scholarly journals A new genus and two new species of cave-dwelling cyclopoids (Crustacea, Copepoda) from the epikarst zone of Thailand and up-to-date keys to genera and subgenera of the Bryocyclops and Microcyclops groups

2018 ◽  
Author(s):  
Chaichat Boonyanusith ◽  
La-orsri Sanoamuang ◽  
Anton Brancelj
Keyword(s):  
New Species ◽  
New Genus ◽  
Distal Segment ◽  
Specific Shape ◽  
Mandibular Palp ◽  
Former Ussr ◽  
Caudal Rami ◽  
Central Thailand ◽  
Swimming Leg ◽  
Copepoda Cyclopoida

Two obligate cave-dwelling species of cyclopoid copepods (Copepoda, Cyclopoida) were discovered inside caves in central Thailand. Siamcyclops cavernicolus gen. et sp. nov. was recognised as a member of a new genus. It resembles Bryocyclops jankowskajae Monchenko, 1972 from Uzbekistan (part of the former USSR). It differs from it by (1) lack of pointed triangular prominences on the intercoxal sclerite of the fourth swimming leg, (2) mandibular palp with three setae, (3) spine and setal formulae of swimming legs 3.3.3.2 and 5.5.5.5, respectively, and (4) specific shape of spermatophore. Metacyclops thailandicus sp. nov. resembles M. cushae Reid, 1991 from Louisiana (USA). It differs from it by (1) distal segment of the endopod of the fourth swimming leg with one apical spine, (2) the fifth swimming legs with one broad segment, (3) the spine formula of the distal segment of the exopod of the swimming legs 3.4.3.3, and (4) well developed anal operculum reaching articulation with caudal rami. Detailed descriptions of the habitats of the new species and up-to-date keys to the genera and subgenera of the Bryocyclops and Microcyclops groups are provided, along with an updated list of obligate groundwater species of Copepoda in Southeast Asia.

Middle Permian (Roadian) gastropods from the Khao Khad Formation, Central Thailand: Implications for palaeogeography of the Indochina Terrane

Zootaxa ◽  
2020 ◽  
Vol 4766 (1) ◽  
pp. 1-47 ◽  
Author(s):  
CHATCHALERM KETWETSURIYA ◽  
BARAN KARAPUNAR ◽  
THASINEE CHAROENTITIRAT ◽  
ALEXANDER NÜTZEL
Keyword(s):  
New Species ◽  
Shallow Water ◽  
South China ◽  
New Genus ◽  
Middle Permian ◽  
Late Permian ◽  
Gastropod Species ◽  
Late Palaeozoic ◽  
Central Thailand

A new Permian gastropod assemblage from the Roadian (Middle Permian) Khao Khad Formation, Saraburi Group (Lopburi Province, Central Thailand) which is part of the Indochina Terrane, has yielded one of the most diverse Permian gastropod faunas known from Thailand. A total of 44 gastropod species belonging to 30 genera are described herein, including thirteen new species and one new genus. The new genus is Altotomaria. The new species are Bellerophon erawanensis, Biarmeaspira mazaevi, Apachella thailandensis, Gosseletina microstriata, Worthenia humiligrada, Altotomaria reticulata, Yunnania inflata, Trachydomia suwanneeae, Trachyspira eleganta, Heterosubulites longusapertura, Platyzona gradata, Trypanocochlea lopburiensis and Streptacis? khaokhadensis. Most of the species in the studied assemblage represent vetigastropods  (35.6%) and caenogastropods (26.7%) and most of the species belong to Late Palaeozoic cosmopolitan genera. The studied faunas come from shallow water carbonates that are rich in fusulinids, followed by gastropods, ostracods, bivalves and brachiopods. The gastropod assemblage from the Khao Khad Formation shares no species with the gastropod assemblages from other Permian formations in Thailand, the Tak Fa Limestone and the Ratburi Limestone. However, it is similar to the Late Permian gastropod faunas from South China of the Palaeo-Tethys, therefore it suggests that the Indochina Terrane was not located far from South China. 

Species of the Maera-clade collected from Japan. Part 1: genera Maeropsis Chevreux, 1919 and Orientomaera gen. nov. (Crustacea: Amphipoda: Maeridae)

Zootaxa ◽  
2018 ◽  
Vol 4433 (2) ◽  
pp. 201
Author(s):  
HIROYUKI ARIYAMA
Keyword(s):  
New Species ◽  
New Genus ◽  
Ariake Sea ◽  
The World ◽  
Okinawa Prefecture ◽  
Mandibular Palp

The Maera-clade is a group of maerid amphipod genera which has neither a falcate mandibular palp nor medially setose inner plates of maxillae 1 and 2. Two species of Maeropsis Chevreux, 1919 and four species of Orientomaera gen. nov. included in the clade, are described from Japan. Maeropsis okinawensis sp. nov. is described, based on collections from Okinawa Prefecture. It resembles M. cobia Krapp-Schickel, 2009, M. paphavasitae Wongkamhaeng, Coleman & Pholpunthin, 2013, and M. serratipalma (Nagata, 1965). This new species differs from the latter three species in the long uropod 3. Maeropsis serratipalma is redescribed and newly recorded from Kanagawa, Osaka and Wakayama Prefectures. The new genus, Orientomaera, is described and is characterized by the mandibular palp article 1 without a distal tooth and the oblique palm of the gnathopod 2 with many robust setae. Orientomaera comprises four species: O. brevispina (Kim & Kim, 1991) comb. nov. from Iwate, Fukui, Kyoto and Wakayama Prefectures and Ariake Sea; O. decipiens sp. nov. from Osaka and Wakayama Prefectures; O. obliquua sp. nov. from Osaka and Wakayama Prefectures; O. rotundicoxa sp. nov. from Kanagawa and Wakayama Prefectures. These species can be distinguished from one another by the coxa 1, the gnathopod 2 propodus, the pereopod 6 basis and the telson. Keys to species of Maeropsis and Orientomaera in the world are provided. 

scholarly journals Theosbaena loko sp. n. a new stygobiotic microshrimp (Thermosbaenacea: Halosbaenidae) from southern Thailand

2020 ◽  
Vol 8 ◽  
Author(s):  
Sopark Jantarit ◽  
Rueangrit Promdam ◽  
Koraon Wongkamhaeng
Keyword(s):  
New Species ◽  
Conservation Status ◽  
Distal Segment ◽  
Thermal Springs ◽  
Oriental Region ◽  
The Third ◽  
Southern Thailand ◽  
Basal Width ◽  
Anchialine Caves ◽  
Central Thailand

Thermosbaenaceans are subterranean crustaceans, widespread and occur in freshwater, oligohaline or anchialine caves or thermal springs. Currently, four families, seven genera,and 45 species are recognised worldwide. During our studies of the isolated karst, Tham Loko (Loko Cave) in Khao Chiason District, Phatthalung Province, we found an undescribed thermosbanacean species in the genus Theosbaena. Theosbaena is the only genus reported from freshwater in the Oriental Region. Previously, there were only two known species, Theosbaena cambodjiana Cals & Boutin, 1985 from Kampot Province, southern Cambodia and Khon Kaen, Thailand and T. kiatwongchai Rogers & Sanoamuang, 2016 discovered in a cave of Takhli District, Nakhon Sawan, central Thailand. Our new species is the third species recorded in the Oriental Region. Theosbaena loko sp. n. differs from its congeners by having a telson 1.8x longer than its breadth, maxilla 1 palp distal segment 4x longer than the proximal palpomere and the maxillopodal exopod twice as long as its basal width. This microshrimp is the third described species of the genus. A key to the species is given and suggestions for the conservation status of the new species are discussed.

scholarly journals Eucyclops delongi sp. nov. (Cyclopiformes: Copepoda: Crustacea) from the River Lena delta, Polar Eastern Siberia, Russia

2019 ◽  
Vol 323 (4) ◽  
pp. 575-580
Author(s):  
V.R. Alekseev ◽  
E.N. Abramova ◽  
O.A. Chaban
Keyword(s):  
New Species ◽  
Distal Segment ◽  
Width Ratio ◽  
Posterior Surface ◽  
Eastern Siberia ◽  
North East ◽  
Distal Side ◽  
Length Width ◽  
Caudal Rami ◽  
Lena Delta

A new species of Eucyclops (Cyclopiformes: Copepoda: Crustacea) is described from a bog-lake on the top of a hill near Titary fisherman village in the top of The River Lena delta, Eastern Siberia, Russia. Eucyclops delongi sp. nov. belongs to the speratus group of species and can be clearly separated from other related species by a combination of characters that include smooth hyaline membrane on 3 distal segments of antennule, missing of long hairs on antenna basipodite posterior surface (on the top), presence of several long setules on the distal side of the caudal rami (saw), homogeneous hair row on both sides of inner coxal spine in 4th swimming legs, relatively short caudal rami (length/width ratio less than five), clearly seen difference in caudal saw denticles on lateral edge, very long innermost caudal seta subequal to ramus length, inner spine of distal segment of endopodite 4th swimming leg 1.1 times as long as segment itself. Male of new species can also be separated from other species by a combination of the following characters: antenna basipodite on posterior surface without groups of long hairs (on the top), coxal spine of 4th swimming legs homogenously covered with long hairs, rudimental 5th legs with relatively short inner spine similar in length to segment itself, rudimental 6th legs with 3 appendages including strong inner spine reaching the middle of the next segment, outer seta as long as spine, middle seta is shorter than spine. This species is suggested to be an endemic of Arctic zone in Eastern Siberia (Beringia), which is well known as a Pleistocene refuge during glaciation in North-East Asia.

scholarly journals Transkalliapseudes spinulata, new genus, new species (Crustacea: Tanaidacea: Kalliapseudidae) from the northwest Australian shelf

Zootaxa ◽  
2006 ◽  
Vol 1298 (1) ◽  
pp. 17
Author(s):  
DAVID T. DRUMM ◽  
RICHARD W. HEARD
Keyword(s):  
New Species ◽  
Continental Shelf ◽  
New Genus ◽  
New Genus And Species ◽  
Unique Character ◽  
Mandibular Palp ◽  
To Receive

A new kalliapseudid genus, Transkalliapseudes is erected to receive T. spinulata, n. sp. The description of the new genus and species are based on two males collected at depths of 44–82 m from the Northwest Continental Shelf of Australia. Transkalliapseudes n. gen. shares most features (setation of uniarticulate mandibular palp, cheliped, and dactylus of pereopod I) with those of the subfamily Kalliapseudinae; however, the dactylus on pereopods IV–VI are similar to those found in the subfamily Hemikalliapseudinae, as well as, some species of Kalliapseudes. The presence of numerous granular-like spinules on appendages of T. spinulata appears to be a unique character. A key and table for the separation of the genera within the subfamily Kalliapseudinae is presented.

Asterocherids (Copepoda: Siphonostomatoida) associated with marine invertebrates in the Strait of Gibraltar

Zootaxa ◽  
2011 ◽  
Vol 2925 (1) ◽  
pp. 1 ◽  
Author(s):  
MERCEDES CONRADI ◽  
Mª EUGENIA BANDERA
Keyword(s):  
New Species ◽  
Marine Invertebrates ◽  
Strait Of Gibraltar ◽  
Similar Length ◽  
Outer Lobe ◽  
Mandibular Palp ◽  
Sampling Programme ◽  
Symbiotic Copepods ◽  
Caudal Rami ◽  
A New Species

Six years ago, an ongoing sampling programme to seek symbiont copepods was initiated in the Strait of Gibraltar. Most of the copepod species reported in this area (48%) belonged to the families Notodelphyidae and Botryllophilidae and nearly 30% of them were new to science. This paper describes a new species of Asterocheres (Asterocheridae, Siphonostomatoida) and redescribes two poorly known species of this genus. Asterocheres tarifensis n. sp. was found living in association with Astroides calycularis, a coral that hosts a variety of symbiotic copepods. This new species differs from its congeners by the possession of the following combined characters: body cyclopiform, 21-segmented antennule in female, 2-segmented mandibular palp, siphon reaching the insertion of maxilliped, maxilla without aesthetasc, maxilliped 5-segmented, armature of the antennary exopod consisting of two setae, inner lobe and outer lobe of maxillule each armed with four setae, genital area armed with two setae, fifth leg exopod with three setae, and caudal rami about as long as wide. Furthermore, two poorly known Asterocheres species are redescribed revealing some discrepancies with their previous descriptions. Asterocheres minutus is characterized by having a 21-segmented antennule, a very short oral siphon, a 1-segmented mandibular palp, and the two lobes of the maxillule with a similar length. The cladistic model of budding hypothesis is proposed for the origin of the two sibling Asterocheres species: A. minutus and A. echinicola. Asterocheres siphonatus is distinguished by a combination of characters that include a 21-segmented antennule, an oral siphon extending to the intercoxal plate of leg 4 and the 1-segmented mandibular palp. The controversy concerning the name of this species is also studied.

scholarly journals A new species of Eucyclops Claus (Copepoda: Cyclopoida) from Southeast Mexico with a key for the identification of the species recorded in Mexico

Zootaxa ◽  
2004 ◽  
Vol 617 (1) ◽  
pp. 1 ◽  
Author(s):  
E. SUÁREZ-MORALES
Keyword(s):  
New Species ◽  
Relative Length ◽  
Nominal Species ◽  
South American ◽  
The South ◽  
Southeastern Pacific ◽  
Outer Seta ◽  
Caudal Rami ◽  
A New Species ◽  
Copepoda Cyclopoida

Eucyclops torresphilipi sp. nov. is described from samples collected in the state of Chiapas, on the southeastern Pacific coast of Mexico. It belongs to a group of species similar to the presumably cosmopolitan E. agilis (Koch, 1838). The new species is closest to the South American E. delachauxi (Kiefer, 1925); it can be distinguished from its congeners by a combination of characters that include a fifth leg with a particularly slender inner spiniform seta that is as long as the outer seta, the caudal rami has spinules covering up to of the outer margin, caudal rami over 4 times longer than wide, the relative length of the dorsal seta, and the proportion of the terminal spines of the third exopodal segment of the fourth legs. Only nine other nominal species of Eucyclops have been recorded in Mexico; nearly half of them are known also from South America. The new species seems to have a restricted distributional range; however, it could be present also in Guatemala. Its morphological affinity with South American forms confirms the influence of the South American cyclopoid fauna in Mexico. A key for the identification of the species of Eucyclops recorded in Mexico is included.

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