A. pusillokiellandi sp. nov. (width 4.1 mm) by larger body size.

Etymology

The name is a Latin noun in apposition, meaning ‘carrying a small hook’ and refers to the resemblance of the postnodal telepodite to the curvature of a fishing hook.

Material examined

Holotype

TANZANIA • ♂; Iringa Region /district, West Kilombero Scarp FR; 07°53′19.5″ S, 36°23′11.6″ E; 1115 m a.s.l.; 25 Nov. 2000; Frontier Tanzania UMBS leg.; plot 17, Ukami, montane forest; NHMD 621678 .

Paratypes

TANZANIA • 11 ♂♂, 7 ♀♀, 29 juv.; same collecting data as for holotype; NHMD 621679 • 3 ♂♂, 2 ♀♀; same collecting data as for holotype; 1100–1130 m a.s.l.; 30 Nov. 2000; NHMD 621680 • 1 ♂, 1 juv.; same collecting data as for holotype but 07°50′38.4″ S, 36°22′17.6″ E; 1390–1410 m a.s.l.; plot Paradiso; NHMD 621681 .

Description

Males

SIZE AND SHAPE. Body length 27–31 mm. Maximum width 5.2–6.2 mm. W/L ratio 20%.

COLOUR ( Fig. 1 ). Very pale brown, darker around base of setae. Specimen stored in ethanol since 2000; thus, any pigmentation that may have been present in life is now faded.

STERNAL PROCESS ON BODY RING 6 ( Fig. 5C ). Long and slender, but broader towards basis and anterior end. Tip evenly rounded.

BODY RINGS. No transverse sternal carinae.

TELSON. Epiproct flattened at posterior end, forming a small vertical plane, with four protruding setae. Hypoproct semicircular to slightly triangular, paramedian tubercles large, extending beyond edge of sclerite. Setae on paraproct protruding from clear basal tubercles.

GONOPOD ( Fig. 18 ). Gonopod aperture suboval, extended back between second pair of legs on seventh segment, elevated in front of coxae, eliminated medially. Paracannular setae present. Nodal process L present, process M absent. Processes A and B slender and curved, process C longer than A and B. Processes B and C forcipulate in their curvature and position to each other. Postnodal telepodite very long, slender and acuminate, longer than in other members of the genus, without an abrupt flexure after nodus.

Distribution

Found at two separate locations within the same forest (Ukami) in the West Kilombero FR, Udzungwa Mts.

Figures

Fig. 1. Agrophogonus hamulifer Olsen & Enghoff sp. nov., paratype, ♂ (NHMD 621681), showing the typical gomphodesmid habitus. Scale bar: 2 mm.

Fig. 5. Sternal process on body ring 6. A. Emphysemastix spp. B. Agrophogonus spp. except A. hamulifer Olsen & Enghoff sp. nov. C. Agrophogonus hamulifer Olsen & Enghoff sp. nov. D. Pogoropsis prolixopes Rosenmejer & Enghoff gen. et sp. nov. E. Pogoro siren Rosenmejer & Enghoff sp. nov. F. Pogoro scharffi Hoffman, 2005. G. Pogoro alopias Rosenmejer & Enghoff sp. nov. Not drawn to scale.

Fig. 18. Agrophogonus hamulifer Olsen & Enghoff sp. nov., holotype, ♂ (NHMD 621678), left gonopod. A–B. Mesal view. C–D. Lateral view. E–F. Dorsal view. Abbreviations: A = Process A; B = Process B; C = Process C; L = Process L. Scale bars: 0.5 mm.