a new terrestrial amphipod (crustacea, amphipoda, talitridae ...lobe subquadrate; apical spine teeth...

24 25 SOLENODON No.8, 2009

pero en la especie de Tabasco el propeltidio presenta solo dos pares de sedas dorsales y el flagelo del macho es mucho más lanceolado, entre otros caracteres.

Las espermatecas de S. tepezcuintle sp. nov. recuerdan un poco a las de Stenochrus sp. 8, pero en esta los lóbulos laterales no presentan ensanchamiento basal ni están curvadas hacia afuera (compárese la Fig. 1 A con la Fig. 81 de Rowland y Reddell, 1980:31).

Tipos. Hembra holotipo (CNAN), MÉXICO, Cerro Tepezcuintle, municipio San Miguel Soyaltepec, distrito Tuxtepec, región Papaloapam, estado Oaxaca, 26,vii.2007, col. J. A. Cruz López, bajo piedras y troncos en descomposición. Paratipos: dos machos (ITVO), un macho (IES), un macho (CNAN), dos hembras (ITVO), una hembra (IES), iguales datos que el holotipo.

Distribución. Solo se conoce de la localidad tipo.Etimología. Nombre en aposición, referido a la localidad tipo de la especie.Nota. Aunque es habitual que se seleccione al macho como holotipo de las especies de

esquizómidos, en este caso se ha elegido a la hembra porque sus espermatecas difieren notablemente de las de S. moisii, que es la especie geográficamente más próxima y cuyos machos son casi indistinguibles de los de S. tepezcuintle sp. nov.

Agradecimientos.- Al profesor Eliézer Martín Frías (México, D. F.) por su amable mediación en el envío de los especímenes. A Rolando Teruel (BIOECO, Santiago de Cuba) por la revisión del manuscrito. A los árbitros anónimos que contribuyeron a mejorar la presentación final del documento.

REFERENCIAS

Harvey, M. S. 2003. Catalogue of the smaller arachnid orders of the World: Amblypygi, Uropygi, Schizomida, Palpigradi, Ricinulei and Solifugae. CSIRO Publishing. Collingwood Victoria, Australia. 385 pp.

Reddell, J. R. and J. C. Cokendolpher. 1995. Catalogue, bibliography, and generic revision of the order Schizomida (Arachnida). Texas Memorial Museum, Speleological Monographs 4:1–170.

Rowland, J. M. y Reddell, J. R. 1977. A review of the cavernicole Schizomida (Arachnida) of Mexico, Guatemala, and Belize. Association for Mexican Cave Studies Bulletin 6:79–102.

Rowland, J. M. y Reddell, J. R. 1980. The order Schizomida (Arachnida) in the New World. II. mexicanus and pecki groups (Schizomidae: Schizomus). Journal of Arachnology 8:1–34.

SOLENODON 8 -32, 2009:25

A new terrestrial amphipod (Crustacea, Amphipoda, Talitridae) from the Dominican Republic

Manuel ORTÍZ y Rogelio LALANA

Centro de Investigaciones Marinas, Universidad de La HabanaCalle 16, No. 114 e/ 1ra. y 3ra. Miramar, Playa, Ciudad de La Habana, Cuba

[email protected]

ABSTRACT. A new species, Caribitroides genaroi (Crustacea, Amphipoda, Talitridae), from a montane region of Dominican Republic is described. The main differences between C. genaroi sp. nov. and other congeneric species, previously known from the Caribbean Islands and Central America, are also provided in tabular format.

Key words: Amphipoda, Talitridae, Caribitroides, new species, Dominican Republic, Hispaniola.

RESUMEN. Se describe una especie nueva, Caribitroides genaroi sp. nov. (Crustacea, Amphipoda, Talitridae) proveniente de una zona montañosa de la República Dominicana Se señalan las principales diferencias entre la especie nueva y las otras congenericas, conocidas de las isla del Caribe y América Central.

Palabras clave: Amphipoda, Talitridae, Caribitroides, especie nueva, República Dominicana, Hispaniola.

INTRODUCTION

Members of genus Caribitroides Bousfield, 1984 (Crustacea, Amphipoda, Talitridae) are one of the few groups of amphipod crustaceans that have achieved some degree of success at the terrestrial environment, by living in the rain and cloud forests of the Caribbean islands and Central America. Members of this genus typically inhabit the forest leaf litter (Lindeman, 1990)When Bousfield (1984) briefly described the genus based on specimens from Jamaica, he (?) also wrote that several undescribed species are represented by specimen material from Jamaica and elsewhere (Lindeman, 1990). Caribitroides is presumably related to a more northern group of extant supralittoral simply-dactylate talitrids whose members are specialized to live in estuaries and salt marshes and which subsequently and gradually invaded the terrestrial altitudinal montane levels during climatic changes of the Oligocene. e. At least one terrestrial Caribitroides has been reported from higher elevations in Haiti, but it has not yet been fully described and illustrated (Caribitroides haitianus) (Bousfield & Poinar, 1994; 1995; Bousfield, personal communication (2007).

The aim of present paper is to describe a new species . of Caribitroides collected in a montane habitat of the Dominican Republic.


SYSTEMATICCaribi t r o ides genar o i sp. nov.

(Figs. 1-3)

Diagnosis. Nonsexually dimorphic land hoppers of the cloud and rain forest South-Western montane region of Sierra de Bahoruco, Dominican Republic, characterized by the following: Body smooth. Eyes small ovoidal, not tending to dorsal contiguity; eyes diameter not longer than wide of peduncle article 4 of antenna 2. Antenna 1 short 1/3 long of article 4 on antenna 2; flagellum with fivearticles. Antenna 2 slender, not sexually dimorphic; flagellum as long as peduncle; Mandibular left lacinia movilis 4-dentate. Inner lobe, on maxilla 1 narrows, linear, with a few scattered fine setules proximally; outer lobe subquadrate, outer margin convex, palp vestige minutely elongate

thone segmented. Maxilliped palp short, stout, 4 article very small, conical and masked by terminal spines of article 3; outer plate slightly arcuate, with terminal pellucid lobe; inner lobe subquadrate; apical spine teeth large, sharp. Inner lobe on lower lip vestigial. Coxae 2-4 posteriorly notched. Dactyls of pereopods 3-4 without cusps. Gnathopod 1 not sexually dimorphic, simple, lacking palm on article 6, lacking pellucid lobes. Gnathopod 2 not sexually dimorphic, article 2 slightly expanded proximally; article 3 elongate; articles 4-6 bearing posterior not pellucid lobes; article 6 shorter than 5; minutely subchelate, mittenlike; distal lobe non pellucid and long, extending well beyond dactyl; dactyl very small, with hooked tip. Pereopods 5-7 weakly heteropodous; pereopod 5 much shorter than 6 and 7. Pleopods 1-3 slender, peduncle slightly curved, naked; rami sub equals, shorter than peduncle (1/3 or less length of peduncle) pleopod 3, the shortest. Uropod 1 peduncle long; interramal spine large; outer ramus with spines. Uropod 2 rami equals, truncate at tip; uropod 3 short, two times wide than base of ramus; with one spine on peduncle. Telson short, quadrangular, with posterolateral and apicoterminal spines.

Diagnosis (en Español). Anfípodo terrestre sin dimorfismo sexual del bosque húmedo de la región sur occidental de la sierra de Bahoruco, República Dominicana, caracterizado por: Cuerpo liso. Ojos pequeños y ovoidales, sin tendencia a contigüidad dorsal, diámetro no más largo que el ancho del artejo 4 de la antena 2. Antena 1 corta, 1/3 del largo del artejo 4 de la antena 2; flagelo, con cinco artejos. Antena 2 estrecha, no sexualmente dimórfica; flagelo del largo del pedúnculo. Mandíbula izquierda con 4 dientes en la lámina móvil. Lóbulo interno de la maxila 1 estrecho, en línea con algunas setas finas proximales no muy separadas; lóbulo externo subcuadrado, margen externo convexo; palpo vestigial algo alargado, de un solo artejo. Palpo del maxilípedo corto y grueso; artejo 4 muy corto, cónico y enmascarado por las espinas terminales del artejo 3; lóbulo externo ligeramente arqueado, con un lóbulo terminal pelúcido; lóbulo interno subcuadrado; diente apical espinoso grande y afilado. Lóbulo interno del labio inferior vestigial. Coxas 2-4 con escotadura posterior. Dactilos de los pereiópodos 3-4 sin cúspides. Gnatópodo 1 no sexualmente dimórfico, simple, sin palma en el artejo 6, sin lóbulos pelúcidos. Gnatópodo 2 no sexualmente dimórfico, artejo 2 ligeramente expandido en su extremo proximal; artejo 3 alargado, artejos 4-6 con el lóbulo posterior no pelúcido; artejo 6 más corto que el 5; con subquela diminuta, en forma de manopla; lóbulo distal no pelúcido y alargado, extendido más allá del dactilo; dactilo muy pequeño, con punta curvada. Pereiópodos 5-7 poco diferentes; pereiópodo 5 mucho más corto que

Fig. 1. Caribitroides genaroi sp. nov., female: A, lateral view of animal; B, Maxilliped; C, maxilla 1; D,, upper lip; E, left mandibule; F, right mandibule; G, maxilla 2; H, lower lip: I, gill 1: J, gill 2: K, gill 3; L, gill 4; M, gill 5.

ORTÍZ y LALANA: New terrestrial amphipod from Dominican Republic

A

B C

D

G

FE

H

JI K L

M


el 6 y 7. Pleópodos 1-3 delgados; pedúnculo algo curvado; desnudo, ramas subiguales, más cortas que el pedúnculo (1/3 o menos del largo del pedúnculo) pleópodo 3 el más corto. Urópodo 1 con pedúnculo largo; espina interramal larga; rama externa con espinas. Urópodo 2 con ramas iguales, truncado en su extremo distal; urópodo 3 corto, dos veces el ancho de la base de cada rama, con una espina en el pedúnculo. Telson corto, cuadrangular, con espinas posterolaterales y apicales terminales.

Description of holotype. Antenna 2, article 5 slightly longer than 4; flagellum of 20 articles (Fig. 1A)

Buccal mass directed forward. Maxilliped inner plate scarcely setose; without serrulate distal spines; with two apical spine teeth; median margin naked; palp article 4 minute; inner lobe on article 2 small (Fig. 1B); maxilla 1 outer lobe bearing nine serrate distal setae; inner lobe with two distal plumose setae (Fig. 1C); lower lip rounded and covered with tiny setae on medial margin (Fig. 1D); mandibles incisive with three teeth; left mandibule, lacinia mobilis with four teeth; with three accessory setae (Fig. 1E); right mandibule, lacinia mobilis with three teeth; two accessory setae (Fig. 1F); inner lobe on maxilla 2 narrower than outer, with one facial setae midway on its inner border; both lobes bearing apical setae (Fig. 1G); lower lip bearing a tiny but complete inner lobe (Fig. 1 H); Coxae 1-2 with some small ventral setae; coxa 4 notched on anterior border. Gnathopod 1 article 2 anterior margin with 3 setae; posterior naked; article 5 wider than 6; article 6 with distal setae on anterior border: posterior completely covered with setae (Fig. 2A); gnathopod 2 article 2 sinuous, anterior margin armed with six short setae; posterior naked; article 6 as long as 5; outer face with a row of 15 setae on an almost right line; inner naked (Fig. 2B); pereopod 3 longer than 4; article 6 posterior margin naked; rest similar to pereopod 4 (Figs. 2C-D); pereopod 5 article 2 being narrowed distally; article 4 with small anterodistal lobe (Fig. 2E); pereopod 6 article 2 anterior and posterior margin sub parallel; with a discrete posterodistal lobe; article 4 forming a small anterodistal lobe; article 6 longer than 5 (Fig. 2F); article 2 of pereopod 7 ovoidal, with a very small posterior lobe; article 4 not forming anterodistal lobe; article 6 longer than 5 (Fig. 2G). Pleopod 1 with hooked coupling spines; pleopods 1-3 rami equals in length (Figs. 3E, F and G; rami articles not clearly shown; pleopod 3 the shortest. Uropod 1 peduncle with two pairs of dorsal spines; interramal spine present; inner ramus with 4 dorsal and two distal spines; outer ramus with one long, and four short distal spines (Fig. 3H). Uropod 2 peduncle with 3 dorsal spines; inner ramus with two dorsal and 3 distal spines; outer ramus with two dorsal and one long and one short spines (Fig. 3I). Uropod 3 peduncle with one spine; ramus shorter than peduncle; with two terminal spines (Fig. 3J); epimerum 2 without posterior setae, epimerum 3 forming one tooth on ventral corner; with 2 small posterior setae (Fig. 3K); telson with parallel lateral borders (Fig. 2I). Oostegite 1 with three distal setae: oostegite 2 with more than five setae; oostegite 3 with three setae; oostegite 4 with two sets of two setae. Gills large, flap-like; gill 1 with two small secondary lobes (Figs. 1I, 1J, 1K, 1L, 1M). Male: Similar than female. Article 5 of gnathopod 1 longer than that of female (Figs. 3L, M and N) show first gill and gnathopods 1-2 of male.

Types. Holotype. Female 13 mm; Las Abejas, Sierra de Bahoruco, DOMINICAN REPUBLIC; 1314 m over sea level; 8.xii.2005; J. A. Genaro coll.; deposited at the

Fig. 2 Caribitroides genaroi sp. nov., female: A, Gnathopod 1; B, Gnathopod 2; C, pereopod 3; D, pereopod 4; E, pereopod 5; F, pereopod 6; G, pereopod 7; H, lateral view of uropod 3 and telson: I, telson.


E

D

FG

H I

AB

C

30 31SOLENODON No 8, 2009

Crustacean Collection of the Centre for Marine Research, University of Havana. Paratypes. Female, 12 mm; female 11 mm; male 12 mm; female 10 mm; female 13 mm partially broken; ovigerous female (four eggs) 11 mm; female, 9 mm; female 13 mm; female 12 mm; female 11 mm; collected and deposited together with the holotype.

Etymology. Named in honor of our friend and entomologist Dr. Julio A. Genaro, who loaned the material for the present study.

Remarks. At present only two terrestrial amphipod species are known from Hispaniola; one undescribed species (Bousfield 1994, 1995, pers. comm.) from Haiti, and C. genaroi sp. nov. from the Dominican Republic. In addition, a fossil record from amber, Tethorchestia palaeorchestes Bousfield & Poinar 1995, is known.

C. genaroi sp. nov. has been collected only in the montane area of Las Abejas, Sierra de Bahoruco, Dominican Republic. No other amphipod species is known from this area. The main differences among C. genaroi sp. nov. and all other Caribbean Islands known species in the genus are given in Table 1.

Acknowledgements-. We want to express our warm gratitude to Dr. E. L. Bousfield for his advice and the shipment of literature including some original unpublished figures, without which this work could not have been concluded successfully. We also thank members of the 2005 Dominican Republic expedition for providing specimens: G. Alayón, J. A. Genaro, E. Gutiérrez and A. Pérez-Asso. One anonymous reviewer provided suggestions to the manuscript, to which we are thankful.

REFERENCES

Bousfield, E. L. 1984. Recent advances in the systematics and biogeography of landhoopers (Amphipoda, Talitridae) of the Indo-Pacific region. In Biogeography of the Tropical Pacific. (F. J. Radovsky, P. H. Raven and S. H. Sohmer, (editors) Bishop Museum Special. Publications 72: 171-210.

Bousfield, E. L. and G. O. Poinar, 1994. A new terrestrial amphipod from Tertiary amber deposits of Chiapas Province, Southern Mexico. Historical Biology 7: 105-114.

Bousfield, E. L. and G. O. Poinar, 1995. New terrestrial amphipod from Tertiary amber deposits of the Dominican Republic. Journal. Crustacean. Biology. 15 (4): 746-755.

Lindeman, D. 1990. New terrestrial amphipods (Crustacea: Amphipoda: Talitridae) from Mexico and Central America. Canadian J. Zool., 68: 2323-2337.

Fig. 3 Caribitroides genaroi sp. nov., female: A, oostegite 1; B, oostegite 2; C, oostegite 3; D, oostegite 4; E, pleopod 1; F, pleopod 2; G, pleopod 3; H, uropod 1; I, uropod 2; J, uropod 3; K, epimera 2-3; male: L, gill 1; M, gill 2; N, Gill 3.


A B C D

E F

G

H

I

J

K

L

M

N

32

Tab

le 1

. Mai

n d

iffe

ren

ces

bet

wee

n C

. gen

aroi

sp.

nov

. an

d co

nge

ner

ic s

pec

ies

fro

m th

e C

arib

bea

n a

nd

Cen

tral

Am

eric

an re

gio

n.

Car

ibitr

oide

s sp

ecie

s P

alp

max

. 1

G-2

art

icle

6

Ple

op

ods

Uro

po

d 3

T

elso

n

Ep

imer

um 3

D

istr

ibut

ion

Car

ibitr

oide

s tux

lens

is

Lin

dem

an, 1

990

Car

ibitr

oide

s.

new

toni

L

indem

an, 1

990

Car

ibitr

oide

s ja

mai

cens

is

Bo

usfi

eld, 1

989

Min

utel

y o

ne

segm

ente

d

----

----

----

- M

inut

ely

on

e se

gmen

ted

Wit

h p

ost

erio

r

wea

kly

pel

luci

d lo

be

Wit

h p

ost

erio

r p

ellu

cid lo

be

Wit

h p

ost

erio

r p

ellu

cid lo

be

Ram

i ap

pro

xim

atel

y eq

ual l

engt

h t

han

p

edun

cles

*

Ram

i ap

pro

xim

atel

y eq

ual l

engt

h t

han

p

edun

cles

R

ami

app

roxi

mat

ely

equa

l len

gth

th

an

ped

uncl

es

Bas

e o

f p

edun

cle

wid

e B

ase

of

ped

uncl

e w

ide

Bas

e o

f p

edun

cle

wid

e

Sho

rt, t

rian

gula

r,

wit

h d

ors

al

spin

es

Sho

rt, t

rian

gula

r,

wit

h d

ors

al

spin

es

Sho

rt, t

rian

gula

r,

wit

h d

ors

al

spin

es

Wit

h o

ne

or

two

p

ost

erio

r se

tae

Wit

h o

ne

or

two

p

ost

erio

r se

tae

Wit

h o

ne

or

two

p

ost

erio

r se

tae

Mex

ico

M

exic

o

Jam

aica

Car

ibitr

oide

s

pec

ki

L

indem

an, 1

990

Car

ibitr

oide

s ch

iape

nsis

L

indem

an, 1

990

Min

utel

y tw

o

segm

ente

d

----

----

----

Wit

h p

ost

erio

r p

ellu

cid lo

be

Wit

h p

ost

erio

r p

ellu

cid lo

be

Ram

i equ

al t

o o

r lo

nge

r th

an

ped

uncl

es

Ram

i ap

pro

xim

atel

y eq

ual l

engt

h t

han

p

edun

cles

Bas

e o

f p

edun

cle

wid

e --

----

----

-

Sho

rt, t

rian

gula

r,

wit

h d

ors

al

spin

es

Tri

angu

lar,

a

littl

e lo

nge

r th

an

wid

e

Wit

h t

hre

e o

r fo

ur p

ost

erio

r se

tae

Wit

h t

hre

e p

ost

erio

r se

tae

Mex

ico

M

exic

o

Car

ibitr

oide

s sp

. sen

su

Bo

usfi

eld

(19

94-9

5)

Min

utel

y o

ne

segm

ente

d

Wit

h p

ost

erio

r w

eakl

y p

ellu

cid

lob

e

Ram

i ap

pro

xim

atel

y eq

ual l

engt

h t

han

p

edun

cles

Bas

e o

f p

edun

cle

wid

e

Sho

rt, t

rian

gula

r,

wit

h d

ors

al

spin

es

Wit

h o

ne

p

ost

erio

r se

tae

Hai

ti

C. g

enar

oi

sp. n

ov.

Min

utel

y o

ne

segm

ente

d

Wit

h p

ost

erio

r n

o p

ellu

cid lo

be

R

ami 1

/3

len

gth

of

ped

uncl

e **

Bas

e o

f p

edun

cle

nar

row

Sho

rt

quad

ran

gula

r,

wit

ho

ut d

ors

al

spin

es

Wit

h t

wo

p

ost

erio

r se

tae

Do

min

ican

R

epub

lic

*

Exc

ept u

rop

od

3 **

Th

e p

edun

cle

and

ram

i of

the

thre

e p

leo

po

ds (r

ami 1

/3 le

ngt

h o

f p

edun

cle)

as

wel

l as

the

quad

ran

gula

r tel

son

are

exc

lusi

ve c

on

diti

on

s

of

C. g

enar

oi s

p. n

ov.

SOLENODON No 8, 2009

Página 1Página 2Página 3Página 4Página 5Página 6Página 7Página 8Página 9Página 10Página 11Página 12Página 13Página 14Página 15Página 16Página 17Página 18Página 19Página 20Página 21Página 22Página 23Página 24Página 25Página 26Página 27Página 28Página 29Página 30Página 31Página 32

a new terrestrial amphipod (crustacea, amphipoda, talitridae ...lobe subquadrate; apical spine teeth...

Documents