Sinocorophium dongtanense Ren & Liu, 2014, sp. nov.
Creators: name: Ren, Xianqiu
name: Liu, Wenliang
Publisher: name: Zenodo
Year: 2014
Subjects: Biodiversity
Taxonomy
Animalia
Arthropoda
Malacostraca
Amphipoda
Corophiidae
Sinocorophium
Sinocorophium dongtanense

description: Sinocorophium dongtanense sp. nov.
(Figs 1–3)
Material examined. Holotype: ♂ (11.8 mm), 2005-CA-007, Dongtan wetland, Chongming island, Yangtze estuary, 31.71008°N 121.55046°E, intertidal zone, soft mud, coll. Wenliang Liu, 10 April 2005. Paratype: ♀ (12.0 mm), 2005-CA-008, Dongtan wetland, Chongming island, Yangtze estuary, 31.71008°N 121.55046°E, intertidal zone, soft mud, coll. Wenliang Liu, 10 April 2005; 8 ♀♀ (3.5–7.0 mm), 3 ♂♂ (4.0–6.0 mm), 20080528-1, Dongtan wetland, Chongming island, Yangtze estuary, 31.58587°N 121.90219°E, intertidal zone, soft mud, coll. Wenliang Liu, 28 May 2008.
Non-type material. ovigerous ♀ (6.8 mm), ♂ (7.0 mm), 20100716-1, Chongxi wetland, Chongming island, Yangtze estuary, 31.72376°N 121.24242°E, intertidal zone, soft mud, coll. Wenliang Liu, 16 July 2010.
Description. Body slender, depressed (Fig. 1 A). Head shorter than combine of pereonites 1 and 2 in length. Male rostrum not beyond lateral corners of head (Fig. 1 C). Female rostrum longer, beyond lateral corners (Fig. 1 D). Eyes small and round. Pereonites short and wide, smooth. Posterolateral angle of pleonites 1 and 2 round, with plumose setae. Pleonite 3 longer, lateroventral margin medial concave, with setae, posteroventral angle round (Fig. 1 B). Urosome free (Fig. 1 L). Telson wider than long, lateral angles projected, dorsomedial part concave, distal end slightly projected, lateral surface rough, semicircle shape (Fig. 1 M).
Male antenna 1 (Fig. 1 F, G) shorter than terminal margin of peduncular article 4 of antenna 2, peduncle longer than flagellum, length ratio of peduncular articles 1–3 about 10:5:3. Peduncular article 1 slender, inner dorsal margin serrated, with a row of small teeth, ventral margin slight concave, medial ridge serrated, with a row of small teeth and fine short hairs; peduncular article 2 shorter, basal half of ventral margin with 2 small protuberances and groups of setae; peduncular article 3 short. Flagellum 17- 18-articulated, each article with short setae. Male antenna 2 (Fig. 1 H, I) massive, peduncle stout. Inner ventral side of peduncular article 2 with 2 stout teeth, inner tooth larger than outer; peduncular article 3 shorter, inner ventrodistal side with a small projection; peduncular article 4 long and stout, inner terminal lateral side with 2 stout teeth, outer lateral tooth larger than inner, inner lateral side with 2 rows of teeth, 6 small teeth and 3 larger teeth respectively; peduncular article 5 small and shorter than 4, inner ventral side of basal half with 2 stout teeth and dispersed setae. flagellum short, about 1/4 as long as peduncle, 2-articulated. Inner ventral side of flagellar article 1 with a row of 6 small teeth, distal tooth large, and group of setae. Flagellar article 2 short, distal end with setae.
Female antenna 1 (Fig. 1 E) slender, beyond peduncular article 4 of antenna 2. Peduncle longer than flagellum. Length ratio of peduncular articles 1–3 about 5:3:2. Peduncle smooth, with setae, without teeth-row. Female antenna 2 (Fig.1 J, K) slight slender and shorter than male’s. Peduncle longer than flagellum. Inner ventral side of peduncular article 2 with 2 stout teeth also, outer lateral tooth smaller; inner ventroterminal end of peduncular article 3 with a small spine; peduncular article 4 strong, inner ventral end with 2 stout teeth, inner ventrolateral surface with 4 small teeth and a distal spine, formed a row, inner medio-lateral surface with a large teeth; inner ventrolateral surface of basal half of peduncular article 5 with 2 strong teeth. Flagellum shorter than peduncle. Flagellar article 1 long and smooth, with setae; flagellar article 2 short and small, with distal setae.
Lateral angle of upper lip (Fig. 2 G) round, medial part of anterior margin with 2 shallow notches, both side with short fine hairs. Mandible (Fig. 2 H, I): incisor with 3–4 small teeth, lacinia moblis with 3 teeth; spine-row with 3–4 spines; molar developed, triturative form; palp 2 articles, subequal to length, distal end of each article with a plumose seta. Inner lobe of lower lip developed, ridge of outer lobe with short fine hairs, lateral angles round and projected. Inner plate of maxilla I small (Fig. 2 J), outer plate with 7 spines, palp 2 articulated, article 1 short, article 2 slender, terminal end with a row of spines. Two plate of maxilla II (Fig. 2 K) narrow and longer, frontal margin and terminal end with long setae. Maxilliped strong (Fig. 2 M), inner plate with terminal setae, frontal margin of outer plate with long setae, palp 4-articulated, article 3 short, article 4 needle-form.
Coxa of gnathopod 1 narrow and long, projected forward, distal end with 3–4 setae; basis longer; length ratio of carpus and propodus about 5:4, propodus narrow and longer, ventral margin slight concave inward, palmar margin slightly arched, with small spines; dactylus claw-shaped. Gnathopod 2 normal form, coxa longer than deep; outer anterolateral side of basal part of basis with a small tooth, frontal margin smooth, without teeth; Ischium, merus, carpus and propodus normal, dactylus longer, about 2/3 as long as carpus, ventral margin with 3–4 setae.
Pereopods 3 and 4 normal form (Fig. 2 A, B), coxa shallow and long, triangular; outer anterolateral side of basal part of basis with a small tooth also; dactylus about 6/7 as long as propodus. Pereopod 5 (Fig. 2 C): anterior part of coxa wider than poster; basis stout, outer lateral side of basal part with a small tooth; anterior margin of merus with plumose setae; ventral surface of carpus with 2 rows of small teeth, terminal row with 8 stout spines, basal row with 3 small spines; ventroterminal margin with long plumose setae; propodus slender; dactylus clawshaped. Pereopod 6 similar to 5 (Fig. 2 D), but long, ventral margin of basis with long and dense plumose setae; carpus with 2 rows of spines, 7 and 4 spines respectively. Pereopod 7 slender (Fig. 2 E), coxa shallow and long, basis narrow and long, basal part wider, dorsal and ventral margins with long plumose setae; merus, carpus and propodus narrow and long; dactylus craw-shaped, shorter than 1/2 as long as propodus.
Coxal gills on pereopods 3–6, oval-form. Brood plates narrow and long from on gnathopod 2 to pereopod 5, 4 pairs, with long plumose setae.
Peduncle of pleopods broad and short (Fig. 2 F), leaf-form, posteroventral corner with paired coupling hooks. Outer rami shorter than inner rami, both margins with long plumose setae.
Uropod 1 long and strong (Fig. 1 L), peduncle longer than ramus, with a row of inner lateral strong robust setae and a row of outer lateral slender setae, outer terminal end with a row of setae of spine-form. Ramus short, outer rami longer than inner, basal outer lateral side with 3 spines, inner lateral margin with a row of spines; outer lateral margin of inner rami with a row of spines. Uropod 2 shorter, outer distolateral side of peduncle with a group of setae, inner distolateral end with a spine; both ramus subequal, two margins of outer rami with small spines; outer margin of inner rami with a row of spines. Uropod 3 short, peduncular distal part thicker than basal part, outer distal end with group of setae, inner distal end with a seta; uniramous, ramus long-oval slightly shorter than peduncular, terminal margin with setae.
Etymology. The species name is based on the typical locality, Dongtan wetland in the Yangtze estuary.
Remarks. In the genus Sinocorophium, the new species S. dongtanense and two other species S. hangangense Kim, 2012 known from brackish water regions of Korea, S. homoceratum (Yu, 1938) known from Bohai sea differ from other species in the relatively large body size (more than 10 mm). S. dongtanense is similar to S. homoceratum (Yu, 1938) by peduncular article 1 of male antenna 1 in which the inner dorsal margin and ventral margin are serrated and by antenna 2, peduncular article 4 which has two large ventrodistal teeth. It differs from the latter in the inner lateral side of peduncular article 4 of male antenna 2 which has two rows of teeth, the basal half of peduncular article 5 which has two strong teeth and first flagellar article which bears small teeth.
Distribution and habitat. Sinocorophium dongtanense is currently only known from the Yangtze estuary, inhabiting U-type tube of soft mud in intertidal zone (Fig. 3). This species is a true estuarine component, and the range of salinities for its occurrence was 0–25‰.
description: Published as part of Ren, Xianqiu & Liu, Wenliang, 2014, A new species of Sinocorophium from the Yangtze estuary (Crustacea: Amphipoda: Corophiidae: Corophiinae: Corophiini), China, pp. 95-100 in Zootaxa 3887 (1) on pages 96-100, DOI: 10.11646/zootaxa.3887.1.7, http://zenodo.org/record/227130