TY - JOUR
AU - Thanh, Dang Ngoc
AU - Anh, Le Hung
PY - 2012/06/05
Y2 - 2024/07/20
TI - New Amphipoda crustaceans species recently found in Vietnam nearshore waters
JF - Academia Journal of Biology
JA - AJB
VL - 34
IS - 2
SE - Articles
DO - 10.15625/0866-7160/v34n2.951
UR - https://vjs.ac.vn/index.php/vjbio/article/view/951
SP - 145-157
AB - <p>Taxonomical study recently realized with materials collected from nearshore waters of Vietnam has contributed 7 new species to science, belonging to families: Amphithoidae, Corophiidae, Liljeborgidae, Lysianassidae and Synopiidae.</p> <p><strong><em>Cymadusa exavata</em></strong><strong> sp. n. </strong>(Figs. 1-16)</p> <p><em>Male:</em> Body large in size. Anterofrontal margin with low ocular lobe. Eyes subquadrate, reddish. Antennae 1 and 2 subequal in length, reaching midpoint of body length. Antennae 1 with 1<sup>st</sup> and 2<sup>nd</sup> peduncular article similar in length. Flagellum 26-articulated, accessory flagellum 1 articulate. Antennae 2 with 4<sup>th</sup> as long as in length with 5<sup>th</sup> peduncular article, flagellum 24-articulated. Mandibule palp 3-jointed, 2<sup>nd</sup> and 3<sup>rd</sup> joints equal in length, with distal long seta. Gnathopod 1 (male) with 5<sup>th</sup> article cup form, 6<sup>th</sup> article large, subquadrate, palm transverse widely excavated, delimited by a strong tooth. Gnathopod 2 with slender, curve 2<sup>nd</sup> article. 5<sup>th</sup> and 6<sup>th</sup> article subequal in length, the later one subretangular, palm oblique, short. Claw like 7<sup>th</sup> article overeaching beyond palm. Uropod 1 with ramus unequal, lateral margin setose. Uropod 2 with equal ramus. Uropod 3 with rami longer than 1/2 peduncle. Telson quadrate distally setose.</p> <p><em>Female:</em> Unknown.</p> <p><strong><em>Kanaka quadrata </em></strong><strong>sp. n. </strong>(Figs. 17-32)</p> <p><em>Male:</em> Anterolateral cephalic lobe developed, reaching nearly distal margin of 3th peduncular article of Ant 2. Eyes large, occupied the whole cephalic lobe. Antennae 1, 2<sup>nd</sup> and 3<sup>rd</sup> peduncular articles subequal in length. Flagellum 8-articulated. Antennae 2 with 4<sup>th</sup> peduncular article very long, inflated, distal angle with a hooked tooth. 5<sup>th</sup> article stick shaped, 1/2 as long as 4<sup>th</sup> article. Gnathopod 1 with coxa anteriorly and posteriorly prolonging, 4<sup>th</sup>, 5<sup>th</sup> and 6<sup>th</sup> articles subequal in length. Gnathopod 2 with 2<sup>nd</sup> article slender, 5<sup>th</sup> subtriangular, 6<sup>th</sup> article widely quadrate, palm transverse, delimited by a strong tooth. Uropod 3 uniramus. Telson lobe medially excavated. Urosomit coalescent.</p> <p><em>Female: </em>Sexual dimorphism in antennae 2, gnathopod 1 and 2 structures.</p> <p><strong><em>Listriella tuberculata </em></strong><strong>sp. n. </strong>(Figs. 33-50)</p> <p><em>Male: </em>body small in size, whitish. Eyes round, large. Antennae 1 with 1<sup>st</sup> peduncular article large, 3<sup>rd</sup> article very small, flagellum 12-articulated, accessory flagellum 3-articulated. Antennae 2 with 4<sup>th</sup> and 5<sup>th</sup> peduncular articles equal in length. 14-articulated. Mandibule palp 3-jointed the 2<sup>nd</sup> the longest. Gnathopod 1 (male) with 5<sup>th</sup> article flat, cup form in shape, 6<sup>th</sup> ovate, palm overeaching midpoint of posterior margrin, setose and spinose, delimited 2 small tubercular spines. In proximal part near to basis occuring 3 large tubercules. Gnathopod 2 with similar structure, but 6<sup>th</sup> article with palm without tubercules at proximal part, only setose. Urosomit with a spine in dorsal margin. Uropod 1 with ramis subequal, longer than peduncle, outer ramus slender, biarticulate inter ramus lanceolate. Telson bilobed slender, distally spinose epimera 1-3 with poster distal angles untoothed. Pleonit segment dorsal margin smooth.</p> <p><strong><em>Hippomedon pluriarticulatus </em></strong><strong>sp. n. </strong>(Figs. 51-60)</p> <p>Male: body large in size. Dorsal margin without carina. Eyes large, reniform. Antennae 1 with 1<sup>st</sup> peduncular article longer than 2<sup>nd</sup> and 3<sup>rd</sup> article combined. Flagellum 16-jointed 1<sup>st</sup> joint very large. Accessory flagellum 6-articulated. Antennae 2 reaching to midpoint of body length, 4<sup>th</sup> peduncular article large subquadrate, shorter than 5<sup>th</sup> article, flagellum 46 articulate. Mandibule palp with 2<sup>nd</sup> joint the longest. Gnathopod 1 short, 5<sup>th</sup> and 6<sup>th</sup> articles subequal in length, 6<sup>th</sup> article subrectangular, palm tranverse distally located. Dactylus claw like, overeaching beyond palm, posterior margin armed with a spine. Gnathopod 2 long, 2<sup>nd</sup> article slender very long, 5<sup>th</sup> article 2 times as long as 6<sup>th</sup>, palm transverse distally located. Surface of 5<sup>th</sup> and 6<sup>th</sup> article densely setose. Claw like dactylus short, beak form. Uropod 1 and 2 rows of spines. Uropod 3 with rami longer than peduncle outer ramus biarticulate. Telson bilobed slender angle toothed. Epinera 3 with osterodistal.</p> <p><strong><em>Hippomedon bioculatus</em></strong><strong> sp. n. </strong>(Figs. 61-71)</p> <p>Male: body large in size, dorsal margin without carina. Head small, no rostrum. Eyes present with two distinct omnatidia. Antennae 1 with robust 1<sup>st</sup> article, 2<sup>nd</sup> and 3<sup>rd</sup> articles minute. Flagellum 7-articulated Antennae 2 short, reaching to 1/3 body length 4<sup>th</sup> and 5<sup>th</sup> articles equal in length, flagellum 26-jointed. Mandibule palp 3-jointed, 2<sup>nd</sup> and 3<sup>rd</sup> joints similar in length. Gnathopod 1 (male) with 5<sup>th</sup> article longer than 6<sup>th</sup>, this article elongate ovate in shape, palm oblique, reaching to 1/2 posterior margin delimited by a spine, palm margin scarcely setose. Claw like dastylus covered palm length. Gnathopod 2 with 5<sup>th</sup> longer than 6<sup>th</sup> article, this later subrectangular, densely setose on surface. Palm transvese, distally located in 6<sup>th</sup> article. Dactylus very short, beak form. Uropod 1 and Uropod 2 with rami equal peduncle, outer ramus biarticulate. Telson bilobed paralelly elongated. Epimera 3 with posterodistal angle produced to a minute tooth. Epimera 1, 2 with a spine in dorsal margin.</p> <p><strong><em>Tiron quadrioculatus </em></strong><strong>sp. n. </strong>(Figs. 72-86)</p> <p><em>Male</em><em>:</em> Dorsoanterior margin of head curving evenly to rostrum, without forming extended spine. lateral cephalic lobe round. Rostrum jointing obliquely anteroventrally. Eyes not presented, accessory eyes composed by 4 omnatidia. Antennae 1 with 2<sup>nd</sup> and 3<sup>rd</sup> articles equal in length. Flagellum 10-articulated, accessory flagellum 4-articulated. Antennae 2 with 4<sup>th</sup> peduncular article 2 times as long as 5<sup>th</sup>, flagellum <br /> 9-articulated. Mandibule palp with elongate 2<sup>nd</sup> joint. Gnathopod 1 and 2 (male) similar in structure, with 5<sup>th</sup> article slender, 2 times as long as 6<sup>th</sup> article. 6<sup>th</sup> article cylindrical, lateral inferior margin, as in 5<sup>th</sup> article, with rows of long setae. Claw like dactylus elongate. Pereopods 3-7 with short, cylindrical, 4-6 articles laterally armed with rows of spines and rudimentary distal dactylus. Uropods 1 and 2 with rami shorter than peduncle. Uropod 3 with rami longer than peduncle, outer ramus biarticulate, inner ramus with dense setose lateral margin. Telson with 2 slender lobes, slightly distally separated. Pleomit dorsal margin serrated. Urosomit 1, 2 with strong teeth in posterodorsal margin.</p> <p><strong><em>Pseudotiron sublongicaudatus </em></strong><strong>sp. n. </strong>(Figs. 87-100)</p> Male: Body small in size. Dorsoanterior margin of head forming an extended forehead protuberance. Pleonit 1-5 with serrated posterodorsal margin. Antennae 1 peduncular article equal in length with 3<sup>rd</sup>article, 2<sup>nd</sup> article short, flgagellum 15-articulated, accessory flagellum 3-articulated. Antennae 2 with 5<sup>th</sup> peduncular article shorter than 4 article, flagellum 17-articulated, lateral margin peduncular articles setose. Mandibule palp with 2<sup>nd</sup> joint 2 times as long as 1<sup>st</sup> joint. Gnathopod 1 with 5<sup>th</sup> and 6<sup>th</sup> articles elongate, slender 6<sup>th</sup> article not diffenciated, 5<sup>th</sup> article 2,5 times as long as 6<sup>th</sup> article. Claw like dactylus elongate and toothed in ventral margin. Uropod 1 and 2 with rami longer than perduncule, inner ramus longer than outer, both biarticulate. Uropod 3 with unequal 2 ramus, lateral margin densely setose. Telson bilobed, slender, slightly separated distally. Urosomit 1-3 with poster dorsal marginal spines.
ER -