Amplaria fontinalis, Shear, 2021

Shear, William A., 2021, The millipede family Striariidae Bollman, 1893. II. New records and species of the genus Amplaria Chamberlin, 1941 (Diplopoda, Chordeumatida, Striarioidea), Zootaxa 4908 (2), pp. 205-224 : 209-212

Amplaria fontinalis , new species

Figs. 7–10 , 49, 50

Types: Male holotype and 5 male and 3 female paratypes from Spring Creek Hatchery, State Route 14, 45.7280°, -121.5445°, 50’ asl, Skamania Co., Washington, collected 30 November 2003 by W. Leonard. Parts of these specimens are mounted on SEM stub WAS34-9 .

Diagnosis: Distinct from A. nazinta in the longer, finger-like extension of the ninth leg telopodite; and from A. crawfordi in the differing shape of the gonopod (compare Figs. 47, 48 with 49, 50), and having more numerous ommatidia.

Etymology: The species epithet fontinalis (Latin: of the spring) is an adjective referring to the type locality, Spring Creek Federal Fish Hatchery.

Description: Male holotype. Length, about 10 mm, width 0.9–1.0 mm. Seven to 9 small, round, black ommatidia in triangular patch. Labrum without hooks ( Fig. 8 ); mandible not modified. First legpair larger than second and third, femur and postfemur with long, needle-like setae ( Fig. 8 ). Second legpair coxae fused in midline and to their respective trochanters, short apophysis with specialized setae on trochanteral part. Third coxal flasks basally fused, distally tightly appressed in midline, enlarged, sharply angled anteriorly; third telopodites reduced in size, prefemur with strong, distoventral lobe ( Fig. 8 ). Pleurotergal bars of third ring broad ( Fig. 8 ), not touching in midline. Coxae of legpairs four and five not modified. Pygidium short. Color pale tan (after long preservation).

Gonopods ( Figs. 7 , 9, 10 , 49, 50 ) with anterior angiocoxite apically divided; lateral branch slender, rebranched but with fewer subdivisions than in A. crawfordi , which are stouter, deflexed and notched at tip. Posterior angiocoxite apically expanded, in situ sheathing three or four flagellocoxites. Ninth legpair coxae without prominent apophysis, telopodite ( Fig. 10 ) with long, finger-like extension.

Females similar to males in nonsexual characters.

Distribution: Known only from the type locality.

Figures

FIGS. 5–7. Amplaria crawfordi, A. fontinalis. Figs. 5, 6. Amplaria crawfordi. Fig. 5. Gonopods, anterior view. Fig. 6. Legpairs 2 and 3, ventral view. Fig. 7. A. fontinalis, left gonopod, lateral view.

FIGS. 8–10. Amplaria fontinalis. Fig.8. Head and first 3 rings of male, ventral view. Fig. 9. Left gonopod, mesal view. Fig. 10. Gonopod tips, posterior view.

FIGS. 45–54. Drawings of gonopods of Amplaria species. Fig. 45. Left gonopod of A. nazinta, lateral view. Fig. 46. Tip of anterior angiocoxite of A. nazinta gonopod, lateral view. Fig. 47. Right gonopod of A. crawfordi, mesal view. Fig. 48. Tip of anterior angiocoxite of A. crawfordi, lateral view. Fig. 49. Right gonopod of A. fontinalis, mesal view. FIG. 50. Tip of anterior angiocoxite of A. fontalis, posteriolateral view. Fig. 51. Right gonopod of A. rykkenae, mesal view. Fig. 52. Right gonopod of A. rykkenae, lateral view. Fig. 53. Right gonopod of A. baughi, lateral view. Fig. 54. Right gonopod of A. umatilla, lateral view.