Burmoniscus chuanyanensis Li, 2021

Zeng, Xue-Gang, Wang, Jin, Yang, Jing-Bo & Li, Wei-Chun, 2021, Integrative taxonomy reveals a new species of the genus Burmoniscus (Isopoda, Philosciidae) from the Xuefeng Mountains, China, ZooKeys 1055, pp. 123-134 : 123

Burmoniscus chuanyanensis Li sp. nov.

Figures 2A-E , 3A-M

Type material.

Holotype. China, male, Hunan Province, Xuefeng Mountains, Chuanyanshan National Forest Park (27°42'N, 110°34'E), alt. 391 m, 14 July 2019, Wei-Chun Li and Jing-Bo Yang leg., Prep. slide no. L2007-2009, DNA no. CYS2007-2011.

Paratypes. One male, 23 females, same collection data as holotype.

Diagnosis.

Male pleopod 1 endopodite with distal portion bearing bilobated apical tip with one subapical spine-like projection between lobes.

Description.

Body length of male 7.5 mm, of females 3.5-9.0 mm. Body elliptic. Color brown with pale muscle spots on dorsal surface in preserved specimens with ethanol (Fig. 2A ). Telson triangular, lateral margin slightly concave, apex acute (Fig. 2B ). Uropod protopodite almost twice as long as wide, exopodite approximately twice as long as endopodite (Fig. 2B, C ).

Antennule. Composed of three articles, distal article bearing apical set of small aesthetasc (Fig. 3A ). Antenna. Flagellum slightly shorter than fifth article of peduncle, scattered with tiny setae, length ratio of flagellar articles 6: 4: 3, third article ending with slender apical organ, slightly longer than third article (Fig. 3B ). Mandibles. Left mandible bearing 2+1 penicils, right mandible with 1+1 penicils, molar process consisting of single plumose seta (Fig. 3C, D ). Maxillule. Inner lobe with two stout penicils and small posterior point; outer lobe with 4 + 6 (5 apically cleft) teeth (Fig. 3E ). Maxilla. Distally divided into two lobes with blunted rounded margins; inner lobe covered with thick setae (Fig. 3F ). Maxilliped. Endite nearly rectangular, subapically with penicil; palp two-segmented (Fig. 3G ).

Pereopods (Fig. 3H, I ). Pereopod 1 and pereopod 7 without sexual dimorphism.

Pleopods, sexual differentiation. Male pleopod 1 exopodite heart-shaped, outer margin sinuous, inner margin broadly rounded, distal portion triangular bearing one row of small setae on inner margin (Fig. 3J ); endopodite with broad basal part, narrowed towards apical tip, apical tip bilobed, subapical part bearing one spine-like projection on middle (Fig. 3K ). Pleopod 2 exopodite slightly concave on outer margin, inner margin slightly convex and covered one line of small setae at distal portion (Fig. 3L ); endopodite longer than exopodite, with distal article long and narrowed apically (Fig. 3M ).

Etymology.

The new species is named after the national forest park where the type specimens were collected.

Figures

Figure 2. Burmoniscus chuanyanensis Li, sp. nov., paratype, male A habitus in dorsal view; blue circles showing insertion of noduli laterales B pleon in dorsal view C pleon in ventral view D pleopod 1 exopodite E pleopod 1 endopodite.

Figure 3. Burmoniscus chuanyanensis Li, sp. nov., holotype A antennule B antenna C left mandible D right mandible E maxillule F maxilla G maxilliped H pereopod 1 I pereopod 7 J pleopod 1 exopodite K pleopod 1 endopodite L pleopod 2 exopodite M pleopod 2 endopodite.