Neorhynchoplax chipolini

Hsueh, Pan-Wen, 2018, A new species of Neorhynchoplax (Crustacea: Decapoda: Brachyura: Hymenosomatidae) from Taiwan, Zootaxa 4461 (3), pp. 350-358: 351-352

publication ID

https://doi.org/10.11646/zootaxa.4461.3.2

publication LSID

lsid:zoobank.org:pub:8E33BA1C-7CDF-47BA-AB5E-D3480E68BFD4

persistent identifier

http://treatment.plazi.org/id/03C3AA76-FFE0-F20B-FEB0-91E8BA82B199

treatment provided by

Plazi

scientific name

Neorhynchoplax chipolini
status

sp. nov.

Neorhynchoplax chipolini  sp. nov.

FIgS 1A, B View Figure , 2A – F View Figure , 3A – F View Figure

Material examined. HOLOTyPE, MALE (2.5 X 2.3 MM) (NMNS 7878-1), XINgdA HARbOUR (22°50´38.1˝N 120°12´46.7˝E), 29 SEPTEMbER 2017. PARATyPES: 1 MATURE FEMALE, 3 OVIgEROUS FEMALES (SMALLEST 4.4 X 4.3 MM, LARgEST 5.2 X 5.2 MM) (NMNS 7878-2–5), 6 JULy 2017, SAME LOcATION AS HOLOTyPE  ; 2 OVIgEROUS FEMALES (3.4–3.9 X 3.3–3.9 MM) (NMNS 7878-6–7), 29 SEPTEMbER 2017, SAME LOcATION AS HOLOTyPE  .

Description. CARAPAcE SUbcIRcULAR (RANgE OF L/W RATIO: 0.94–1.09), SURROUNdEd by A dISTINcT RIMAbout RIM, NOTAbout NOT dISRUPTEd AT bASE OF ROSTRUM; dORSAL SURFAcE SMOOTH ANd cONcAVE, dISTINcT cERVIcAL, THORAcIc ANd gASTROcARdIAc gROOVES PRESENT; cERVIcAL gROOVES REAcHINg ANTEROLATERAL MARgINS, THORAcIc gROOVES REAcHINg POSTEROLATERAL bORdER, WITH FOUR dEEP PITS AT jUNcTION OF HEPATIc, PREbRANcHIAL ANd gASTRIc AREAS ANd jUNcTION OF POSTbRANcHIAL ANd cARdIAc AREAS NEAR POSTEROLATERAL bORdER ( FIg. 1A View Figure ). ROSTRUM dISTINcTLy TRIdENTATE, LATERAL TEETH TRIANgULAR WITH bLUNT TIP, dIREcTEd ANTERIORLy; MEdIAN TOOTH STyLIFORM, dISTINcTLy bENT dOWNWARdS ( FIg. 1B View Figure ). ANTEROLATERAL MARgINS OF cARAPAcE SMOOTH ( FIgS. 1A View Figure , 2A View Figure ), LINEd WITH NUMEROUS SHORT SETAE; SIdE WALL OF cARAPAcE WITH dISTINcT ANTERIORLy cURVEd TOOTH dIREcTLy AbOVE cOXA OF SEcONd AMbULATORy LEg ( FIgS. 1A View Figure , 2B View Figure ); INFRAORbITAL TOOTH SHORT, SHARP ( FIgS. 1A View Figure , 2A, B View Figure ). EyESTALk VISIbLE dORSALLy, cORNEAS LARgE, PIgMENTEd ( FIgS. 1A, B View Figure , 2A, B View Figure ). THIRd MAXILLIPEd LONgITUdINALLy SLENdER, NOTAbout NOT FULLy cOVERINg bUccAL FIELd WHEN cLOSEd; IScHIUM SHORTER THAN SUbOVATE MERUS; EXOPOd STRAIgHT, TIP REAcHINg TO dISTAL MARgIN OF MERUS, FLAgELLUM LONg, ANTEROMESIAL MARgIN WITH ONE TUbERcLE ( FIg. 2C, D View Figure ). CHELIPEdS ELONgATE, SUbEqUAL ( IN MALE) TO EqUAL ( IN FEMALE); MERUS LONg, UNARMEd; cARPUS SUbOVATE; PROPOdUS SLIgHTLy ( IN FEMALE) TO MOdERATELy ( IN MALE) INFLATEd, LOWER SURFAcES SMOOTH WITH IRREgULAR MESH-LIkE PATTERN, MARgINS WITH ROWS OF SETAE; dAcTyLUS LONgER THAN PALM, OUTER ANd INNER SURFAcES WITH ScATTEREd PUbEScENcE, dENSER ALONg MARgINS, cUTTINg EdgES OF FINgERS WITH 4 LARgE TEETH, SEVERAL MINUTE TEETH dISTALLy ANd ONE SMALL TOOTH PROXIMALLy, NARROW gAP PRESENT AT bASE OF FINgERS WHEN FULLy cLOSEd ( FIg. 2E, F View Figure ). AMbULATORy LEgS SLENdER ( FIg. 1A View Figure ); INNER ANd OUTER SURFAcES WITH SEVERAL ScATTEREd LONg SETAE; dISTOdORSAL MARgIN OF IScHIUM WITH ONE SMALL TUbERcLE ( FIg. 3A View Figure ); dORSAL ANd VENTRAL MARgINS OF IScHIUM, MERUS, cARPUS ANd PROPOdUS LINEd WITH NUMEROUS VERy SHORT cURVEd SETAE, WITH MANy ScATTEREd LONgER SETAE; dISTOdORSAL MARgIN OF MERUS ANd cARPUS WITH A SMALL TUFTAbout TUFT OF SHORT SETAE; dAcTyLUS LATERALLy FLATTEN, FALcATE, UNARMEd, SHARPLy TAPERINg dISTALLy, LATERAL SURFAcES (EXcEPT FORAbout FOR dISTAL PART) WITH FEW ScATTEREd LONg SETAE, dORSAL ANd VENTRAL MARgINS WITH ONE ROW OF MEdIUM SETAE ANd SEVERAL ScATTEREd LONg SETAE, dISTAL PART gENTLy cURVEd, SURFAcES ANd MARgINS WITHOUT SETAE ( FIg. 3B View Figure ). PLEON SUbTRIANgULAR IN MALE, OVATE IN MATURE FEMALE, SURFAcE WITH ScATTEREd SETAE, dENSER ALONg MARgINS; MALE PLEONAL SOMITE 1 SLIgHTLy LONgER ANd NARROWER THAN SOMITE 2, SOMITES 3–5 FUSEd, FUSEd SOMITES cONSTITUTINg AbOUT 60% OF PLEON +PLEOTELSON LENgTH, PLEOTELSON TRAPEzOIdAL ( FIg. 3C View Figure ). G1 WITH STOUT bASE, SLIgHTLy bENT, UPcURVEd, TAPERINg gRAdUALLy INTO NARROW dISTAL ENd; AN S-SHAPEd gROOVE PRESENT ON INNER SURFAcE OF G1; MIddLE PORTION OF G1 WITH 2 SLENdER SETAE, SUbdISTAL PORTION OF G1 WITH 3 STOUT SETAE PROcESSES, MEdIAN ONE STRONgEST, LONgEST ( FIg. 3D, E View Figure ). FEMALE PLEON OVAL (RANgE OF L/W RATIO: 0.79–1.30), SOMITE 1 SLIgHTLy bROAdER THAN SOMITE 2 ANd AbOUT SAME LENgTH; SOMITES 3–5 FUSEd, WITH LATERAL SUTURES bARELy VISIbLE, cONSTITUTINg AbOUT 80% OF PLEON +PLEOTELSON LENgTH, PLEOTELSON SLIgHTLy cURVEd TOWARd PLEON, bROAd TRIANgULAR, LATERAL MARgINS SLIgHTLy cONcAVE ( FIg. 3F View Figure ); EggS LINEd AgAINST INNER SURFAcE OF PLEON ANd INdIVIdUALLy kEPT IN SOckETS ( FIg. 3G View Figure ).

Etymology. THE SPEcIES IS dEdIcATEd TO THE MEMORy OF MR. CHIAbout CHI PO-LIN (27 DEcEMbER 1964 – 10 JUNE 2017) AERIAL PHOTOgRAPHER ANd dOcUMENTARy FILM dIREcTOR WHO MAdE AN IMMENSE cONTRIbUTION TO ENVIRONMENTAL PROTEcTION IN TAIWAN.

Distribution. ONLy kNOWN FROM THE TyPE LOcALITy.

Remarks. OF THE 10 SPEcIES OF Neorhynchoplax  HAVINg UNARMEd AMbULATORy dAcTyLI, FIVE HAVE A TOOTH ON THE POSTEROLATERAL MARgINS OF THE cARAPAcE AS IN N. chipolini  sp. nov. THESE ARE N. attenuipes  , N. falcifera  , N. sinensis  , N. tuberculata  , ANd N. venusta  ( KEMP 1917: 258, FIg. 6; CHOPRA & DASAbout DAS 1930: 423, TEXT-FIg. 10; SHEN 1932: 59, TEXT- FIg. 33; DAI & YANg 1991: 117, FIg. 60; TAkEdA & MIyAkE 1971: 158, FIg. 1A View Figure ; PRETzMANN 1975: 607, PL. 1, FIgS 1 View Figure , 2 View Figure ; LUcAS 1980: 240, FIg. 3I View Figure ; LUcAS & DAVIE 1982: 404, FIg. 1 View Figure ; NARUSE et al. 2008: 439, FIg. 7A; Ng 2015: 195, FIgS 1A View Figure , 2A View Figure ).

Neorhynchoplax falcifera  , HOWEVER, dIFFERS FROM N. chipolini  sp. nov. IN HAVINg THE MEdIAN ANd LATERAL FRONTAL LObES UPTURNEd ( FIg. 1A, B View Figure ) (versus LATERAL LObES dIREcTEd ANTERIORLy WITH THE MEdIAN TOOTH bENT dOWNWARdS) ( NARUSE et al. 2008: 439, FIg. 7b).

Neorhynchoplax attenuipes  ANd N. tuberculata  bOTH POSSESS dISTINcT TUbERcLES ON THE gASTRIc ANd cARdIAc REgIONS OF THE cARAPAcE ( CHOPRA & DASAbout DAS 1930: 420, 423, TEXT-FIgS. 6, 7, 10), A FEATURE AbSENT IN N. chipolini  sp. nov. ( FIgS. 1A View Figure , 2A, B View Figure ).

Neorhynchoplax sinensis  FROM MAINLANd CHINA HASAbout HAS A HORIzONTALLy PROTRUdEd MEdIAN ROSTRAL TOOTH ANd THE cERVIcAL gROOVES ARE cOMPLETELy cONNEcTEd ON THE ANTERIOR cARAPAcE ( SHEN 1932: 59, TEXT-FIg. 33), WHEREAS N. chipolini  sp. nov., HASAbout HAS THE MEdIAN ROSTRAL TOOTH bENT dOWNWARdS ANd cERVIcAL gROOVES NOTAbout NOT cONNEcTEd ON THE ANTERIOR cARAPAcE ( FIg. 1A, B View Figure ). UNLIkE N. chipolini  sp. nov., N. sinensis  HASAbout HAS NO TUbERcLE ON THE INNER ANTEROLATERAL MARgIN OF THE FIRST EXOPOd ARTIcLE OF THE THIRd MAXILLIPEdS ( NARUSE, PERS. cOMM.; FIg. 2C, D View Figure ). MOREOVER, N. chipolini  sp. nov. HASAbout HAS 2 SETAE IN THE MIddLE PART OF THE G1 ( FIg. 3D, E View Figure ), bUT THAT OF N. sinensis  IS bARE ( SHEN 1932: 61, TEXT-FIg. 36b).

Neorhynchoplax chipolini  sp. nov. IS SIMILAR TO N. venusta  , dEScRIbEd FROM SINgAPORE, IN THE PRESENcE OF A TRIdENTATE ROSTRUM, THE PRESENcE OF A POSTEROLATERAL cARAPAcE TOOTH dIREcTLy AbOVE THE bASE OF SEcONd AMbULATORy LEg ANd WITH ELONgATE AMbULATORy LEgS. Neorhynchoplax chipolini  sp. nov., HOWEVER, HASAbout HAS SMOOTH ANTEROLATERAL MARgINS OF THE cARAPAcE ( FIgS. 1A View Figure , 2A View Figure ) (versus WITH A SMALL TOOTH IN N. venusta  ; Ng 2015: 193, FIg. 2A View Figure ); A MEdIAN ROSTRAL TOOTH THAT IS STyLIFORM ANd dISTINcTLy bENT dOWNWARdS ( FIg. 1A, B View Figure ) (versus SPATULIFORM, bROAdEST AbOUT HALFWAy ALONg ITS LENgTH ANd bROAdLy ROUNdEd APIcALLy IN N. venusta  ; Ng 2015: 193, FIg. 2A View Figure ); ANd THE ANTERO-MESIAL MARgIN OF THE EXOPOd OF THE THIRd MAXILLIPEd HASAbout HAS ONE TUbERcLE ( FIg. 2C, D View Figure ) (versus SMOOTH ANd UNARMEd IN N. venusta  ; Ng 2015: 195, FIg. 2B View Figure ).

Reproductive biology. LUcAS (1980) NOTEd THAT SEVERAL SPEcIES OF Neorhynchoplax  (AS Elamenopsis  ) HAVE EggS SMALLER THAN 0.3 MM dIAMETER. THE EggS OF Neorhynchoplax chipolini  sp. nov. ARE LARgER (0.43±0.02 MM, N=6, PARATyPE NMNS7878-5), ALTHOUgH IT cARRIES AS MANy EggS (cARAPAcE WIdTH 4.3 MM, 76 EggS) IN ONE bROOd AS N. aspinifera  (cARAPAcE WIdTH 3.0 MM, 77 EggS) ( LUcAS 1980: 216). IT IS WORTH MENTIONINg THAT EggS OF N. chipolini  sp. nov., WHIcH ARE LINEd AgAINST THE INNER SURFAcE OF AbdOMEN, ARE INdIVIdUALLy kEPT IN SOckETS ( FIg. 3G View Figure ). THIS PROTEcTIVE STRUcTURE WAS ALSO ObSERVEd IN N. mangalis (Ng, 1988)  ANd N. yaeyamaensis  (cF. Ng & CHUANg 1996: 60, FIgS. 26A–E; NARUSE et al. 2005: 3, FIg 1E View Figure ). Ng et al. (1999) NOTIcEd FEMALES OF N. sinensis  cARRy LARgE EggS ANd SUggESTEd THEy MAy ALSO bE OVOVIVIPAROUS AS ARE FEMALES OF N. mangalis (Ng et al. 1999: 91)  .

Ecology. OF THE gENERA OF HyMENOSOMATIdAE  , Neorhynchoplax  APPEARS TO HAVE THE HIgHEST NUMbER OF SPEcIES ASSOcIATEd WITH FRESHWATER OR bRAckISH WATER HAbITATS. LUcAS (1980) REVIEWEd SPEcIES IN TEN gENERA ANd NOTEd Elamenopsis A. MILNE-EdWARdS  , 1873, TO HAVE THE HIgHEST NUMbER OF SPEcIES (11) INHAbITINg ENVIRONMENTS WITH LOW SALINITy. BUTAbout BUT 15 OF THE 17 VALId SPEcIES HAVE SINcE bEEN TRANSFERREd TO Neorhynchoplax  . THE 14 NEWAbout NEW MEMbERS dEScRIbEd SINcE 1980 cONFIRM LUcAS’S cONcLUSION. OF 33 cURRENTLy kNOWN SPEcIES OF Neorhynchoplax  , 28 HAVE bEEN REPORTEd FROM FRESHWATER ANd bRAckISH WATER HAbITATS. EXcEPTIONS ARE N. bai NARUSE, MENdOzA & Ng, 2008  , N. chipolini  sp. nov., N. falcifera  , N. okinawaensis  , N. sinensis  , ANd N. venusta  , WHIcH HAVE SO FARAbout FAR ONLy bEEN FOUNd IN MARINE HAbITATS ( TAbLE 1).

RIM

L'Ecole d'Agriculture

NOT

Nottingham City Natural History Museum

TUFT

Tufts University

FOR

Forssa Museum of Natural History

CHI

University of Illinois

DAS

Agriculture and Agri-Food Canada

HAS

Funda��o Zoobot�nica do Rio Grande do Sul

BUT

Butler University

NEW

University of Newcastle

FAR

Kharazmi University

Kingdom

Animalia

Phylum

Arthropoda

Class

Malacostraca

Order

Decapoda

Family

Hymenosomatidae

Genus

Neorhynchoplax

Loc

Neorhynchoplax chipolini

Hsueh, Pan-Wen 2018

2018
Loc

N. chipolini

Hsueh 2018

2018
Loc

N. chipolini

Hsueh 2018

2018
Loc

N. chipolini

Hsueh 2018

2018
Loc

Neorhynchoplax chipolini

Hsueh 2018

2018
Loc

Neorhynchoplax chipolini

Hsueh 2018

2018
Loc

N. venusta

Ng 2015

2015
Loc

N. venusta

Ng 2015

2015
Loc

N. venusta

Ng 2015

2015
Loc

N. venusta

Ng 2015

2015