Redescription of Ctenapseudes sapensis (Chilton, 1926) from the Upper Songkhla Lagoon, Thailand (Crustacea: Tanaidacea)

The parapseudid tanaidacean Ctenapseudes sapensis (Chilton, 1926) is minutely redescribed and illustrated. The species is very similar to C. chilkensis, described by the same author based on samples from the brackish Chilka Lake in India (Chilton, 1924). C. sapensis was the only apseudomorph tanaidacean found in Upper Songkhla Lagoon, southern Thailand.This species is dominant in this lagoon, and, at the same time, is a major food source for some catfishes (Osteogeneiosus militaris, Arius truncatus and Arius maculatus)

Macrobenthic fauna community in the Middle Songkhla Lake, Southern Thailand

A bimonthly investigation of macrobenthic fauna at the area from Ban Pak Khat to Ban Leam Chong Thanon in the Inner Songkhla Lake from February 1998 to February 1999 was undertaken to determine the species richness and abundance. A total of 7 phyla and 161 species were identified. Annelida (58 species), Arthropoda (64 species) and Mollusca (23 species) were the major phyla while Nemertea (1 species), Platyhelminthes (1 species), Cnidaria (4 species) and Chordata (10 species) were the minor. Fifty-seven speciesof Polychaete annelids were found. The highest species richness (14 species) was in the Nereididae Family, of which Ceratonereis burmensis and Namalycastis indica were predominant. Nephtys sp. and Heteromastus sp. were not so highly abundant but appeared at almost all stations through every sampling month, while Prionospio cirrifera and Pseudopolydora kempi were found in higher densities but with narrower distribution. Ficopomatus sp. and unidentified Terebellidae were not commonly found, but occasionally reached a high density. Amphipods gave the highest species richness (22 species), with Photis longicaudata distributed widely and in all months. Five species of Tanaidaceans were found with Apseudes sapensis the second most dominant (max. 5044 individuals m-2 in February) in the overall fauna. Isopoda were not as densely found as tanaidaceans but there were many species (18 species). Cyathura sp.1 was the most dominant isopod. Brachidontes arcuatulus was the most dominant bivalve (max. 29449 individuals m-2 in April), especially at stations with a sand-gravel substrate. The mean density of total macrobenthic fauna among stations ranged from 920 to 10620 ind. m-2 while the monthly densities ranged from 1520 to 6160 ind.m-2. The mean density of macrobenthic fauna was highest in the dry season (April). The species richness among stations ranged from65 to 105 species while varying from 81 to 112 species during the different months. The highest species richness was in the SW monsoon season (light rain, June-August). Polychaetes and molluscs tended to decrease in the NE monsoon season with heavy rain from December-February, while crustaceans increased during this time. The best fitting of the environmental variables to explain the macrobenthic fauna community pattern of the Inner Songkhla Lake was an 8-variable combination of %clay, %silt, %organic carbon, soil pH, depth, dissolved oxygen, total suspended solid and temperature (harmonic rank correlation coefficient, ρw = 0.84)

Distribution of Trace Elements in Sediments and Biota of Songkhla Lake, Southern Thailand

The concentrations of Co,Ni, Cu, Zn, Cd, Pb,As, Fe, Mn, and Al were determined in sediments and biota of Songkhla Lake, a shallow coastal lagoon located in southern Thailand. In June 2006, surface sediments were sampled in 44 stations in the three sections of the lake (inner-, middle-, and outer sections). Sediment cores were also sampled in 13 stations in three cross-sections of the lake. In surface sediments, trace and major elements, organic matter, sediment grain size analysis, and sulfides were determined, and in the sediment cores, redox profiles were made. Soil samples were also collected at garbage dumping sites in the vicinity of the lake. In addition, the metal accumulation in two catfish species (Arius maculatus and Osteogeneiosus militaris) and the crustacean (Apseudes sapensis) was also investigated. Trace element concentrations in sediments of Songkhla Lake show that, especially the Outer section of the lake, in particular the sediments atthe mouths of the Phawong, U-Taphao, and Samrong Canals are significantly enriched with trace elements due to municipal, agricultural, and industrial discharges entering the lake through the canals. Aluminumnormalized enrichment factors throughout the lake vary from 0.4 to 1.7 for Ni, 0.3 to 3.3 for Cu, 0.2 to 7 for Zn, 0.1 to 14 for As, 1 to 24 for Cd, 0.7 to 6.8 for Pb, and 0.1 to 7.8 for Mn. Correlations between the elements and sediment characteristics show that Cu, Zn, Cd, and Pb are essentially associated with the sulfide fraction; that Ni and Co are predominantly bound to the clay minerals and iron oxy-hydroxides, and that As is principally bound to iron oxy-hydroxides. The accumulation of trace elements between muscle tissue and liver and eggs of A. maculatus and O. militaris is element-specific, but concentrations of trace elements in fish muscle tissue are well within the limits for human consumption

High pressure treatment effects on cod (Gadus Morhua) muscle

SIGLEAvailable from British Library Document Supply Centre-DSC:DXN021922 / BLDSC - British Library Document Supply CentreGBUnited Kingdo

Birdotanais Songkhlaensis, A New Genus And Species Of Nototanaidae (Crustacea: Tanaidacea) From Thailand

Kakui, Keiichi, Angsupanich, Saowapa (2012): Birdotanais Songkhlaensis, A New Genus And Species Of Nototanaidae (Crustacea: Tanaidacea) From Thailand. Raffles Bulletin of Zoology 60 (2): 421-432, DOI: http://doi.org/10.5281/zenodo.534985

Description of three species of Halmyrapseudes (Crustacea: Tanaidacea: Parapseudidae), with a discussion of biogeography

Kakui, Keiichi, Angsupanich, Saowapa (2013): Description of three species of Halmyrapseudes (Crustacea: Tanaidacea: Parapseudidae), with a discussion of biogeography. Zootaxa 3736 (4): 345-367, DOI: 10.11646/zootaxa.3736.4.

Kamaka songkhlaensis Ariyama, Angsupanich & Rodcharoen, 2010, sp. nov.

Kamaka songkhlaensis sp. nov. (Figs 6–9) Kamaka cf. taditadi Angsupanich et al., 2005: 375. — Ruensirikul et al., 2007: 1233, fig. 5. Not Kamaka taditadi Thomas & Barnard, 1991: 311, figs 1–4. — Krapp-Schickel & Myers, 2006: 1091, figs 5–7. Material examined. Holotype: male, 2.5 mm (OMNH-Ar- 7754), Outer Songkhla Lagoon (Fig. 1 B; 07° 11 '04''N, 100 ° 25 '03''E), 0.35 m deep, fine sand, 21 psu in salinity, 10 Oct. 2008, coll. S. Angsupanich. Allotype: female, 2.4 mm (OMNH-Ar- 7755), same data as holotype. Other paratypes: 2 males, 2.2, 1.7 mm (OMNH-Ar-7756, 7757); 2 males and 1 female, 1.9, 1.8, 2.2 mm (PSUZC-CR0229 to 0231); 1 male and 1 female, 1.9, 2.2 mm (PSUZC-CR0232, 0233; not dissected), same data as the holotype. Description. Male [based on holotype, 2.5 mm (OMNH-Ar- 7754)]. Body (Fig. 6) slender, smooth. Eyes medium-sized. Antenna 1 (Fig. 7 A) with ratio of lengths of peduncular articles 1–3 1: 1.2: 0.9, peduncular article 1 with 2 penicillate setae at ventrodistal corner; flagellum with 9 medium-sized articles, articles 7–9 each with aesthetasc at ventrodistal corner. Antenna 2 (Fig. 7 B, B 1) with distinct swelled article 4, ratio of lengths of peduncular articles 3–5 1: 2.6: 1.7; flagellum with 1 long, 4 medium-sized and 1 tiny distal article, article 1 excavate posteriorly, with serrate posterior margins, tip of article 5 with several setae. Upper lip (Fig. 7 C) bearing short thin setae. Mandible (Fig. 7 D, D 1, E, E 1) with left and right incisors bearing 4 and 5 cusps, respectively; left lacinia mobilis with 4 cusps, right 2 cusps; tips of accessory blades blunt (acute in paratypes); palp with article 3 broadened distally, article length ratio 1: 1.4: 1.2, articles 1–3 with 1, 6 and ca. 13 setae, respectively. Lower lip (Fig. 7 F) with mandibular process short, central part of outer lobe with a roundish cavity-like structure, apical parts of inner and outer lobes covered with thin setae. Maxilla 1 (Fig. 7 G, G 1) with outer plate bearing 10 robust setae apically; tip of palp article 2 with 4 robust, 4 thin and many feeble setae. Maxilla 2 (Fig. 7 H) with both plates wide, setose apically. Maxilliped (Fig. 7 I) with inner plate bearing several thick plumose setae distally; outer plate with 8 medial robust setae. Gnathopod 1 (Fig. 8 A) with coxal plate large, posteroventral corner right-angled, bearing 15 fine setae and 1 robust seta on anterior/ventral and posterior margins, respectively; basis with long seta posteriorly; carpus with many thick setae and normal setae on posterior margin and medial surface, respectively; propodus setose anteriorly and posteriorly; dactylus with denticle on posterior margin. Gnathopod 2 (Fig. 8 B) with coxal plate roundish, bearing 3 ventral setae and 1 posterior robust seta; basis elongate, posterodistal corner with short seta; merus relatively short, posterodistal corner rounded; carpus roundish triangular; propodus broad, with acute process on posteroproximal corner, distal margin rounded, with many setae, posterior margin of process with several setae; dactylus elongate, strongly curved posteriorly, anterior and posterior margins each with a few setae. Pereopods 3 and 4 (Fig. 8 C, C 1, D) with coxal plates roundish square, each bearing 4 ventral setae and 1 posterior robust seta; basis of pereopod 3 with long seta; meri with several setae at anterodistal corners; dactyli short. Pereopod 5 (Fig. 8 E) with coxal plate wide, anterior lobe with a few setae ventrally, posterior lobe with short plumose seta at posteroventral corner; basis slightly expanded, anterior margin with 5 simple setae, anterodistal corner with 3 simple setae, posterior margin with 5 plumose and 1 simple setae; merus with thick seta at posterodistal corner; carpus with 1 + 3 robust setae; propodus with 2 robust and 1 plumose setae distally. Pereopod 6 (Fig. 8 F) about 1.6 times as long as pereopod 5; coxal plate narrow, anterior margin with long robust seta, posteroventral corner with short plumose seta; basis almost linear, anterior margin with 6 plumose and 2 simple setae, anterodistal corner with 1 plumose and 3 simple setae, posterior margin with 5 plumose and 2 simple setae; merus with anterodistal robust seta and posterodistal long seta; carpus with 1 + 1 + 4 robust setae; propodus with 1 + 2 robust setae, distal end with 3 long and 2 short simple setae and 1 plumose seta; dactylus curved. Pereopod 7 (Fig. 8 G) about 1.2 times as long as pereopod 6; coxal plate not lobate, posteroventral corner with short plumose seta; basis almost linear, anterior margin with 5 plumose and 1 simple setae, anterodistal corner with 3 simple setae, posterior margin with 6 plumose and 2 robust setae; merus with 1 + 1 long robust setae posteriorly; carpus with 1 + 1 + 2 robust setae; propodus with 1 + 2 anterior and 1 posterior robust setae, distal end with 4 long and 2 short simple setae and 1 plumose seta; dactylus curved. Pleon 1 with 1 plumose and 1 simple setae ventrally, pleon 2 with 2 ventral and 1 posteroventral plumose setae (Fig. 9 A). Pleopod 3 shortest (Fig. 9 B–D); peduncles of pleopods each with a few plumose setae and 2 coupling hooks; outer rami shorter than inner, outer rami of pleopods 2, 3 with 8 and 7 articles and inner rami of pleopods 1–3 with 7, 7 and 6 articles, respectively. Uropod 1 (Fig. 9 E) with peduncle bearing 3 robust setae on dorsal surface; outer ramus shorter than inner, both rami each with 1 marginal and 4 terminal robust setae. Uropod 2 (Fig. 9 F) with peduncle bearing 3 dorsal robust setae; outer ramus shorter than inner, both rami each with 1 marginal and 4 terminal robust setae. Uropod 3 (Fig. 9 G, H) with peduncle bearing distal robust seta on medial margin; ramus short, distal end obtuse, with 2 thick and 2–3 normal setae. Telson (Fig. 9 H) short, not coalesced with urosomite 3; dorsodistal margin with a pair of simple and penicillate setae. Female [based on allotype, 2.4 mm (OMNH-Ar- 7755)]. Generally similar to male except for antenna 2, gnathopods and oostegites. Antenna 2 (Fig. 9 I) with peduncular article 4 slender, article 1 of flagellum without excavation. Gnathopod 1 (Fig. 9 J) with coxal plate smaller than that of male, posteroventral corner rounded. Gnathopod 2 (Fig. 9 K) with coxal plate roundish-square, bearing several ventral setae and 1 posterior robust seta; basis bearing 4 setae on anterior margin, posterior margin with 2 long setae, posterodistal corner with 3 setae; merus relatively long, distal end truncate; carpus roundish triangular, anterior margin and posterodistal corner setose; propodus setose anteriorly and posteriorly, palm oblique, defined by small robust seta; dactylus relatively stout; oostegite on gnathopod 2 small, with single long seta. Shape change in male gnathopod 2 with growth. Paratype, 2.2 mm (OMNH-Ar- 7756): propodus narrower than that of the holotype, distal margin with small spine (Fig. 9 L). Paratype 1.7 mm (OMNH-Ar- 7757): propodus narrower than that of OMNH-Ar- 7756, posterior process short, distal margin with blunt projection posteriorly, dactylus stout (Fig. 9 M). Etymology. Referring to the type locality. Remarks. This new species is characterized by the swelled peduncular article 4 of antenna 2 and the wide propodus of gnathopod 2 in adult male, and shares these characters with Kamaka poppi and K. taditadi. However, K. poppi has the following characters (Bamber, 2003): (1) peduncular article 4 of male antenna 2 with distal spine (absent in K. songkhlaensis), (2) merus of male gnathopod 2 long (relatively short in K. songkhlaensis), (3) distal margin of propodus of male gnathopod 2 almost straight (convex in K. songkhlaensis), (4) carpi of male pereopods 3, 4 short (relatively long in K. songkhlaensis), (5) inner rami of uropods 1, 2 without marginal spine (present in K. songkhlaensis). On the other hand, K. taditadi has the following characters (Thomas & Barnard, 1991; Krapp-Schickel & Myers, 2006): (1) posteroventral corner of male coxa 1 round (right-angled in K. songkhlaensis), (2) merus and carpus of male gnathopod 2 long (relatively short in K. songkhlaensis), (3) anterior margin of propodus of male gnathopod 2 with blunt triangular process (absent in K. songkhlaensis). In addition, the new species inhabits brackish environment, whereas K. taditadi is a marine species. Distribution. Outer Songkhla Lagoon (present study), Middle Songkhla Lagoon (Angsupanich et al., 2005) and Upper Songkhla Lagoon (Ruensirikul et al., 2007).Published as part of Ariyama, Hiroyuki, Angsupanich, Saowapa & Rodcharoen, Eknarin, 2010, Two new species of the genus Kamaka (Crustacea: Amphipoda: Kamakidae) from Songkhla Lagoon, southern Thailand, pp. 55-68 in Zootaxa 2404 on pages 62-67, DOI: 10.5281/zenodo.19416